Senior Software Developer – Product Modeler (f/m/x)

🏢 Summary: The offer is for a Software Developer role focused on building and scaling internal microservices and APIs that process and localize large volumes of e-commerce data. The position involves designing highly scalable web applications, improving performance, and working in a Test Driven Development environment within an agile team. The developer will contribute to architecture decisions and ensure high technical standards across distributed systems. 🗂️ Requirements: 5+ years of Python experience, Experience designing highly scalable web applications, Experience with AI-assisted coding, Knowledge of TDD, Knowledge of REST and Swagger/OpenAPI, Basic knowledge of AWS (EC2, RDS, S3), Basic DevOps skills (*nix, Apache/nginx, Docker, Kubernetes), Experience with SOA and message queues, Strong analytical skills, Experience working in Agile environment, Good written and spoken English 📃 Skills: Python, REST, Swagger, OpenAPI, AWS, EC2, RDS, S3, Docker, Kubernetes, Apache, nginx, Linux, RabbitMQ, SOA, TDD, GitLab, JIRA, CI 🏢 Description: Who are we looking for? As a Software Developer, you will be a part of a multi-disciplinary agile team responsible for developing services and plugins to process and localize large amounts of e-commerce listings and run thousands of localized E-commerce sites. You will bring on board: Focus on customer needs and business objectives, Willingness to understand product and company vision and strategy, and ability to effectively work with product and business owners, Proactive and “can-do” attitude, 5+ years of Python experience, Experience in using AI for coding Ability to define, set, maintain, and ensure high-quality technical standards, Experience in designing highly scalable web applications, Strong analytical skills, Knowledge of TDD, Knowledge of REST (Swagger/OpenAPI), At least basic knowledge of Amazon Web Services (EC2, RDS, S3), At least basic DevOps skills (*nix, Apache/nginx, Docker, Kubernetes), Experience in SOA, message queues (like RabbitMQ), Good written and spoken English, comfortable with working in an international environment. Nice to have Having contributed to Open Source (send us your GitHub id!), Advanced DevOps skills (*nix, Apache/nginx, Docker, Kubernetes), Advanced knowledge of Amazon Web Services (EC2, RDS, S3, ELB, EBS, EKS), Experience developing and maintaining complex web architectures, Experience in event-driven architecture, Experience with NoSQL databases, Experience as an EventStorming participant, Broad experience working in an Agile environment, Knowledge of GraphQL, Knowledge of CQRS/DDD. What do we do? We work on the development of our internal micro-services & APIs to support a flow of millions of products and orders between domestic and international stores, We improve the performance and scalability of our services, We breathe and live by Test Driven Development to outsmart our QA colleagues, We continually seek to develop our skills, learning tools, and technologies that help us master our profession, We stand up to the challenges our software may present to the not-so-amused customer, we are the light in the tunnel, not just at the end of it, We influence our peers, and our stakeholders to design a top-notch solution for every problem space we put our hands on, We help with architecture-level design decisions during various phases of a project. How do we work? We believe in teamwork and self-organization, We follow Agile principles (Scrum and Kanban), We are highly autonomous - we choose our own goals and projects which contribute to a company strategy as well as tools that make our work efficient, We are closely cooperating with the business stakeholders, data engineers, data science, and other product developers, We use Agile development flow based on GitLab, JIRA, Slack, and the CI, We have a mature product pipeline with predefined specs, designs, and architectures for all features, We have a battle-proven approach to testing, static code analysis, and code reviews.

