Full Stack Developer

🏢 Summary: Senior Java Backend Engineer role focused on designing and developing scalable microservices and REST APIs within a large-scale loyalty platform used across multiple European markets. The position involves building highly available backend services, contributing to architecture decisions, and ensuring high code quality in a cloud-based environment. The role also includes collaboration in Agile teams and technical mentoring of other developers. 🗂️ Requirements: Minimum 5 years commercial experience in Java backend development, Strong knowledge of Java 17+, Strong experience with Spring ecosystem (Spring Boot, Spring Data, Security, Web/WebFlux, Integration), Experience designing and implementing RESTful APIs, Hands-on experience with microservices architecture, Experience with PostgreSQL, Experience with NoSQL databases (CosmosDB), Experience with asynchronous communication patterns (queues/topics), Experience with CI/CD pipelines, Experience with Docker and Kubernetes, Strong knowledge of Gradle 8+, Experience working in Microsoft Azure cloud, Knowledge of clean code principles and design patterns, Experience working in Agile (Scrum), Fluent English (B2/C1) 📃 Skills: Java, Spring, SpringBoot, SpringData, SpringSecurity, WebFlux, REST, Microservices, PostgreSQL, NoSQL, CosmosDB, Azure, CI/CD, GitHubActions, AzurePipelines, Jenkins, Docker, Kubernetes, Gradle, Scrum 🏢 Description: Circle K Business Centre Warsaw is a shared service center supporting Circle K Europe across IT, Finance, Human Resources, Customer Service and other business areas. Circle K is part of Alimentation Couche-Tard Inc., one of the world’s largest convenience retail companies, operating globally across North America, Europe, Asia and the Middle East, with over 12,300 locations worldwide. Our continuously growing development organization (300+ IT professionals) delivers large‑scale software solutions used daily by millions of customers across Europe and North America. About the Team Loyalty Crafters is a backend engineering team responsible for key components of Circle K’s loyalty platform, including EXTRA 2.0. The team develops scalable backend services powering loyalty programs, personalized offers, campaigns, and rewards across multiple European markets. Key Responsibilities Design and develop backend services within Circle K’s loyalty ecosystem Build and maintain scalable, highly available microservices Develop and evolve REST APIs used by mobile and web applications Contribute to architectural and technical decisions Ensure high code quality through reviews and best engineering practices Mentor and support less experienced developers Collaborate with Product Owners, QA Engineers, Architects and other teams Required Skills and Experience At least 5 years of commercial experience in Java backend development Strong knowledge of Java (17+) and Spring ecosystem (Spring Boot, Spring Data, Security, Web/WebFlux, Integration) Experience in designing and implementing RESTful APIs Hands-on experience with microservices architecture Experience with relational databases, especially PostgreSQL Experience with non-relational/NoSql databases like Azure CosmosDB Experience with asynchronous communication patterns (queues/topics), Experience with CI/CD pipelines like GitHub Actions, Azure Pipelines or Jenkins Experience with Docker and Kubernetes Strong knowledge of Gradle 8+ Experience working in cloud environments (Microsoft Azure) Knowledge of clean code principles and software design patterns Experience working in Agile environments (Scrum) Fluent English (B2/C1) Nice to Have Experience with event-driven architectures (e.g. Kafka) Understanding of how AI‑based tools and solutions can support software development and product features Knowledge of Domain-Driven Design (DDD) Knowledge of Test-Driven-Develop (TDD) Experience with observability and monitoring tools Experience in loyalty, e-commerce or large-scale consumer platforms Technical leadership or mentoring experience What do we offer: Contract of employment Annual bonus Private medical care Cafeteria Platform/Multisport English lessons subsidized by the company Group insurance Attractive discounts for products and services at our stations Employee stock purchase plan Employee Assistance Program (Lyra) Modern and convenient office that you can virtually visit here - https://goo.gl/maps/CLteHfYcdYMbdESq6 Trainings & possibility to develop skills in a wide international environment When working with us you can depend upon it that you will not be judged on the grounds of race, national origin, gender, sexual orientation, disability, age, or other legally protected status. Oppositely – we believe that our diverse and inclusive culture helps us create an amazing atmosphere where everybody feels welcome. Check who we are here: https://youtu.be/td-QGnNnvW0 Want to know even more about us? Take a look at our career page: https://workwithus.circlek.com/global/en/businesscentrewarsaw Interested? We encourage you to apply. We know great companies are built from within, by great people like you. Come grow with us!We´re looking forward to your application. We hereby inform that in the company Circle K Business Centre Poland sp. z o.o. with registered office in Warsaw an Internal Notification and Follow-up Actions Procedures applies. The document describes rules for reporting violations of law by whistleblowers. Full content of the above-mentioned Procedure is available here: https://www.circlek.pl/o-nas/procedury-zgloszen

🏢 Summary: The role involves designing and implementing scalable, cloud-native integration solutions connecting diverse enterprise systems across global operations. You will develop and maintain microservices-based integrations using Java and Python, leveraging Kubernetes, Docker, and Oracle Cloud services. The position covers the full integration lifecycle from requirements analysis to deployment and support. 🗂️ Requirements: Bachelor’s degree in Computer Science, Information Technology or related field, Proven experience as Integration Developer or similar role, Strong experience with Kubernetes and microservices architecture, Strong programming skills in Java and Python, Experience with Spring Boot, REST, SOAP and Camel, Hands-on experience with Docker and container orchestration, Experience with CI/CD tools and version control systems, Understanding of network protocols and security principles, Knowledge of cloud infrastructure 📃 Skills: Java, Python, SpringBoot, REST, SOAP, Camel, Kubernetes, Docker, Microservices, OracleCloud, Git, Jenkins, CICD, Networking, Security, Cloud 🏢 Description: We are looking for Developer in Integrations Development team to be part of our team which is responsible (but not limited to) for developing and maintaining integrations between various applications company is using to run the business. Our role is to be part of whole lifecycle of the implementing of such integrations - from helping business process owners to realize idea, setting up requirements, development, production