1 to 25 of 191 Permanent Legacy Systems Jobs in the UK

Data Integration Architect (SQL, Reverse Engineering, MSSQL API) Our client is seeking Data Integration Architect to take ownership of how data and systems interact across a growing and evolving organisation. This is a highly influential role that combines investigative analysis with future-state design. You'll reverse-engineer existing … legacy systems, uncover how they truly operate, and translate that understanding into scalable, practical architectures that development teams can implement. If you enjoy solving complex system challenges, making sense of undocumented processes, and designing clear, effective solutions, this role offers the opportunity to make a significant impact. ...

Data Migration | ETL | Legacy Systems | Cloud Technology | Actionstep Complex Data. Critical Migrations. Real Ownership. Know your way around a legacy database? Confident untangling complicated data structures and getting business-critical migrations over the line? At Nexian , we're helping law firms move beyond outdated systems … Microsoft technologies. As Actionstep Global Partner of the Year 2026, we're helping legal practices transition from legacy practice and case management systems to modern cloud-based platforms. Demand for these projects is growing, and we're expanding our data migration capability to support more clients, deliver ...

differentiator. We are modernising the platforms that power how M&S Foods designs products, collaborates with suppliers and manages commercial decisions. These systems sit at the centre of the M&S Foods ecosystem and support thousands of internal users and suppliers across product development, supply chain and commercial operations. … establish shared technical patterns that enable teams to build safely and efficiently. Our focus is evolving a complex landscape of legacy systems and point-to-point integrations into modern API-led and event-driven distributed systems that are easier to scale, operate and extend. ...

Core Responsibilities :Lead the design, architecture, and implementation of scalable APIs, services, and accessibility-first user interfaces. Drive the modernization of legacy systems into modular, event-driven, API-first components. Deliver AI-native features and improvements across both front-end and back-end, using multiple programming languages … outcomes from design through to production. Desirable :Experience with cloud platforms such as Azure, AWS, or GCP. Experience with event-driven architectures, distributed systems, or microservices. Experience modernizing legacy systems into modular, scalable platforms. Experience working in cross-functional product teams. Experience mentoring engineers or contributing ...

execution of the technical vision and strategy across multiple squads. Lead the design, architecture, and development of scalable, reliable, and high-performance software systems, including system design, technology selection, and overall architecture. Champion data integrity and performance, ensuring systems are designed for scalability and operational resilience. … telemetry, alerts, and logs to ensure system reliability and performance. Expertise in data architecture and modelling, with a strong understanding of legacy systems and performance optimisation techniques relevant to operational data platforms. Proven experience designing and implementing event-driven architectures (EDA) to support real-time data flows. ...

processes and data transformation logic to improve and normalise financial data. Validate and reconcile data loaded into Workday, ensuring consistency with legacy systems and financial requirements. Engage regularly with clients throughout the project lifecycle, ensuring a smooth transition from legacy systems to Workday Financials. … Skills & Requirements: Bachelor's degree or equivalent experience in Information Technology, MIS, Finance, or a related field. Experience in ERP data conversion or financial systems implementation. Experience with Workday Financials is essentialUnderstanding of financial data structures, including General Ledger, transactions, and reporting frameworks. Experience with data conversion, migration ...

.NET, Azure, SQL Server, and modern web technologies. This role is ideal for someone who enjoys working across both modern and legacy systems, values clean code and software quality, and thrives in a collaborative Agile environment. Competitive salary, long-term career progression, and the opportunity to make … practices, and comfortable working across modern and legacy technology stacks. You will play a key role in developing scalable applications, improving existing systems, and contributing to continuous improvement initiatives across the wider technology function. Key Responsibilities Software Development & Delivery Design, develop, test, and maintain high-quality software ...

Migration Analyst - London - £65k The Opportunity A well-established UK organisation is embarking on a major enterprise transformation programme, replacing several legacy systems with a modern Microsoft-based ERP platform. This multi-year initiative will transform finance, operational and property-related processes across the business. As part … play a key role in ensuring data quality and successful system adoption. Key Responsibilities Analyse, extract and assess data from legacy systems and business-owned spreadsheets. Cleanse, standardise and enrich data to ensure readiness for migration. Support the creation of source-to-target mappings and transformation rules. ...

