Mainframe Developer

Senior Mainframe Developer (DB2 for z/OS) Location: Stockholm (Hybrid) Contract Type: B2B / Contractor Industry: Financial Services We are currently supporting a strategic project with a leading financial services organization, Euroclear, and are looking for an experienced Senior Mainframe Developer to join a high-profile team working on mission-critical systems. Responsibilities

• Design, develop, maintain, and enhance applications running on IBM z/OS environments.
• Develop and support DB2 for z/OS databases, SQL queries, and stored procedures.
• Perform DB2 performance analysis, tuning, and optimization.
• Develop and maintain COBOL batch and online applications.
• Work with JCL, CICS, TSO/ISPF, and REXX to support daily operations and project delivery.
• Participate in troubleshooting, incident resolution, and root cause analysis.
• Collaborate with business and technical stakeholders on complex, high-visibility initiatives.

Required Skills

• 10+ years of hands-on experience in IBM Mainframe development.
• Strong expertise in:
• DB2 for z/OS
• COBOL
• JCL
• CICS
• TSO/ISPF
• REXX
• SQL and Stored Procedures
• Experience with batch processing environments.
• Knowledge of DB2 performance tuning and optimization.
• Understanding of data sharing and high-availability mainframe environments.
• Strong analytical and problem-solving skills.

Nice to Have

• Experience within banking, financial services, or capital markets.
• Previous experience working with Euroclear or similar financial institutions.
• Swedish language skills.

What You'll Work On You'll join a team delivering complex and highly visible initiatives supporting critical financial market infrastructure. This position offers the opportunity to contribute to large-scale enterprise systems while working alongside experienced professionals in a technology stack that remains central to the client's operations.