22 of 22 Contract Legacy Systems Jobs in London

a strategic initiative transforming treaty reinsurance operations. This role will oversee data migration strategy, planning, execution, and stakeholder engagement for the migration of complex data from legacy systems to the new platform. In this role you will define and lead a comprehensive data migration strategy tailored to reinsurance, ensuring alignment with business goals, IT architecture, and compliance … analysts, reinsurance teams and product specialists to capture and document data requirements. Develop and maintain migration documentation, including data mapping, migration plans, and validation scripts. Review legacy systems and define mapping logic to the target platform, ensuring accurate data migration within the defined scope. Create detailed documentation of migration rules, data lineage, and system changes. Ensure Regulatory … improvement of migration best practices and tools. Validate and Reconcile Data Design and execute validation protocols to confirm completeness and accuracy of migrated data. Reconcile migrated data against source systems and financial ledgers. Support System Testing and UAT Support user acceptance testing (UAT) and post-migration validation to ensure data accuracy and completeness. Deliver training and support to business More ❯

Consultant on a contract basis Seeking a skilled Sage Intacct Consultant to assist with the implementation, configuration, and data migration of the Sage platform as part of an ongoing systems transformation project. This role will bridge the gap between IT operations and business users, ensuring a smooth transition to the new environment. Role The Sage Intacct Consultant will support … and rollout of Sage across the business, working closely with internal stakeholders and external vendors. Assist in data migration activities - cleansing, mapping, validation, and import from legacy systems into Sage. Provide technical and user support, troubleshooting issues during implementation and post-go-live. Work with IT and Finance teams to ensure system integrations, user permissions, and reporting More ❯

specifications that form the golden source for all migration activities. This position bridges business, IT, and development teams to ensure accurate and efficient data transformation from Legacy systems into Avaloq. Responsibilities: Lead the creation of detailed data mapping specifications used by developers to transform data from Legacy to target systems. Engage with IT application owners … to identify golden source systems for key data elements (eg, names, emails, addresses). Define mapping rules to standardise and merge data where inconsistencies exist (eg, field formats, currency representations). Design and document data relationships and record creation logic for Avaloq, including when and how new records should be created. Facilitate workshops and meetings with business and IT More ❯

manipulating data from Salesforce and NetSuite Proficient in SQL and data warehouse development Solid experience with Power BI, including Power Query and DAX Experience working with legacy systems and data migration projects Strong analytical and problem-solving skills HOW TO APPLY: Please register your interest by sending your CV to Mojola Coker via the apply link on More ❯

the design and strategic direction of our next-generation network infrastructure. This role will be pivotal in delivering a multi-year transformation programme focused on replacing legacy systems, enabling cloud-first operations, and fostering inter-trust collaboration. This is a strategic architecture role , not a hands-on implementation or BAU position. Key Responsibilities Strategic Network Architecture Design … Define the target network architecture , supporting cloud-first operations and minimal on-premise infrastructure. Architect solutions optimised for cloud-hosted clinical systems and the Microsoft Fabric analytics platform . Design inter-trust network integration models to enable shared resilience, economies of scale, and collaborative working. Develop a connectivity strategy balancing direct internet access, cloud on-ramps, and secure private More ❯

Responsibilities: Design, code, review, and unit test applications using the Java stack. Collaborate with cross-functional teams, including developers, testers, and DevOps engineers. Support and enhance legacy systems currently in maintenance mode. Contribute to automated testing (C#) and infrastructure improvements (Docker, Ansible, Python, Linux). Required Skills: Proven experience with Java, Spring, Maven, Git, JUnit, and Web More ❯

Responsibilities: Design, code, review, and unit test applications using the Java stack. Collaborate with cross-functional teams, including developers, testers, and DevOps engineers. Support and enhance legacy systems currently in maintenance mode. Contribute to automated testing (C#) and infrastructure improvements (Docker, Ansible, Python, Linux). Required Skills: Proven experience with Java, Spring, Maven, Git, JUnit, and Web More ❯

s committed to making a meaningful impact. The finance department is undergoing a crucial transformation to rebuild a fragile reporting process that has relied heavily on spreadsheets and legacy systems. This is a unique opportunity to contribute your technical expertise to a mission-driven organisation. Your new role As a Senior BI Developer/Senior Data Developer, you More ❯

objectives, progress, and changes. Prepare and deliver stakeholder presentations and communications plans. Identify, document, and manage project risks, dependencies, and issues. Ensure timely identification & mitigation of blockers (e.g., legacy system decommissioning, resource constraints, vendor dependencies) Lead change management activities, including CAB submissions, user communications, and training. Develop user guides and documentation to support end-user readiness and adoption. More ❯

Patient journeys and Staff journeys Excellent communication skills Exceptional Stakeholder Management skills Flexible approach towards onsite working (minimum 3 days per week) Nice to have: Working knowledge of CRM systems and ability to refine requirements (ie MS Dynamics) Experience of working on Programmes relating to legacy systems, mapping out what to keep etc Experience of working More ❯

Patient journeys and Staff journeys Excellent communication skills Exceptional Stakeholder Management skills Flexible approach towards onsite working (minimum 3 days per week) Nice to have: Working knowledge of CRM systems and ability to refine requirements (ie MS Dynamics) Experience of working on Programmes relating to legacy systems, mapping out what to keep etc Experience of working More ❯

you will be responsible for: Design and implement AWS architectures Lead the design and delivery of AWS-based, cloud-native data platforms. Drive data modernisation, migrating legacy systems to scalable cloud solutions. Collaborate with architects and stakeholders to align with enterprise strategy. Act as a technical liaison between Delivery and Client teams. Support proposals and solution design More ❯

