76 to 100 of 269 Legacy Systems Jobs in the UK

This is a business where software directly supports real-world decision-making, and where developers work closely with users who genuinely depend on the systems they build. The role is fully remote (UK-based) and offers a salary of up to £70,000, depending on experience. Role … understand issues, requirements and opportunities for improvement Delivering fixes, small enhancements and new tools or services based on real user needs Supporting live production systems, including investigation and resolution of application issues Contributing to improvements in architecture, tooling and development practices over time Core Technology Stack Java (server-side ...

organisation is evolving from a legacy PHP platform to a modern, cloud-native, AI-enabled architecture, offering the chance to shape greenfield systems and influence engineering direction. Senior Full-Stack Software Engineer Responsibilities Design and build scalable full-stack applications using TypeScript, Node.js, and React Lead … migration from legacy PHP systems to a modern JavaScript/TypeScript stack Develop and maintain cloud infrastructure on AWS (EKS, S3, DynamoDB) using Terraform (IaC) Build and optimise CI/CD pipelines (GitHub Actions) to enable efficient delivery Contribute to AI-enabled software development, including AI-assisted ...

Title: Engineering Lead (C++) - Low Latency/Trading Systems Location: London (Hybrid) Overview Our client is a global fintech operating at scale across trading, risk, and market connectivity. They are hiring an Engineering Lead (C++) to take ownership of a business-critical platform sitting at the heart of real … Define and deliver a clear technical and product vision Improve release processes, reducing downtime and increasing deployment frequency Drive modernisation across legacy systems, infrastructure, and tooling Collaborate closely with trading, quant, and risk stakeholders Remain hands-on, contributing to production-grade C++ code What They're Looking ...

trillion on benefits every year. It’s their second-largest cost after payroll — yet the entire category is still running on legacy systems and outdated assumptions. The space is primed for transformation: despite its scale, it’s been almost completely overlooked by AI-first startups. Incumbents — including … deployment, and iteration of our next-generation benefits platform features that leverage personalization, experimentation, and AI/ML methods (e.g. agents/LLMs, recommender systems, reinforcement learning) to enhance user experience in a meaningful business domain. Contribute across the tech stack: You’ll work in React (JavaScript/TypeScript ...

delivery of a critical Command, Control, Communications, and Computers (C4) capability. This programme spans multiple security domains and aims to modernise legacy systems into agile, configurable operational information services aligned with Defence's vision of a Platform (DaaP). What you'll be doing: Manage all proposed ...

products. With a strong reputation for solving complex technical challenges, they work with leading organisations to deliver AI-enabled solutions, modernise legacy systems, and build high-performance applications. Their teams are distributed globally and operate in a highly collaborative, engineering-led environment. The Role As a Technical ...

containers, serverless, broader ecosystem) What They're Looking For Strong platform/solution architecture experience in modern cloud environments Background building scalable, distributed systems Ability to operate at a senior stakeholder level Strong communication and influencing skills A modern engineering mindset (not tied to legacy approaches … This Role Shape a next-generation platform, not maintain legacy systems High visibility with direct impact on business growth and platform direction Environment investing heavily in modern engineering and cloud If you think you have the necessary skills and experience then please apply now! McGregor Boyall ...

DWP. Digital with Purpose. Join DWP as a Senior Software Engineer in the PTP-MOSS team, maintaining and improving vital legacy systems that enable services for millions across the UK. Our DWP Digital teams use fresh ideas and leading-edge tech to build and maintain digital solutions … Java. You and your role As a Software Engineer at DWP Digital, you will play a vital role in maintaining and enhancing the systems that underpin some of the UK's most essential public services. You'll work on complex legacy applications that support DWP operations, ensuring ...

DWP. Digital with Purpose. Join DWP as a Senior Software Engineer in the PTP-MOSS team, maintaining and improving vital legacy systems that enable services for millions across the UK. Our DWP Digital teams use fresh ideas and leading-edge tech to build and maintain digital solutions … Java. You and your role As a Software Engineer at DWP Digital, you will play a vital role in maintaining and enhancing the systems that underpin some of the UK's most essential public services. You'll work on complex legacy applications that support DWP operations, ensuring ...

