23 of 23 Contract Legacy Systems Jobs in London

needs. Own the delivery of direct digital product journeys , ensuring seamless experiences with high conversion rates. Drive digital transformation by modernising legacy systems and integrating them into scalable, customer-centric platforms. Select and collaborate with engineering teams to ensure robust technical solutions and efficient delivery. Design … Senior Product Owner in financial services or fintech with significant experience of Mobile Applications/APPs and Portals Strong understanding of legacy systems and experience delivering digital transformation programmes, ideally within customer portals. Solid technical knowledge of software delivery, APIs, and system integration . Deep expertise ...

international membership organisation operating within the healthcare education and research sector. This forward-thinking not-for-profit organisation is seeking an experienced Digital Systems Manager to join them during an exciting period of digital transformation. About the Organisation As a multidisciplinary membership organisation, they champion research, education, and knowledge … providing online learning resources to members worldwide. The role The organisation has invested significantly in digital infrastructure over recent years, replacing legacy systems with a modern, integrated tech stack centred around Salesforce and Fonteva. They have built a sophisticated member portal, integrated online payment systems ...

functional testing using Azure Devops, XRAY and JIRA. It also includes defect tracking and management. Regression, Functional, emergency change and defect testing across systems in production. API testing, data validation, and batch process testing to ensure end-to-end system integrity. Designing and maintaining a test results dashboard … Framework/.NET Core, HTML/CSS/TypeScript/React, Python, SQL Server, Oracle). The role focuses on refactoring legacy systems to reduce technical debt, improve reliability and performance, and embed modern security patterns across the service estate. In addition, the engineer will contribute ...

side and client-side applications using .NET Framework/Core , React/TypeScript , and relational databases ( SQL Server , Oracle ). Refactor legacy systems to reduce technical debt and improve performance. Implement modern security patterns (OAuth2/OpenID Connect, OWASP principles). Optimise database queries and schemas; ensure ...

experience in Change Data Capture (CDC). The candidate will design and implement robust data migration strategies, ensuring seamless integration between legacy systems and modern cloud-based architectures. Responsibilities Architect CDC Pipelines: Design and optimize Change Data Capture workflows (IBM CDC or equivalent), including subscription design, bookmarks ...

looking for a senior C# Developer with a strong architectural focus to join a highly skilled engineering team working on business-critical systems at scale . This role sits at the heart of a major technology estate and offers the chance to modernise legacy platforms , shape technical … Doing Designing and developing applications using .NET Framework/.NET Core , React/TypeScript , Python , and relational databases Refactoring and modernising legacy systems to reduce technical debt and improve performance and reliability Embedding modern security patterns across APIs and services (authentication, authorisation, OWASP controls, secure access) Contributing ...

Data Migration Officer will play a key role in ensuring the accurate and secure migration of HR and payroll data from legacy systems into the new HCM platform. You will work closely with HR, technology teams, third-party suppliers, and a dedicated project team to deliver high ...

Framework/.NET Core, HTML/CSS/TypeScript/React, Python, SQL Server, Oracle). The role focuses on refactoring legacy systems to reduce technical debt, improve reliability and performance, and embed modern security patterns across the service estate. Tasks Design, build, and maintain server-side … TypeScript, Python, and relational databases (SQL Server, Oracle); contribute to API and UI development, data access layers, and integration points. Refactor and modernise legacy codebases: modularisation, dependency updates, performance tuning, improved observability, and raising automated test coverage within CI/CD. Embed modern security patterns and controls across ...

Role Define and validate the meaning, structure, and shape of target datasets Quantify and assess data quality issues across legacy systems Translate data anomalies into clearly defined and agreed business rules with stakeholders Essential Skills & Experience Assess data completeness, validity, consistency, and uniqueness, and interpret what issues … verify transformation results Geospatial & Public Data Experience Proven experience working with geospatial data , including spatial formats (e.g. vector, raster, GeoJSON, shapefiles), coordinate reference systems, and spatial analysis workflows Strong ability to interpret and apply geographical context within data processing pipelines Demonstrated experience identifying local or regional geospatial insights ...

North London is seeking a highly experienced Interim Data Modeller to design and implement a global finance and HR data model spanning multiple source systems . This is a pure data modelling role . The focus is on structure, consistency, and correctness of data, not reporting, dashboards, or downstream … across geographies, entities, and systems. Key responsibilities include: Designing and owning global canonical data models for Finance and HR Integrating data from multiple source systems (ERP, HRIS, payroll, planning tools) Defining conformed dimensions, facts, hierarchies, and reference data Resolving data conflicts across regions, entities, and legacy systems ...

heavily investing in modernising its data landscape to become a fully data-driven organisation. This includes migrating away from traditional legacy systems and adopting scalable, cloud-native data platforms. Within this context, the Risk Foundations Platform plays a critical role. The platform's vision is to design … enterprise-grade data products that enhance risk modelling, reporting, and regulatory compliance. A key strategic priority for the team is the decommissioning of legacy data stores and replacing them with modern, cloud-based capabilities that are fully owned and managed within the platform. Programme Focus The programme focuses ...

