Senior Software Engineer (Java)

🏢 Summary: Development role focused on building and maintaining a modern microservices-based payment processing platform in a high-volume environment. The position involves designing, implementing, and supporting Java-based services, ensuring scalability, reliability, and performance. Work is done in a hybrid model with strong emphasis on quality, testing, and production support. 🗂️ Requirements: Minimum 3 years of experience in similar role, Strong Java development experience, Knowledge of Spring Boot, Understanding of microservices architecture, Understanding of distributed systems, Experience with API design, Experience with at least some of the listed technologies, Ability to perform unit testing and code reviews, Fluent English 📃 Skills: Java, Spring, SpringBoot, Microservices, Kubernetes, OpenShift, Kafka, RabbitMQ, MongoDB, Oracle, SQL, REST, Groovy, Maven, Jenkins, Jira, Confluence 🏢 Description: About the Project Our client is a European payments organization undergoing a major digital transformation focused on modernizing its core transaction‑processing platform. The team is building a modern microservices‑based environment designed to increase scalability, reliability, and performance across high‑volume payment operations. Technology stack in use: Java 21 (Spring Boot 3), OpenShift / Kubernetes, Apache Kafka / Rabbit MQ for streaming and queuing, MongoDB, Oracle Database, multiple DevOps tools for development, automation and monitoring. Work mode: hybrid, 3-4 per week from Cracow office Key Responsibilities: ·       Design, develop and support testing payment services features together with the team. ·       Resolve issues by troubleshooting and root cause analysis and support in production issue analysis when needed. ·       Ensure high quality via unit testing and code reviews. ·       Demo and document the results of work in demo sessions. Required Experience & Skills: ·       At least 3 years on similar position ·       Technical knowledge in at least some of the technologies used is needed. ·       Java development skills are the most relevant. ·       Understanding of microservices architecture and distributed systems. ·       Familiarity with API design principles. ·       Fluent English Additional Valuable Skills: ·       Experience in designing and implementing high-throughput, low-latency systems capable of handling large data volumes ·       Groovy, Maven, Jenkins ·       Knowledge of the Card Processing domain ·       Documentation and use of Jira/Confluence ·       Excellent communication and coordination skills We offer Ongoing support from a dedicated agent who is caring about your project continuity, contact with clients, necessary formalities, work comfort, and development. Career Development Program – advice on career planning based on the latest trends and market needs in IT, including consultations with career agents and mentors. Access to 7N Learning & Development – a development and educational platform offering webinars, a library of articles and industry reports, and frequent invitations to both one-time and recurring events focused on technical, business, and lifestyle topics. Spectacular events, both for you (e.g., annual Kick-Off trip , Christmas parties, or Summer Olympics sports events) and for your loved ones (e.g. family picnics), Professional growth Professional growth beyond your current project. You can actively engage in knowledge sharing through the 7N Services offering, designed for 7N clients. Connections and access to the expertise of top IT professionals in the market – the average professional tenure of our consultants in Poland is over 10 years, A complete benefits package, including funding for medical care, life insurance, sports cards for you and your loved ones, as well as discounts in stores in Poland and abroad

🏢 Summary: The role involves designing and developing scalable backend systems in a microservices architecture using Java or Kotlin and Spring. The engineer will influence technical decisions while building payment and subscription platforms with event-driven communication and cloud-based solutions. The position includes working with modern architectural patterns and ensuring high code quality through testing and reviews. 