deployment, handover to support lines up to benefits realization of what our work has contributed. As a retail business company with long history, many support offices and thousands of stores around the globe it is not a surprise that application and technology portfolio is fairly wide - from top-new digital platforms to large ERP accounting systems, from presence in public clouds, using newest beta services to on-site server based CRM applications. Our talent is to fulfill any demand if it gives value disregard how different the applications we are integrating might be. We are looking for you if you are ready for such challenges which in the end are making work and life more interesting and engaging! Responsibilities Design and implement highly scalable, resilient, and performant cloud-native integration solutions. Create and manage containerized applications using Docker and Kubernetes, ensuring seamless deployment and orchestration. Write clean, maintainable, and efficient code to build integration services. Develop integration flows and APIs using a mix of custom code in Java and Python, and Oracle Cloud native services. Ensure that integrations are designed with scalability, reliability, and fault tolerance in mind. Collaborate with cross-functional teams to understand business requirements and translate them into technical specifications. Proactively identify and resolve any issues related to the performance and reliability of integrations. Advocate for and implement best practices in cloud architecture, Kubernetes management, integration design, and coding. Ensure all solutions adhere to enterprise security policies and compliance requirements. Document all processes, designs, and deployments meticulously for future reference and for the use of other team members. Work closely with other developers, architects, and product teams to deliver end-to-end solutions. Provide technical guidance and support to other team members. Participate in code reviews, team meetings, and knowledge-sharing sessions. Requirements Bachelor’s degree in computer science, Information Technology, or a related field. Proven experience as an Integration Developer or similar role, with a focus on Kubernetes and microservices architecture. Strong programming skills and experience in languages such as Java, Python, Spring Boot, REST, SOAP, Camel. In-depth knowledge of Kubernetes, Docker, and related container orchestration and management technologies. Familiarity with CI/CD tools and version control systems (e.g., Git, Jenkins). Solid understanding of network protocols, security principles, and cloud infrastructure. Excellent problem-solving abilities and a strong attention to detail. Nice to have Understanding of retail business processes. Experience with public clouds. Experience in test automation for unit and integration testing. What do we offer? Contract of employment Annual bonus Private medical care Cafeteria Platform/Multisport English lessons subsidized by the company Group insurance Attractive discounts for products and services at our stations Employee stock purchase plan Employee Assistance Program (Lyra) Modern and convenient office that you can virtually visit here - https://goo.gl/maps/CLteHfYcdYMbdESq6 Trainings & possibility to develop skills in a wide international environment When working with us you can depend upon it that you will not be judged on the grounds of race, national origin, gender, sexual orientation, disability, age, or other legally protected status. Oppositely – we believe that our diverse and inclusive culture helps us create an amazing atmosphere where everybody feels welcome.  Check who we are here: https://youtu.be/td-QGnNnvW0 Want to know even more about us? Interested? We encourage you to apply. We know great companies are built from within, by great people like you. Come grow with us! We´re looking forward to your application We hereby inform that in the company Circle K Business Centre Poland sp. z o.o. with registered office in Warsaw an Internal Notification and Follow-up Actions Procedures applies. The document describes rules for reporting violations of law by whistleblowers. Full content of the above-mentioned Procedure is available here: https://www.circlek.pl/o-nas/procedury-zgloszen

🏢 Summary: Long-term B2B opportunity for a Senior Java Developer to modernize and develop a large-scale CRM platform, focusing on migrating a legacy JBoss monolith to a Spring Boot-based domain-driven architecture. The role involves backend development, system modernization, database migration, and collaboration within cross-functional teams. Work is delivered in a hybrid model within an established development department. 🗂️ Requirements: Commercial experience with Java 21+, Experience with REST API development, Strong knowledge of Spring and Spring Boot, Experience with unit and integration testing (Mockito, Testcontainers, JUnit 5), Proficiency with Git, Experience using Swagger, Ability to work with IntelliJ, Experience with JBoss or JEE5, Knowledge of SQL (Postgres or Sybase), English level B2/C1 📃 Skills: Java, REST, Spring, SpringBoot, JUnit, Mockito, Testcontainers, Git, Swagger, IntelliJ, JBoss, JEE, SQL, Postgres, Sybase, React, Kubernetes, Jenkins, JBPM, Swing, JavaFX 🏢 Description: Client: A leading German telecommunications and IT corporation Start date: ASAP Locations: Warszawa, Poznań, Lublin Work model: hybrid with 3 days/week from the office Engagement: Long-term Form of cooperation: B2B, full-time Working hours: Standard business hours About our client: A leading German telecommunications and IT corporation, recognized for innovative solutions in cloud computing, web hosting, and internet services, is expanding its European Technology Center in Poland. The company is building strong development teams in Warsaw, Poznan, and Lublin to support its long-term digital transformation initiatives. About the project & team: You will join an established development team consisting of three experienced Java developers and one test manager. This team is part of a larger department that includes over 20 developers across several cross‑functional teams. The department is responsible for the company’s core CRM platform, which includes multiple frontends (Java Swing, JavaFX, React) and numerous backend services built in technologies such as JBoss 4/7, WildFly 10, Spring Boot, and Spring Batch. The primary focus of your future team is the modernization of the CRM system, including the migration of business logic from a legacy monolithic JBoss 4 application to a modern, domain‑driven architecture using Spring Boot. Future development includes building new React-based frontends, enhancing backend services, and modernizing database layers (e.g., Sybase migrations). You will work within a stable, collaborative setup, contributing to high-impact solutions used across the organization. Must‑have skills: Java >21 REST Spring / Spring Boot Unit- and Integrations-Tests (Mockito, Testcontainers, JUnit 5) Git Swagger IntelliJ Nice to have skills: Kubernetes JEE5 (JBOSS) SQL (Optimal: Postgres, Sybase) Java Swing or JavaFX JBPM Jenkins (CI/CD) English Level: B2/C1 Responsibilities: Develop and maintain backend services within a large CRM platform. Migrate business logic from a monolithic JBoss 4 system to Spring Boot microservices. Participate in building new frontends (React) and extending backend functionalities. Contribute to database modernization, including migration of Sybase logic. Collaborate closely with developers and the team’s test manager. Ensure high code quality through unit and integration testing. Use best practices in CI/CD, version control, and modern development standards. What We Offer: Competitive compensation: up to 120 PLN/h netto on a B2B contract Flexible settlements: Payments issued in your preferred form Fast invoicing: Short 14‑day payment terms Comprehensive healthcare: Extended private medical care package My Benefit platform: Access to a cafeteria system including Multisport cards and prepaid vouchers (e.g., IKEA, Zalando, Notino, and more)

