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