1 to 25 of 259 Permanent Legacy Systems Jobs in the UK

engineering performance across delivery, quality and technical standards, while helping shape the next phase of platform evolution. This includes modernising legacy systems, driving adoption of modern technologies and embedding AI-led efficiencies into both internal engineering workflows and customer-facing products. The Role Reporting directly … high-performing engineering function across multiple disciplines Own engineering delivery, release quality and technical execution Drive platform modernisation and migration from legacy systems to modern architectures Build scalable, modular, service-oriented systems and technical standards Oversee DevOps, infrastructure reliability, monitoring and release processes Foster strong collaboration ...

scale financial data platform. You'll be working with the technology team, supporting a core platform modernisation initiative. Our environment combines long-established enterprise systems and legacy components with modern cloud-based services running on AWS. The platform processes high-volume structured financial data and underpins both … internal systems and customer-facing products. A substantial portion of the platform is built on large SQL Server data estates, making strong SQL expertise non-negotiable. You will play a key role in modernising core systems, improving performance and reliability, and delivering scalable services for the next generation ...

Business Systems and Application Engineer Permanent Milton Keynes Hybrid working Were supporting a leading SME engineering organisation that specialises in complex, high value electromechanical systems for naval and defence platforms. Theyre looking to appoint a driven Business Systems and Application Engineer to help drive digital transformation … operational efficiency across the business. Key Responsibilities Own and manage core business systems and integrations Build Power Apps for data capture and operational workflows Automate processes using Power Automate Develop Power BI dashboards, reports and KPI displays Integrate data across multiple systems (SQL, SharePoint, Dataverse, APIs, legacy ...

requests, and system improvement work ABOUT THE CLIENT We're working with an established and growing technology-driven organisation that specialises in data-led systems and analytics solutions. Due to continued demand and internal growth, they're looking to bring in an experienced Application Support Engineer to support … 12pm -8pm shifts due to US based clients. THE BENEFITS * Hybrid working model with flexibility * Opportunity to work on complex, data-driven systems * Exposure to both modern and legacy environments * Strong focus on autonomy and problem-solving * Collaborative environment with opportunities to influence system improvements ...

suited to someone who enjoys owning delivery, leading projects, and working closely with stakeholders. While there is some responsibility for supporting legacy systems, the focus of the role is firmly on the future - building, shaping, and delivering data pipelines into GCP and BigQuery. You'll be part … working on: Designing, building, and maintaining data pipelines feeding GCP and BigQuery Supporting the transition from legacy SQL-based systems into cloud-native architectures Day-to-day Python development within a modern cloud environment Delivering and leading data engineering projects end-to-end - from scoping through ...

live trading. This is not a greenfield role. Success comes from adding value immediately within a large, demanding codebase — understanding existing Java and .NET systems well enough to reason about trade-offs, guide refactoring or selective rewrites, and make sound architectural decisions under pressure. The roadmap you produce … themselves. A strong candidate will actively embrace agentic AI tooling as a force multiplier — not just to accelerate development, but to rapidly comprehend unfamiliar systems, trace behaviour across services, uncover hidden dependencies, and validate architectural thinking. Combined with deep equities domain knowledge and experience building large-scale distributed systems ...

.We ENABLE hybrid cloud transformation – You will implement modern hybrid data architectures (e.g. Snowflake, Redshift, BigQuery) and drive the migration of legacy systems to cloud-native solutions that unlock agility and performance.We INNOVATE with AI-driven data solutions – You will create Proof of Concepts and Minimum Viable … understanding of ETL/ELT processes and modern architecture patterns such as Data Mesh and Data Fabric.* Migration & Transformation: Experience migrating legacy systems to cloud-native data stores.* Consulting & Commercial Acumen – Strong background in advisory roles, project scoping, budgeting and managing complex stakeholder relationships.* SC Cleared/ ...

leadership within the technology team and a number of upcoming projects, this is a great time to join a business investing in its systems and digital capabilities. Full Stack Developer Hampshire | Hybrid Working | £45,000 – £50,000 You’ll be working as part of a collaborative development team , helping … C# and .NET Designing and building RESTful APIs that support internal and external services Contributing to new greenfield projects , as well as improving existing systems Supporting the modernisation of legacy applications Working with cloud-based infrastructure in Microsoft Azure Collaborating with developers, product stakeholders, and support teams ...

leadership within the technology team and a number of upcoming projects, this is a great time to join a business investing in its systems and digital capabilities. Full Stack Developer Hampshire | Hybrid Working | £45,000 - £55,000 You'll be working as part of a collaborative development team , helping … C# and .NET Designing and building RESTful APIs that support internal and external services Contributing to new greenfield projects , as well as improving existing systems Supporting the modernisation of legacy applications Working with cloud-based infrastructure in Microsoft Azure Collaborating with developers, product stakeholders, and support teams ...

