101 to 125 of 166 Legacy Systems Jobs in London

Software Engineer - FinTech/Compliance Systems A leading organisation is seeking a Software Engineer to join its fast-paced technology function, focused on developing secure, scalable and compliant systems that support complex regulatory requirements and partner onboarding experiences. This is an exciting opportunity to work at the intersection of technology, risk management and innovation, building next-generation systems … Work with cross-functional teams to understand requirements and implement automated solutions Solve complex technical problems with a strong customer-centric focus Help automate and modernise legacy systems to reduce manual intervention and increase resilience What You'll Bring: Experience in backend software development Proficiency in Java and at least one other server-side programming language Experience … with microservices architecture and distributed systems Strong understanding of data storage technologies (MySQL, Hadoop, Cassandra) Familiarity with AWS services such as RDS, Step Functions and Kinesis (preferred) Experience with unit, integration and end-to-end testing frameworks Ability to define and monitor SLOs/KPIs and contribute to architecture design Exposure to regulatory processes or FinTech/payments Understanding More ❯

roadmap for John Lewis shops and contact centres with the overarching business objectives. Your influence will extend to key decisions that shape the operation of shop and contact centre systems and guide how engineering drives change across this complex business area. This will involve influencing how work is managedwhether agile, waterfall, or hybrid including the effectiveness and measurement of … broker models, RESTful, streams, event based). Knowledge/experience of techniques used to increase resilience and/or scalability of systems. Experience of applying techniques from Lean and Systems Thinking. Desirable skills/experience you may have Retail or Contact Centre experience Working with legacy systems Will have been a hands-on software engineer for More ❯

inefficiencies Run agent-based simulations to evaluate market structure and the behavior of LP vaults Collaborate with protocol engineering and smart contract teams to optimize vault mechanics and trading systems Improve and maintain internal research infrastructure in Python and optionally in C++ Qualifications Required Bachelor's or higher degree in Mathematics, Statistics, Computer Science, Physics, Engineering, or a related … work with large datasets and derive actionable insights from noisy financial data High agency and self-direction, with a bias toward shipping and iteration Interest in decentralized finance, trading systems, and market structure Quant Trading Track Experience designing and deploying market-making or directional trading strategies in a production setting Familiarity with high-frequency or medium-frequency strategy development … trading on a novel, high-performance EVM L1 High-impact role with direct influence on protocol design and capital strategy Fast-paced, collaborative culture with no legacy systems or bureaucracy Competitive compensation with significant token upside Flexible work environment with a primary office in London; relocation support available for strong candidates Ready to apply? Powered by First More ❯

to deeply understand our customers and deliver technology that enriches their lives. We provide smart, feature-rich financial management software designed for ambitious businesses that have outgrown basic starter systems or seek a simpler, more affordable alternative to complex, costly ERP solutions. Our cloud-based accounting software transforms the finance function, making it easier for multi-entity businesses to … those that work around finance. What you'll be doing Help designing and delivering AccountsIQ as the new finance system replacing typically smaller solutions or older legacy systems Understand new customers business model(s) and how they capture, process and report transactions Help clients understand their new GL and Analysis BI coding structure for single entity and … completed project to customer success team What you'll need 3+ years' experience implementing financial accounting software Experience and good understanding of Finance, Accounting, Budgeting and Forecasting processes, GL systems, consolidation and reporting is required Excellent verbal and written communications Confidence managing multiple tasks Creative problem-solving skills A genuine interest in learning A commitment to provide the best More ❯

Join us to make an impact on one of the world's largest e-commerce websites. The team is a backend team building internal and external APIs, enterprise distributed systems, services. Our teams operate a DevOps philosophy. You, together with the rest of your team, support in production what you build. We value delivery to production, getting data/… domain Requirements To be considered for this role, you must have 10+years of experience in software development, 5+years of experience with software design and architecture, running large scale distributed systems in production environments. You must have significant commercial experience and a passion for working in: Java Spring Boot Developing and using enterprise APIs Various testing methodologies System design at … and have mentoring experience. Maturity : You understand the necessity of the engineering vs business balance and are able to compromise efficiently. You are not afraid of legacy systems and know how to deal with them and when. You plan just right according to a situation and not too much or too little. Sensible approach when it comes More ❯

