Senior Mainframe IBM z/OS developer (willingness to learn Assembler)

Deloitte is looking for an experienced Mainframe Developer to support clients in system development, maintenance, and modernization initiatives, focusing on IBM z/OS and mainframe architecture.

• Thorough understanding of IBM z/OS and mainframe architecture.
• Proficient in Assembler and COBOL programming and mainframe environments.
• Minimum 4-5 years’ experience in Assembler/Cobol development, with at least 3 years on mainframe systems.
• Hands-on experience with IBM Db2.
• Experience with performance and debugging tools.
• Strong understanding of memory management and system-level programming concepts.
• Proven ability to troubleshoot and resolve complex production issues.
• Excellent command of English and Polish (at least B2 level).
• Location in Poland with a valid work permit required.

Nice to have:

• Skilled in integrating Assembler code with COBOL, PL/I, or Java applications.
• IBM Certified System Programmer and z/OS Mastery certifications are advantageous.

• Develop, test, and optimize Assembler code for mainframe environments.
• Maintain and improve existing legacy Assembler applications to align with evolving business requirements.
• Work closely with cross-functional teams to integrate Assembler modules with COBOL and Java systems.
• Enhance system performance by utilizing monitoring tools such as IBM RMF and OMEGAMON.
• Diagnose and resolve complex technical issues through advanced debugging techniques.
• Provide guidance and mentorship to junior developers, facilitating knowledge exchange sessions.
• Participate in planning and executing system modernization initiatives and technology upgrades.

Candidates must be located in Poland and have a valid work permit.