51 to 75 of 86 Legacy Systems Jobs in London

that powers the entire engineering organisation. This is a genuinely high-impact role in a greenfield environment, where you’ll help shape the build systems, developer workflows, and CI infrastructure from the ground up. What you’ll be working on: • Designing and owning Bazel rules and extensions • Scaling … closely with teams across AI/ML, Runtime, Simulation, Compilers, and Hardware Why this role stands out: • Greenfield environment with no legacy systems • Huge technical variety across software, ML, infrastructure, and hardware • High ownership and visibility across the business • Opportunity to define how engineering operates ...

supporting modern data platform, with a particular focus on Databricks, cloud-based data engineering, and leading the migration of legacy Oracle systems into scalable, cloud-native environments. The role supports the organisation's data strategy especially on Finance and Regulatory domain by ensuring high-quality, reliable pipelines … environment management. Ensure governance, performance optimisation. Legacy Oracle Migration Leadership Lead and coordinate the migration of data assets from Oracle database systems to the modern cloud data platform. Oversee source-to-target mapping, data model redesign, and automated migration frameworks. Define strategy for retiring legacy ...

background. The successful candidate must have strong experience in Microsoft Teams Voice administration and end-to-end UC migrations , particularly transitioning services from legacy voice platforms (PSTN, Avaya, etc.) to MS Teams . This is an on-site role across East London, Luton, and Bedfordshire , with frequent travel … certified handsets (Yealink or equivalent). Apply best practice for numbering, naming conventions, and governance. Telephony Migrations & Support Migrate services from legacy systems (Avaya, BT, MSD, PSTN, etc). Coordinate number PORTs with telco suppliers and ensure smooth cutovers. Test inbound/outbound routing, call flows ...

Engineer | London | Up To £140,000 + Equity We’re working with a well-backed early-stage AI company building enterprise-grade generative AI systems for complex, high-value workflows. The team is small, technical, and moving fast - they’re now looking for a Founding AI Engineer to help … shape both the product and engineering culture from the ground up. This is not a “maintain legacy systems” type role. You’ll be joining at the stage where architecture decisions still matter, product direction changes weekly, and exceptional engineers can have outsized impact. The focus ...

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 … where you built and shaped teams A true lifetime software engineer - you have written production code across your career, led architecture decisions on complex systems, and built engineering cultures that ship Deep passion for how AI is transforming software engineering - you are already using AI native development tools ...

across core back-office platforms including HR, Finance, and ERP. You'll lead the design of scalable, integrated architectures that modernise legacy systems and enable efficient, data-driven operations. Acting as a subject matter expert, you'll define target architecture, support business cases, and ensure technology choices … party providers, and guide teams to deliver high-value outcomes. We're looking for a pragmatic, influential architect with strong experience across HRIS, finance systems, ERP platforms, and enterprise integration within complex environments. A key role driving the evolution of critical business systems. ...

with human expertise to make complex services accessible, scalable and radically better for everyone. The industry has long been constrained by legacy systems and slow-moving processes. They’ve rebuilt the model from first principles, with a proprietary AI-native platform at its core—designed to amplify … scale-ups or own venture and having led 30+ Engineers) with strong technical depth, high standards, and a passion for building both great systems and great teams. You care about craft, not just output—and you know how to scale both people and platforms without compromising either. The Offer ...

Engineering, Head of Payments, etc.) to position digital transformation initiatives and custom technology solutions. Identify client challenges around legacy systems, payments infrastructure modernization, platform engineering, data and AI, and cloud adoption, and position Endava’s services as the solution. Lead the development of proposals, solution positioning ...

engineer. No bloat, no politics, just PhDs and the sharpest technical minds you'll work with. You'll be building brownfield and greenfield systems that handle cutting-edge inference and infrastructure challenges at the frontier of what's possible. This is genuine engineering ownership. You'll shape core architecture … structure is flat, and you'll have the autonomy to make meaningful decisions that matter. If you've been stuck maintaining legacy systems or dealing with red tape, this is the opposite. No explaining technical decisions to non-technical stakeholders. No layers of approval. Just smart people ...

underpins Outsmart’s crowdsourcing operations – a mature, revenue-generating system that has evolved over years and continues to scale. If you enjoy owning real systems, thinking architecturally, improving legacy code thoughtfully rather than rewriting it, and being trusted to deliver without heavy supervision, this role will feel … unusually well-matched. The role As Senior Fullstack Software Engineer, you will help design, build and maintain the production systems that power Outsmart’s platform. You’ll work closely with our CTO, operating as a high-agency individual contributor with genuine ownership across backend systems, infrastructure and platform ...

across core back-office platforms including HR, Finance, and ERP. You'll lead the design of scalable, integrated architectures that modernise legacy systems and enable efficient, data-driven operations. Acting as a subject matter expert, you'll define ta... ZIPC1_UKTJ ...

leading technology firm in Greater London is seeking a Head of Technology to drive the transformation of legacy systems to modern cloud platforms. The ideal candidate will lead teams in developing and implementing technology strategies, engage with stakeholders, and possess a strong background in Java development ...

just a technical rollout; it's a strategic unification of UK and Iberian operations. You will lead the charge in decommissioning legacy systems (MS Dynamics NAV/ECC) and implementing a standardized S/4HANA template that will serve as the blueprint for the entire EMEA region. ...

just a technical rollout; it's a strategic unification of UK and Iberian operations. You will lead the charge in decommissioning legacy systems (MS Dynamics NAV/ECC) and implementing a standardized S/4HANA template that will serve as the blueprint for the entire EMEA region. ...

