Mainframe Application Developer & Support Engineer (COBOL)

This is a full-time, permanent position for a Mainframe Application Developer & Support Engineer (COBOL) in a hybrid working model, requiring on-site attendance at least three days per week in Milton Keynes.

We partner with major organisations across Financial Services, Communications, Media, Commercial, Transportation, and the Public Sector, delivering a broad portfolio of business solutions-including consulting, systems integration, outsourcing, network services, security, and enterprise-class technologies.

Within our Managed Application Services function, we provide 24/7 support for mission-critical applications. We are now seeking a skilled professional to join the team responsible for supporting and enhancing Command-and-Control services for our client. This role focuses primarily on the mainframe component of the solution, providing day-to-day operational support alongside software enhancements defined by the client.

Key Responsibilities

• Identify issues and propose effective resolutions to support end users

• Analyse and resolve problems relating to interfaces across multiple system components

• Apply creativity and technical insight to deliver enhancements and new areas of functionality

Do you have experience in Scripting?, * Strong experience in COBOL and mainframe application development

• Experience of OS2200 Unisys mainframe technology

• Proven background in supporting and maintaining mainframe operational systems

• Solid understanding of batch processing, JCL, and mainframe utilities

• Strong SQL or database scripting knowledge (mainframe or equivalent)

• Experience debugging, troubleshooting, and analysing complex system interactions

• Familiarity with structured development practices and Agile methodologies

• Eligible to obtain UK Security Clearance (must meet residency requirements)

Preferred:

• Experience working within large-scale, mission-critical environments

• Exposure to integration between mainframe and distributed systems

• Understanding of modern development and support frameworks

• Ability to mentor junior team members and support continuous improvement

• Experience in Public Safety/Emergency Services would be highly advantageous

Additional Information

• This is a full-time, permanent role.

• You will be required to attend our site at least three days per week and therefore must live within commutable distance from Milton Keynes.

• Candidates must have resided in the UK for a minimum of three years to qualify for security clearance. This requirement is non-negotiable. You must be able to obtain and maintain the appropriate security clearance for this role.