26 to 50 of 109 Legacy Systems Jobs in London

of data models for data warehouses and analytics platforms . M odelling unstructured, semi structured and structured data . M odelling the migration of data from legacy systems . U sing data modelling tools such as ER/Studio, ERwin , dbt , or similar . W riting complex SQL or Python queries and understanding data profiling techniques . … with cloud-based data platforms e.g. Azure Synapse . A pplying data governance and data quality principles in modelling work . H olding a degree in computer science, information systems, or a related field or equivalent experience . H aving extensive experience in data modelling or related roles . H olding relevant certifications (e.g. Azure Data Fundamentals, DAMA CDMP More ❯

provide technical guidance and oversight of customisations, including plugins, workflows, Power Automate flows, and JavaScript, ensuring efficient, reusable, and well-documented code.* Integrate D365 CE with other applications and systems using tools like Azure Logic Apps, Power Automate, and custom APIs.* Oversee the Dynamics 365 environment to enable the successful delivery of their Digital Transformation.* Manage and control D365 … and maintenance for D365 CE applications, troubleshoot issues, and implement fixes and enhancements.* Assist in data migration tasks, ensuring accurate and secure transfer of data from legacy systems to D365 CE* Collaborate with cross-functional teams, including business analysts, project managers, and other developers, to deliver high-quality solutions.* Stay updated with the latest D365 CE features More ❯

of the cryptocurrency ecosystem. About the role: This role sits within GSR's global Data Engineering team, where you'll contribute to the design and development of scalable data systems that support our trading and business operations. You'll work closely with stakeholders across the firm to build and maintain pipelines, manage data infrastructure, and ensure data is reliable … responsibilities may include: Build and maintain scalable, efficient ETL/ELT pipelines for both real-time and batch processing. Integrate data from APIs, streaming platforms, and legacy systems, with a focus on data quality and reliability. Design and manage data storage solutions, including databases, warehouses, and lakes. Leverage cloud-native services and distributed processing tools (e.g., Apache More ❯

central/local government, healthcare, education, defence, etc. Familiarity with public sector regulations, compliance (e.g., GDPR, FOIA), and procurement processes. Knowledge of common public sector challenges: legacy systems, citizen engagement, case management, grants, licensing. Proficiency in key Salesforce architecture areas, particularly Service Cloud, Experience Cloud, and Public Sector Cloud. Public Sector Solutions Accredited Professional and Service Cloud More ❯

client satisfaction. Required Certifications: Oracle Financials Cloud: General Ledger 2023 Certified Implementation Professional (or latest version) Oracle E-Business Suite R12 Financials Certified Expert (preferred for legacy systems) ITIL Foundation Certification (preferred) Security Clearance: Must hold valid UK government security clearance or be eligible to obtain it. Bonus Skills: Experience with other Oracle SaaS modules. Background in More ❯

programming languages - you're a polyglot who chooses tools pragmatically , Strong fundamentals in system design, software architecture, and data modelling , Deep experience working in complex domains - such as financial systems, logistics, or workflow-heavy platforms , Hands-on experience with relational databases (PostgreSQL preferred) , Comfortable working in an event-driven, modular monolith environment , Experience with refactoring legacy systems … implementation-focused, with strong scope for architectural input , If you're driven by complex domains, clean abstractions, and high-impact ownership, this is for you , Behind the scenes, our systems model deep commercial logic, financial rules, and real-world operations at scale , We're moving fast, redesigning our architecture for the next chapter, and hiring exceptional engineers to help … us build the future of global trade in drinks , Own the design and implementation of backend systems driving business-critical workflows, financial calculations, and operational tooling , Model domain complexity using DDD and other architectural approaches across an event-driven modular monolith , Shape and evolve our architecture as we transition from Java to Node.js/TypeScript in a modern AWS More ❯

services, we are investing heavily in data as a key enabler of our future success. We are currently undertaking a five-year programme to transition from legacy systems to modern, cloud-based technologies. Our Microsoft-based technology stack (including Azure and Purview) underpins this transformation, and we are building a forward-thinking data governance capability that delivers … with FCA regulations and industry best practice. Partner with business and technology stakeholders to embed governance processes that deliver value and efficiency. Support the migration of data from legacy platforms to our new cloud-based Microsoft stack, ensuring data quality, lineage, and accessibility. Own and drive policies on data ownership, classification, retention, and access management. Leverage Microsoft Purview More ❯

product owners, and external partners to shape scalable data solutions Manage and mentor a high-performing team of Data Engineers Support integration initiatives across cloud and legacy systems Represent data architecture in governance forums and strategic planning What You’ll Bring Proven experience designing and architecting complex, high-volume data systems Strong hands-on knowledge of … collaborative culture This is a rare opportunity to shape the data architecture of a mission-driven organisation with global reach. If you're passionate about data, leadership, and building systems that scale—this is your next move. More ❯