🏢 Summary: Full-stack Developer role focused on building scalable, microservices-based applications using Java 21 and Spring Boot, with involvement across backend, frontend, testing, CI/CD, and cloud-native deployment. The position involves developing RESTful APIs, ensuring code quality, and deploying containerized solutions in a modern DevOps environment. The offer targets experienced engineers capable of delivering complex software solutions in international projects. 🗂️ Requirements: Minimum 4 years of hands-on experience in Java development, Strong experience with Spring and Spring Boot, Experience building RESTful APIs and microservices, Working knowledge of at least one frontend framework (preferably React), Proficiency with Git version control, Experience with SQL and NoSQL databases, Experience with Maven for build and dependency management, Experience with unit testing using JUnit and Mockito, Experience with Docker or Kubernetes, Experience working with CI/CD pipelines and Jenkins, Fluent English 📃 Skills: Java, Spring, SpringBoot, React, REST, Microservices, JUnit, Mockito, Wiremock, SonarQube, Docker, Kubernetes, ELK, BitBucket, Maven, Jenkins, Git, SQL, NoSQL 🏢 Description: At Jacobs, we're embarking on an exciting journey as we initiate the development of our Digital & Data Hub in the heart of Krakow. Our mission is to undertake projects spanning various industries, including Consumer and Manufacturing, Defence and Security, Energy and Utilities, Financial Services, Government and Public Services, Health and Life Sciences, and Transport. We are seeking a Full-stack Developer with expertise spanning various aspects of software development, including Java OOPS concepts, Java 21 features, web applications, REST services, testing frameworks, and more. The ideal candidate will have a proven track record of successful project implementation. Key Responsibilities: Apply object‑oriented programming principles in Java to deliver scalable and maintainable solutions Work with Java 21, making use of streams, functional interfaces, and collections for cleaner code Build microservices with Spring Boot and related frameworks, ensuring modular and efficient system design Develop RESTful APIs following industry best practices for implementation and consumption Write unit and integration tests using JUnit, Wiremock, and Mockito to ensure reliability and coverage Maintain high code quality through automated checks with SonarQube Deploy and orchestrate applications using Docker and Kubernetes Set up monitoring and logging with the ELK stack to support observability and troubleshooting Navigate CI/CD pipelines with BitBucket, Maven, and Jenkins to streamline delivery Contribute to team standards by conducting thorough code reviews Here's what you'll need: Minimum 4 years of hands-on experience in Java development Strong background in Spring and Spring Boot frameworks Working knowledge of front‑end technologies and at least one framework (preferably React ) Proficient in version control systems, especially Git Solid understanding of both SQL and NoSQL databases Experience with build and dependency management tools, particularly Maven Skilled in unit testing, particularly with JUnit and Mockito Proven ability to design and deliver complex software solutions Experience using Google Cloud Platform (GCP) in day‑to‑day software development Familiarity with containerization and orchestration tools like Docker or Kubernetes Experience working in a consulting environment, including collaboration with multiple stakeholders and clients Familiarity CI/CD pipelines and related tooling (Jenkins, Kubernetes, etc.) Strong analytical thinking and problem-solving capabilities Excellent communication and teamwork skills Fluent in English We offer: Rewarding employment - full-time employment with a salary that matches your qualifications Hybrid work model - enjoy the flexibility of working mostly from home Flexible hours - start your day anytime between 7:30 and 10:00 AM Comprehensive benefits, including Lux Med medical care, psychological support, life insurance, My Benefit cafeteria system, Multisport card co-financing, and a car/bike park sharing system Co-financed holidays - enjoy "Wczasy pod Gruszą" for a well-deserved break Global projects - engage in exciting international projects Inclusive networks - join our diverse employee networks like Women's Network, OneWorld, PRISM, Careers Network, Green Team, SpeakUp, Collectively, and more Continuous learning - participate in our Graduate Development Program, Learners’ Community, and self-learning platforms Language courses - enhance your skills with courses in English, German, and Polish We know that if we are inclusive, we’re more connected, and we’re more creative.  We accept people for who they are.  Find out more about life at Jacobs .  As a Disability Confident employer, we will interview all disabled applicants who meet the criteria for a vacancy.  If you require further support or reasonable adjustments with regards to the recruitment process (for example, you require the application form in a different format), please contact the team recruitmentpoland@jacobs.com