Join us to make an impact on one of the world's largest e-commerce websites. The team is a backend team building internal and external APIs, enterprise distributed systems, services. Our teams operate a DevOps philosophy. You, together with the rest of your team, support in production what you build. We value delivery to production, getting data/… and have mentoring experience. Maturity : You understand the necessity of the engineering vs business balance and are able to compromise efficiently. You are not afraid of legacy systems and know how to deal with them and when. You plan just right according to a situation and not too much or too little. Sensible approach when it comes More ❯

the UK’s leading retail organisations is seeking a contract Data Product Manager to join a strategic data migration programme , playing a critical role in transitioning legacy systems to a modern, governed data platform. 🔍 The Mission: Own and lead a core backend data platform during a major migration initiative - ensuring that data products are seamlessly and securely More ❯

the UK’s leading retail organisations is seeking a contract Data Product Manager to join a strategic data migration programme , playing a critical role in transitioning legacy systems to a modern, governed data platform. 🔍 The Mission: Own and lead a core backend data platform during a major migration initiative - ensuring that data products are seamlessly and securely More ❯

to build in-house cloud services, particularly regarding availability, troubleshooting, and cost management. Upskilling and training department staff and providing operational escalation support when required. Supporting legacy systems as needed. Following Agile methodology for planned work with tasks and time estimates on a two-week cycle. Delivering work according to design specifications and within agreed timeframes. Participating More ❯

across the data lifecycle Collaborating with Principal ML Engineers, Product Managers, and Engineering Directors to solve high-impact business problems Championing data platform evolution from fragmented legacy systems to streamlined, scalable infrastructure SKILLS AND EXPERIENCE The successful Principal Data Engineer will have the following skills and experience: 7+ years in data engineering, ideally within consumer-facing tech More ❯

removing blockers, and ensuring critical infrastructure projects are delivered with speed and precision. You’ll take ownership of key ICT initiatives including data centre exits, cloud migrations, and legacy system decommissioning. Your role will ensure that teams stay focused, obstacles are resolved quickly, and milestones are consistently achieved. Responsibilities: Own and deliver multiple infrastructure projects from scoping to More ❯

data analytics and AI to inform strategies. Implement technology practices in accordance with security, compliance, and regulatory requirements, actively managing risks. Lead digital transformation projects, modernizing legacy systems and developing digital solutions to enhance customer, client, and colleague experiences. Manage the technology team, including hiring, training, mentoring, and resource allocation to achieve team goals. Oversee technology budgets More ❯

removing blockers, and ensuring critical infrastructure projects are delivered with speed and precision. You’ll take ownership of key ICT initiatives including data centre exits, cloud migrations, and legacy system decommissioning. Your role will ensure that teams stay focused, obstacles are resolved quickly, and milestones are consistently achieved. Responsibilities: Own and deliver multiple infrastructure projects from scoping to More ❯

inform business strategies. Implementation of technology practices according to security, compliance, and regulatory requirements, actively managing risks. Digital transformation/change projects, programmes, and initiatives, modernising legacy systems and developing new digital solutions to enable customers, clients, and colleagues. Management of the technology team, including hiring, training, mentoring, and setting team goals, ensuring resources and support for More ❯

kept current. Implementation of work in accordance with policies and controls and are actively managing risks. . Digital transformation/change projects, programmes and initiatives, modernising legacy systems new and enhanced digital solutions to enable customers, clients and colleagues Management of the technology team includes hiring, training, mentoring, and setting and achieving team goals and ensuring that More ❯

all business units to help distribution provide focus in our underwriting approach for best value operational return Help provide feedback and direction as we transition from legacy systems to guidewire and implement salesforce into the business Perform other duties as assigned What Will Our Ideal Candidate Have? Previous experience in a similar role The ability to translate More ❯

job requisition id JR Agency : Havas Group Job Description : Plan and direct the information processing activities of the organization and coordinate the effective design, implementation and operation of information systems and applications. Job Title: IT Infrastructure Manager Location: Hybrid (London HQ and remote working) About Us: We are seeking a hands-on IT Infrastructure Manager to join our Infrastructure … team. This role involves supporting our current systems and services, as well as leading new projects, solutions, and platforms across both on-premise and cloud environments. Havas Group is a global communications company, delivering advertising, marketing and media buying to many UK and global clients. Havas IT provides all aspects of IT services to the UK and IE based … to detail and a commitment to thorough documentation. Cloud Hosting: Experience with IaaS/PaaS/SaaS hosting (preferably Azure), including the consolidation and modernization of legacy systems to fit cloud environments. Relevant certifications in support and architecture. Networking: Robust networking background, with experience in managing multiple sites from firewalls to edge switches (Palo Alto, HP, Cisco More ❯

modernisation program. You'll lead the management and evolution of test environments, ensuring they are reliable, scalable, and aligned with strategic goals. The role spans both legacy systems and new services, requiring a blend of technical expertise, environment oversight, and collaboration across teams. Key Responsibilities: Strategy & Planning : Help define and implement a test environment strategy aligned with More ❯

stack from the ground up. This isn't a plug-and-play dashboarding role. This is hands-on transformation work. They're mid-project, moving from legacy systems into Snowflake . SIGMA is being rolled out as the new reporting tool. What they need is someone who can translate messy data into clean, usable insights - and build More ❯