The Role Deliver new backend functionality in modern .NET (C#/.NET 8) Help integrate and validate React UIs Contribute to ongoing rebuild and refactor of legacy systems Work with REST & GraphQL APIs for third-party platform integrations Collaborate closely with a small, experienced team in a flat structure Remote-first – work from anywhere in the UK … Tech Stack Backend: .NET 8, C#, Azure, PostgreSQL Frontend: React, Vue (legacy), Loveable (low-code React generator) Tools: GitHub … Actions, Azure Service Fabric, Supabase Integrations: Shopify, other e-commerce APIs You’ll Need Strong experience with modern .NET (6, 7, or 8) Solid understanding of APIs and backend systems Comfortable reviewing and working with React (even if not the main focus) Excellent communication and collaboration skills Self-starter mentality – able to deliver independently Nice to Have: Azure experience More ❯

Lead on a Contract basis. The role will cover all aspects of Technology delivery for the programme, including, and not limited to Data Migration, Archiving, Reporting, Design Authority, Legacy System Decommissioning, SAP System Support and Integration. About the role: Based in Central London (Hybrid - 3 days on site): Ensure leadership alignment and understanding of the Technology workstream ambition More ❯

Backend Engineer - Scale Systems with Real Impact Tired of tinkering at the edges? Want to actually shape the backbone of a platform that's transforming how the world's biggest enterprises run their tech? This is one of those rare roles where you get in early, build the foundations, and watch your work scale across global businesses. We're … AI-driven platform is already saving household-name customers millions in IT costs, shaving months off ERP project timelines, and making sense of the mess that legacy systems leave behind. SAP is just the beginning - they're building a whole new category of Enterprise System Intelligence. The Role As one of the first Backend Engineers focused on … platform and infrastructure, you'll: Build core systems capable of handling tens of millions of lines of code and large-scale LLM workloads. Own big pieces of the architecture - from job orchestration to APIs, infra, and developer tooling. Make product teams fly by building reliable, well-designed infrastructure that scales without slowing anyone down. Tame complex LLM infrastructure (real More ❯

or Brighton Join a leading international eCommerce organization committed to driving innovation through AI. We are looking for a Senior Frontend Developer to lead the modernization of our core systems, utilizing React and JavaScript to enhance performance and efficiency. Your expertise will be key in transforming our technology stack and implementing AI-powered solutions. About the Role: Play a … pivotal role in transforming our technology stack and driving the adoption of AI-powered tools to enhance development workflows. Modernize critical systems and implement intelligent solutions that support business growth and efficiency. Key Responsibilities: Lead the migration of legacy systems to a modern tech stack using React, JavaScript, and cloud platforms. Design and implement AI-driven More ❯

We are seeking an experienced FoxPro Developer to join our Client and play a key role in supporting and transitioning their legacy systems to a modern platform. This is a unique opportunity for someone with deep knowledge of FoxPro who enjoys solving business challenges, supporting existing applications, and helping shape the next generation of systems. Responsibilities: Maintain … existing FoxPro application, ensuring smooth day-to-day operations. Work closely with business users to understand workflows and processes. Assist in re-writing and porting functionality from the legacy application into the new platform. Implement new features and enhancements as requested during the migration process. Provide ongoing support and troubleshooting until the legacy system is fully More ❯

ownership of your technical products – a mix of bespoke builds and third-party solutions. Oversee the execution of data initiatives , ensuring accurate integration, transformation, and flow of data across systems, while aligning technical delivery with business priorities and regulatory requirements. Contribute to aligning delivery with overall business goals, helping drive growth, process efficiencies, and digital transformation. Play a central … maturity across the organisation, holding technology teams accountable for delivery. Partner closely with the Head of Technology on technical decisions and data strategy. Influence decisions around legacy systems, streamline processes in collaboration with Technology, and contribute to global transformation initiatives. Required Skills & Expertise: Minimum of 5 years’ experience in a Product Owner or Technical Business Analyst role More ❯