🏢 Summary: Senior Software Engineer role focused on designing, developing, and supporting secure, scalable in-country applications, with strong emphasis on Java-based backend systems and collaboration with stakeholders in Kazakhstan. The position involves full lifecycle development, application security, CI/CD practices, and troubleshooting complex distributed systems. The role requires close coordination with vendors and regulators while ensuring high-quality, extensible software architecture. 🗂️ Requirements: Fluent Russian and English, 8+ years of experience in software engineering, Experience in systems analysis and software programming, Experience managing and implementing software projects, Strong knowledge of Java 8+ and Spring framework ecosystem, Experience with RESTful services and Microservices architecture, Experience with MSSQL and Oracle databases, Experience with messaging systems, Experience with distributed caching solutions, Knowledge of CI/CD practices, Experience working with Linux and Windows environments 📃 Skills: Java, Spring, SpringBoot, SpringMVC, SpringSecurity, REST, Microservices, MSSQL, Oracle, Redis, Hazelcast, Kafka, ActiveMQ, Tibco, IBMMQ, Linux, RHEL, Windows, Jenkins, Maven, BitBucket, Git, uDeploy, JIRA, ETL 🏢 Description: We are seeking a highly skilled and experienced Software Engineer to join our team, providing critical support for our in-country local applications in Kazakhstan. This role requires a strong technical background in software development and excellent communication skills to collaborate with local vendors, regulators, and user teams. What you’ll do Research, design, implement, and manage software programs, coordinating with stakeholders to ensure extensible low-level design with appropriate separation of concerns and abstractions. Write modular, extensible, readable, performant, and secured code, actively participating in code reviews. Prioritize application security by adhering to secure design architecture and established security standards and practices. Create technical solution artifacts, code review records, and deployment plans. Troubleshoot and resolve complex cross-component issues, including those identified during static analysis, penetration testing, or deployment, by identifying root causes and implementing effective solutions. Apply advanced language constructs, design principles, design patterns, libraries, frameworks, appropriate data structures, and performance/scalability concepts. What we’ll need from you Language Requirement: Fluent Russian and English to effectively communicate with local vendors, regulators, and user teams in Kazakhstan. Essential Skills & Experience: 8+ years of relevant experience in engineering software applications or products. Proven experience in systems analysis and programming of software applications. Demonstrated success in managing and implementing software projects. Working knowledge of consulting and project management techniques/methods. Ability to work effectively under pressure and manage deadlines, as well as adapt to unexpected changes in expectations or requirements. Conversant with Continuous Integration/Continuous Delivery (CI/CD) practices. Technical Skills: Languages & Frameworks: Java 8+, Spring Boot, Spring Core, Spring MVC, Spring Security, REST, Microservices. Databases: Experience with MSSQL & Oracle. Distributed Cache: Redis/Hazelcast. Messaging: Kafka/Active MQ, Tibco EMS, IBM MQ. Operating Systems: Linux RHEL, Windows. Tools: Familiarity with data pipeline and ETL technologies. Development Tools: Knowledge of JIRA, CI/CD tools like Jenkins, Maven, BitBucket, Git, and uDeploy. What we can offer you By joining Citi Solutions Center Poland, you will not only be part of a business casual workplace with a hybrid working model (currently up to 2 days working at home per week), but also (potentially, subject to final offer) receive a competitive base salary and enjoy a whole host of additional benefits which can include: Employer paid Defined Contribution Pension Plan contribution of 6% of employee’s pensionable earnings (PPE Program) Employer paid Private Medical Care Package for employees and Private Medical Care Packages for certain family members available at preferential rates Employer paid Life Insurance Program for employees and Life Insurance for certain family members available at preferential rates Employee Assistance Program financed by Employer Paid Parental Leave Program (maternity and paternity leave; statutory and 2 weeks additional paid paternity leave) Sport Card for employees subsidised via Social Benefits Fund and Sport Cards for certain family members available at preferential rates Additional benefits from Company’s Social Benefit Fund, in particular: Holidays Allowance, support for sport and cultural activities, team building events. Additional day off for volunteering Cafeteria/ flex benefit – a company benefits system which enables employees to select and purchase benefits offered by a provider and available for employees on the platform. Opportunity to receive an annual discretionary incentive award Special offers and discounts for employees Copy and paste the URL below into a new tab on your web browser to view the Remuneration Regulations extract: https://tbcdn.talentbrew.com/company/287/cms/v3/docs/policies/RemunerationRegulations-KeyProvisions-CitibankEurope_plc_05012025_A.pdf Alongside these benefits Citi is committed to ensuring our workplace is where everyone feels comfortable coming to work as their whole self every day. We want the best talent around the world to be energized to join us, motivated to stay, and empowered to thrive. Sounds like Citi has everything you need? Then apply to discover the true extent of your capabilities. Russian speaking candidate ------------------------------------------------------ Job Family Group: Technology ------------------------------------------------------ Job Family: Applications Development ------------------------------------------------------ Time Type: Full time ------------------------------------------------------ Primary Location Full Time Salary Range: 189 660,00 zł - 322 940,00 zł ------------------------------------------------------ Most Relevant Skills Please see the requirements listed above. ------------------------------------------------------ Other Relevant Skills For complementary skills, please see above and/or contact the recruiter. ------------------------------------------------------ Automated Processing and AI We use automated processing, including artificial intelligence, for our legitimate business interests (or our reasonable and appropriate business purposes) to identify and align the candidate's skills and abilities with a specific job opening. Additionally, if you so choose, or consent, we can match your skills and abilities to other suitable roles at Citi. Importantly, all our hiring processes and decisions, including determining your suitability for a role, are conducted, checked, and decided by individuals. Our automated processing and AI do not involve relying on automatic or autonomous decision-making. Please refer to any Jurisdictional Considerations, with specific provisions for your country (where relevant) for further details. ------------------------------------------------------ This job opening is for an existing job vacancy. ------------------------------------------------------ Citi is an equal opportunity employer, and qualified candidates will receive consideration without regard to their race, color, religion, sex, sexual orientation, gender identity, national origin, disability, status as a protected veteran, or any other characteristic protected by law. If you are a person with a disability and need a reasonable accommodation to use our search tools and/or apply for a career opportunity review Accessibility at Citi . View Citi’s EEO Policy Statement and the Know Your Rights poster.