🏢 Summary: Senior .NET Developer role focused on designing, extending, and modernizing critical banking systems within securities and core banking domains. The position involves full-stack development, system integration, and cloud scaling in a distributed team without a separate QA function. Work includes end-to-end ownership of business-critical applications in a regulated investment banking environment. 🗂️ Requirements: 5+ years experience with .NET and C#, Hands-on experience in banking or investment banking, Full-stack development experience, Strong knowledge of SOLID principles, Experience with document-based databases, Experience with event-driven messaging frameworks, Knowledge of unit and integration testing, End-to-end application development experience, Ability to work independently in regulated environments, Availability during UK business hours, Poland-based residency 📃 Skills: .NET, C#, MongoDB, SQL, REST, Microservices, Docker, Kubernetes, Azure, UnitTesting, IntegrationTesting, EventDriven, Git 🏢 Description: Work model: 100% remote (candidates must be based in Poland) Contract type: B2B Industry: Banking / Investment Banking We are looking for an experienced Senior .NET Developer to join a distributed engineering team working on critical banking systems. The role focuses on extending and modernising applications used across securities and banking operations, with a strong emphasis on system design, scalability, and cloud transformation. You will work end-to-end on business-critical systems, closely collaborating with Business Analysts, without a separate QA team. A solid background in banking or financial services is essential. Main Responsibilities: Design, develop, and extend .NET-based systems supporting multiple banking entities Contribute to the integration of securities and core banking platforms Support and enhance a portfolio of ~17 applications across product control and risk management Work with an in-house development framework in a full-stack capacity Participate in scaling applications for cloud-based, containerized environments Collaborate closely with business stakeholders to deliver robust solutions Ensure high code quality through unit and integration testing Key Requirements: 5+ years of professional experience as a .NET / C# Developer Hands-on experience in the banking or investment banking sector (mandatory) Full-stack development experience (backend-focused, frontend included) Strong understanding and practical application of SOLID design principles Experience with document-based databases (e.g. MongoDB) Experience with event-driven / event-based messaging frameworks Solid knowledge of unit and integration testing Experience working end-to-end on applications (development, testing, support) Ability to work independently in a fast-paced, regulated environment Availability during UK business hours Nice to Have: Experience with cloud platforms and application migration to cloud Experience with container technologies (e.g. Docker, Kubernetes) Exposure to systems such as Murex or large in-house banking platforms Background in securities, risk, or product control systems Other Details: This role is 100% remote with candidates required to be located in Poland. The contract is on a B2B basis within the banking and investment banking industry.

🏢 Summary: Senior .NET Developer role focused on designing, extending, and modernising critical banking and securities systems in a fully remote B2B model. The position involves full-stack development, system integration, and cloud scaling within distributed, business-critical environments. The role requires close collaboration with business stakeholders and ownership of end-to-end application delivery. 🗂️ Requirements: 5+ years experience as .NET / C# Developer, Experience in banking or investment banking sector, Full-stack development experience, Knowledge of SOLID design principles, Experience with document-based databases, Experience with event-driven messaging frameworks, Experience with unit and integration testing, End-to-end application development experience, Ability to work during UK business hours, Based in Poland 📃 Skills: .NET, C#, MongoDB, SOLID, Messaging, UnitTesting, IntegrationTesting, Docker, Kubernetes, Cloud 🏢 Description: Work model: 100% remote (candidates must be based in Poland) Contract type: B2B Industry: Banking / Investment Banking We are looking for an experienced Senior .NET Developer to join a distributed engineering team working on critical banking systems. The role focuses on extending and modernising applications used across securities and banking operations, with a strong emphasis on system design, scalability, and cloud transformation. You will work end-to-end on business-critical systems, closely collaborating with Business Analysts, without a separate QA team. A solid background in banking or financial services is essential. Main Responsibilities: Design, develop, and extend .NET-based systems supporting multiple banking entities Contribute to the integration of securities and core banking platforms Support and enhance a portfolio of ~17 applications across product control and risk management Work with an in-house development framework in a full-stack capacity Participate in scaling applications for cloud-based, containerized environments Collaborate closely with business stakeholders to deliver robust solutions Ensure high code quality through unit and integration testing Key Requirements: 5+ years of professional experience as a .NET / C# Developer Hands-on experience in the banking or investment banking sector (mandatory) Full-stack development experience (backend-focused, frontend included) Strong understanding and practical application of SOLID design principles Experience with document-based databases (e.g. MongoDB) Experience with event-driven / event-based messaging frameworks Solid knowledge of unit and integration testing Experience working end-to-end on applications (development, testing, support) Ability to work independently in a fast-paced, regulated environment Availability during UK business hours Nice to Have: Experience with cloud platforms and application migration to cloud Experience with container technologies (e.g. Docker, Kubernetes) Exposure to systems such as Murex or large in-house banking platforms Background in securities, risk, or product control systems Other Details: This role is 100% remote with candidates required to be located in Poland. The contract is on a B2B basis within the banking and investment banking industry.

