Software Engineer – Java (RegTech / FinTech)

Job Description You will join an international engineering team delivering high-performance solutions for clients in the RegTech / FinTech sector. The role focuses on building scalable systems for processing large volumes of financial and regulatory data, including work with formal data specifications such as XBRL. You will contribute to the full software development lifecycle, collaborating closely with both internal teams and client-side engineers. Key Responsibilities • Design and implement backend solutions in Java • Analyze, optimize, and improve code performance and scalability • Review and validate code (own and peers’) • Analyze and interpret formal data specifications (e.g., XBRL OIM, Table Constraints)• e.g. https://www.xbrl.org/Specification/oim/REC-2021-10-13+errata-2023-04-19/oim-REC-2021-10-13+corrected-errata-2023-04-19.html • e.g. https://www.xbrl.org/Specification/table-constraints/CR-2025-10-07/table-constraints-CR-2025-10-07.html • Translate business and technical requirements into software solutions • Participate in backlog refinement and development planning • Create and maintain technical documentation • Collaborate with client engineering teams during product implementation Requirements • Minimum 4 years of commercial experience in Java development • Experience designing and building applications across different architectures • Strong knowledge of Java frameworks, libraries, and development tools • Experience processing large datasets • Practical experience with Git • Knowledge of XML, XSD, and regular expressions • Good working proficiency in English (daily communication, documentation, client interaction) • Experience with JIRA and Confluence (or similar tools) • Strong analytical and problem-solving skills • Ability to work independently and adapt to changing priorities • Strong communication and teamwork skills Nice to Have • Knowledge of Gradle • Experience porting solutions from Java to .NET • Familiarity with XBRL technologies • Experience with scripting languages • Experience building web applications and microservices • Experience working with databases • Interest in algorithms and performance optimization About the Company FQS Poland Sp. z o.o. is fully owned by Fujitsu Limited, a leading global ICT company with approximately 155,000 employees supporting customers in over 100 countries. FQS Poland was established as a European R&D center focused on software development. Our mission is to deliver high-quality products and services, leveraging Fujitsu’s global portfolio while enabling technology transfer between Europe and Japan. The Kraków office operates as a Center of Excellence, contributing to advanced technology solutions in a global environment.