
Infotree Service Sweden Filial · Warsaw
We are seeking a skilled and detail-oriented Java developer to join the Payments Engineering team. The candidate will work in a pod with 3-4 experienced Java de...
We are seeking a skilled and detail-oriented Java developer to join the Payments Engineering team. The candidate will work in a
pod with 3-4 experienced Java developers and focus on adapting legacy applications for non-discretionary ISO20022 changes, which
is a new financial messaging standard. An ideal candidate thrives in complex environments, is able to work under time pressure, is
keen to understand business logic and excels at reverse engineering a complex code base to implement high-impact changes.
The position requires 4 days/week in the office.
quantitative discipline)
Strong work ethic, ownership, willingness to engage and be challenged
JOB SPECIFICATION – JAVA TECHNICAL ANALYST ROLE OVERVIEW Position: Java Technical Analyst Location: Warsaw, Poland (Hybrid – 4 days onsite / 1 day remote) POSITION SUMMARY We are looking for an experienced Java Technical Analyst to join a business-critical FinTech project supporting the development and modernization of a large-scale Terminal Management System (TMS) managing over 300,000 payment terminals. This role is ideal for someone who enjoys understanding complex enterprise systems, analyzing existing code, and delivering technical solutions within a legacy environment. You will work closely with developers, architects, analysts, and business stakeholders to enhance and modernize mission-critical applications while ensuring system stability, maintainability, and performance. KEY RESPONSIBILITIES TECHNICAL ANALYSIS & SOLUTION DESIGN * Analyze business and technical requirements to design effective application solutions. * Review functional and analytical documentation and translate requirements into technical implementations. * Prepare and maintain comprehensive technical documentation. * Perform reverse engineering of existing applications using source code, technical documentation, databases, and business processes. * Analyze legacy applications and recommend technical improvements. DEVELOPMENT & MODERNIZATION * Implement enhancements and modifications within existing Java applications. * Support technical upgrades and modernization of legacy systems. * Design, develop, and test application components following best engineering practices. * Develop automated test cases and support application quality initiatives. INTEGRATION & SYSTEM SUPPORT * Participate in system integrations using REST APIs and messaging technologies. * Collaborate with cross-functional teams to troubleshoot and resolve technical issues. * Contribute to improving application performance, maintainability, and security. * Support continuous improvement of development processes and technical standards. REQUIRED QUALIFICATIONS EXPERIENCE * 4+ years of commercial experience with Java development. * Experience working with large enterprise or legacy systems. * Practical experience in technical analysis, software design, and system integration. * Experience maintaining and modernizing existing applications. TECHNICAL SKILLS * Strong knowledge of Java 8+ and object-oriented programming. * Hands-on experience with Spring, Spring Boot, Hibernate/JPA, and JEE. * Experience with RESTful APIs and distributed systems. * Good understanding of RabbitMQ or similar messaging technologies. * Experience with Oracle databases and SQL. * Knowledge of application servers such as JBoss or WildFly. * Familiarity with Maven, Git, GitLab, GitLab CI/CD, Jenkins, Nexus, and Jira. * Experience creating technical documentation and working with reverse engineering activities. SOFT SKILLS * Strong analytical and problem-solving mindset. * Ability to understand complex business processes and legacy architectures. * Excellent communication and stakeholder collaboration skills. * Ability to work independently while contributing to a collaborative team environment. * Good written and spoken English (B2 or higher). NICE TO HAVE * Experience in FinTech, banking, or payment processing environments. * Familiarity with distributed transactions and enterprise integration patterns. * Experience with code quality and security scanning tools (e.g., Fortify, Sonatype). * Exposure to legacy system modernization projects. WHAT SUCCESS LOOKS LIKE * Delivering high-quality technical solutions for complex enterprise applications. * Successfully analyzing and modernizing legacy code while maintaining system stability. * Producing clear technical documentation and supporting knowledge sharing. * Collaborating effectively with developers, architects, analysts, and business stakeholders. * Contributing to the continuous evolution of a large-scale, mission-critical payment platform.
Senior Java Developer (TMS) Job Responsibilities: • Design and implementation of IT solutions based on the presented analytical and technical documentation; • Reviewing analytical documentation; • Creating technical documentation; • Technical upgrade for existing system; • Working with legacy code • Conducting regular scans of the application and removing vulnerabilities Job Requirements: • Fully available in the Polish time zone; • Ability to work from the office in Warsaw (weekly: 4 days at the office + 1 day WFH ); • Very good knowledge of Java 8+ and object-oriented programming issues; • Experience in independent design, implementation, documentation, and testing of application components; • Very good and practical knowledge of Spring, Spring Boot, Hibernate/JPA, and JEE frameworks; • Practical knowledge with message queue systems, particularly RabbitMQ; • Practical knowledge of tools supporting the software development process: Maven, Git, Gitlab, Gitlab CI/CD, Jenkins, Nexus, Jira; • Knowledge of relational databases, in particular Oracle; • Practical knowledge of RESTful API design; • Experience in system integration; • Experience with distributed systems; • Experience with application servers, JBoss/WildFly; · Knowledge of scanning tools (Fortify, Sonatype..) • Knowledge of English / B2; Description of the area of involvement: TMS (Terminal Management System) is used to manage a very large number of payment terminals (300k+). It gives users a uniform way to manage different terminals from different hardware vendors. TMS has a complex architecture, consisting of two components: TMS (1 WildFly instance), providing a GUI and implementing some business functions, and RTMS (3 Spring-boot instances), implementing most of the business functionalities. A gradual migration from TMS to RTMS is being carried out. The system intensively uses Spring, Hibernate, and RabbitMQ. The system has distributed transactions (different two-phase-commit, saga approaches) and a distributed cache (Hazelcast). TMS is integrated with many internal and external systems (via REST, SOAP, RMI, direct database connections, and database links). The GUI is written in GWT and GWTExt.
We are seeking a talented and motivated Software Engineer to join our Securities Settlements Engineering team. The successful candidate will play a key role in developing and maintaining software solutions that support the efficient settlement of securities transactions. This role requires a solid foundation in software engineering principles, a passion for technology, and the ability to work effectively within a collaborative team environment. Key Responsibilities: • Develop and maintain high-performance software solutions for the settlement of Traiding Platform • Collaborate with senior engineers, architects, and other stakeholders to deliver solutions to complex problems • Participate in code reviews, testing, and debugging to ensure the quality and reliability of software solutions. Technology Stack: • Java • Spring Boot • Kafka • microservices Preferred Experience & Skills: • Bachelor's degree in Computer Science, Engineering, or a related field. • Problem-solving skills and attention to detail. • Experience with SDLC tools such as Gitlab • Understanding of containerization and orchestration technologies, such as Docker and Kubernetes. • Strong communication and interpersonal skills, with the ability to work effectively within a collaborative team environment. • Knowledge of securities settlements and post-trade processing is a plus. Python/C++ is a plus. The position is in a hybrid model: 2-3 days from the office/week. Minimum 5 years of experience required.