🏢 Summary: Senior Java Developer role in a hybrid model (up to 4 remote days per week) focused on designing and delivering robust, scalable enterprise applications. The position involves end-to-end Java development, technical design, troubleshooting, and contribution to CI/CD processes. You will collaborate with cross-functional teams to build high-quality, performance-driven software solutions. 🗂️ Requirements: Minimum 7 years of professional experience in Java development, Strong proficiency in Java and enterprise-level applications, Solid understanding of software design patterns and architecture, Ability to work in a hybrid work model, Fluent English proficiency, Good command of Polish, Legal right to work in the European Union 📃 Skills: Java, CI/CD, Microservices, Cloud, Architecture, DesignPatterns 🏢 Description: Empower innovative software solutions — shape the future of Java development! Warszawa-based opportunity with hybrid work model (up to 4 remote days per week) As a Senior Java Developer within our client’s software development team, you will be working for a leading industry innovator dedicated to delivering cutting-edge applications. Your expertise will drive the development of robust, scalable, and efficient systems that empower organizations and transform digital experiences. Your main responsibilities: Design, develop, and maintain high-quality Java applications aligned with project requirements Collaborate with cross-functional teams to deliver seamless software solutions Identify and troubleshoot technical issues to ensure optimal system performance Participate in code reviews, testing, and documentation to uphold coding standards Contribute to continuous integration and deployment processes to enhance development workflows Implement best practices in software development and contribute to technical design discussions You're ideal for this role if you have: At least 7 years of professional experience in Java development Strong proficiency in Java, with experience in enterprise-level applications Solid understanding of software design patterns and architecture Ability to work effectively in a hybrid environment with a flexible remote schedule Good command of Polish and English, with fluent proficiency in English Excellent problem-solving skills and attention to detail It is a strong plus if you have: (optional) Experience with cloud platforms or microservices architecture Knowledge of additional programming languages or frameworks Certifications in Java or related technologies Language Required for the role: Polish and English – fluent proficiency in English preferred 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 designing and delivering robust, scalable enterprise applications within a hybrid work model. The position involves full-cycle development, technical design, troubleshooting, and contributing to CI/CD processes. Ideal for experienced Java professionals who want to shape high-quality software solutions in a collaborative environment. 🗂️ Requirements: Minimum 7 years of professional experience in Java development, Strong proficiency in Java and enterprise-level applications, Solid understanding of software design patterns and architecture, Fluent English proficiency, Good command of Polish, Ability to work in a hybrid work model, Legal right to work in the European Union 📃 Skills: Java, CI/CD, Microservices, Cloud, Architecture, DesignPatterns 🏢 Description: Empower innovative software solutions — shape the future of Java development! Warszawa-based opportunity with hybrid work model (up to 4 remote days per week) As a Senior Java Developer within our client’s software development team, you will be working for a leading industry innovator dedicated to delivering cutting-edge applications. Your expertise will drive the development of robust, scalable, and efficient systems that empower organizations and transform digital experiences. Your main responsibilities: Design, develop, and maintain high-quality Java applications aligned with project requirements Collaborate with cross-functional teams to deliver seamless software solutions Identify and troubleshoot technical issues to ensure optimal system performance Participate in code reviews, testing, and documentation to uphold coding standards Contribute to continuous integration and deployment processes to enhance development workflows Implement best practices in software development and contribute to technical design discussions You're ideal for this role if you have: At least 7 years of professional experience in Java development Strong proficiency in Java, with experience in enterprise-level applications Solid understanding of software design patterns and architecture Ability to work effectively in a hybrid environment with a flexible remote schedule Good command of Polish and English, with fluent proficiency in English Excellent problem-solving skills and attention to detail It is a strong plus if you have: (optional) Experience with cloud platforms or microservices architecture Knowledge of additional programming languages or frameworks Certifications in Java or related technologies Language Required for the role: Polish and English – fluent proficiency in English preferred 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: Long-term remote Software Developer (.NET + BI) contract supporting a European Union organization, focused on enterprise business intelligence solutions. The role combines hands-on system design and development with technical leadership, solution documentation, release management, testing, and advanced support. The offer includes a rate of 215 PLN net + VAT per hour and co-financed medical and sports packages. 🗂️ Requirements: Minimum 4 years of professional IT experience, Bachelor’s or engineering degree in IT, Completion of at least one full software solution lifecycle, Enterprise software development expertise, UML application design proficiency, Data, business-logic, and UI layer design and development experience, Scrum experience, Technical team leadership capability, Technical solution documentation skills, Intermediate software-development certification or internationally recognized equivalent, Software Developer experience on at least 2 Microsoft BI or similar solution projects, In-depth knowledge of physical databases, SQL, BI, reporting, ETL, data modelling, OLAP, and data mining, Minimum 3 years of Microsoft Power BI or similar BI tool experience, Minimum 5 years of .NET experience, EU citizenship, Ability to work from Poland 📃 Skills: .NET, PowerBI, SQL, UML, Scrum, ETL, OLAP, BI, Databases, Reporting, Modelling, Mining, Testing 🏢 Description: Software Developer (.NET + BI)