Title: Systems Developer ( .NET – Billing Systems) Location: Remote (UK) – Office based in North Yorkshire Salary: Up to £40,000 About the Role A well-established UK-based telecommunications services business is seeking a Systems Developer to join its development team. This role is focused on the support … enhancement, and modernisation of enterprise-level billing systems that process large volumes of critical data. The successful candidate will help ensure existing billing processes run accurately and efficiently, while also contributing to the development of modern, automated systems designed to reduce manual intervention and improve reliability. This position ...

lead the backend transformation of one of the UK’s fastest-growing and most innovative storage platforms? Eager to dismantle legacy systems and build scalable, modern architecture that powers millions of customer interactions across the country? Looking to own critical national systems at a business that … Technology & Product. You will: Own the end-to-end overhaul and modernisation of our backend platform. Lead the gradual migration from legacy systems to a flexible, scalable, cloud-native architecture. Support integration with industry-standard solutions. Collaborate closely with Product, Operations, and stakeholders to define requirements ...

. We’re looking for exceptional Tech Leads to take ownership of a core API Platform Team , driving the transition from legacy systems into a modern, scalable, API-first architecture — with a key shift from PHP into Golang . ✅ The Essentials 💻 Fully Remote (UK-based) ✈️ Monthly …/CD: GitHub Actions 🎯 What You’ll Be Doing 🔹 Leading the technical direction of the API platform 🔹 Driving migration from legacy systems to API-first architecture 🔹 Building high-performance, scalable services in Golang 🔹 Defining API standards (design, versioning, security) 🔹 Writing clean, production-grade code 🔹 Line managing & mentoring ...

. We’re looking for exceptional Tech Leads to take ownership of a core API Platform Team , driving the transition from legacy systems into a modern, scalable, API-first architecture — with a key shift from PHP into Golang . ✅ The Essentials 💻 Fully Remote (UK-based) ✈️ Monthly …/CD: GitHub Actions 🎯 What You’ll Be Doing 🔹 Leading the technical direction of the API platform 🔹 Driving migration from legacy systems to API-first architecture 🔹 Building high-performance, scalable services in Golang 🔹 Defining API standards (design, versioning, security) 🔹 Writing clean, production-grade code 🔹 Line managing & mentoring ...

. We’re looking for exceptional Tech Leads to take ownership of a core API Platform Team , driving the transition from legacy systems into a modern, scalable, API-first architecture — with a key shift from PHP into Golang . ✅ The Essentials 💻 Fully Remote (UK-based) ✈️ Monthly …/CD: GitHub Actions 🎯 What You’ll Be Doing 🔹 Leading the technical direction of the API platform 🔹 Driving migration from legacy systems to API-first architecture 🔹 Building high-performance, scalable services in Golang 🔹 Defining API standards (design, versioning, security) 🔹 Writing clean, production-grade code 🔹 Line managing & mentoring ...

. We’re looking for exceptional Tech Leads to take ownership of a core API Platform Team , driving the transition from legacy systems into a modern, scalable, API-first architecture — with a key shift from PHP into Golang . ✅ The Essentials 💻 Fully Remote (UK-based) ✈️ Monthly …/CD: GitHub Actions 🎯 What You’ll Be Doing 🔹 Leading the technical direction of the API platform 🔹 Driving migration from legacy systems to API-first architecture 🔹 Building high-performance, scalable services in Golang 🔹 Defining API standards (design, versioning, security) 🔹 Writing clean, production-grade code 🔹 Line managing & mentoring ...

. We’re looking for exceptional Tech Leads to take ownership of a core API Platform Team , driving the transition from legacy systems into a modern, scalable, API-first architecture — with a key shift from PHP into Golang . ✅ The Essentials 💻 Fully Remote (UK-based) ✈️ Monthly …/CD: GitHub Actions 🎯 What You’ll Be Doing 🔹 Leading the technical direction of the API platform 🔹 Driving migration from legacy systems to API-first architecture 🔹 Building high-performance, scalable services in Golang 🔹 Defining API standards (design, versioning, security) 🔹 Writing clean, production-grade code 🔹 Line managing & mentoring ...