aligned to our technology strategy. You will partner with Product, Platform, Cyber, Operations, Change and business stakeholders to reduce complexity, modernise legacy systems and support confident decision making across the organisation. Location: Hybrid (Stansted - 3 days per week, 2 days remote) Responsibilities Define and maintain our enterprise ...

traffic environment. What You’ll Do Lead React Native and hybrid mobile strategy across iOS & Android Navigate brownfield architecture and modernise legacy systems Decide when to go hybrid vs native Drive architecture, POCs, and integration (Swift/Kotlin + React Native) Shape tools, standards, and engineering practices ...

influence over the product, technology and wider company direction. You won’t be joining a heavily layered corporate environment or maintaining legacy systems with little visibility over impact. The team is lean, collaborative and highly product-focused, with close working relationships across founders, product, engineering and operations. … There is genuine opportunity to: • Build products and systems from the ground up • Shape how the platform evolves as the business scales • Solve complex real-world operational problems • Influence product direction and decision-making • Operate with high ownership and autonomy • Work closely with founders and senior stakeholders • Have visible ...

Data Services, and other ETL/integration tools, ensuring scalability and repeatability across multi-wave programmes. Lead complex data conversion activities across SAP systems, including HR (SuccessFactors & Payroll), Supply Chain (EWM), and Master Data governance platforms (MDG). Drive cutover planning and execution from a data perspective, ensuring predictable … planning, reconciliation, and alignment with business timelines. Define and oversee reconciliation, validation, and audit processes to ensure data completeness, accuracy, and integrity across all systems in scope. Facilitate data design and migration workshops with business stakeholders, translating requirements into data models, mappings, and transformation rules across multiple functional domains. ...

Transaction reporting ), is a market-leading solution for regulatory transaction reporting and reconciliation across global regimes. En:ACT automates reporting, reconciles data across systems, and maps errors directly to regulatory rules, helping firms remediate quickly, reduce risk, and meet regulatory obligations with confidence. Already trusted by more than … join at a pivotal stage as we modernize our data infrastructure, migrating from Python scripts and MySQL to Databricks and Snowflake. Our systems power regulatory reporting for major financial institutions, requiring precision, traceability, and reliability. What You'll Do Design and evolve our configuration-driven data framework in Databricks ...

deliver. Your work will directly improve platform reliability, scalability, and reuse-enabling faster delivery of fixed income index capabilities while reducing fragmentation across legacy systems. A key focus of this role is leading a high-impact Fixed Income platform consolidation and migration programme -aligning stakeholders, governing delivery … Product Owner and/or Business Analyst roles in an agile environment, owning backlogs and translating requirements into deliverable work. Experience in platform or systems migration and/or major change delivery , including dependency management, governance routines, and cutover readiness. Strong understanding of fixed income index products , index lifecycle ...

Webhook integrations, and Event-Driven Architecture using Kafka or Azure Event Hubs. Legacy-to-Cloud: Demonstrable experience migrating legacy monolithic systems into containerised microservices architectures. Tooling: Proficient in Visio or LucidChart for architectural modelling; disciplined in Confluence for documentation practices. Duties Blueprint Delivery: Develop high … deliverables meet internal quality, security, and scalability thresholds. Data Integration Leadership: Orchestrate complex data mapping between legacy IBM iSeries (DB2/RPG) systems and modern API middleware - a technically demanding challenge requiring deep integration expertise. Systemic Remediation: Lead deep-dive investigations into recurring platform failures error surges ...

Webhook integrations, and Event-Driven Architecture using Kafka or Azure Event Hubs. Legacy-to-Cloud: Demonstrable experience migrating legacy monolithic systems into containerised microservices architectures. Tooling: Proficient in Visio or LucidChart for architectural modelling; disciplined in Confluence for documentation practices. Duties Blueprint Delivery: Develop high … deliverables meet internal quality, security, and scalability thresholds. Data Integration Leadership: Orchestrate complex data mapping between legacy IBM iSeries (DB2/RPG) systems and modern API middleware - a technically demanding challenge requiring deep integration expertise. Systemic Remediation: Lead deep-dive investigations into recurring platform failures error surges ...

completion largely autonomously. This is a hands-on, high-ownership role. It will suit a commercially minded engineer who is equally comfortable refactoring legacy PHP, upgrading Linux servers, cutting responsive HTML5 and CSS from a designer's mockup, and scripting automations that remove friction for Finance, Marketing … with the ability to translate designer output into production-quality, responsive markup. • Track record of building integrations and automations against third-party APIs (finance systems, marketing platforms, internal tooling). • Active, deliberate use of AI coding assistants such as Claude Code, and the judgement to know when to lean ...

cloud-based securities processing platform used by global institutions. This role focuses on data integration, migration and modernisation, connecting cloud platforms with complex legacy systems. Role Description: The PTP Platform is a leading-edge, cloud-based Securities Processing solution that provides trade lifecycle processing for a wide range … services/capital markets experience . Knowledge of trade lifecycle processing . ETL and data warehouse experience . Docker and Kubernetes exposure . Distributed systems experience (Kafka, microservices, event streaming) . Full Stack Engineer (Data) Based in the City of London (2 days in the office)/6 months ...

Manager to take a leading role. This is a rare opportunity to drive a complex, multi-country rollout, moving from legacy ERP systems to Oracle Fusion Cloud across Finance and SCM , impacting over 12 countries globally with a strong European focus. The Role You’ll be responsible ...