🗂️ Requirements: Strong experience with Java and/or Kotlin, Solid knowledge of Spring and Spring Boot, Hands-on experience with SQL and relational databases, Experience with PostgreSQL, Proven experience with microservices architecture, Experience with event-driven systems, Practical experience with JUnit, Mockito, Testcontainers, Experience with AWS or GCP, Understanding of DDD, CQRS, Hexagonal Architecture, Experience with payment or subscription systems 📃 Skills: Java, Kotlin, Spring, SpringBoot, SQL, PostgreSQL, Microservices, Kafka, JUnit, Mockito, Testcontainers, AWS, GCP, DDD, CQRS, HexagonalArchitecture 🏢 Description: Senior Backend Engineer (Java/Kotlin) We are looking for an experienced Backend Engineer to join a team building modern, scalable systems based on a microservices architecture. This role offers real influence over technical decisions, system architecture, and the quality of delivered solutions—particularly within payment and subscription platforms. Responsibilities Design, develop, and maintain backend systems using Java or Kotlin and the Spring Framework Build and evolve microservices following DDD , CQRS , and Hexagonal Architecture principles Implement event-driven communication , ideally using Apache Kafka Work with relational databases ( PostgreSQL or other SQL databases ) and optimize queries Write unit and integration tests using JUnit, Mockito, and Testcontainers Contribute to the design and development of cloud-based solutions ( AWS or GCP ) Participate in code reviews and drive high engineering standards Collaborate closely with product and engineering teams to deliver business-critical features Requirements Strong experience with Java and/or Kotlin Solid knowledge of Spring / Spring Boot Hands-on experience with SQL and relational databases (preferably PostgreSQL ) Proven background in microservices-based architectures Experience with event-driven systems (Kafka is a strong plus) Practical experience with backend testing (JUnit, Mockito, Testcontainers) Experience working with cloud platforms ( AWS or GCP ) Good understanding of Domain-Driven Design (DDD) , CQRS , and Hexagonal Architecture Must-have: experience with payment systems and/or subscription-based platforms Nice to Have Experience working with high-scale, high-availability systems Knowledge of security and transactional data handling Background in product-driven, Agile environments

🏢 Summary: Senior-level Java engineering role focused on building a secure, scalable, blockchain-based payment platform using modern cloud-native and microservices architecture. The position involves designing and developing high-quality backend services, event-driven systems, and APIs in a distributed environment. The role emphasizes architectural ownership, scalability, and production-grade system reliability. 🗂️ Requirements: 8+ years of commercial experience in Java development, Strong experience with Spring Boot, Experience designing distributed systems and microservices architecture, Hands-on experience with Kafka and/or Azure Event Hub, Production experience with GraphQL, Practical experience with Docker, Practical experience with Kubernetes, Experience delivering cloud-based scalable solutions, Strong knowledge of system design and integration patterns, Understanding of high-availability systems 📃 Skills: Java, Spring, SpringBoot, Kafka, Azure, EventHub, GraphQL, Docker, Kubernetes, Microservices, Blockchain, Cloud 🏢 Description: Lead Java Engineer We are looking for a highly experienced Java Engineer to join an advanced financial technology initiative focused on building a next-generation payment solution leveraging blockchain concepts. The project aims to create a secure, scalable, and enterprise-ready platform enabling seamless value transfers between financial entities. Role Responsibilities: Design and develop high-quality backend services using Java and Spring Boot Architect and enhance microservices-based systems Implement event-driven solutions using technologies such as Kafka and Azure Event Hub Design and expose APIs (including GraphQL) for efficient data exchange Work with containerized environments using Docker and Kubernetes Contribute to architectural decisions, scalability improvements, and performance optimization Ensure clean code standards, system reliability, and production readiness Requirements: 8+ years of commercial experience in Java development Strong background in Spring Boot and distributed systems architecture Hands-on experience with event streaming platforms (Kafka and/or Azure Event Hub) Experience with GraphQL in production environments Practical knowledge of containerization and orchestration (Docker, Kubernetes) Experience delivering cloud-based, scalable solutions Solid understanding of system design, integration patterns, and high-availability systems Opportunity to work on an innovative financial platform built with modern, cloud-native technologies.

