1 to 25 of 713 Legacy Systems Jobs in the UK

over 20 years quietly powering some of the UK’s most complex networks -and now we’re growing fast. We’re looking for a Systems Data Architect to take ownership of how data and systems should work together across the business. You’ll reverse-engineer existing and legacy systems, establish the true current state, and design practical future-state data architecture, data flows and integrations that Development can implement. What it’s really like here The pace and intensity are higher than most environments in our sector. The workload is typically around 30% greater than ...

Legacy Systems Discovery & Migration Readiness Contract/Freelance (Initial 5–15 day engagement) Hybrid/On-site required initially (North West England) MadeByAI is seeking an experienced technical contractor to support the discovery, interrogation and documentation of a complex legacy business systems environment … part of a wider AI and systems transformation programme. This is not a typical software development role. The environment We are specifically looking for someone who is comfortable working with mature, business-critical systems that have evolved over decades. The environment includes: Microsoft Access applications VBA/Visual ...

join a well-established, cash rich business in this Director position. This is a pivotal moment in the evolution from legacy systems to a modern business, driving increased revenues and profits . This is a rare opportunity to lead a 2 year transformation of legacy ICT systems and ways of working, shaping the business into a modern, agile technology driven organisation that underpins growth, then afterwards undertake the ongoing IT Director role. You will work with the CEO and be at the centre of strategic decision-making, driving change and leading ...

join a well-established, cash rich business in this Director position. This is a pivotal moment in the evolution from legacy systems to a modern business, driving increased revenues and profits . This is a rare opportunity to lead a 2 year transformation of legacy ICT systems and ways of working, shaping the business into a modern, agile technology driven organisation that underpins growth, then afterwards undertake the ongoing IT Director role. You will work with the CEO and be at the centre of strategic decision-making, driving change and leading ...

MadeByAI is seeking an experienced technical contractor to support the discovery and documentation of a complex legacy systems environment in the North West of England. This position requires strong analytical skills and experience with legacy systems, specifically those reliant on Microsoft Access and SQL. … role focuses on understanding existing systems, identifying risks, and preparing for future migration. The contractor should thrive in challenging environments, especially with business-critical systems. #J-18808-Ljbffr ...

layer serving tens of millions of customer accounts across five markets — the backbone that lets every customer sign in, stay secure, and trust the systems behind every interaction with Tesco, in-store and online.We're looking for a Product Manager to own strategy and roadmap for a core part … that platform's data foundations: the systems that master, structure, and serve the datasets underpinning identity at scale. This is a genuinely technical product role — you'll work daily with engineering on legacy-to-modern migrations, large-scale data system design, and the quality and reliability that ...

advanced containerisation initiatives and improving the developer experience across the organisation. We’re particularly interested in engineers with deep experience modernising legacy systems, integrating CI/CD pipelines and mentoring senior technical teams. The Opportunity As Principal Engineer, you’ll lead pivotal engineering initiatives focused on making … complex Java estate fully containerisable. You’ll use your technical expertise to replatform, refactor and rebuild legacy systems, ensuring they integrate effectively with modern developer tooling and CI/CD pipelines. Alongside hands-on technical delivery, you’ll provide leadership and mentorship to senior engineers while promoting ...

Description:At Leonardo in Yeovil we are seeking experienced Software Engineers - Mission Management Systems to drive the end-to-end development of high-integrity aircraft software during a critical technical pivot.This role focuses on the evolution of our Tactical Mission Management Systems—maintaining the reliability of our legacy … uncrewed and autonomous capabilities.Your impactWorking within our Helicopter division, you will be taking ownership of complex mission system software component, ensuring legacy systems remain robust, while simultaneously leveraging open architectures to ensure our future uncrewed systems are modular, portable, and ready for the next generation ...

Were looking for an experienced Systems Analyst to support a major Data Migration and SaaS implementation project within the financial services environment. The role will support the replacement of a legacy collections platform with a new SaaS solution, with a strong focus on data migration, systems … functional requirements. Define project scope, objectives, backlog items and refinements. Support solution design and development across internal teams and external vendors. Lead Systems Integration Testing (SIT) and support User Acceptance Testing (UAT). Support implementation, operational readiness and transition into live service. Work with external suppliers to ensure delivery ...

standard range are managed through governance controls to protect internal equity. At Leonardo in Yeovil we are seeking an experienced Software Engineer - Mission Management Systems to drive the end-to-end development of high-integrity aircraft software during a critical technical pivot. This role focuses on the evolution … autonomous capabilities. Your impact Working within our Helicopter division, you will be taking ownership of complex mission system software component, ensuring legacy systems remain robust, while simultaneously leveraging open architectures to ensure our future uncrewed systems are modular, portable, and ready for the next generation ...

Convergence Group in Solihull is seeking a Systems Data Architect to own data and systems integration. You will reverse-engineer legacy systems, map current data flows and design practical future-state architectures that Development can implement. You will deliver clear data structures, interfaces and models ...

being a key 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 … 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.Due to high ...

total software engineering experience with a track record of successfully managing, scaling, and transforming engineering teams within a fast-paced SaaS environment.* Mobile & Systems Architecture Depth: Hands-on expertise in modern mobile application development (iOS, Android, React Native, or Flutter) alongside proven experience navigating hybrid environments combining legacy systems and cloud microservices.* AI Conviction: Genuine conviction about AI in engineering—you've moved teams beyond AI as a curiosity to AI as a core capability multiplier in developer workflows and product features.* Pragmatic Debt Navigator: A track record of navigating legacy systems ...