North London is seeking a highly experienced Interim Data Modeller to design and implement a global finance and HR data model spanning multiple source systems . This is a pure data modelling role . The focus is on structure, consistency, and correctness of data, not reporting, dashboards, or downstream … across geographies, entities, and systems. Key responsibilities include: Designing and owning global canonical data models for Finance and HR Integrating data from multiple source systems (ERP, HRIS, payroll, planning tools) Defining conformed dimensions, facts, hierarchies, and reference data Resolving data conflicts across regions, entities, and legacy systems ...

rollout of a new digital technology platform. This is a high-profile assignment within a complex operational environment, supporting the transition from a legacy system to a modern, real-time solution used across the entire business. You will act as the primary interface between the programme ...

providing regular progress updates.? Oversee data configuration and take-on activities, including strong data analytics skills tocompare, reconcile, and validate outputs from the legacy system to the new platform.? Lead and manage a small test team, coordinating testing efforts across multiple locations.? Ensure all project communications are accurate ...

secure, and compliant data management practices, in line with G.D.P.R. and relevant data regulations. Support the migration and modernisation of legacy data systems into Azure and Microsoft Fabric environments. Monitor, troubleshoot, and improve data workflows, implementing automation and error-handling as needed. Produce and maintain technical documentation … client-facing environment. Excellent communication skills, able to translate technical solutions into business value. QUALIFICATIONS Bachelor’s degree in Computer Science, Data Engineering, Information Systems, or a related field preferred. At least 3 years of experience as a Data Engineer, ideally in consulting, professional services, or large enterprise environments. ...

trusted architectural decision-maker within large organisations 8+ years' experience of UK Customs , covering both business and technology domains Strong understanding of enterprise-scale systems, integration, and solution design Excellent stakeholder management and communication skills Ability to operate confidently in regulated, high-profile environments Nice-to-Have Experience working … large government or public-sector programmes Exposure to legacy modernisation and complex system integration Familiarity with agile and hybrid delivery models Experience influencing architecture across multiple suppliers or vendors ...

Security Architect Requirement Rate; Flexible Location; Remote - adhoc travel to London Duration; 6 month initial You will be supporting a Legacy Application program in upgrading hundreds of business applications across Wintel, Linux and cloud environments. Core Competencies Legacy System Modernisation: Proven experience in upgrading legacy … CHECK-accredited experience conducting or supporting pre- and post-deployment security assessments, vulnerability management, and remediation planning. Technical Experience Wintel/Linux: Securing legacy applications via patching, hardening, and privilege management (e.g., Active Directory, SELinux). Cloud (AWS/Azure/GCP): Designing IAM policies, encryption (FIPS ...

platforms: Splunk, ELK/Opensearch, CloudWatch Logs Metrics & telemetry: Prometheus, Grafana, OpenTelemetry Event management: ServiceNow, PagerDuty, Moogsoft, BigPanda Strong knowledge of instrumentation for distributed systems, microservices, containers (EKS, ECS), serverless workloads, and legacy systems. Migration & Architecture Skills Proven experience supporting large-scale on-prem to AWS migrations ...

public-sector environments. The role is hybrid working in London and is Inside IR35. Key Responsibilities Oversee end-to-end programmes focused on legacy application modernisation and upgrades. Lead on-premise to cloud transformation programmes (AWS and/or Azure). Drive the successful delivery of software … timeline commitments. Essential Experience Previous central government experience is mandatory. Proven experience managing large-scale technology or transformation programmes. Strong background in legacy system modernisation and cloud migration (AWS/Azure). Deep understanding of software delivery practices, methodologies, and governance. Experience managing multi-disciplinary teams and complex ...

interim and temporary professionals, fostering workplaces where everyone can contribute and succeed. On Behalf of Arup, we are looking for a Programme Director, Finance Systems Transformation Programme for a 12 Month Day Rate Contract based in London. Purpose of the role: The Finance Systems Transformation Programme … advisor to executives, translating complex delivery detail into clear, outcome-focused insights. Lead key decision-making forums and ensure decisions drive long-term value. Systems Integrator & Vendor Management Coordinate SI and third-party partners, ensuring delivery quality and adherence to contractual obligations. Monitor dependencies (including with the People Fusion ...

interim and temporary professionals, fostering workplaces where everyone can contribute and succeed. On Behalf of Arup, we are looking for a Programme Director, Finance Systems Transformation Programme for a 12 Month Day Rate Contract based in London. Purpose of the role: The Finance Systems Transformation Programme … advisor to executives, translating complex delivery detail into clear, outcome-focused insights. Lead key decision-making forums and ensure decisions drive long-term value. Systems Integrator & Vendor Management Coordinate SI and third-party partners, ensuring delivery quality and adherence to contractual obligations. Monitor dependencies (including with the People Fusion ...

large-scale mainframe modernisation programme within a complex enterprise environment. This is a contract role, ideal for specialists in secure API integration and legacy-to-digital transformation. The Role Youll design, build and support high-performance integration solutions using IBM DataPower Gateway, exposing core mainframe services as modern … Connect, MQ, CTG) Deep knowledge of API security, XSLT and GatewayScript Experience with API management platforms and DevOps automation Background in mainframe or legacy system modernisation projects Contract Details Contract role Hybrid working Competitive day rate Initial 6-month engagement Apply now if youre a DataPower specialist looking ...

Security Architect Requirement Rate; Flexible Location; Remote - adhoc travel to London Duration; 6 month initial You will be supporting a Legacy Application program in upgrading hundreds of business applications across Wintel, Linux and cloud environments. Core Competencies Legacy System Modernisation: Proven experience in upgrading legacy ...