Demonstrable London Market software selection/delivery/integration experience Knowledge of the Insurance Policy/Claims Admin System landscape Experience of previous projects moving from legacy systems to updated versions (software/hardware/integration) and able to articulate the role(s) played Sound like you? Please get your details over to ARC IT ASAP More ❯

team to improve how they build and release their applications Support development teams in onboarding to a standard CI/CD pipeline Troubleshoot technical challenges including legacy systems, tooling migrations, and testing gaps Encourage sustainable practices like test automation, trunk-based development, and containerization Proven skills and experience to help succeed in this role include: Proven experience More ❯

join their London-based office as part of a large finance ERP implementation programme. This role is central to the integration workstream, supporting the transition from legacy systems to a legal-specific ERP.Job Details:Start date: ASAPDuration: until March 2027 initiallyRate: £600-£670pd Inside IR35 via UmbrellaLocation: LondonHybrid: 3 days in the officeKey Requirements: Proven experience as More ❯

multiple development efforts to ensure alignment with requirements, expectations, and compliance regulations. Collaborate with programmers, database administrators, and technical specialists. Work closely with analysts to understand legacy systems, business processes, and data. Build expertise in ERP implementation/Support best practices. Lead and execute functional testing, including test scenario development, documentation, and validation testing for interfaces and More ❯

multiple development efforts to ensure alignment with requirements, expectations, and compliance regulations. Collaborate with programmers, database administrators, and technical specialists. Work closely with analysts to understand legacy systems, business processes, and data. Build expertise in ERP implementation/Support best practices. Lead and execute functional testing, including test scenario development, documentation, and validation testing for interfaces and More ❯

multiple development efforts to ensure alignment with requirements, expectations, and compliance regulations. Collaborate with programmers, database administrators, and technical specialists. Work closely with analysts to understand legacy systems, business processes, and data. Build expertise in ERP implementation/Support best practices. Lead and execute functional testing, including test scenario development, documentation, and validation testing for interfaces and More ❯

multiple development efforts to ensure alignment with requirements, expectations, and compliance regulations. Collaborate with programmers, database administrators, and technical specialists. Work closely with analysts to understand legacy systems, business processes, and data. Build expertise in ERP implementation/Support best practices. Lead and execute functional testing, including test scenario development, documentation, and validation testing for interfaces and More ❯

environment Provide technical direction and architectural oversight for complex projects Stay hands-on with coding, problem-solving, and technical delivery Shape the technology roadmap, working across legacy systems and cutting-edge AI projects Drive technical standards and ensure delivery against ambitious targets Work closely with leadership to translate business needs into technical solutions Technical Stack & Experience: Strong … PHP experience (Laravel framework) Database expertise: MySQL, Elasticsearch Front-end knowledge: Vue.js or similar modern frameworks Understanding of DevOps practices (GitHub, Terraform advantageous) AI systems experience is a plus Previous experience in scaling tech companies or start-ups highly valuable What's On Offer: Competitive base salary equity Remote-first culture 1 day a week in the London office … Opportunity to join at a pivotal scaling moment with rapid career progression potential Work on diverse projects from legacy optimisation to cutting-edge AI deployment This is your chance to step into a leadership role where you can directly influence both technology direction and team culture at one of the UK's most exciting PropTech growth stories. The More ❯

transformation. After 15+ years of success, they're rebuilding core platforms from the ground up - modernising everything and scaling globally. Projects You'll Work On: Rebuilding legacy systems using Laravel & Vue.js Driving adoption of the full TALL stack (Tailwind, Alpine.js, Laravel, Livewire) Building new customer-facing tools, portals, and automation features Improving performance and scalability across high … traffic systems Supporting a long-term product roadmap across multiple business units The Stack: PHP (Laravel) Tailwind, Alpine.js, Livewire Vue 2 & 3 Agile/CI/TDD mindset The Setup: Hybrid - 3 days in-office for collaboration and 2 days from home (more flex offered) 3-stage interview process and super quick turnaround Competitive salary + bonus 25 days More ❯

ideal candidate will have deep expertise in Delphi (especially versions like Delphi 7, XE, or later), a strong understanding of object-oriented programming, and experience integrating legacy systems with modern architectures. Key Responsibilities: Design, develop, test, and maintain software applications using Delphi. Analyze legacy Delphi code and recommend enhancements or modernization strategies. Collaborate with cross More ❯

ideal candidate will have deep expertise in Delphi (especially versions like Delphi 7, XE, or later), a strong understanding of object-oriented programming, and experience integrating legacy systems with modern architectures. Key Responsibilities: Design, develop, test, and maintain software applications using Delphi. Analyze legacy Delphi code and recommend enhancements or modernization strategies. Collaborate with cross More ❯