🏢 Summary: Senior Java Developer role focused on building and optimizing high-performance transactional and banking systems in a 100% remote environment. The position involves designing scalable backend solutions using modern Java and Spring technologies, integrating messaging systems, and ensuring system reliability through advanced monitoring and CI/CD practices. This opportunity targets experienced engineers ready to contribute to complex financial platforms in an agile setting. 🗂️ Requirements: Minimum 5 years of Java development experience, Strong experience with Java 21+, Strong experience with Spring Boot 3, Solid knowledge of PostgreSQL, Experience with CI/CD tools (GitLab, Jenkins), Experience with OpenShift deployments, Experience with RabbitMQ and Kafka, Experience with ELK stack and Dynatrace, Experience with JUnit 5, Mockito, RestAssured, Experience working in Agile (Scrum, Kanban), Good command of Polish, Communicative English proficiency, Legal right to work in the European Union 📃 Skills: Java, Spring, PostgreSQL, Redis, RabbitMQ, Kafka, ELK, Dynatrace, GitLab, Jenkins, OpenShift, JUnit, Mockito, RestAssured, SQL, R 🏢 Description: Unleash innovation in financial technology — shape the future of transactional systems with expertise and precision! 100% remote work. As a Senior Java Developer , you will be working for our client, a leading player in the financial services industry dedicated to delivering cutting-edge transactional and banking systems. You will contribute to the development of robust, scalable solutions that power high-stakes online financial operations, driving digital transformation and operational excellence. This role offers a unique chance to advance your career within an innovative environment that values technical mastery and strategic thinking. Your main responsibilities: Design, develop, and optimize complex backend systems using Java 21+ and Spring Boot 3, adhering to best practices and high-quality standards. Work with domain-driven design (DDD) to implement scalable and maintainable software solutions. Manage and optimize data solutions utilizing PostgreSQL, Redis, and integration tools like RabbitMQ and Kafka. Utilize tools such as ELK stack, Dynatrace, and CI/CD pipelines (GitLab, Jenkins, OpenShift) to ensure system performance and reliability. Conduct thorough testing and validation using JUnit 5, Mockito, and RestAssured to deliver resilient software releases. Collaborate with agile teams (Scrum, Kanban) for iterative development and continuous improvement. Contribute analytical insights and high-level problem-solving skills to support transaction systems in a fast-paced financial environment. You're ideal for this role if you have: At least 5 years of experience in Java development, with a strong background in Spring Boot 3 and Java 21+. Solid understanding of database technologies, particularly PostgreSQL. Practical experience with CI/CD tools such as GitLab, Jenkins, and deployment on OpenShift. Familiarity with message brokers like RabbitMQ and Kafka. Knowledge of monitoring and logging tools (ELK stack, Dynatrace). Experience with automated testing frameworks including JUnit 5, Mockito, and RestAssured. Strong analytical skills and experience working within agile methodologies (Scrum, Kanban). It is a strong plus if you have: Experience in the finance sector and knowledge of financial risk modeling. Certifications related to cloud, database management, or software development. Basic knowledge of R language and SQL testing. Language required for the role: Polish (good command), English (communicative proficiency). Eligibility to work in Europe: Only candidates with an existing legal right to work within the European Union will be considered for this role.

🏢 Summary: Senior Java/Kafka Developer role focused on modernizing and enhancing payment systems by adapting legacy applications to ISO20022 financial messaging standards. The position involves designing, developing, and deploying high-impact changes within complex payment architectures using Java and Kafka technologies. Hybrid work model with strong emphasis on secure, scalable financial messaging solutions. 🗂️ Requirements: Minimum 5 years of professional experience in Java development, Strong expertise in Java, Spring, Hibernate, and DB2, Hands-on experience with Apache Kafka, Experience with Spring Boot and Spring Data, Experience in RESTful API development, Knowledge of microservices architecture, Experience with Docker, Proficiency with Git and CI/CD pipelines, Fluent Polish and English, Legal right to work in the European Union 📃 Skills: Java, Spring, SpringBoot, SpringData, Hibernate, DB2, Kafka, KafkaStreams, KafkaConnect, REST, Microservices, Docker, Git, GitLabCI, ISO20022 🏢 Description: Empower Financial Innovation - Redefine Payment Systems with Next-Gen Technology! Warszawa-based opportunity with hybrid work model (4 days per week in the office) As a Senior Java/Kafka Developer – Payments and Financial Messaging , you will be working for our client, a leader in the financial services industry, dedicated to transforming payment systems and implementing cutting-edge messaging standards. Join a dynamic team focused on adapting legacy applications to non-discretionary ISO20022 standards, enabling secure and efficient financial messaging worldwide. This role offers an exciting pathway for career growth within a forward-thinking organization committed to innovation. Your main responsibilities: Collaborate in