15 of 15 Mainframe Jobs in London

Mainframe Engineer Hybrid Working – London – 2 days a week on site. Financial Services Lorien's leading banking client is looking for a n experienced Mainframe Engineer, this person will support the test environments to enable delivery of features to mobile/online banking customers. The person will have hands … experience with Mainframe Technologies such as CICS and DB2, along with an understanding of AWS Services This role is based in London. This role will be Via Umbrella. Working in a Hybrid Model of 1 day a week on site. Key Responsibilities: Provide expert support and timely resolution of environment ...

live. Mandatory Skills & ExperienceHands-On Experience Delivering data migration in banking environments, specifically within payments or similarly critical transaction systemsIBM DB2 on Mainframe Strong Expertise Required Indexing, clustering, partitioning and archiving- Query optimisation in high-volume environmentsLarge Scale Systems Experience Working with high-throughput systems where data extraction must ...

Mainframe System Automation Engineer - Finance - Nottingham Day rate: £500 - £700 (inside IR35) Duration: 3 - 6 months Start: ASAP My client is looking for an experienced Mainframe Automation & Output Management Specialist to provide expert-level support across mainframe automation and output management systems. The role involves developing automation solutions, supporting monitoring … tools, and ensuring system reliability in a complex enterprise environment. Key Responsibilities Provide expert support for mainframe automation and output management systems Develop and maintain dashboards and alerts using Splunk Author and execute test cases to validate new and existing functionality Handle automation-related problem escalations, including vendor coordination Represent ...

SWIFT, MQ, scheme interfaces) Message transformation and routing (MT/MX handling) Core payment engines and processing logic Reconciliation and downstream processing Familiarity with mainframe-integrated architectures is highly desirable Migration & Legacy Experience Experience working in complex legacy environments Ability to reconcile documented vs real system behaviour Strong understanding ...

solutions team focused on transforming legacy systems into scalable, cloud-native architectures. This role involves designing and delivering end-to-end modernization strategies across mainframe, midrange, and distributed environments for global enterprise clients. Key Responsibilities Architect and deliver modernization solutions leveraging latest tools and platforms , including: AWS Mainframe Modernization Service … Agentic AI-driven modernization accelerators for intelligent code conversion, dependency mapping, and automated testing. Independent Software Vendor partner technologies for modernization Design architectures incorporating: Mainframe ‘In-place modernization and optimization’ , and Mainframe ‘Exit-to-Cloud’ Event-driven architectures (AWS EventBridge, Apache Kafka, IBM MQ) for real-time integration and decoupling. ...

Architect to spearhead a high-stakes transition of their core transaction engine. You will essentially be the primary architect bridging the gap between legacy mainframe foundations and modern target p click apply for full job details ...

Urgent contract opportunity with a leading German client for a Mainframe Modernization Specialist , working remotely from the UK (aligned to German business hours). Role Overview: Location: Remote (UK-based) Contract: Inside IR35 Start: Immediate Key Requirements: Strong experience in mainframe re-hosting/modernization Hands-on migration of COBOL ...

Data Migration Architect to lead data architecture and migration activities across a complex payments transformation programme. This role requires strong expertise in payments systems, mainframe data environments, and migration execution across critical transaction platforms. The successful candidate will own the data architecture bridging legacy mainframe systems and target platforms, defining … mappings, extraction strategies, controls, reconciliation, and migration assurance. Key Responsibilities Data Architecture & Migration Strategy Own end-to-end data architecture between mainframe and target platforms. Define source-to-target mappings and transformation logic. Establish migration controls, governance, and validation processes. Lead data migration planning, rehearsals, and cutover readiness. Mainframe Data ...

Urgent contract opportunity with a leading German client for a Mainframe Modernization Specialist , working remotely from the UK (aligned to German business hours). Role Overview: Location: Remote (UK-based) Contract: Inside IR35 Start: Immediate Key Requirements: Strong experience in mainframe re-hosting/modernization Hands-on migration of COBOL ...

Delivery Manager - Mainframe Modernisation Contract | Initial 6 months | Inside IR35 | £500 per day We're looking for a hands-on Delivery Manager to support a large-scale mainframe modernisation and exit programme, targeting full decommissioning by late 2029/early 2030. This is a delivery-focused role suited to someone … across complex technical landscapes, and driving progress across multiple teams. The Role You'll support a major programme to modernise and retire a legacy mainframe estate spanning supply chain, logistics, finance and people systems. The work includes accelerating existing decommissioning plans, standing up new refactoring workstreams, and helping the business ...

Legacy Systems & Technical Architecture Work within legacy and non-standard environments. Reconcile documented versus actual production behaviour. Deliver practical solutions within technical constraints. Support mainframe-integrated messaging architectures and MT/MX transformation layers. Stakeholder Management Collaborate with SMEs, engineering teams, operations, and programme leadership. Document architecture decisions, assumptions, dependencies … understanding of real-world payment lifecycles and production flows. Experience with legacy systems and constrained environments. Strong communication and stakeholder engagement skills. Desirable Skills Mainframe integration experience IBM MQ/Messaging Middleware MT/MX message standards High-volume transaction systems Large-scale transformation programmes TekWissen® Group is an equal ...

Architect to spearhead a high-stakes transition of their core transaction engine. You will essentially be the primary architect bridging the gap between legacy mainframe foundations and modern target platforms. This ideal candidate for this role will be someone who understands the granular detail of how a message moves from … Essential Skills UK Payment Rails: Expert-level BACS & Faster Payments (FPS) . Global Messaging: SWIFT & SEPA mastery, including ISO 20022 (MT/MX) . Mainframe Core: IBM DB2 specialist (Query Optimisation, Partitioning, Archiving). Data Migration: Hands-on Extraction , Mapping , and Lineage for high-throughput systems. Risk & Governance: CASS ...

Architect to spearhead a high-stakes transition of their core transaction engine. You will essentially be the primary architect bridging the gap between legacy mainframe foundations and modern target platforms. This ideal candidate for this role will be someone who understands the granular detail of how a message moves from … Essential Skills UK Payment Rails: Expert-level BACS & Faster Payments (FPS) . Global Messaging: SWIFT & SEPA mastery, including ISO 20022 (MT/MX) . Mainframe Core: IBM DB2 specialist (Query Optimisation, Partitioning, Archiving). Data Migration: Hands-on Extraction , Mapping , and Lineage for high-throughput systems. Risk & Governance: CASS ...

part in transitioning legacy platforms to new architectures while minimising risks to business-critical payment processing. Key Responsibilities: Own data and technical architecture bridging mainframe and target platforms Define data mappings, extraction approaches, and migration controls Support safe, controlled execution of payments migrations within regulated environments Identify, document, and escalate … standard implementations Ability to reconcile documented designs with actual system behaviour Comfortable delivering within constraints rather than ideal-state redesigns Technical Familiarity Mainframe-integrated architectures Messaging technologies such as IBM MQ and MT/MX translation layers Communication & Stakeholder Management Ability to engage confidently with subject matter experts, engineers ...

need a specialist who understands that migrating a payment engine is a high-wire act. You will own the bridge between our legacy Mainframe and target platforms, ensuring that every message from legacy MT to modern MX flows with 100% integrity. Core Responsibilities Architectural Ownership: Lead the "Strangler Fig" migration … enforce CISA-aligned audit frameworks and CASS regulatory controls to ensure zero-loss migration. Pragmatic Legacy Integration: Navigate the "documented vs. actual" reality of Mainframe systems, building executable solutions within existing technical constraints. Technical Requirements Payments Flow Expertise: Ability to demonstrate design leadership across the full lifecycle: Gateway/Connectivity ...