DWP. Digital with Purpose. Join DWP as a Senior Software Engineer in the PTP-MOSS team, maintaining and improving vital legacy systems that enable services for millions across the UK. Our DWP Digital teams use fresh ideas and leading-edge tech to build and maintain digital solutions … Java. You and your role As a Software Engineer at DWP Digital, you will play a vital role in maintaining and enhancing the systems that underpin some of the UK's most essential public services. You'll work on complex legacy applications that support DWP operations, ensuring ...

DWP. Digital with Purpose. Join DWP as a Senior Software Engineer in the PTP-MOSS team, maintaining and improving vital legacy systems that enable services for millions across the UK. Our DWP Digital teams use fresh ideas and leading-edge tech to build and maintain digital solutions … Java. You and your role As a Software Engineer at DWP Digital, you will play a vital role in maintaining and enhancing the systems that underpin some of the UK's most essential public services. You'll work on complex legacy applications that support DWP operations, ensuring ...

lifecycle, leveraging modern engineering practices to deliver secure, reliable, and high-performing platforms. What You’ll Do Improve reliability, scalability, and performance of critical systems Build and optimise CI/CD pipelines and automation Reduce tech debt and modernise legacy architectures Enhance monitoring, observability, and incident response … Enable weekly release cadence through better engineering practices Support integration of API and AI capabilities into existing systems What You’ll Bring Experience in SRE/DevOps/Platform Engineering Strong AWS and Infrastructure as Code (Terraform, etc.) Solid CI/CD and automation experience (e.g. GitLab) Programming skills ...

Data Migration Lead to support a major transformation programme. This role will focus on the migration of complex datasets from legacy housing systems, including Capita Open Housing , into a new target platform. The Role As the Data Migration Lead, you will take ownership … support delivery Key Skills and Experience Proven experience as a Data Migration Lead on complex transformation programmes Experience with legacy housing systems, ideally Capita Open Housing Strong knowledge of ETL processes and frameworks Proficiency in SQL, scripting, and data extraction techniques Experience working with multiple data sources ...

code? Looking for a role where you can lead a team, shape technical direction, and stay hands-on in building scalable, high-impact systems? We’re partnering with a high-growth, product-led tech business operating in a complex, data-driven environment. They’re expanding their engineering teams … hands-on leadership role (circa 60–70% coding) Owning the technical direction of API-first platforms Driving the evolution from legacy systems to modern, scalable architecture Ensuring high standards across code quality, testing, and delivery Acting as the technical authority and escalation point within your team Collaborating ...

code? Looking for a role where you can lead a team, shape technical direction, and stay hands-on in building scalable, high-impact systems? We’re partnering with a high-growth, product-led tech business operating in a complex, data-driven environment. They’re expanding their engineering teams … hands-on leadership role (circa 60–70% coding) Owning the technical direction of API-first platforms Driving the evolution from legacy systems to modern, scalable architecture Ensuring high standards across code quality, testing, and delivery Acting as the technical authority and escalation point within your team Collaborating ...

code? Looking for a role where you can lead a team, shape technical direction, and stay hands-on in building scalable, high-impact systems? We’re partnering with a high-growth, product-led tech business operating in a complex, data-driven environment. They’re expanding their engineering teams … hands-on leadership role (circa 60–70% coding) Owning the technical direction of API-first platforms Driving the evolution from legacy systems to modern, scalable architecture Ensuring high standards across code quality, testing, and delivery Acting as the technical authority and escalation point within your team Collaborating ...