🏢 Summary: IT Consultant/Developer role in a large-scale cards transformation programme for a leading Polish bank, focused on building and configuring high-performance payment integrations across POS, ATM, and e-commerce channels. The position involves developing reliable, scalable, and observable transactional systems using modern technologies within complex banking environments. Requires on-site work in Warsaw (3 days per week) and fluent Polish. 🗂️ Requirements: Experience delivering integration solutions in banking environments, Strong development experience with Java 17 and Spring Boot, Experience with Kafka, OpenShift, and PostgreSQL, Hands-on experience with ISO8583 messaging and payment integrations, Ability to build reliable transactional systems with consistency and idempotency, Experience with batch/ETL processes and data migrations, Understanding of CI/CD and containerization, Fluent Polish (spoken and written), Availability to work on-site in Warsaw 3 days per week 📃 Skills: Java, Spring, Kafka, OpenShift, PostgreSQL, ISO8583, ETL, CI/CD, Docker, Kubernetes 🏢 Description: Location: Warsaw, Poland Pref. work model - 3x per week from office At Capco Poland, we’re not just another consultancy - we’re the spark behind digital transformation in the financial world. As a global leader in technology and management consulting, we thrive on helping clients tackle the toughest challenges across banking, payments, capital markets, wealth, and asset management. Our secret? A culture that’s fast, flexible, and fiercely entrepreneurial. We move quickly, think creatively, and always put our people first. We’re passionate about growth - both for our clients and ourselves - and that means attracting the very best talent to join us on this exciting journey. We’re proud to be: • Trailblazers in banking, payments, capital markets, wealth, and asset management • Champions of an agile, nimble, and innovative work environment • Dedicated to building a team of top-notch professionals who share our drive and vision ROLE OVERVIEW Build high-performance payment integrations at the core of a major cards transformation The Role We are looking for an experienced IT Consultant/Developer to join a large-scale cards transformation programme for a leading Polish bank. You will design, build, and configure integrations across complex system landscapes, supporting transactional flows across POS, ATM, and e-commerce channels. This role focuses on delivering reliable, scalable, and observable solutions using modern technologies while ensuring consistency and resilience across interfaces. Fluency in Polish is mandatory. What You’ll Do Develop and configure integrations including ISO8583 adapters, POS/ATM handlers, and system interfaces Implement data mapping, transformations, validation rules, and error handling (retries, idempotency) Build and maintain batch/ETL processes, data migrations, and reconciliation tools Implement logging, monitoring, and observability aligned with engineering standards Support SIT/UAT phases by resolving defects and ensuring system stability and performance What We’re Looking For Experience delivering integration solutions in banking environments (POS/ATM/e-commerce and back-office systems) Strong development experience with Java (17), Spring Boot, Kafka, OpenShift, and PostgreSQL Proven ability to build reliable transactional systems with focus on consistency, idempotency, and observability Experience working with ISO8583 messaging and complex payment integrations Understanding of CI/CD, containerization, and modern development practices Bonus Points For Experience designing and implementing PostgreSQL data models (schemas, indexes, procedures) Experience supporting settlement processing, audit feeds, and reconciliation processes Familiarity with systems such as IPS, Visiona, INCAS, or ACI platforms (Interchange/Cardpack/Acquirer) Experience optimizing performance and ensuring data integrity across distributed systems Experience working in large-scale financial transformation programmes IMPORTANT Fluent Polish (spoken and written) – mandatory Good command of English for documentation and collaboration. Availability to work on-site, with partial remote work - 3 days per week from the office. ONLINE RECRUITMENT PROCESS STEPS Screening call with the Recruiter Hiring Manager Technical Interview Client stage Feedback/Offer We offer a flexible collaboration model based on a B2B contract, with the opportunity to work on diverse projects.

