26 to 50 of 272 Legacy Systems Jobs in the UK

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 ...

play a pivotal role. This is a high-impact position where you'll lead the end-to-end migration from legacy billing systems to a modern, scalable platform, while owning the digital billing experience across customer channels. You'll sit at the intersection of product, technology … billing migration strategy and execution Own the migration roadmap, including dependencies, risks, and key milestones Oversee transition from legacy systems with minimal/no customer disruption Ensure pricing integrity, service continuity, and regulatory compliance throughout Proactively resolve product, billing, and integration challenges Digital Product Ownership Own billing ...

play a pivotal role. This is a high-impact position where you'll lead the end-to-end migration from legacy billing systems to a modern, scalable platform , while owning the digital billing experience across customer channels. You'll sit at the intersection of product, technology … billing migration strategy and execution Own the migration roadmap, including dependencies, risks, and key milestones Oversee transition from legacy systems with minimal/no customer disruption Ensure pricing integrity, service continuity, and regulatory compliance throughout Proactively resolve product, billing, and integration challenges Digital Product Ownership Own billing ...

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 ...

DevOps Engineer to join a growing engineering capability and play a central role in shaping how AI is embedded into real, production-grade software systems . This is not a traditional people-management role . Instead, you'll lead through technical depth, architectural judgement, and delivery experience by setting … capabilities are integrated into modern software platforms. If you enjoy working where architecture, APIs, DevOps, and AI meet , and you care about building systems that are secure, operable, and genuinely useful, this role offers the chance to have real impact. What you'll be doing Your focus will ...

capabilities are integrated into modern software platforms. If you enjoy working where architecture, APIs, DevOps, and AI meet, and you care about building systems that are secure, operable, and genuinely useful, this role offers the chance to have real impact. What you'll be doing Your focus will … enabling AI within modern, API-first software platforms, particularly where legacy or existing systems need to evolve to support new capabilities safely and effectively. You will: Provide technical leadership across AI-enabled software and DevOps engineering teams Set architectural direction for API-first design, system integration ...

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 ...

Interim Integration & Systems Accountant Duration: Minimum 9 weeks (potential extension) Day Rate: Competitive (dependent on experience) Location: Hybrid/Flexible We are working on behalf of our client, a growing and acquisitive organisation, to recruit an experienced Interim Integration & Systems Accountant for an initial period of at least … across multiple entities. Key Responsibilities Lead the migration of financial data from acquired businesses into the Group ERP system Support the integration of accounting systems, processes, and controls Review and map legacy systems to ensure accurate data transfer and consistency Work closely with finance ...

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 ...

forefront of the industry. This is a rare opportunity to be part of the core technical team developing the next generation of systems to form a new foundation for the business. This position requires 3+ years of experience in building, maintaining and troubleshooting SaaS products, ideally using .NET, React … database query optimization in both Oracle SQL and TSQL is highly desirable. A willingness to dive deep into legacy on-prem systems is crucial. Key Responsibilities Build and maintain full-stack systems that run in Azure Cloud environments, both internal and client-facing Create and maintain ...

/ArcGIS) – Contract (Outside IR35) We’re supporting a major UK utilities organisation on a large-scale GIS transformation programme, migrating legacy systems to the ArcGIS platform and ESRI Utility Network model. They’re looking for a Senior Data Engineer with strong FME expertise to support data … Responsibilities Design and build data interfaces into ArcGIS Develop and test FME workflows (Readers, Transformers, Writers) Support data migration from legacy GIS systems Work closely with SMEs and technical teams to validate integrations Assist with ArcGIS data analysis and Utility Network configuration Requirements Strong hands-on experience ...

Legacy technology stacks Own the ongoing evolution of Legacy and modern platforms Drive migration from monolithic Legacy systems to scalable distributed architectures Contribute hands-on to Back End engineering, infrastructure, and platform development Define and execute engineering strategy, roadmap planning, and technical best … engineers through coaching, mentoring, and technical leadership Tech Stack AWS (EC2, ECS, Lambda, S3, SQS, SNS, DynamoDB) Node.js TypeScript PHP Terraform/CloudFormation Distributed Systems & Cloud Infrastructure About You You'll be a strong technical leader who enjoys solving complex engineering challenges while building high-performing teams. ...

Title: Senior Systems Engineer (eDV Clearance required) Location: Hybrid In London Employment Type: Permanent Salary: Up to £98,000 + package Start Date: Immediate Industry: IT Services & Consulting We’re supporting a specialist consultancy delivering cutting-edge programmes across the UK Defence and National Security space. They’re looking … Senior Systems Engineer to lead the delivery of complex, mission-critical systems across secure environments. This is a high-impact role where you’ll bridge strategy and engineering - shaping solutions that integrate cloud, data, and AI technologies into secure, safety-critical systems. Senior Systems Engineer – Key Responsibilities ...

Business & Systems LeadDudley (5 days per week on site)£50,000 to £75,000 per annumPermanent I am currently looking for a Business and Systems Analyst to join a well-established organisation based in Dudley, supporting the transformation of their back-office operations. This role is perfect … thrives on making processes more efficient, enjoys working with data, and is passionate about creating user-friendly solutions that add real value. Business & Systems Lead - What will you be doing? * Collaborating with operational teams to understand current manual processes for capturing performance data and identify opportunities for automation using ...

ownership of the technical foundations of our data platform – from ingestion and infrastructure to deployment – helping us move from legacy, on-premise systems to a modern, cloud-first data architecture. Working closely with the BI & Data Lead and an Analytics Engineer, you’ll be the primary architect … turning fragmented legacy data into a competitive, AI-ready asset. If you enjoy building things from the ground up, modernising complex systems, and shaping how data is used across a business, this role offers real ownership and influence. The Role - Data Engineer Designing a greenfield data platform ...

