1 to 25 of 29 Contract Legacy Systems Jobs in London

Overview The client is seeking a mid-to-senior level contractor with strong backend and infrastructure development experience. The successful candidate will work on maintaining and upgrading a legacy Java/Oracle system, collaborating with existing developers to gain domain knowledge and contribute to modernisation efforts using cloud-based technologies. Key Responsibilities * Maintain and enhance a monolithic Java … skills and a passion for working with data * Be comfortable working with legacy Oracle PL/SQL code and motivated to improve it * View legacy systems as an opportunity to gain valuable domain knowledge * Embrace 3rd line support responsibilities and seek ways to automate and improve support processes * Be proficient in test-driven development and More ❯

Role OverviewThe client is seeking a mid-to-senior level contractor with strong backend and infrastructure development experience. The successful candidate will work on maintaining and upgrading a legacy Java/Oracle system, collaborating with existing developers to gain domain knowledge and contribute to modernisation efforts using cloud-based technologies. Key Responsibilities* Maintain and enhance a monolithic Java … skills and a passion for working with data* Be comfortable working with legacy Oracle PL/SQL code and motivated to improve it* View legacy systems as an opportunity to gain valuable domain knowledge* Embrace 3rd line support responsibilities and seek ways to automate and improve support processes* Be proficient in test-driven development and 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 ❯

stakeholders across Finance, Supply Chain, HR, and Operations to identify and scope data science opportunities within oneAdvanced. • Design, develop, and deploy ETL strategy, design and executive to migrate Legacy finance data to Target. • Design, develop, and deploy predictive and prescriptive models (e.g., demand forecasting, anomaly detection, risk scoring, financial optimisation). • Build and manage end-to-end data … Data Factory, Synapse, Dataverse, and Power BI. • Partner with oneAdvanced functional leads to enhance reporting, analytics, and automation capabilities. • Cleanse, transform, and integrate data from oneAdvanced, legacy systems, and external data sources into central data platforms (EDW/Azure). • Implement machine learning use cases such as cashflow forecasting, working capital optimisation, fraud detection, and HR analytics. More ❯

deploy, and support enterprise CRM software (based on Microsoft Dynamics 365) Collaborate with functional consultants to translate business requirements into technical configurations Perform data migration from legacy systems using SQL tools Create and maintain technical documentation and reports Test software releases and contribute to continuous improvement initiatives Provide second-line technical support and assist in resolving complex More ❯

testing support. Assist users in understanding application functionality and workflows. Review and approve solution designs, configuration workbooks, and test plans. Support data integration and migration from Legacy systems to Oracle Cloud. Troubleshoot issues and liaise with Oracle Support as needed. Develop custom reports and dashboards using tools like BIP and OTBI. Essential Skills & Experience Proven experience in More ❯

testing support. Assist users in understanding application functionality and workflows. Review and approve solution designs, configuration workbooks, and test plans. Support data integration and migration from legacy systems to Oracle Cloud. Troubleshoot issues and liaise with Oracle Support as needed. Develop custom reports and dashboards using tools like BIP and OTBI. Essential Skills & Experience Proven experience in More ❯

in the office eligibility to work in the UK Role Overview We are seeking a skilled Senior Developer to join a newly formed engineering team focused on removing legacy components and addressing technical debt within our Media Services products. This role will involve working closely with stakeholders to understand system requirements, designing robust replacement components, and implementing them … development (TDD) is essential, as is hands on experience in component migrations. A proactive and detail-oriented approach will be vital to ensure smooth transitions from legacy systems to scalable, reliable, and future-proof solutions. In addition, experience with software testing practices, Agile methodologies (Scrum or Kanban), and defensive programming techniques will be highly desirable. We are … looking for someone who thrives in collaborative, fast-paced teams, who can balance technical precision with delivery deadlines, and who is motivated by the challenge of modernising complex systems to drive efficiency and long-term sustainability. Essential Key Skills and Responsibilities You will have: Good working experience with continuous integration and continuous delivery (CI/CD) AWS CodePipeline expertise More ❯

lead critical data migration activities within this well-respected organisation. As the Data Migration Specialist, you will take ownership of designing and executing data migrations from legacy systems, developing standardised ETL packages using Azure Data Factory. You'll be responsible for ensuring data quality, accuracy, and integrity throughout the migration process, while establishing robust processes and documentation … overall integration strategies and business objectives. We are looking for: Extensive experience in ETL development using SQL, Azure Data Factory, Synapse Pipelines, and Stored Procedures Proven experience in legacy data migration and ERP implementations, including at least two full life cycle implementations in a Data Analyst role Strong SQL and SSIS experience It would be a bonus if 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 ❯