AI to extract insights and inform strategies. Implement technology practices that comply with security, regulatory, and policy requirements, actively managing risks. Lead digital transformation projects, modernizing legacy systems and developing digital solutions to enhance customer, client, and colleague experiences. Manage the technology team through hiring, training, mentoring, and resource allocation to ensure team success. Oversee technology budgets More ❯

kept current. Implementation of work in accordance with policies and controls and are actively managing risks. . Digital transformation/change projects, programmes and initiatives, modernising legacy systems new and enhanced digital solutions to enable customers, clients and colleagues Management of the technology team includes hiring, training, mentoring, and setting and achieving team goals and ensuring that More ❯

experience. Evaluating and integrating CRM and Commerce solutions from leading platforms (Salesforce, Microsoft, Oracle, etc.) based on client needs. Designing architectures that integrate CRM and commerce solutions with ERP systems, data platforms, analytics tools (Tableau, Power BI), and external systems. Leading large-scale digital transformation projects, ensuring CRM solutions align with ERP, data lakes, cloud infrastructure, and CI/… or retail sectors. Proven experience with CRM platforms like Salesforce, SAP, Microsoft Dynamics, or Oracle across sales, service, and marketing functions. Expertise in delivering complex CRM integrations with external systems such as Data Lakes, ERP, and analytical platforms. Experience with commerce platforms (e.g., Salesforce Commerce Cloud, Adobe Commerce) and integration tools (e.g., Mulesoft, Dell Boomi). Knowledge of legacy More ❯

a day to day basis. Be a trusted and respected leader. Building and running a highly effective team that delivers customer outcomes and develops the team and individuals. Introduce systems, processes and experience to improve delivery output. Support business development initiatives and produce compelling consultancy propositions for public sector opportunities. Draw on your sector network and take responsibility for … a day to day basis. Be a trusted and respected leader. Building and running a highly effective team that delivers customer outcomes and develops the team and individuals. Introduce systems, processes and experience to improve delivery output. Support business development initiatives and produce compelling consultancy propositions for public sector opportunities. Draw on your sector network and take responsibility for … Infrastructure (CNI), ideally across energy generation, utilities, or similar regulated sectors. Strong understanding of Operational Technology (OT) environments, with hands-on experience in securing and modernising legacy systems, including DCS, SCADA, and ICS, aligned to NCSC CAF, IEC 62443, and NIST 800-82. Direct experience supporting Ofgem regulatory reporting and compliance, including preparation of ISSA returns More ❯

international environment. This is not a “keep the lights on” role. We’re looking for a visionary technology leader with a proven track record in modernising legacy systems, managing strategic IT budgets, and building empowered, high-performing teams. Key Responsibilities: Drive a technology and AI-led transformation , delivering secure, scalable digital solutions. Lead global cybersecurity, data protection … IT programmes , vendor relationships, and risk management frameworks. Shape the organisation’s AI strategy and explore emerging technologies for impact. You’ll Bring: Deep knowledge of IT infrastructure, digital systems, and data governance . Expertise in UK/EU GDPR, ISO27001 , and cybersecurity best practices. Strong background in enterprise architecture and legacy system transformation. Strategic leadership experience More ❯

international environment. This is not a “keep the lights on” role. We’re looking for a visionary technology leader with a proven track record in modernising legacy systems, managing strategic IT budgets, and building empowered, high-performing teams. Key Responsibilities: Drive a technology and AI-led transformation , delivering secure, scalable digital solutions. Lead global cybersecurity, data protection … IT programmes , vendor relationships, and risk management frameworks. Shape the organisation’s AI strategy and explore emerging technologies for impact. You’ll Bring: Deep knowledge of IT infrastructure, digital systems, and data governance . Expertise in UK/EU GDPR, ISO27001 , and cybersecurity best practices. Strong background in enterprise architecture and legacy system transformation. Strategic leadership experience More ❯