emerging frameworks (including MCP where relevant) Influence product and engineering teams to adopt AI-first thinking Help modernise and evolve legacy systems into scalable, future-ready architectures Drive standardisation of data, language and structures across the business Deliver solutions that are production-ready and commercially impactful … delivery Commercially driven — focused on revenue, growth, and real-world impact Resilient and adaptable — comfortable working with both modern and legacy systems Motivated by solving complex problems and seeing your work deployed at scale You also bring : A strong appreciation for structured thinking, language, and data consistency ...

active role in shaping the next generation of our platform. This is an ideal opportunity for an engineer who enjoys working with complex systems, values clean and maintainable code, and is motivated by meaningful technical challenges. Key Responsibilities Design, build, test, and deliver new features within a desktop-based … grounding in software engineering principles and best practices Experience working within large or complex codebases Demonstrated ability to refactor and improve legacy systems Excellent debugging and problem-solving capabilities Experience with real-time or multi-threaded applications Proficiency in C/C++ and C# Personal Attributes Clear ...

clearly communicated, understood, and consistently applied Design and Innovation Define and maintain architectural patterns across backend services, APIs, data platforms, and front end systems Design scalable, resilient systems for analytics, workflow orchestration, and intelligence features Guide decomposition of legacy systems into well defined services … domains Evaluate technologies and data stores, favoring open standards and long term maintainability Architect distributed systems with focus on reliability, fault tolerance, and scalability Standards & Governance Establish API design standards ensuring consistency, discoverability, and ease of integration Define front end standards prioritizing web platform capabilities, progressive enhancement, and accessibility ...

IR35 £700–£750 per day The Role You will support the evolution of a large-scale financial data platform, modernising legacy enterprise systems while building scalable cloud-based services on AWS. Own SQL Server optimisation, backend service design, and API development in a high-impact platform modernisation … performance tuning, indexing, complex queries) – non-negotiable Backend development in Python or C# AWS environment experience Proven experience in enterprise or legacy systems – critical Strong analytical and problem-solving abilities We'd expect you to have around 10 years of software and data engineering skills. Nice ...

leading the resolution of structural platform issues. Leveraging strong integration expertise, you will design and manage complex data mappings across legacy systems, middleware, and modern platforms, while maintaining clear, high‐quality architecture documentation to support long‐term operational ownership. Responsibilities Architecture Blueprint Delivery Produce high‐quality High … Level Designs (HLDs) and Low‐Level Designs (LLDs) across core platforms including Digital Transaction Systems (DTS), EPOS, and other strategic programmes. Designs must be detailed, unambiguous, and set the contractual delivery standard for external vendors. Vendor Governance & Quality Assurance Perform structured reviews and audits of vendor‐delivered architecture ...

Hello, Thank you for your interested in our L2-L3 Systems Engineer position here at Teleperformance UK. Were looking for a self-driven and proactive Systems Engineer (Level 23) with a genuine passion for technology and problem-solving. This role is ideal for someone who thrives in dynamic … expected to join an on-call rota. Contract Term: Permanent The Role Participate in the maintenance, monitoring, implementation and decommission of IT systems, including servers, storage and hardware; and provide professional support and knowledge of Teleperformance systems to internal business units and clients. They will submit recommendations ...

Apply below after reading through all the details and supporting information regarding this job opportunity. Thank you for your interested in our L2-L3 Systems Engineer position here at Teleperformance UK. Were looking for a self-driven and proactive Systems Engineer (Level 23) with a genuine passion … expected to join an on-call rota. Contract Term: Permanent The Role Participate in the maintenance, monitoring, implementation and decommission of IT systems, including servers, storage and hardware; and provide professional support and knowledge of Teleperformance systems to internal business units and clients. They will submit recommendations ...

Apply below after reading through all the details and supporting information regarding this job opportunity. Thank you for your interested in our L2-L3 Systems Engineer position here at Teleperformance UK. Were looking for a self-driven and proactive Systems Engineer (Level 23) with a genuine passion … expected to join an on-call rota. Contract Term: Permanent The Role Participate in the maintenance, monitoring, implementation and decommission of IT systems, including servers, storage and hardware; and provide professional support and knowledge of Teleperformance systems to internal business units and clients. They will submit recommendations ...

Fixed Term/Secondment This role supports the delivery and smooth running of the Patient Administration System (PAS) and other core clinical and business systems as part of the BSW Group's shared Electronic Patient Record (EPR) programme. Working within one of the three Trusts ,Great Western Hospital … Royal United Hospitals Bath (RUH) or Salisbury Foundation Trust (SFT) The postholder will help maintain and administer Cerner Millennium PAS alongside key systems such as pathology, radiology, pharmacy and legacy applications. The position plays an important part in ensuring that digital systems operate reliably, data quality ...