Outside IR35) Start Date: ASAP Overview: We’re supporting a major public-sector organisation delivering a large-scale Command & Control (C&C) transformation programme — replacing legacy systems with a modern, integrated solution that will significantly enhance operational capability across critical services.This role will lead the Service Design, Introduction, and Transition workstream, ensuring that new technology and processes More ❯

. Responsibilities: Design robust integration solutions across commercial, HR, and data platforms within a complex, multi-brand retail environment Lead architectural planning for the decommissioning of legacy systems, ensuring smooth transitions to modern, scalable services Define and document integration standards, including API strategies, event schemas, and interface contracts to enable decoupled, reusable services Implement event-driven architectures … in enterprise system integration, including legacy system transformation and platform modernisation Hands-on experience with integration technologies, including Kafka (or similar event streaming platforms), Java-based backend systems, and service orchestration Strong proficiency in API design (REST/GraphQL), microservices architecture, and middleware solution Deep understanding of data flow, interface management, and end-to-end process mapping More ❯

level. You'll be supporting a broad range of IT infrastructure, including user management, account administration, mobile device support, networking, cloud services, end-user computing (EUC), and some legacy systems. What We're Looking For: Proven experience in technical support roles. Understanding of virtual desktop environments and cloud services. Experience with Mobile Device Management (MDM). Strong troubleshooting More ❯

integrations sub-workstream from the ground up. This role is critical for technical readiness, involving the design of integration patterns that will connect Workday with crucial internal and external systems across HR, Finance, and Payroll. The Role: End-to-End Integration Strategy & Delivery You will report directly to the Senior Technical Delivery Manager, acting as the primary authority for … Studio, EIB, Core Connectors, PECI, and APIs . Middleware Expertise: Leverage experience with middleware platforms (e.g., MuleSoft, Boomi, Azure Integration Services) to connect Workday to third-party and legacy systems. Delivery Management: Oversee the build, testing, and secure deployment of multiple integrations in parallel, collaborating closely with IT and external vendors. Compliance: Produce technical artefacts (interface inventory, data … processes. Strong stakeholder management with IT, vendors, and business owners. Desirable: Previous experience in the Public Sector or regulated industries. Exposure to hybrid ecosystems where Workday coexists with legacy systems. Next Steps This is an Inside IR35 contract with a high likelihood of extension. If you are an SC Cleared Workday Integration Lead with the required greenfield experience More ❯

regulated environments. Key Responsibilities: Define and lead enterprise API strategy and architecture Drive API adoption and governance across teams Ensure secure, scalable integration with legacy and cloud systems Maintain compliance with financial regulations Monitor and optimise API performance and developer experience Experience Required: Proven leadership in large-scale API programmes Expertise in REST, OAuth2, OpenAPI, and API More ❯

regulated environments. Key Responsibilities: Define and lead enterprise API strategy and architecture Drive API adoption and governance across teams Ensure secure, scalable integration with legacy and cloud systems Maintain compliance with financial regulations Monitor and optimise API performance and developer experience Experience Required: Proven leadership in large-scale API programmes Expertise in REST, OAuth2, OpenAPI, and API More ❯

lead a new cloud modernisation programme within the government sector. This is a strategic leadership role where you'll shape the approach to transforming legacy on-premise systems to modern public cloud infrastructure. What You'll Be Doing Leading the strategy and execution of on-premise to cloud migration programmes Shaping new technology modernisation work-streams from … end technology transformation life-cycles Navigating government commercial frameworks and procurement processes Understanding and managing dependencies across operational support and outsourcing Applying modern practices (DevOps, SecOps, Agile) to legacy system modernisation Essential Experience Technical Proven experience leading cloud modernisation projects (on-premise to public cloud) Strong understanding of public cloud platforms (AWS, Azure) Experience with legacy More ❯

Datapower Developer , you will be working closely with the technical team on development and implementation journeys. The role is centered on enabling and securing data flows between various enterprise systems, including mobile applications, cloud services, and legacy mainframe systems click apply for full job details More ❯

Datapower Developer , you will be working closely with the technical team on development and implementation journeys. The role is centered on enabling and securing data flows between various enterprise systems, including mobile applications, cloud services, and legacy mainframe systems. Your Responsibilities: Provide expert support and timely resolution of environmental issues related to the project, focusing on DataPower … to Python, Shell scripting, GitLab pipeline. Your Profile Essential Skills/Knowledge/Experience: Proven experience in IBM DataPower development, configuration, and troubleshooting within enterprise environments. Familiarity with mainframe systems and integration with DataPower where applicable. Good working knowledge of AWS services, particularly CloudWatch, DynamoDB, and Lambda, including monitoring, troubleshooting, and optimisation. Excellent verbal and written communication skills to More ❯

government environment. This role will focus on the pilot design and delivery of a critical new system, with the potential to extend into the redesign of a further 9 systems based on pilot success. This is a unique opportunity for a user-centred design expert who can confidently operate in secure, fast-paced environments, working at the intersection of … usability standards. Required Experience & Skills: Proven experience as a Senior UX Designer or UX-focused Business Analyst in government, defence, or secure environments. Experience designing for complex or legacy enterprise systems. Strong proficiency in UX tools such as Figma, Adobe XD, Sketch, or Axure. Demonstrable experience running user research sessions and usability testing. Deep understanding of user-centred More ❯