🏢 Summary: Senior Software Engineer role focused on designing, developing, and supporting in-country local applications in Kazakhstan, with strong emphasis on secure architecture, distributed systems, and stakeholder collaboration. The position involves full lifecycle development, cross-component troubleshooting, and adherence to CI/CD and security best practices. Requires extensive experience in .NET technologies, enterprise messaging, databases, and distributed environments. 🗂️ Requirements: Fluent Russian and English, 8+ years of experience in software engineering, Experience in systems analysis and software programming, Proven experience managing and implementing software projects, Knowledge of consulting and project management methodologies, Experience with CI/CD practices, Experience with .NET framework (C#.Net, ASP.Net), Experience with MSSQL and Oracle databases, Experience with distributed caching technologies, Experience with enterprise messaging systems, Experience working with Linux RHEL and Windows 📃 Skills: C#, ASP.NET, .NET, MSSQL, Oracle, Redis, Hazelcast, Kafka, ActiveMQ, Tibco, IBM, Linux, RHEL, Windows, JIRA, Jenkins, Maven, BitBucket, Git, uDeploy, ETL, CI/CD 🏢 Description: We are seeking a highly skilled and experienced Software Engineer to join our team, providing critical support for our in-country local applications in Kazakhstan. This role requires a strong technical background in software development and excellent communication skills to collaborate with local vendors, regulators, and user teams. What you’ll do Research, design, implement, and manage software programs, coordinating with stakeholders to ensure extensible low-level design with appropriate separation of concerns and abstractions. Write modular, extensible, readable, performant, and secured code, actively participating in code reviews. Prioritize application security by adhering to secure design architecture and established security standards and practices. Create technical solution artifacts, code review records, and deployment plans. Troubleshoot and resolve complex cross-component issues, including those identified during static analysis, penetration testing, or deployment, by identifying root causes and implementing effective solutions. Apply advanced language constructs, design principles, design patterns, libraries, frameworks, appropriate data structures, and performance/scalability concepts. What we’ll need from you Language Requirement: Fluent Russian and English to effectively communicate with local vendors, regulators, and user teams in Kazakhstan. Essential Skills & Experience: 8+ years of relevant experience in engineering software applications or products. Proven experience in systems analysis and programming of software applications. Demonstrated success in managing and implementing software projects. Working knowledge of consulting and project management techniques/methods. Ability to work effectively under pressure and manage deadlines, as well as adapt to unexpected changes in expectations or requirements. Conversant with Continuous Integration/Continuous Delivery (CI/CD) practices. Technical Skills: Languages & Frameworks: .Net framework experience, preferably C#.Net and ASP.net Databases: Experience with MSSQL & Oracle. Distributed Cache: Redis/Hazelcast. Messaging: Kafka/Active MQ, Tibco EMS, IBM MQ. Operating Systems: Linux RHEL, Windows. Tools: Familiarity with data pipeline and ETL technologies. Development Tools: Knowledge of JIRA, CI/CD tools like Jenkins, Maven, BitBucket, Git, and uDeploy. What we can offer you By joining Citi Solutions Center Poland, you will not only be part of a business casual workplace with a hybrid working model (currently up to 2 days working at home per week), but also (potentially, subject to final offer) receive a competitive base salary and enjoy a whole host of additional benefits which can include: Employer paid Defined Contribution Pension Plan contribution of 6% of employee’s pensionable earnings (PPE Program) Employer paid Private Medical Care Package for employees and Private Medical Care Packages for certain family members available at preferential rates Employer paid Life Insurance Program for employees and Life Insurance for certain family members available at preferential rates Employee Assistance Program financed by Employer Paid Parental Leave Program (maternity and paternity leave; statutory and 2 weeks additional paid paternity leave) Sport Card for employees subsidised via Social Benefits Fund and Sport Cards for certain family members available at preferential rates Additional benefits from Company’s Social Benefit Fund, in particular: Holidays Allowance, support for sport and cultural activities, team building events. Additional day off for volunteering Cafeteria/ flex benefit – a company benefits system which enables employees to select and purchase benefits offered by a provider and available for employees on the platform. Opportunity to receive an annual discretionary incentive award Special offers and discounts for employees Copy and paste the URL below into a new tab on your web browser to view the Remuneration Regulations extract: https://tbcdn.talentbrew.com/company/287/cms/v3/docs/policies/RemunerationRegulations-KeyProvisions-CitibankEurope_plc_05012025_A.pdf Alongside these benefits Citi is committed to ensuring our workplace is where everyone feels comfortable coming to work as their whole self every day. We want the best talent around the world to be energized to join us, motivated to stay, and empowered to thrive. Sounds like Citi has everything you need? Then apply to discover the true extent of your capabilities. #LI-NG4 Russian speaking candidate ------------------------------------------------------ Job Family Group: Technology ------------------------------------------------------ Job Family: Applications Development ------------------------------------------------------ Time Type: Full time ------------------------------------------------------ Primary Location Full Time Salary Range: 189 660,00 zł - 322 940,00 zł ------------------------------------------------------ Most Relevant Skills Please see the requirements listed above. ------------------------------------------------------ Other Relevant Skills For complementary skills, please see above and/or contact the recruiter. ------------------------------------------------------ Automated Processing and AI We use automated processing, including artificial intelligence, for our legitimate business interests (or our reasonable and appropriate business purposes) to identify and align the candidate's skills and abilities with a specific job opening. Additionally, if you so choose, or consent, we can match your skills and abilities to other suitable roles at Citi. Importantly, all our hiring processes and decisions, including determining your suitability for a role, are conducted, checked, and decided by individuals. Our automated processing and AI do not involve relying on automatic or autonomous decision-making. Please refer to any Jurisdictional Considerations, with specific provisions for your country (where relevant) for further details. ------------------------------------------------------ This job opening is for an existing job vacancy. ------------------------------------------------------ Citi is an equal opportunity employer, and qualified candidates will receive consideration without regard to their race, color, religion, sex, sexual orientation, gender identity, national origin, disability, status as a protected veteran, or any other characteristic protected by law. If you are a person with a disability and need a reasonable accommodation to use our search tools and/or apply for a career opportunity review Accessibility at Citi . View Citi’s EEO Policy Statement and the Know Your Rights poster.

