101 to 125 of 131 Legacy Systems Jobs in the City of London

Month Contract Outside IR35 Oracle Fusion Cloud HCM Business Analyst We are working with a client that is embarking on a transformation drive across their ERP and HR systems, implementing Oracle Fusion HCM to replace over 50 legacy systems and create a single, standardised HR platform. The business needs an experienced business analyst with strong system … design expertise to join the program immediately and act as the key liaison between the HR team and the systems integrator. This requires someone who understands HR business needs, can interpret the capabilities of Oracle Fusion HCM, and help shape effective solutions and challenge the status quo. Joining at the very beginning before process design has started. This is More ❯

Month Contract Outside IR35 Oracle Fusion Cloud HCM Business Analyst We are working with a client that is embarking on a transformation drive across their ERP and HR systems, implementing Oracle Fusion HCM to replace over 50 legacy systems and create a single, standardised HR platform. The business needs an experienced business analyst with strong system … design expertise to join the program immediately and act as the key liaison between the HR team and the systems integrator. This requires someone who understands HR business needs, can interpret the capabilities of Oracle Fusion HCM, and help shape effective solutions and challenge the status quo. Joining at the very beginning before process design has started. This is More ❯

evolving the backbone of our platform. This is not a maintenance gig — it’s a high-impact, architecture-focused role where your decisions will shape the future of our systems and influence how businesses across the UK interact with their energy supply. Your day-to-day will include: Architecting and building reliable, scalable systems to support our software … We’re Looking For 💻 Deep expertise across the stack , especially in JavaScript/TypeScript, SQL databases, and AWS infrastructure. 🧱 Strong architectural instincts – you’ve designed and delivered robust, scalable systems before. 🔧 Hands-on refactoring experience – you're comfortable navigating legacy systems and improving them iteratively. 👥 Team-first mindset – you’re humble, collaborative, and put outcomes above More ❯

evolving the backbone of our platform. This is not a maintenance gig — it’s a high-impact, architecture-focused role where your decisions will shape the future of our systems and influence how businesses across the UK interact with their energy supply. Your day-to-day will include: Architecting and building reliable, scalable systems to support our software … We’re Looking For 💻 Deep expertise across the stack , especially in JavaScript/TypeScript, SQL databases, and AWS infrastructure. 🧱 Strong architectural instincts – you’ve designed and delivered robust, scalable systems before. 🔧 Hands-on refactoring experience – you're comfortable navigating legacy systems and improving them iteratively. 👥 Team-first mindset – you’re humble, collaborative, and put outcomes above More ❯

Triggers Hybrid London 1-2 days a week £(Apply online only) (Outside IR35) The reason they're hiring now, they have a client that is all on a legacy system, on-prem platform, and they want to build out their AWS platform. They want to do a High-level architecture design to take to the low-level design. More ❯

Using GCP), defining data strategy and architecture from the ground up. This is more than just governance — it’s a chance to solve big problems, modernise legacy systems, and create reusable, scalable data products that unlock business value. Key Responsibilities: Shaping data strategy and architecture roadmap Designing scalable models and integration patterns Leading on cloud data tech More ❯

Using GCP), defining data strategy and architecture from the ground up. This is more than just governance — it’s a chance to solve big problems, modernise legacy systems, and create reusable, scalable data products that unlock business value. Key Responsibilities: Shaping data strategy and architecture roadmap Designing scalable models and integration patterns Leading on cloud data tech More ❯

will take full ownership of a large-scale Windows Server migration programme. The scope includes upgrading servers currently running Windows Servers, and addressing a small number of additional legacy systems. This role requires a proven subject matter expert in Windows Server migrations who is comfortable operating across multiple environments that include a complex mix of both legacy More ❯

Systems Trainer – Student Systems Implementation Fixed-Term until October 2026 | £36k - £42k | Hybrid – London 1-2 day/week Are you experienced in delivering high-quality systems training and end-user support within large, complex environments? Are you excited by the idea of playing a key role in the successful rollout of a major student systems implementation? We’re looking for a confident and proactive Systems Trainer/Lead to join a major transformation programme at a forward-thinking university who are undergoing a massive transformation project. Role: Systems Training Lead Employment Type : FTC until October 2026 initially Location : London 1-2 days a week onsite but this is not regular Salary … embedding new digital capabilities across the student lifecycle. What You'll Be Doing Working closely with SMEs in designing and delivering engaging training sessions and materials for new student systems as per releases (Release one is Admissions) Providing first-line support and expert advice to system users across multiple departments Advising on best practice use of the system to More ❯

