General Information

Position
Mainframe (z/OS, Assembler) Developer | Deloitte | Poland
Work arrangement
Full-time
City
Gdansk, Katowice, Krakow, Lodz, Poznan, Rzeszow, Szczecin, Warsaw, Wroclaw
Country
Poland
Department
Consulting
Team
Deloitte Digital
Area of interest
Consulting, Engineering
Way of work
Remote

Description & Requirements

Who we are looking for
We are looking for an experienced Mainframe Developer with strong expertise in Assembler (HLASM) programming to support our clients in system development, maintenance, and modernization initiatives. The ideal candidate will possess a thorough understanding of IBM z/OS, mainframe architecture, and related technologies.

  • Proficient in Assembler programming and mainframe environments, including IBM z/OS
  • Minimum of 4–5 years’ experience in Assembler development, with at least 3 years working on mainframe systems
  • Hands-on experience with DB2
  • Experienced with performance and debugging tools
  • Strong understanding of memory management and system-level programming concepts
  • Proven ability to troubleshoot and resolve complex production issues effectively
  • Excellent command of English 
  • You need to be located in Poland
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



Your future role
  • 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.
What we offer

A budget to spend on benefits that suit you, on top of your salary. Open colleagues, an environment that encourages proactivity, creativity, cooperation and openess. Contribution to practice development by shaping fit-for-purpose approaches and methodologies for Deloitte clients. Fast-paced development in a dynamic, high growth environment. Work with Deloitte clients locally and globally, delivering high-impact solutions to complex challenges and helping them drive exceptional performance.

Selection process

  • Stage 1 - Send your CV in word or pdf format in English.
  • Stage 2 - Join an HR screening
  • Stage 3 - Attend a Hiring Manager interview (online)
  • Stage 4 -Attend our client online interview

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