Senior Systems Integration Consultant (.NET, Azure, Data, MIS) Job Description Contract Length: 3 months Start: Immediate Day Rate: £400-£500 per day IR35: Outside IR35 Location: Hybrid, predominantly remote Overview We are looking for a senior Systems Integration Consultant to step into a live environment and stabilise … ensure the platform is fully operational. Key Responsibilities Stabilise and optimise Mitratech platform integration Extract and migrate data from legacy .NET systems Build and troubleshootintegrations across: Timesheet systems HR workflows including Excel exports Internal operational systems Implement workflow automation and triggers Debug live production issues ...

role focuses on the planning, execution, and management of data migration projects. Data Migration Specialists are responsible for transferring data from legacy systems to new platforms, ensuring accuracy, consistency, and adherence to data integrity standards. Analyse existing data structures and understand business requirements for data migration. Design … MySQL, NoSQL) and cloud platforms to AWS, including cloud-to-cloud scenarios. Develop data ingestion pipelines from SaaS platforms (e.g., CRM, CDP, marketing, finance systems such as Pega, Adobe, and similar tools) using APIs, connectors, or data exports. Build and maintain scalable ETL/ELT pipelines using SQL, Python ...

advanced data pipelines with Python, SQL, Spark/PySpark and Delta Lake. Champion strong data quality, governance and observability practices. Modernise legacy systems and support large-scale migrations into Azure. Provide technical leadership, set engineering standards and contribute to architectural decisions. Mentor engineers and foster a culture ...

This transition represents a significant step change in how clinical information is captured, accessed and used across the Trust. MYTT has an established Digital Systems Team responsible for the management, maintenance, development and operational stability of the Trusts major clinical digital systems. The Digital Systems Manager … member of this team and will play a pivotal role in the transition from their portfolio of legacy systems to the new EPR. Working Trustwide, the post holder provides specialist technical leadership, second line system support and expert advice to clinical and nonclinical users, ensuring systems ...

volumes of trading data and directly impacts trading performance and decision-making. You will lead a backend engineering squad working on low-latency C++ systems, while helping to modernise a complex legacy platform. A key focus will be improving release cadence and delivery maturity, alongside driving architectural … where needed, contributing to C++ and Python code in production What you will need Strong C++ experience within low-latency or real-time systems Exposure to Python (or willingness to work with it) Experience working on complex, business-critical platforms (ideally within trading or financial systems) Proven ability ...

About the job Senior Software Engineer (Backend/Systems Design) We’re working with a well-established, private equity-backed technology business operating across multiple international markets. The company builds and delivers critical, high-availability systems within sectors that demand reliability, scalability and long-term performance. Following continued … engineering team with a senior hire. This is a senior-level Software Engineer role focused on designing, building and evolving large-scale, high-capacity systems within a complex, distributed environment. The Role Design and build scalable, event-driven and distributed systems Translate product requirements into robust technical solutions ...

focused on building modern, scalable data platforms that power analytics, AI, and operational decision making. You will be working on real world, production grade systems rather than proof of concepts, with clear ownership and visibility across the full data lifecycle. What You’ll Be Doing You will be hands … Python where needed Develop real-time streaming solutions using technologies such as Kafka and Flink Integrate data from multiple sources including APIs, batch systems, and streaming platforms using AWS services like Kinesis, MSK, Lambda, and Glue Contribute to modern data architecture patterns including medallion architecture and event-driven design ...

individuals as all work will require extensive collaboration with engineers and stakeholders across many teams. Key Responsibilities: Collaborate with engineers of legacy systems to understand what data is available and the form it takes Design queries & scripts to extract and transform data from … based workflows, code reviews, and CI/CD practices. Preferred Qualifications: Have used Azure cloud services previously Experience with streaming/event-driven systems e.g., Kafka/Kinesis Experience with infrastructure as code e.g., Terraform and containerization e.g., Docker/Kubernetes Familiarity with data governance, cataloging, lineage, and privacy ...

individuals as all work will require extensive collaboration with engineers and stakeholders across many teams. Key Responsibilities: Collaborate with engineers of legacy systems to understand what data is available and the form it takes Design queries & scripts to extract and transform data from … based workflows, code reviews, and CI/CD practices. Preferred Qualifications: Have used Azure cloud services previously Experience with streaming/event-driven systems e.g., Kafka/Kinesis Experience with infrastructure as code e.g., Terraform and containerization e.g., Docker/Kubernetes Familiarity with data governance, cataloging, lineage, and privacy ...

making. You will play a key role in defining enterprise-level data architecture, engaging with stakeholders, and delivering scalable data solutions integrated with business systems and processes. This is an opportunity for an experienced data professional to combine technical expertise with client-facing consultancy and leadership responsibilities. Responsibilities • Define … data modelling across enterprise environments. • Evaluate APIs, analyse data sources, and assess data quality, integrity, and timeliness. • Reverse-engineer data models from existing systems where required. • Create Agile user stories and support engineering teams throughout delivery. • Support third-party suppliers to ensure system compatibility and integration. • Contribute to integration ...