🏢 Summary: Senior Android Developer role focused on building and scaling a Kotlin-based POS mobile application within a SuperApp, contributing to a Kotlin Multiplatform strategy across Android and iOS. The position involves developing new features, improving app architecture, and ensuring high-quality, scalable solutions used globally. The role requires strong expertise in Android development, modern architectures, and testing practices. 🗂️ Requirements: 8+ years of experience in Android mobile development, Strong proficiency in Kotlin, Minimum 2 years of experience with Jetpack Compose, Experience with Kotlin Multiplatform, Knowledge of software design patterns (MVVM or MVI), Experience building modular and scalable app architectures, Experience with reactive programming using Flow and Coroutines, Strong knowledge of testing best practices and writing automated tests 📃 Skills: Kotlin, Android, Jetpack, Compose, KMP, MVVM, MVI, Flow, Coroutines, Concurrency, Testing 🏢 Description: About the team SumUp’s Point-of-Sale (POS) solution empowers cafes, shops, bars, hair salons, and other businesses to operate efficiently and grow. It offers a wide range of features, including product catalogs, inventory management, business analytics, compliance support, and loyalty tools. Our POS solution integrates seamlessly into the SumUp SuperApp, which supports both our proprietary register hardware and mobile devices like tablets and phones. As a Senior Android Developer , you’ll collaborate with a dynamic, cross-functional team of Product Managers, Product Designers, Engineering Managers, and fellow engineers. About the role We’re evolving toward a Kotlin Multiplatform (KMP) strategy, enabling shared development across Android and iOS. In this role, you’ll learn, refine, and help implement this technology, shaping the future of our mobile apps. You’re a developer who values user-centric design, precision, and seamless collaboration. You bring structure to communication and thrive in a cross-functional environment. This role will be a B2B based role in Warsaw. What you’ll do Build new features for the item catalog within the SumUp SuperApp Help improve the architecture of the application and contribute to our Kotlin Multiplatform strategy Enhance and maintain our unified android app, distributed across 60+ countries, ensuring high-quality, scalable solutions Shape the product’s evolution by identifying opportunities for improvement and contributing to daily decision-making Write thorough documentation and implement robust testing for features before shipping Collaborate closely with Designer, Product Manager and Android engineers to deliver a unified UX experience across platforms You’ll thrive in this role if: You have 8** + years experience in mobile engineering with Android and Kotlin.** You have 2+ years of experience working with Jetpack Compose. You have a solid understanding of software design patterns (e.g., MVVM, MVI) and expertise in building modular, scalable app architectures. You have good knowledge of reactive programming (Flow, Coroutines and Concurrency). You have a strong grasp of testing best practices: knowing what to test, why, and how to write resilient tests. You strive for clean code, and you are flexible to balance pragmatism and perfection. You have a keen interest in multi-platform development using Kotlin Multiplatform. Why You Should Join SumUp (Warsaw) 🇵🇱 🌎 Opportunity to work , from our vibrant Warsaw office with inspiring art-filled lounges and a skyline terrace in the Mennica Legacy Tower. 🌈 Commitment to Diversity and Inclusion: be part of a workplace that values and promotes diversity, fostering an inclusive environment where everyone's perspectives are respected and embraced 🚀 Enrolment onto our VSOP program: you will own a stake in SumUp’s future success 🚴 Fitness support: work out on-site at our gym or explore the city using the Multisport Card, subsidised by SumUp for access to sports facilities across Warsaw 🩺 Commitment to well-being: access health insurance coverage for you and your family, plus life insurance to further protect your peace of mind 💰 PPK (Employee Capital Plan): grow your savings with joint contributions from SumUp and the State. 🏖️ Generous time off: enjoy 26 days of paid leave plus public holidays and special leave days 🌴 Break4me: 1-month sabbatical after 3 years of service 🔗 Referral Bonus: earn additional rewards by referring talented individuals to join the SumUp team Job Application Tip We recognise that candidates feel they need to meet 100% of the job criteria in order to apply for a job. Please note that this is only a guide. If you don’t tick every box, it’s ok too because it means you have room to learn and develop your career at SumUp.