This is an opportunity for an experienced pensions data migration professional to provide technical direction across the migration of data from legacy systems into a new environment. Working alongside data specialists, business stakeholders and third-party providers, you will help ensure the migration is controlled, accurately documented … activities Required Experience Proven experience delivering data migrations within pensions Understanding of pension scheme, employer and member data Experience with legacy systems, data mapping and transformation requirements Strong knowledge of migration controls, version control and data traceability Experience supporting data quality, validation and reconciliation Ability to provide ...

long-term maintainability Guide API and domain design standards - clear service boundaries, consistent contracts, and pragmatic integration between modern services and legacy systems Shape event-driven and integration patterns so teams can build independently without breaking cross-squad journeys Champion automated testing, observability, and production readiness … Oversee database and schema evolution practices - migrations, data integrity, and performance - in partnership with platform and infrastructure teams Lead incident response for backend-owned systems - triage, escalation, post-incident reviews, and runbook quality Mentor engineers on PHP (Yii/Yii2), Go, Security, Performance and Optimisation - raising the bar through ...

sales, not a service function. Teams ship high-quality software frequently and predictably. Platforms are scalable, secure and future-ready, with legacy systems retired and technical debt under control. Engineers use AI and modern tooling to work faster and better. Engineering is a place where strong people … Champion agile ways of working and keep improving how teams plan, build, test and ship. Platform, ad serving and scaleOwn the engineering of the systems that carry the marketplace: hosting and distribution, real-time and dynamic ad insertion, the auction and yield layer, the data platform behind targeting ...

teammate that's welcoming, respectful and inclusive, with great opportunity for professional growth. Find your future with us. The team: The Software Engineering and Systems Integration team in the UK is actively working across Boeing Defence, Commercial Airplanes, Global services and Uncrewed technologies. The Software Engineering team works … development of Synthetic Environment Sub-systems, Mission Systems Capability, Autonomous Behaviours, enhancement of Ground Control Systems, Technical Publications and various in-house proprietary tools for the Defence platforms. The team is also contributing to Commercial Modification of aircrafts, development of Onboard Network Systems, Cabin Interiors ...

Business Systems Analyst Location: Cullompton About Us: Welcome to Gregory Distribution Ltd, where technology and logistics come together to drive operational excellence. As part of our commitment to continuous improvement, we are undertaking a group-wide IT equipment upgrade. Join our dynamic Technology Team and be part … project that will modernise and enhance our IT infrastructure across the UK. Job Description: Join our dynamic Technology team as an IT Business Systems Analyst , where you'll play a pivotal role in shaping and supporting the systems that drive our visionary logistics solutions. This is more than ...

/CD workflows, focusing on consolidation, automation, and scalability. Drive the design and development of system architecture, work with end-users of the systems, and enhance the quality of deliverables Ensure staff follows Citi documented policy and procedures as well as maintain desktop procedures and supporting documentation for filings … degree or above (or equivalent education) in a STEM discipline. Proven experience in software engineering and development, and a strong understanding of computer systems and how they operate. Hands on Experience in Java , Spring, Understanding of ultra-low-latency development practices. Proven understanding of FX highly preferredWell versed with ...

/CD workflows, focusing on consolidation, automation, and scalability. Drive the design and development of system architecture, work with end-users of the systems, and enhance the quality of deliverables Ensure staff follows Citi documented policy and procedures as well as maintain desktop procedures and supporting documentation for filings … degree or above (or equivalent education) in a STEM discipline. Proven experience in software engineering and development, and a strong understanding of computer systems and how they operate. Hands on Experience in Java , Spring, Understanding of ultra-low-latency development practices. Proven understanding of FX highly preferredWell versed with ...

/CD workflows, focusing on consolidation, automation, and scalability. Drive the design and development of system architecture, work with end-users of the systems, and enhance the quality of deliverables Ensure staff follows Citi documented policy and procedures as well as maintain desktop procedures and supporting documentation for filings … degree or above (or equivalent education) in a STEM discipline. Proven experience in software engineering and development, and a strong understanding of computer systems and how they operate. Hands on Experience in Java , Spring, Understanding of ultra-low-latency development practices. Proven understanding of FX highly preferredWell versed with ...

Control Systems Engineer x2 £45-60k + Paid Overtime, Pension, Training, 23 Days Holiday + Bank Holidays Hinckley/Coventry - Hybrid/Flexible Working Available Ref: 25681 A fantastic opportunity has arisen for two experienced Controls Engineers to join a well-established and growing control systems engineering … across sectors including Automotive, Food & Beverage, Aerospace and Pharmaceutical, taking projects from software design and development through to testing, commissioning and customer handover. Control Systems Engineer – The Role: Design and develop PLC software from first principles for bespoke industrial automation systems Program primarily Siemens TIA Portal/ ...