requirements gathering sessions with business stakeholders to ensure technical solutions meet business needs Analyze, design, and plan impactful technical changes within complex payment systems Develop, test, and deploy modifications to legacy applications aligned with ISO20022 standards Conduct code reviews, support UAT processes, and assist with seamless code releases Apply creative problem-solving to improve the tech stack and optimize system performance Reverse engineer complex code bases to implement high-impact modifications effectively You're ideal for this role if you have: Minimum 5 years of professional experience in Java development Strong expertise in Java, Spring, Hibernate, and DB2 Experience with Spring Boot, dependency injection, auto-configuration, and Spring Data Hands-on knowledge of Apache Kafka (producers, consumers, Kafka Streams, Kafka Connect) Familiarity with RESTful API development, and microservices architectures Knowledge of containerization tools like Docker Proficiency with Git, CI/CD pipelines (preferably GitLab CI) It is a strong plus if you have: Past experience in financial services, banking technology, or payments industry is a plus Understanding of financial messaging standards such as ISO 20022, SWIFT, CBPR+ or FIN Experience with IBM MQ / JMS - queue managers and channels Infrastructure as Code expertise - provisioning and managing infrastructure Language Required for the role: Fluent Polish and English communication skills Eligibility for the role: Only candidates with an existing legal right to work in the European Union will be considered for this role #MAKEYourCareerBETTER Interested? Apply now and include your CV (preferably in English) along with a statement confirming your consent to the processing and storage of your personal data.

🏢 Summary: Senior Java Full Stack Developer role focused on building and supporting scalable banking applications within a global engineering team. The position involves developing microservices-based systems, ensuring production stability, and driving digital transformation in financial services. Hybrid work model with strong emphasis on DevOps, observability, and end-to-end support. 🗂️ Requirements: 6+ years of Java and full-stack development experience, Expertise in Java 21 and Spring Boot 3.x, Experience with microservices architecture and REST APIs, Strong knowledge of React JS, Experience with PostgreSQL, Experience with messaging systems (MQ or Solace), Familiarity with Kubernetes and Redis, Experience with CI/CD and DevOps practices, Knowledge of observability and monitoring tools, Fluent English, Legal right to work in the EU 📃 Skills: Java, Spring, SpringBoot, Microservices, REST, JSON, React, PostgreSQL, MQ, Solace, Kubernetes, Redis, Grafana, Splunk, Logstash, Prometheus, Jenkins, Ansible, CI/CD, DevOps 🏢 Description: Empower financial innovation — shape the future of banking technology! Krakow-based opportunity with hybrid work model allowing up to 3 remote days per week. As a Senior Java Full Stack Developer – Banking and Financial Services , you will be working for our client, a leading global bank, contributing to the development and support of critical financial applications. You will help build robust, scalable systems that drive digital transformation in the banking sector, offering innovative solutions to complex financial challenges. Your main responsibilities: Deliver application enhancements and provide ongoing support as a key member of a global engineering team. Collaborate with business stakeholders to plan, execute, and meet project milestones. Lead the resolution of critical incidents, ensuring timely fixes and issue resolution. Own end-to-end production support, managing support requests, tickets, and queries. Diagnose, troubleshoot, and resolve application performance, stability, and usability issues. Create and maintain technical documentation, best-practice guides, and process artifacts. Continuously develop your skills through training, certifications, and practical experience. Act as a subject matter expert for system functionality, operational constraints, and best practices. Participate actively in agile delivery, identifying risks and dependencies early. You're ideal for this role if you have: 6+ years of experience in Java development and full-stack engineering. Deep expertise with Java 21, Spring Boot 3.x, microservices, REST APIs, and JSON. Strong knowledge of React JS, PostgreSQL, and messaging systems like MQ or Solace. Working familiarity with Kubernetes, Redis, and application security best practices. Exposure to observability tools and DevOps/CI/CD pipelines: Grafana, Splunk, Logstash, Prometheus, Jenkins, Ansible. Excellent written and verbal communication skills in English. Ability to work effectively across distributed teams with responsiveness and ownership. Customer-focused mindset with a passion for high-quality deliverables. Comfortable operating within a DevOps model, supporting testing, analysis, and support tasks. It is a strong plus if you have: Basic Python, shell scripting, and experience with workflow engines like Activiti. Familiarity with testing frameworks such as JMock/Mockito and Selenium. Support or development experience with workflow-based applications. 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. #MAKEYourCareerBETTER Interested? Apply now and include your CV (preferably in English) along with a statement confirming your consent to the processing and storage of your personal data.

