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Description & Requirements Who we are looking for We are looking for an Mainframe Developer 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. Good knowledge ofIBM z/OSand mainframe concepts Familiarity with COBOL and/or Assembler (willingness to learn Assembler if COBOL is the primary language) 2-3 years of experience in mainframe development, internships, or academic projects Introductory experience or understanding of DB2 Awareness of debugging and performance monitoring concepts Basic understanding of memory management and system-level programming principles Ability to analyze problems and learn troubleshooting techniques Ability to work in international environment and international team (global) Good command of English (written and spoken), Polish at least B2 level Located in Poland with valid work permit Nice to have: Exposure to integrating Assembler or COBOL with other technologies (e.g., PL/I or Java) Knowledge of any other programming languages, programming concepts Relevant coursework, certifications, or training in mainframe or z/OS technologies Your future role Go through the assembler training path as well as mainframe environment training path to become member of international development team Assist in developing, testing, and maintaining Assembler and COBOL code in mainframe environments Support enhancements and maintenance of existing legacy applications Collaborate with experienced developers and cross-functional teams on system integration tasks Learn to use performance monitoring and debugging tools to identify and resolve issues Participate in incident analysis and problem resolution under guidance from senior team members Take part in system modernization initiatives and gain exposure to new mainframe technologies Continuously build technical skills through mentorship, training, and hands-on experience 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 openness. 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 pdf format in English. Stage 2 - Join an HR screening Stage 3 - 2 interviews: technical one and on the business side About Deloitte In Deloitte we support leading global organizations in optimizing and transforming their organizations. This also relates to their finance function. Our consultants offer insights, capabilities, and solutions that change the way these organizations operate and make people-related decisions. We are currently building in Poland a dedicated team which will focus on advisory in the area of Finance & Performance. The Team will advise our Clients in complex issues relating to i.a. Reporting, Budgeting, Controlling processes. We are looking for high-energy, committed and ambitious people to join our advisory practice. Next to advising on most sophisticated and challenging issues relating to the above mentioned areas, our Consulting professionals will also advise on potential solutions leading to optimisation of the above mentioned processes. This will also include applying the newest technologies. Are you ready to join our team and help our clients imagine, deliver, and run their future?
Here's where they are and how to stand out in your next interview.
24.795Jobs
9.577IN
74%EN
That number includes positions in India (9,577), Poland (3,429), the United States (1,753), Singapore (787), and Brazil (779). If you're looking to move or work remotely, check which countries match your goals — then filter WorkMundi by location to see what's actually hiring near you.
Most developer ads you'll see are written in English: 18,397 of the 24,795. That doesn't tell you whether the job itself requires you to speak English or work in English daily, so read each posting carefully. Don't assume the language of the ad matches the language of the team.
The employers posting the most developer roles are Link Group (369 jobs), Upvanta (257), jobgether (226), and OfferZen (212). If you're applying to any of these, research their hiring patterns. They move fast and post often, which means they're either scaling hard or replacing people who didn't fit.
In your interview, expect this: 'Walk me through the last time you had to debug something that took you more than an hour. What was it, what did you try first, and what would you do differently?' Hiring managers ask this to see if you think systematically or just try random fixes. Have a real example ready with specifics.