Control Systems Engineer x2 £45-60k + Paid Overtime, Pension, Training, 23 Days Holiday + Bank Holidays Staffordshire - Hybrid/Flexible Working Available Ref: 25719 A fantastic opportunity has arisen for two experienced Controls Engineers to join a well-established and growing control systems engineering business. Following … Staffordshire, the role is commutable from Stafford, Cannock, Rugeley, Lichfield, Tamworth and surrounding areas, with customer-site travel required during commissioning phases. Control Systems Engineer – The Role: Design and develop PLC software from first principles for bespoke industrial automation systems Program primarily Siemens TIA Portal/ ...

migration strategies for complex enterprise SAP S/4HANA transformation projects. Youll bridge the gap between functional business requirements and technical implementation, ensuring legacy data is cleansed, mapped, transformed, and seamlessly migrated into the S/4HANA environment with zero compromise on data integrity, governance, or business continuity. … deep understanding of S/4HANA unified data models (Universal Journal/ACDOCA, BP Model). Experience migrating data from diverse legacy systems (SAP ECC, Oracle, Salesforce, legacy mainframe/ERP systems). Bachelors degree in Computer Science, Information Technology, Business Information Systems ...

strategies for complex enterprise SAP S/4HANA transformation projects. You'll bridge the gap between functional business requirements and technical implementation, ensuring legacy data is cleansed, mapped, transformed, and seamlessly migrated into the S/4HANA environment with zero compromise on data integrity, governance, or business continuity. … deep understanding of S/4HANA unified data models (Universal Journal/ACDOCA, BP Model). Experience migrating data from diverse legacy systems (SAP ECC, Oracle, Salesforce, legacy mainframe/ERP systems). Bachelor's degree in Computer Science, Information Technology, Business Information Systems ...

strategies for complex enterprise SAP S/4HANA transformation projects. You'll bridge the gap between functional business requirements and technical implementation, ensuring legacy data is cleansed, mapped, transformed, and seamlessly migrated into the S/4HANA environment with zero compromise on data integrity, governance, or business continuity. … deep understanding of S/4HANA unified data models (Universal Journal/ACDOCA, BP Model). Experience migrating data from diverse legacy systems (SAP ECC, Oracle, Salesforce, legacy mainframe/ERP systems). Bachelor's degree in Computer Science, Information Technology, Business Information Systems ...

delivery, providing practical technical leadership to development teams while defining a scalable, long-term architectural approach. Define the software architecture for complex automation and systems integration projects. Design scalable, secure and maintainable applications using C#/.NET, Python and Django . Establish clear architectural standards, design principles and technology … roadmaps. Translate customer, operational and engineering requirements into practical technical solutions. Design platforms that integrate business applications, databases, automation systems, third-party products and physical equipment. Define service boundaries, APIs, data flows, interface specifications and integration patterns. Produce architecture diagrams, technical designs, data models and supporting documentation. Design distributed ...

greatest impact, efficient use of resource, and alignment to business structuresDrive the design and development of system architecture, work with end-users of the systems, and enhance the quality of deliverables Ensure staff follows Citi documented policy and procedures as well as maintain desktop procedures and supporting documentation … that is seen as the engineering role model for the organizationAbility to work directly with trading and quant teamsProven track record of building new systems, replacing legacy systems and renovating existing systemsThe candidate will have a strong systems (software, hardware, networks) knowledge required to define ...

companies operate? Some of the world's largest organisations are held back by the very software designed to support them. Complex legacy systems, fragmented infrastructure and slow moving processes make innovation harder than it should be. This company is changing that. They're building an AI native … operating system for the enterprise, designed to remove IT complexity, modernise critical systems and fundamentally change how large organisations operate. With a recently secured $60M Series A, backing from leading investors and major global enterprises already trusting their technology, they're making a serious impact ...

category-defining platform for debt markets worldwide. We're looking for a Senior II Product Engineer to take broad technical ownership of the backend systems powering 9fin's platform. You will sit between our Senior and Staff engineering tracks. You will own meaningful systems end to end, lead … financial and legal domain experts. This role suits someone who has already grown beyond a typical senior remit. You enjoy diving into distributed systems problems, and you have firsthand experience scaling services under real production load. What you'll doOwn the design and delivery of significant backend systems ...