🏢 Summary: Senior Java/Kafka Developer role focused on modernizing and enhancing payment systems by adapting legacy applications to ISO20022 financial messaging standards. The position involves designing and implementing technical changes within complex payment environments and supporting secure, high-performance financial messaging solutions. Hybrid work model based in Warsaw. 🗂️ Requirements: Minimum 5 years of professional experience in Java development, Strong expertise in Java, Spring, Hibernate, and DB2, Experience with Spring Boot, dependency injection, auto-configuration, and Spring Data, Hands-on experience with Apache Kafka (producers, consumers, Kafka Streams, Kafka Connect), Experience in RESTful API development and microservices architecture, Knowledge of Docker containerization, Proficiency with Git and CI/CD pipelines (preferably GitLab CI), Fluent Polish and English language skills, Legal right to work in the European Union 📃 Skills: Java, Spring, Hibernate, DB2, SpringBoot, Kafka, KafkaStreams, KafkaConnect, REST, Microservices, Docker, Git, GitLabCI, ISO20022, SWIFT, CBPR+, FIN, IBMMQ, JMS, IaC 🏢 Description: Empower Financial Innovation - Redefine Payment Systems with Next-Gen Technology! Warszawa-based opportunity with hybrid work model (up to 2 remote days per week). As a Senior Java/Kafka Developer – Payments and Financial Messaging , you will be working for our client, a leader in the financial services industry, dedicated to transforming payment systems and implementing cutting-edge messaging standards. Join a dynamic team focused on adapting legacy applications to non-discretionary ISO20022 standards, enabling secure and efficient financial messaging worldwide. This role offers an exciting pathway for career growth within a forward-thinking organization committed to innovation. Your main responsibilities: Collaborate in requirements gathering sessions with business stakeholders to ensure technical solutions meet business needs Analyze, design, and plan impactful technical changes within complex payment systems Develop, test, and deploy modifications to legacy applications aligned with ISO20022 standards Conduct code reviews, support UAT processes, and assist with seamless code releases Apply creative problem-solving to improve the tech stack and optimize system performance Reverse engineer complex code bases to implement high-impact modifications effectively You're ideal for this role if you have: Minimum 5 years of professional experience in Java development Strong expertise in Java, Spring, Hibernate, and DB2 Experience with Spring Boot, dependency injection, auto-configuration, and Spring Data Hands-on knowledge of Apache Kafka (producers, consumers, Kafka Streams, Kafka Connect) Familiarity with RESTful API development, and microservices architectures Knowledge of containerization tools like Docker Proficiency with Git, CI/CD pipelines (preferably GitLab CI) It is a strong plus if you have: Past experience in financial services, banking technology, or payments industry is a plus Understanding of financial messaging standards such as ISO 20022, SWIFT, CBPR+ or FIN Experience with IBM MQ / JMS - queue managers and channels Infrastructure as Code expertise - provisioning and managing infrastructure Language Required for the role: Fluent Polish and English communication skills Eligibility for the role: Only candidates with an existing legal right to work in the European Union will be considered for this role #MAKEYourCareerBETTER Interested? Apply now and include your CV (preferably in English) along with a statement confirming your consent to the processing and storage of your personal data.