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 ...

build new solutions in support of strategic business initiatives, andinitiatives and mature our existing software and efficiently migrate and re-platform legacy systems to the cloud, using cloud native design patterns. Working closely with the enterprise architecture stream and platform engineering team to ensure alignment to organisational … assist the wider scrum team in taking accountability for theirs Work with platform engineering to automate build and deploy of existing and new systems Support the strategic goals of Capital Markets development; greenfield initiatives, replatforming and consolidating legacy systems, and adopting an automation-first approach ...

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.Manage multiple tasks … develop expertise.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, and data loading ...

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 ...

years of total software engineering experience with a track record of successfully managing, scaling, and transforming engineering teams within a fast-paced SaaS environment.Mobile & Systems Architecture Depth: Hands-on expertise in modern mobile application development (iOS, Android, React Native, or Flutter) alongside proven experience navigating hybrid environments combining legacy systems and cloud microservices.AI Conviction: Genuine conviction about AI in engineering—you've moved teams beyond AI as a curiosity to AI as a core capability multiplier in developer workflows and product features.Pragmatic Debt Navigator: A track record of navigating legacy systems and technical ...

stack Identified gaps, risks, and constraints Target architecture aligned to business and product direction Migration and/or retirement proposals for legacy systems Ensure transition plans are: Realistic and incremental Aligned with delivery priorities Understood by engineering and product teams 5. Cross-Domain Alignment & Delivery Support Support … Experience, Knowledge, Skills, Abilities, Education) Required Experience 15+ years of experience in software engineering, with significant time in architectural roles Proven experience designing distributed systems across cloud and application layers Strong experience with at least one major cloud platform (Azure, AWS, or GCP), ideally across multiple Experience integrating hardware ...

stack • Identified gaps, risks, and constraints • Target architecture aligned to business and product direction • Migration and/or retirement proposals for legacy systems Ensure transition plans are:• Realistic and incremental • Aligned with delivery priorities • Understood by engineering and product teams 5. Cross-Domain Alignment & Delivery SupportSupport effective … looking for someone who has:Required Experience• 15+ years of experience in software engineering, with significant time in architectural roles • Proven experience designing distributed systems across cloud and application layers • Strong experience with at least one major cloud platform (Azure, AWS, or GCP), ideally across multiple • Experience integrating hardware ...

teams, driving large‐scale modernization programs, and fostering a culture of innovation. You will be at the forefront of transforming our legacy systems into a modern, data‐enabled, and microservices‐based architecture to support our growing business needs. Key Responsibilities Technology Leadership & Strategy Define and execute … Finance, Agency Lending, or Collateral Management/Optimization is strongly preferred. Proven experience leading a successful, large‐scale technology transformation from legacy systems to a microservices‐based architecture. Education Bachelor’s or Master’s degree in Computer Science, Engineering, or a related technical field. Desired Skills Technical ...

services sector. As a Staff Engineer, you'll lead the design and delivery of high impact technology projects, helping clients modernise legacy systems, migrate to AWS and introduce modern CI/CD and cloud deployment practices. You'll combine hands-on engineering with technical leadership, problem solving … projects and client engagements from design through to delivery Developing scalable Java applications using Spring Boot and microservices Modernising and migrating legacy systems to AWS Designing and working with REST APIs and distributed systems Introducing and improving CI/CD and DevOps practices Providing technical expertise ...

onboarding and lifecycle of data sources, from discovery and evaluation through to production readiness Lead migration of datasets and workflows from legacy systems to strategic data platforms Partner with engineering, and operations, and commercial product teams to deliver scalable, reliable data capabilities Drive data quality, coverage … production (source evaluation, data mapping, ingestion patterns, validation rules, change management, and operational handover).Experience leading migration of datasets from legacy systems to target data platforms (e.g. cloud/data lake/warehouse), including data mapping, transformation design, reconciliation, parallel run strategies, and cutover planning to ensure ...

annum for 35 hours per week. Location: Bruce Kenrick House, 2 Killick Street, London N1 9FL What you’ll do As our Finance Systems Accountant, you will be the subject-matter expert for our legacy finance systems, including SunSystems 6.4, Infor Query & Analysis 11.3, Professional Advantage … will take responsibility for keeping the SunSystems platform reliable, controlled and audit-ready throughout its remaining operational life. Working within our specialist Finance Systems Team and reporting to the Head of Finance Systems, you will partner closely with colleagues across Finance and IT. This role sits ...

largest electrical wholesalers as we reimagine our technology for the digital age. We’re modernising our legacy systems and building new platforms powered by AWS and AI — and we need creative minds to help us shape the future! We're looking for an experienced Business Analyst … play a pivotal role in one of the most significant transformation programmes in our organisation's history. As we modernise our core business systems through a large-scale ERP transformation, you'll work at the heart of the programme—partnering with business stakeholders, technology teams and delivery partners ...