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🏢 Summary: Remote, long-term B2B contract for an experienced .NET Software Developer supporting a European Union organization. The role covers enterprise-system design and development, technical leadership, solution architecture, quality optimization, releases, testing, and 2nd/3rd-line support. Rate: 215 PLN net + VAT per hour. 🗂️ Requirements: Completed at least one full solution lifecycle, Expertise in enterprise-level software development, UML application design, Data, business-logic and UI-layer design and development, Scrum experience, Technical team leadership capability, Technical-solution documentation skills, Problem-solving skills, At least 2 years of experience with mission-critical complex enterprise systems, Experience with asset and/or human-resources management and financial-management systems, At least one internationally recognized intermediate software-development certification relevant to the domain 📃 Skills: .NET, UML, Scrum, Enterprise, Testing, Prototyping, Configuration, Deployment 🏢 Description: We are looking for an experienced Software Developer .NET (m/f/n) to support a long-term project delivered for an organization of the European Union. Requirements - Has gone at least one time through the complete lifecycle of a solution - Expert in developing enterprise-level software systems in the specified technology domain - Knows UML and can design applications in UML - Proficient in designing and developing data, business logic, and UI layers - Worked in Scrum development - Capable of leading technical teams - Able to document technical solutions effectively - Strong problem-solving skills Specific requirements - At least 2 years of experience with mission-critical, complex enterprise systems, including asset and/or human-resources management and financial management - At least one certification: an intermediate-level software-development certificate relevant to the domain, or an equivalent internationally recognized certification accepted by the Contracting Authority Typical tasks and responsibilities - Design and develop the system - Lead development teams - Translate requirements into design - Optimize software for performance, security, and quality - Produce technical documentation - Estimate development effort and time - Set software-development standards - Propose technical solutions for business needs and technical problems - Collect and interpret software metrics - Manage configuration and releases - Contribute to requirements analysis, testing, quality assurance, change management, and deployment - Test solutions and develop testing tools - Document developments - Prototype solutions - Act as 2nd- and 3rd-line support Offer - Rate: 215 PLN net + VAT per hour - Remote setup

🏢 Summary: Senior Java Developer role focused on building, maintaining, and optimizing scalable Java applications for complex financial and enterprise systems in a hybrid Krakow setup. The position involves working with microservices architecture, REST APIs, and databases within an Agile environment. You will contribute to design, development, performance optimization, and technical reviews. 🗂️ Requirements: Minimum 6 years of Java development experience, At least 5 years of experience with Spring and Spring Boot, Strong experience with Microservices architecture, Strong knowledge of REST APIs and integration patterns, Experience with SQL and NoSQL databases, Ability to design application architecture, Experience working in Agile environments 📃 Skills: Java, Spring, SpringBoot, Microservices, REST, SQL, NoSQL, APIs, Architecture, Agile 🏢 Description: 📍 Location: Krakow, hybrid 3 days/week Role: Senior Java Developer Role Description: We are looking for an experienced Java Developer to join technology team. You will be responsible for developing, maintaining, and optimizing Java-based applications that support complex financial systems and enterprise platforms. Key Competencies: Agile way of working and collaboration in cross-functional teams Advanced Java concepts and object-oriented design principles Java API management, RESTful services, and Microservices architecture Database technologies (SQL / NoSQL) and performance optimization Requirements: Minimum 6 years of experience in Java development Strong experience with Spring / Spring Boot and Microservices (5+ years) Good understanding of REST APIs, integration patterns, and application architecture Experience with database technologies and writing efficient queries Ability to work in a team environment and communicate effectively with technical and non-technical stakeholders Experience working in Agile delivery environments Nice-to-Have / Bonus Skills: Experience in production support and troubleshooting Participation in design and architecture reviews Exposure to cloud platforms and modern deployment pipelines Mentoring or leading technical discussions Responsibilities: Design, develop, and maintain scalable Java applications Participate in design and code reviews Troubleshoot issues and optimize system performance Collaborate with business analysts and other teams to deliver solutions Prepare technical documentation and reports as needed

