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 ...

Experience: Proven delivery of data migration initiatives in banking environments Experience specifically within payments platforms or similarly critical transaction systems IBM DB2 on Mainframe (Strong Expertise Required): Indexing, clustering, partitioning, and archiving strategies Query optimisation in high-volume, high-throughput environments Large-Scale Systems Experience: Experience working with large, high ...

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 ...

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 ...

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 ...

currently supporting a major global banking client in the build-out of their core Mainframe infrastructure team and are looking to engage experienced IBM Mainframe professionals across a number of specialist areas. This is an opportunity to join a large-scale enterprise environment, working on a complex and business-critical …/OS estate supporting high-volume, mission-critical systems. We are interested in speaking with contractors with strong Mainframe infrastructure experience, particularly within z/OS environments, across areas such as Systems Programming, Automation, CICS, DB2 and Storage. Key Responsibilities: Provide hands-on support and engineering across IBM z/ ...

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 ...

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 ...

Rate Inside IR35 Remote, with occasional travel to London, Manchester, Newcastle Role Purpose The Principal Engineer will provide senior technical leadership for a complex mainframe modernisation programme characterised by a large case load, high throughput, and significant scalability and resilience requirements. The role is accountable for shaping and assuring solution … including Kubernetesbased platforms. Deep handson experience with Java, Spring Boot, and Node.js, building scalable and resilient backend services. Experience modernising or integrating with mainframe or legacy enterprise systems in highvolume environments. Proven ability to enforce engineering standards and operate effectively within highgovernance, regulated, or public sector contexts. Strong understanding ...

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 ...