Mainframe / COBOL Developer

Job description About RMT Labs RMT Labs SA is a Luxembourg-based research and technology company building the future of hiring in Europe. We operate two complementary brands: Talent Quanta, a profitable recruitment and ICT-consulting business serving clients across Europe since 2022, and Skillbourg, an AI-powered talent platform born from that real-world recruitment intelligence. About the role As a Mainframe / COBOL Developer in our enterprise applications team, you will maintain and modernise core systems that large organisations depend on every day. You will work with z/OS, COBOL and DB2, and help clients move these systems forward safely. What you will do - Develop, maintain and optimise COBOL programs on z/OS - Write and tune DB2 SQL - Analyse and fix production issues in batch and online systems - Work on modernisation projects such as API enablement and code refactoring - Write technical documentation and share knowledge with colleagues - Work with business analysts and testers to deliver changes safely What you bring - 6+ years of experience as a mainframe developer - Strong skills in COBOL, JCL and DB2 - Experience with CICS or IMS - Experience supporting business-critical production systems - A careful, structured way of working - You work well remotely and communicate clearly Nice to have - Experience with mainframe modernisation tools and approaches - Knowledge of Java or REST APIs on z/OS - Experience in banking or insurance - Experience with DevOps tools for mainframe Skills we're looking for Technical skills - COBOL - IBM Db2 - JCL - Mainframe Systems - CICS Interpersonal skills - Troubleshooting - Written Communication - Cross-Functional Collaboration - Attention to Detail - Work Autonomy