code? Looking for a role where you can lead a team, shape technical direction, and stay hands-on in building scalable, high-impact systems? We’re partnering with a high-growth, product-led tech business operating in a complex, data-driven environment. They’re expanding their engineering teams … hands-on leadership role (circa 60–70% coding) Owning the technical direction of API-first platforms Driving the evolution from legacy systems to modern, scalable architecture Ensuring high standards across code quality, testing, and delivery Acting as the technical authority and escalation point within your team Collaborating ...

code? Looking for a role where you can lead a team, shape technical direction, and stay hands-on in building scalable, high-impact systems? We’re partnering with a high-growth, product-led tech business operating in a complex, data-driven environment. They’re expanding their engineering teams … hands-on leadership role (circa 60–70% coding) Owning the technical direction of API-first platforms Driving the evolution from legacy systems to modern, scalable architecture Ensuring high standards across code quality, testing, and delivery Acting as the technical authority and escalation point within your team Collaborating ...

effort or cost-of-delay approaches Confident working with cross-disciplinary teams and senior technical stakeholders Comfortable operating in environments with legacy systems, competing priorities and incomplete information Excellent communicator, can translate complex technical issues into clear decisions and trade-offs You ll Thrive Here … deliver value - "product thinking for platforms" Believe in outcomes over output and in learning through iteration Value sustainability over speed, preferring well-designed, reliable systems to quick fixes Enjoy bringing structure and clarity to technically challenging, interdependent environments Are collaborative, pragmatic and curious - a steady hand in a complex ...

latest AI tools and models, partner technical teams, and early capability previews that the wider market does not. We are deploying production AI systems into the world's most complex organisations across Financial Services, Energy, and Healthcare. We exist to make AI a genuine competitive advantage for our clients … engagements at some of the most complex organisations in the UK. Technically, commercially, and in the room with engineering leaders who have built serious systems and are not easily impressed. What You Will Do Lead engagements that transform how enterprise engineering organisations build software - from discovery and assessment through ...

technology direction. Key Responsibilities: • Own and evolve enterprise architecture across ERP technologies, including optimisation of S/4HANA and migration from legacy systems • Define target architectures and transition roadmaps aligned to strategic business priorities • Provide architectural leadership across major Finance and Logistics programmes • Act as a senior … translate business strategy into clear technology direction and outcomes • Experience influencing senior technical and non-technical stakeholders • Strong understanding of finance and or logistics systems and how they integrate across wider architecture • Experience working on large-scale transformation programmes, with S/4HANA desirable but not essential • Previous leadership ...

Applications Administrator – Education Systems Location: Birmingham area/Hybrid working Salary: Up to £55k plus benefits Reporting to: Head of Applications Overview We are supporting an established UK Care Provider investing in enterprise technology and digital‐first operating models to replace legacy systems, streamline delivery … support ambitious, private‐equity‐backed growth. We are recruiting for an Applications Administrator – Education Systems to support and manage core education and safeguarding platforms across schools and education settings. You will be responsible for improving the technology roadmap for critical enterprise applications within their Education workstream, as well ...

modern data platform from the ground up. Were working with a business in the middle of a high-impact data transformationmoving away from legacy constraints towards a scalable, cloud-first architecture. Theyre looking for a Principal Data Engineer to take a leading role in that journey. This isnt … skills in Python and SQL Hands-on experience with Databricks, Azure, and GCP/BigQuery Proven ability to work across both legacy systems and modern cloud environments Key Skills DevOps mindset you automate wherever possible and write clean, testable code Pragmatic approach focused on delivering value without ...

Risk Management frameworks Participate in Show and Tell sessions with stakeholders Troubleshoot, debug, and enhance existing applications Evaluate and improve legacy systems, including reprogramming and adding new features Produce technical documentation, user guides, and training materials Collaborate with IT teams to define specifications for new development Provide ...

patterns and prepare Interface Specifications Design Documents Guide parameterization and maintenance setup across various FLEXCUBE modules Support data migration activities from legacy systems, including data mapping and validation Testing & Quality Assurance: Develop comprehensive test scenarios and test cases covering both functional and integration aspects Lead System Integration ...