8 of 8 Mainframe Developer Jobs in the UK

Role: Mainframe Developer Start Date: ASAP – 19/12/25 Contract Length: 3 Months Work Location: Remote IR35 Status: Outside IR35 Join a critical public sector transformation project focused on decommissioning legacy mainframe systems. Urgently seeking an experienced Mainframe Developer with strong ICL VME & COBOL skills to support the migration of essential services (including … payroll) off mainframe before an end-of-year deadline. Key Responsibilities: Reverse-engineer and interpret ICL VME mainframe applications written in COBOL Support the migration of codebases into Windows DLL equivalents Work with existing scripts to ensure functionality is retained and transitioned effectively Provide technical expertise in legacy systems decommissioning Collaborate with internal teams to troubleshoot and validate … transitions in a high-pressure, time-sensitive environment Assist in GNU-based IBM tooling if experienced Skills & Experience Required: Strong hands-on experience with ICL VME mainframe systems Strong expertise in COBOL, analysing and reworking legacy business logic Understanding of mainframe-to-modern transitions Desirable: Experience with GNU on IBM environments Public sector experience More ❯

System Analyst/Mainframe Developer Initial 6 Month Contract Hybrid Monthly visit to Lytham £500-£520pd (Outside IR35) We are currently seeking a skilled System Analyst/Mainframe Developer with proven experience in IBM z-series mainframe technologies. The ideal candidate will have a strong understanding of PL1, SYNCSORT, DB2, IMS DB, MVS JCL, TSO … JobTrac, ENDEVOR, and File Manager. Role Requirements: Experience interrogation of mainframe applications built in the above technologies to support data mapping (e.g., Source to Target data fields). Proven experience in developing codebases in the specified technologies to undertake data extracts based on agreed specifications. Experience in large-scale migration programmes is advantageous. Background in Life, Protection, or Insurance More ❯

Mainframe Developer (PL1/DB2) 6 months Lytham - x1 day a week or x1 every 2 weeks Outside IR35 Role Requirements: Knowledge/demonstrable proven recent experience using the following technologies - IBM z-series mainframe - PL1, SYNCSORT, DB2, IMS DB, MVS JCL, TSO, JobTrac, ENDEVOR, File Manager Prior experience in projects/programmes demonstrating experience in interrogating … mainframe applications built in the above technologies to support data mapping (e.g. Source to Target data fields) Prior experience of development of codebase in the above technologies in order to undertake data extracts working from agreed specifications Prior experience in large scale migration programmes advantageous Prior experience in a Life/Protection role advantageous All profiles will be reviewed More ❯

Mainframe Developer (PL1/DB2) 6 months Lytham - x1 day a week or x1 every 2 weeks Outside IR35 Role Requirements: Knowledge/demonstrable proven recent experience using the following technologies - IBM z-series mainframe - PL1, SYNCSORT, DB2, IMS DB, MVS JCL, TSO, JobTrac, ENDEVOR, File Manager Prior experience in projects/programmes demonstrating experience in interrogating … mainframe applications built in the above technologies to support data mapping (e.g. Source to Target data fields) Prior experience of development of codebase in the above technologies in order to undertake data extracts working from agreed specifications Prior experience in large scale migration programmes advantageous Prior experience in a Life/Protection role advantageous All profiles will be reviewed More ❯

Role: Mainframe Developer Contract Length: 6 months – extensions available, project runs until 2027 Work Location: Hybrid Remote/Lancashire Start Date: ASAP Industry: Financial Services/Insurance IR35 Status: Outside IR35 Seeking a skilled Systems Analyst/Developer to join a major two-year migration and separation programme. The project focuses on migrating a portfolio from legacy … mainframe systems to a new outsourced platform model. This is a hands-on role suited to someone with deep IBM mainframe expertise who can hit the ground running. Responsibilities: Analyse and interrogate legacy mainframe applications to support source-to-target data mapping Play a critical role in build phase, developing code and executing data extracts based on … client specifications Develop code in IBM z-series mainframe technologies to extract data Work from agreed specs to support the data migration and build activity Support testing and validation phases in a waterfall-esque delivery model Collaborate with Solution Architects and Programme Leads to influence and adapt build scope as needed Active participation in daily stand-up calls with More ❯

in the pursuit of innovation! The IZOT product line includes BMC's Intelligent Z Optimization & Transformation products, which help the world's largest companies to monitor and manage their mainframe systems. The modernization of mainframe is the beating heart of our product line, and we achieve this goal by developing products that improve the developer experience, the … mainframe integration, the speed of application development, the quality of the code and the applications' security, while reducing operational costs and risks. We acquired several companies along the way, and we continue to grow, innovate, and perfect our solutions on an ongoing basis. BMC Software is looking for a Senior Product Developer to join our dynamic development team … and z/OS Processing Environment. Extensive development experience using 64-bit Assembler and 31-bit Assembler programming languages. Experience with C, REXX, Python is a plus Experience with Mainframe environment (TSO/ISPF, JCL etc) , IBM Mainframe z/OS internals (JES2, SMS, HSM); z/OS communications TCP/IP and VTAM and IBM Utilities (IEBGENER More ❯

IBM Cobol Natural Developer - West Yorkshire (3 days a week office based) £340 per day - outside IR35 Experienced IBM Mainframe Cobol Natural Developer required for new development, enhance and support work. You will support your team's work as well as independently create and finalize all the code on multiple small projects. Key skills: IBM Cobol DB2 … Natural Adabas JCL Strong programming skills in Mainframe technologies in both a batch and online environment IBM Cobol Natural Developer - West Yorkshire (3 days a week office based More ❯

in the pursuit of innovation! The IZOT product line includes BMC's Intelligent Z Optimization & Transformation products, which help the world's largest companies to monitor and manage their mainframe systems. The modernization of mainframe is the beating heart of our product line, and we achieve this goal by developing products that improve the developer experience, the … mainframe integration, the speed of application development, the quality of the code and the applications' security, while reducing operational costs and risks. We acquired several companies along the way, and we continue to grow, innovate, and perfect our solutions on an ongoing basis. BMC is looking for a Lead Assembler Developer to join our amazing IZOT team! In … and 31-bit Assembler programming languages. Coding experience in a multitasking, reentrant and/or sysplex environment. Experienced creating functional designs/specifications from business requirements. Experience with IBM Mainframe environment (TSO/ISPF, JCL etc.). Excellent knowledge of z/OS structure and logic including knowledge of z/OS operating system internals. Experience in developing working More ❯