Mainframe Developer & Support (OS2200/COBOL)

  • Dormont Manufacturing Co
  • Milton Keynes, Buckinghamshire
  • 08/06/2026
Full time Information Technology Telecommunications

Job Description

What success looks like in this role

Unisys is a global technology solutions company that powers breakthroughs for the world's leading organizations. We specialize in delivering secure, cutting edge digital platforms, cloud and infrastructure services, enterprise computing, and business process solutions.

With a legacy of innovation and a forward thinking mindset, Unisys helps clients across industries-from government to financial services-to transform their operations and achieve mission critical outcomes.

Responsibilities
  • Provide day to day support for existing services and software enhancements on the mainframe element of the solution.
  • Attend the client site three days per week.
  • Identify problems and potential resolutions to support end users.
  • Analyse and resolve issues relating to interfaces between various system components.
  • Apply ingenuity and creativity in developing enhancements and new areas of functionality.
  • Participate in an out of hours on call rota to provide 24x7 support of the applications.
Qualifications
  • Experience within Application Support, ideally with strong mainframe skills such as COBOL development and tools.
  • Knowledge of COBOL.
  • Experience with OS2200 Unisys mainframe technology.
  • Experience with DMS (hierarchical database) and RDMS (relational database) systems.
  • Understanding of Transaction Processing (TIP/HVTIP) or similar.
  • Comfortable with ITIL framework for service delivery.
  • Strong interpersonal skills and experience communicating regularly with clients.
  • Experience in public sector organisations is welcomed.
Important Information

Candidates must be eligible for, and will be required to obtain and maintain, Counter Terrorist Check (CTC) clearance for this role. Eligibility requires continuous residence in the UK for a minimum of three years. This is a mandatory requirement and cannot be waived.

Benefits
  • Competitive compensation and benefits, including healthcare, retirement plans, and paid time off.
  • Professional development and training opportunities, mentorship programs, and leadership development programs.
  • Industry expertise across financial services, healthcare, government, and transportation.
  • Social responsibility initiatives and sustainability focus.
  • International work opportunities abroad for all employees.
  • Wellbeing & Employee Assistance Program for mental health support.
  • Pension plan.
  • Life Assurance.
  • Private Medical coverage.
  • Option for private dental coverage.
  • Bonus, referral, incentive, and recognition programs.
Equal Opportunity Employer

Unisys is proud to be an equal opportunity employer that considers all qualified applicants without regard to age, caste, citizenship, color, disability, family medical history, family status, ethnicity, gender, gender expression, gender identity, genetic information, marital status, national origin, parental status, pregnancy, race, religion, sex, sexual orientation, transgender status, veteran status or any other category protected by law.

If you are a US job seeker unable to review the job opportunities herein or cannot otherwise complete your expression of interest, please contact our Global Recruiting organization at or call Toll Free: (Prompt 4). US job seekers can find more information about Unisys's EEO commitment here.