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 ❯

critical project with a high-profile Government Client . This is a key technical role focusing on a vital component of the client's technology landscape: migrating a legacy message queueing system to a modern, scalable platform click apply for full job details More ❯

initiatives alongside Data Management (inclusive of data journeys, analysis, integration and migration) The Business Analyst will support the end-to-end migration of data from legacy NAS systems to a modern Data Centre infrastructure. This role involves working closely with technical teams, stakeholders, and project managers to ensure a smooth, secure, and efficient transition of data assets. More ❯

gather requirements and define scalable solutions. Facilitate workshops, CRP, SIT, and UAT sessions across European business units. Integration & Data Migration Oversee integrations with Oracle Cloud modules and external logistics systems using OIC, REST APIs, and web services. Manage FBDI/ADFDI-based data migration from Legacy systems. Reporting & Analytics Develop OTBI and BI Publisher reports for order More ❯

businesses. Our people, with deep-rooted expertise and specialist knowledge, are the driving force behind our end-to-end solutions, which are also backed by our enduring global Legacy and advanced capabilities. This combination puts us in a unique position to meet the evolving needs of our customers and guide them confidently through their digital transformation, as a … tailored to client needs. Designing and testing D365 Business Central customisations and supporting client acceptance. Participating in go-live cutover exercises and ensuring data is reconciled back to Legacy systems. Guiding projects with daily communication with customers or project managers. Participating in design and architecting sessions with fellow consultants. Supervising and mentoring junior consultants to support their development. More ❯

critical project with a high-profile Government Client . This is a key technical role focusing on a vital component of the client's technology landscape: migrating a legacy message queueing system to a modern, scalable platform. ?? Key Requirements & Scope: The core objective of this role is to replace the existing IBM MQ Series with Kafka across the … expertise in Java (Backend Development). Strong, hands-on experience with Kafka (implementation, configuration, and integration). Essential knowledge of IBM MQ Series (or similar legacy messaging systems) to facilitate a seamless transition and integration. Ability to work in a fast-paced environment and deliver solutions to high government standards. Essential Criteria: Active SC (Security Check) Clearance More ❯

to cloud migration projects and shape new technology transformation workstreams. The Role Lead cloud modernisation projects (on-premise to public cloud) End-to-end life cycle management and legacy system transformation Navigate government commercial frameworks and procurement Work on new initiatives from inception with team of 5 Essential Skills Cloud modernisation experience (AWS/Azure) - disqualifying if absent … Legacy technology transformation (VMware, Hyper-V, Oracle) Government sector experience (almost essential) Agile delivery and digital service modernisation Strategic thinking with technical depth The Details Rate: £675/day inside IR35 Duration: 6 months Location: London/Bristol/Manchester (any location, flexible working) Clearance: BPSS minimum, SC preferable More ❯

to cloud migration projects and shape new technology transformation workstreams. The Role Lead cloud modernisation projects (on-premise to public cloud) End-to-end life cycle management and legacy system transformation Navigate government commercial frameworks and procurement Work on new initiatives from inception with team of 5 Essential Skills Cloud modernisation experience (AWS/Azure) - disqualifying if absent … Legacy technology transformation (VMware, Hyper-V, Oracle) Government sector experience (almost essential) Agile delivery and digital service modernisation Strategic thinking with technical depth The Details Rate: £675/day inside IR35 Duration: 6 months Location: London/Bristol/Manchester (any location, flexible working) Clearance: BPSS minimum, SC preferable 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 ❯

governance are adhered to. Compliance and Data Privacy: Ensure adherence to regulatory requirements, corporate policies, and industry standards throughout the program lifecycle. Oversee the deployment of customer consent management systems to ensure data privacy compliance. Risk and Issue Management: Identify potential risks and proactively develop mitigation strategies. Resolve project issues in a timely and effective manner to minimize disruption … via SAP or SAP S/4HANA Procurement. SAP IBP (Integrated Business Planning) solutions for demand planning, supply network collaboration, and S&OP alignment. Migrated legacy procurement systems to SAP S/4HANA, addressing data model changes (e.g., Material Ledger, MRP Live) and FI/CO integration. Streamlined supply chain workflows via SAP PP (Production Planning), QM … Logistics Execution) modules. Led cross-functional teams using Agile and SAP methodologies, ensuring alignment with business KPIs (OTIF, cost savings). Integrated SAP SCM with third-party logistics (3PL) systems, IoT platforms, and ERP modules (SD, FI, CO) for real-time visibility. Mitigated risks in global supply chains via SOX compliance, customs management (GTS), and sustainability reporting. Bridging procurement 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 ❯

We are seeking an Energy Migration Senior Data Analyst to join our Home Services Energy Data Team to assist with the migration of our Energy Portfolio from UW legacy application to Gentrack Junifer. This is an exciting opportunity to contribute to a major data migration project in an award winning energy provider and UK FTSE 250 company. Please … consider fixed term or day rate contract - please indicate your preference in your application. The migration work will have two parts: a) Migration of portfolio from our UW legacy CRM system to Gentrack. b) Build extract scripts to pull data from Gentrack Junifer database and load the data into UW BigQuery data warehouse to assist with management, regulatory 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 ❯