🏢 Summary: Senior Backend Engineer role focused on building secure backend systems to ensure fiscal compliance of POS products across multiple European markets. The position involves designing and implementing integrations for receipt fiscalization and regulatory reporting within a distributed, cross-functional environment. The role supports international expansion by developing scalable, fault-tolerant backend solutions. 🗂️ Requirements: 5+ years of backend engineering experience, Strong proficiency in Java and/or Kotlin, Solid understanding of system architecture and design principles, Experience with data modeling and API design, Experience building distributed and fault-tolerant systems, Hands-on experience with AWS, Hands-on experience with Kubernetes, Knowledge of Kafka, Knowledge of Postgres, Understanding of CQRS 📃 Skills: Java, Kotlin, AWS, Kubernetes, Kafka, Postgres, CQRS, APIs, Microservices, DistributedSystems 🏢 Description: About the team SumUp’s Point-of-Sale (POS) solution empowers cafes, shops, bars, hair salons, and other businesses to operate efficiently and grow. It offers a wide range of features, including product catalogs, inventory management, business analytics, compliance support, and loyalty tools. Our Fiscalization team will accelerate making the following countries fiscally compliant: Italy, Sweden, Norway, Belgium, Austria, and many other European countries. They will also start building the path for integrating with third parties and fiscalizing receipts. As a Senior Backend Engineer , you’ll collaborate with a dynamic, cross-functional team of Product Managers, Product Designers, Engineering Managers, and fellow engineers. About the role You will be working on secure backend systems to ensure our SumUp’s Point of Sale (POS) products are compliant in the different countries in our roadmap. Furthermore, you will work with the Fiscalization squad to understand the challenge in each market to design a unique solution to delivery. You’re a developer who values user-centric design, precision, and seamless collaboration. You bring structure to communication and thrive in a cross-functional environment. This will be B2B role for our team in Warsaw. What you’ll do Build and maintain fiscal compliance solutions to enable SumUp's expansion across Italy, Sweden, Norway, Belgium, Austria, and other European markets. Develop integrations with third-party services for receipt fiscalization and regulatory reporting systems. Navigate SumUp's complex POS ecosystem and master fiscalization frameworks across multiple jurisdictions. Collaborate with distributed squad members and stakeholders across 5+ cities in a hybrid environment. You’ll thrive in this role if: You have 5+ years experience in backend engineering with Java and/or Kotlin. You have a strong understanding of fundamental system architecture, design principles, data modeling, and API design. You have a strong experience with distributed and fault-tolerant systems. You have user-level experience working with AWS and Kubernetes. You have good knowledge of Kafka, Postgres, & CQRS. Why You Should Join SumUp (Warsaw) 🇵🇱 🌈 Commitment to Diversity and Inclusion: be part of a workplace that values and promotes diversity, fostering an inclusive environment where everyone's perspectives are respected and embraced 🚀 Enrolment onto our VSOP program: you will own a stake in SumUp’s future success 🚴 Fitness support: work out on-site at our gym or explore the city using the Multisport Card, subsidised by SumUp for access to sports facilities across Warsaw 🩺 Commitment to well-being: access health insurance coverage for you and your family, plus life insurance to further protect your peace of mind 💰 PPK (Employee Capital Plan): grow your savings with joint contributions from SumUp and the State. 🏖️ Generous time off: enjoy 26 days of paid leave plus public holidays and special leave days 🌴 Break4me: 1-month sabbatical after 3 years of service 🔗 Referral Bonus: earn additional rewards by referring talented individuals to join the SumUp team Job Application Tip We recognise that candidates feel they need to meet 100% of the job criteria in order to apply for a job. Please note that this is only a guide. If you don’t tick every box, it’s ok too because it means you have room to learn and develop your career at SumUp.

🏢 Summary: Mid-level engineering role focused on developing and supporting Java and React-based microservices for a global payments platform, enabling secure and high-volume fund transfers. The position involves modernizing legacy systems into API-driven architectures and enhancing automation and transaction processing. Hybrid work model with strong emphasis on scalable, reliable financial systems. 🗂️ Requirements: Minimum 4 years of software development experience, Strong experience with Java 11+, Commercial experience with ReactJS, Experience building RESTful microservices and APIs, Hands-on experience with Kubernetes, Experience with Git, Experience with Unix-based systems, Strong knowledge of SQL and Oracle databases, Fluent English, Legal right to work in the European Union 📃 Skills: Java, ReactJS, Microservices, REST, API, Kubernetes, Git, Unix, SQL, Oracle, Spring, SpringBoot, JavaScript, WebSphere, Automation, DevOps 🏢 Description: Unleash innovation — shape the future of digital payments Krakow-based opportunity with hybrid work model (up to 3 remote days per week) As a Mid-Level Java & React Microservices Engineer – Payments Platform , you will be working for our client, a leading provider in the financial technology industry. You will contribute to the development and support of the Global Disbursements platform, enabling customers worldwide to move funds rapidly and securely—fueling seamless global transactions, paying suppliers, allocating salaries, settling taxes, and transferring money across multiple channels. Join us and be part of a transformative journey in modern payments technology, fostering innovation and growth in your career. Your main responsibilities: Building and supporting microservices and applications (both front-end and back-end) using Java 11/17/21 and ReactJS, ensuring high-quality standards and reliability. Migrating from mainframe systems and IBM WebSphere to modern API and microservices architectures to reduce costs and complexity. Implementing automation testing frameworks to decrease testing costs and increase efficiency. Enhancing Straight-Through Processing (STP) capabilities of services to streamline transaction flows. You're ideal for this role if you have: Minimum of 4 years of experience in software development, particularly in Java and React environments. Proficiency with Java 11+, preferably Java 17+. Hands-on experience with Kubernetes, Git, and Unix-based systems. Strong knowledge of database technologies and SQL, especially Oracle. Solid understanding of RESTful microservices and APIs. Experience working within a DevOps delivery team is a plus. Familiarity with application monitoring and Spring/Spring Boot is desirable. It is a strong plus if you have: Certifications or experience in automation testing frameworks. Knowledge of Web technologies and JavaScript. Language Required for the role: Fluent English Eligibility for the role: Only candidates with an existing legal right to work in the European Union will be considered for this role. We offer you: ITDS Business Consultants is involved in various, innovative, and professional IT projects for international companies in the financial industry in Europe. We offer an environment for professional, ambitious, and driven people. The offer includes: Stable and long-term cooperation with very good conditions Enhance your skills and develop your expertise in the financial industry Work on the most strategic projects available in the market Define your career roadmap and develop yourself in the best and fastest possible way by delivering strategic projects for different clients of ITDS over several years Participation in Social Events, training, and work in an international environment Access to an attractive Medical Package Access to Multisport Program #GETREADY Internal job ID #8860 You can report violations in accordance with ITDS’s Whistleblower Procedure available here .