🏢 Summary: Remote B2B opportunity to develop, maintain, and integrate a Microsoft-based Business Intelligence platform for training administration. The role focuses on .NET application development, Power BI reporting, data warehouse solutions, ETL integration, technical support, and administrator training in an international project. 🗂️ Requirements: Microsoft-based application development experience, .NET development experience, Power BI experience, ETL tools experience, UML experience, SQL experience, Business Intelligence solution design and development experience, Data warehouse and BI data storage experience, Business-to-technical requirements translation, Software maintenance, troubleshooting, and technical support experience, Documentation and communication skills 📃 Skills: .NET, PowerBI, ETL, UML, SQL 🏢 Description: We are looking for a Software Developer (.NET, Power BI, ETL tools) to join an international organization delivering a Business Intelligence platform supporting training administration. The project focuses on the further evolution, maintenance, and integration of an existing Microsoft-based solution, enhancing reporting capabilities, expanding data sources, and supporting the development of new application features. Responsibilities - Design and develop Microsoft-based applications for training management. - Enhance and maintain Business Intelligence reports, dashboards, and data models. - Develop, test, and implement data warehouse solutions for BI reporting and analytics. - Collaborate with business stakeholders to translate requirements into technical solutions. - Integrate applications with other systems to ensure data consistency and real-time information exchange. - Optimize applications from performance, security, and quality perspectives. - Contribute to requirements analysis, testing, quality assurance, deployment, and change management. - Produce technical and user documentation. - Provide maintenance (corrective, adaptive, and preventive) and 2nd/3rd line technical support. - Deliver user training for administrators. Requirements - Experience with Microsoft-based application development. - Experience with .NET development. - Experience with Microsoft Power BI, ETL tools, and UML. - Experience in SQL. - Experience designing and developing Business Intelligence solutions, including reports, dashboards, and data models. - Experience working with data warehouses and BI data storage. - Ability to collaborate with business stakeholders and translate business requirements into technical solutions. - Experience with software maintenance, troubleshooting, and technical support. - Strong documentation and communication skills. Offer - B2B contract. - 100% remote work. - Opportunity to work on the evolution of a large-scale Business Intelligence platform supporting business-critical processes. - International project with a strong focus on software development, system integration, and Business Intelligence.

🏢 Summary: Java Developer role focused on building and enhancing enterprise-grade server-side systems and microservices within Scrum teams. The position involves defining technical architecture, improving system scalability and maintainability, and collaborating with global stakeholders. Hybrid work with 3 days per week in the office is required. 🗂️ Requirements: 2+ years of professional software development experience, Strong expertise in Java, Experience with Spring Boot, Experience designing and implementing Microservices, Knowledge of Kafka, Experience building distributed systems, Strong Oracle SQL skills, Experience with unit and integration testing, English proficiency at B2 level or higher 📃 Skills: Java, Spring, SpringBoot, Microservices, Kafka, Oracle, SQL, JUnit, Mockito, Azure 🏢 Description: We are seeking a Java Developer to join our team of software delivery experts and contribute to the evolution and enhancement of one of our key components. Working within the Scrum framework, you will become an integral part of one of our component teams, where you will help to define the component's architecture and bring your deep expertise in cutting-edge technologies to significantly enhance both performance and usability. You will collaborate closely with delivery teams based in Krakow as well as business stakeholders across the globe. A presence of 3 days per week in our office is required. Responsibilities Participate actively as a full member of a Scrum team, attending all ceremonies and supporting ongoing enhancements to team workflows Generate tangible business outcomes by designing and implementing reliable, scalable core Java server-side systems Define and shape high-level technical architecture for epics, making sure each solution supports long-term system objectives Write clean, well-tested code with strong automation coverage, serving as a role model and establishing quality standards across the team Evaluate design proposals submitted by colleagues and verify that delivered code meets the required quality benchmarks Drive continuous refactoring efforts on the existing codebase to preserve clarity, maintainability, and technical health Perform thorough code reviews, offering valuable feedback and guiding less experienced developers in their professional growth Requirements Minimum of 2 years of professional, hands-on experience in software development Deep expertise in Java for the creation of enterprise-level server-side applications Substantial practical knowledge of Spring Boot for crafting contemporary, production-ready microservices Demonstrated background in designing and implementing Microservices solutions, including the use of Kafka for event streaming and the construction of distributed systems with an emphasis on scalability and resiliency Solid command of Oracle SQL, with the capability to author advanced queries, stored procedures, views, and joins Strong background in software testing methodologies, including the creation of dependable unit and integration tests Outstanding verbal and written communication abilities in English (B2+ level or above) Nice to have Familiarity with the Trade lifecycle domain and a general understanding of how financial market processes operate Practical exposure to MS Azure cloud services, including Azure Web Apps and Azure Functions, for the deployment and operation of cloud-hosted applications Working experience with JUnit and Mockito, combined with knowledge of test automation strategies and robust unit testing techniques EPAM is a leading global provider of digital platform engineering and development services. We are committed to having a positive impact on our customers, our employees, and our communities. We embrace a dynamic and inclusive culture. Here you will collaborate with multi-national teams, contribute to a myriad of innovative projects that deliver the most creative and cutting-edge solutions, and have an opportunity to continuously learn and grow. No matter where you are located, you will join a dedicated, creative, and diverse community that will help you discover your fullest potential.