🏢 Summary: Junior Software Engineer role focused on developing and maintaining mission-critical backend components in the financial and payments domain. The position involves feature delivery, participation in release processes, and engagement in DevOps and SRE practices within a modern engineering environment. It offers structured growth while working with technologies such as Microservices, Kafka, and GenAI tools. 🗂️ Requirements: 0–2 years professional software development experience, Familiarity with Java, Understanding of Microservices architecture, Knowledge of messaging patterns, Basic knowledge of SDLC and production-ready code practices, Willingness to work in evolving greenfield environment, Ability to work in Agile team, Openness to learning new backend technologies 📃 Skills: Java, Microservices, Kafka, GenAI, DevOps, SRE, Agile, SDLC, AI, DataEngineering, Messaging 🏢 Description: Junior Software Engineer (Java) Salary: 70–85 PLN/h Work Model: Hybrid - 3 days per week from the Warsaw office Join our growing engineering team supporting a global leader in the financial and payments sector. As a trusted technology partner, we help organizations build and maintain mission-critical systems while embracing modern engineering practices. We’re looking for a proactive Junior Software Engineer (Java) who is eager to learn, grow, and contribute to impactful solutions within a high-standard engineering environment. What You’ll Do • Develop and deliver features within assigned components under guidance from senior engineers • Contribute to code quality, testing, and participate in the release process • Collaborate with cross-functional teams in an Agile environment • Support DevOps and Site Reliability Engineering (SRE) activities • Leverage modern tools, including GenAI, to enhance development efficiency • Continuously learn and adapt to new backend technologies and evolving project needs What You Bring • 1–2 years of experience in software development • Basic knowledge of Java and Microservices architecture • Familiarity with messaging systems (e.g., Kafka) is a plus • Understanding of the software development lifecycle and best practices for stable, production-ready code • Strong communication skills and willingness to learn from experienced engineers • Open mindset and adaptability to work in a dynamic, evolving environment • Fluent in English • Must be located in Poland Agile Experience • Basic understanding of Agile/Scrum methodologies • Ability to work in a collaborative, fast-paced team environment Nice to Have • Interest in areas such as AI, Data Engineering, or distributed systems • Experience with AI coding assistants (e.g., Claude AI / Claude Code) • Exposure to cloud platforms or DevOps practices What We Offer • Work in international teams (Poland, UK, US) • Structured development path with mentorship from senior engineers • Exposure to cutting-edge technologies, including GenAI and AI Agentic systems • Opportunity to grow within a high-impact financial domain

🏢 Summary: Mid-Level Java/Kafka Fullstack Developer role focused on modernizing legacy payment systems to ISO20022 standards within a distributed microservices environment. The position involves designing, developing, and integrating high-quality backend and fullstack solutions using Java and Kafka in a hybrid work model in Warsaw. The role supports global financial messaging transformation projects in a payments engineering context. 🗂️ Requirements: 4+ years of professional software development experience, Strong proficiency in Java and Spring frameworks, Experience with Hibernate and DB2, Hands-on experience with Apache Kafka (producers, consumers, Streams, Connect), Experience with MongoDB, Experience in RESTful API development, Knowledge of microservices or event-driven architectures, Experience with Docker, Experience with Git and CI/CD pipelines, Experience with Maven multi-module projects, Communicative Polish, Communicative English, Legal right to work in the European Union 📃 Skills: Java, Spring, Hibernate, DB2, Kafka, MongoDB, REST, Docker, Git, GitLab, CI/CD, Maven, ISO20022, SWIFT, CBPR+, FIN, Microservices 🏢 Description: Empower Financial Innovation - Redefine Payment Systems with Next-Gen Technology! Warszawa-based opportunity with hybrid work model As a Senior Java/Kafka Developer – Payments and Financial Messaging , you will be working for our client, a leader in the financial services industry, dedicated to transforming payment systems and implementing cutting-edge messaging standards. Join a dynamic team focused on adapting legacy applications to non-discretionary ISO20022 standards, enabling secure and efficient financial messaging worldwide. This role offers an exciting pathway for career growth within a forward-thinking organization committed to innovation. Your main responsibilities: Collaborate in requirements gathering sessions with business stakeholders to ensure technical solutions meet business needs Analyze, design, and plan impactful technical changes within complex payment systems Develop, test, and deploy modifications to legacy applications aligned with ISO20022 standards Conduct code reviews, support UAT processes, and assist with seamless code releases Apply creative problem-solving to improve the tech stack and optimize system performance Reverse engineer complex code bases to implement high-impact modifications effectively You're ideal for this role if you have: Minimum 5 years of professional experience in Java development Strong expertise in Java, Spring, Hibernate, and DB2 Experience with Spring Boot, dependency injection, auto-configuration, and Spring Data Hands-on knowledge of Apache Kafka (producers, consumers, Kafka Streams, Kafka Connect) Familiarity with RESTful API development, and microservices architectures Knowledge of containerization tools like Docker Proficiency with Git, CI/CD pipelines (preferably GitLab CI) It is a strong plus if you have: Past experience in financial services, banking technology, or payments industry is a plus Understanding of financial messaging standards such as ISO 20022, SWIFT, CBPR+ or FIN Experience with IBM MQ / JMS - queue managers and channels Infrastructure as Code expertise - provisioning and managing infrastructure Language Required for the role: Fluent Polish and English communication skills Eligibility for the role: Only candidates with an existing legal right to work in the European Union will be considered for this role #MAKEYourCareerBETTER Interested? Apply now and include your CV (preferably in English) along with a statement confirming your consent to the processing and storage of your personal data.

🏢 Summary: Senior Java Developer role focused on building and enhancing payment services within a modern microservices architecture. The position involves developing new features, supporting production systems, and ensuring high-quality code in a distributed, cloud-native environment. Work includes collaboration in an international team with partial onsite presence in Warsaw. 🗂️ Requirements: 8+ years of Java development experience, Strong knowledge of microservices architecture, Understanding of distributed systems, Experience with API design, Practical experience with MongoDB, Practical experience with Kafka, Experience with Docker, Experience with Kubernetes, Experience with unit testing, Ability to perform troubleshooting and root cause analysis, Fluent English 📃 Skills: Java, Spring, OpenShift, Kubernetes, Kafka, RabbitMQ, MongoDB, Oracle, Docker, Microservices, REST, JUnit 🏢 Description: About the Project Our client is a paytech company expanding in Europe. You will work in a truly international environment with colleagues across all Nexi group locations. The platform is built on a modern microservices architecture, offering plenty of opportunities to tackle complex challenges and make a significant impact. First customers have already been migrated, but there is still a big backlog of new features that need to be implemented. Work Mode: one day per week at the office is required (Warsaw) Technology stack in use:• Java 21 (Spring Boot 3)• OpenShift / Kubernetes• Apache Kafka / Rabbit MQ for streaming and queuing• MongoDB• Oracle Database• Multiple DevOps tools for development, automation and monitoring Job Responsibilities Design, develop and support testing payment services features together with the team Resolve issues by troubleshooting and root cause analysis and support in production issueanalysis when needed Ensure high quality via unit testing and code reviews Demo and document the results of work in demo sessions Expectations 8+ years of experience with Java development Understanding of microservices architecture and distributed systems Familiarity with API design principles Daily use of MongoDB, Kafka, Docker, Kubernetes Familiarity with agile environment Fluency in English Nice to have: experience in designing and implementing high-throughput, low-latency systems capable of handling large data volumes; Groovy, Maven, Jenkins; Knowledge of the Card Processing domain; We offer Ongoing support from a dedicated agent who is caring about your project continuity, contact with clients, necessary formalities, work comfort, and development. Career Development Program – advice on career planning based on the latest trends and market needs in IT, including consultations with career agents and mentors. Access to 7N Learning & Development – a development and educational platform offering webinars, a library of articles and industry reports, and frequent invitations to both one-time and recurring events focused on technical, business, and lifestyle topics. Spectacular events, both for you (e.g., annual Kick-Off trip , Christmas parties, or Summer Olympics sports events) and for your loved ones (e.g. family picnics), Professional growth Professional growth beyond your current project. You can actively engage in knowledge sharing through the 7N Services offering, designed for 7N clients. Connections and access to the expertise of top IT professionals in the market – the average professional tenure of our consultants in Poland is over 10 years, A complete benefits package, including funding for medical care, life insurance, sports cards for you and your loved ones, as well as discounts in stores in Poland and abroad. About 7N Constantly searching for projects, difficult rate negotiations, lack of development support – sounds familiar? At 7N, you gain not only stability of contracts but also the personal involvement of a dedicated agent who ensures your professional comfort and continuous access to development initiatives. Our mission is to provide stable and rewarding collaborations that drive your success as an IT expert and the success of our clients. We build long-lasting relationships based on Scandinavian values and 30 years of experience creating IT solutions for over 200 organizations.