Systems Trainer – Student Systems Implementation Fixed-Term until October 2026 | £36k - £42k | Hybrid – London 1-2 day/week Are you experienced in delivering high-quality systems training and end-user support within large, complex environments? Are you excited by the idea of playing a key role in the successful rollout of a major student systems implementation? We’re looking for a confident and proactive Systems Trainer/Lead to join a major transformation programme at a forward-thinking university who are undergoing a massive transformation project. Role: Systems Training Lead Employment Type : FTC until October 2026 initially Location : London 1-2 days a week onsite but this is not regular Salary … embedding new digital capabilities across the student lifecycle. What You'll Be Doing Working closely with SMEs in designing and delivering engaging training sessions and materials for new student systems as per releases (Release one is Admissions) Providing first-line support and expert advice to system users across multiple departments Advising on best practice use of the system to More ❯

these into NetSuite’s functionality Designing and configuring NetSuite system to meet the client’s business needs across Finance, E-commerce, Procurement etc. Migrating data from legacy systems to NetSuite Providing systems support, carrying out troubleshooting and diagnosis of software issues Providing systems training to end-users Keeping up-to-date with NetSuite’s latest More ❯

these into NetSuite’s functionality Designing and configuring NetSuite system to meet the client’s business needs across Finance, E-commerce, Procurement etc. Migrating data from legacy systems to NetSuite Providing systems support, carrying out troubleshooting and diagnosis of software issues Providing systems training to end-users Keeping up-to-date with NetSuite’s latest More ❯

these into NetSuite’s functionality Designing and configuring NetSuite system to meet the client’s business needs across Finance, E-commerce, Procurement, etc. Migrating data from legacy systems to NetSuite Providing systems support, troubleshooting, and diagnosing software issues Providing systems training to end-users Keeping up-to-date with NetSuite’s latest functionalities #J More ❯

entering a pivotal phase of its technology evolution. With operations across multiple international offices and a 20+ year history of growth, the company is transitioning from legacy systems to a modern, data-centric infrastructure inspired by top-tier professional services models. A newly organized, high-integrity data environment is now in place, laying the foundation for building … team performance. Productization & Process Optimization: Transform KPIs into user-centric tools and dashboards that influence consumer behavior, focusing on both speed and delivery quality. Tool Integration: Act as a systems integrator—identify, vet, and scale best-in-class third-party tools to streamline workflows and ensure adoption across a 1,500+ user base. Team Leadership: Rebuild and lead a … user services organization. Demonstrable track record of translating business strategy into rapid, measurable commercial outcomes through technology. Strong expertise in data engineering, data science principles, BI, product management, and systems integration. Experience productizing KPIs and driving user adoption of technology tools across a large, distributed sales-oriented workforce. Hands-on leader, capable of being "in with the troops" and More ❯

entering a pivotal phase of its technology evolution. With operations across multiple international offices and a 20+ year history of growth, the company is transitioning from legacy systems to a modern, data-centric infrastructure inspired by top-tier professional services models. A newly organized, high-integrity data environment is now in place, laying the foundation for building … team performance. Productization & Process Optimization: Transform KPIs into user-centric tools and dashboards that influence consumer behavior, focusing on both speed and delivery quality. Tool Integration: Act as a systems integrator—identify, vet, and scale best-in-class third-party tools to streamline workflows and ensure adoption across a 1,500+ user base. Team Leadership: Rebuild and lead a … user services organization. Demonstrable track record of translating business strategy into rapid, measurable commercial outcomes through technology. Strong expertise in data engineering, data science principles, BI, product management, and systems integration. Experience productizing KPIs and driving user adoption of technology tools across a large, distributed sales-oriented workforce. Hands-on leader, capable of being "in with the troops" and 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 ❯

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 ❯

days on site Company: We are partnered with a client in the Home Counties undergoing a major Digital Transformation programme. This initiative will modernise their legacy systems and transform both their IT infrastructure and operational processes. With a strong emphasis on automation, enhanced data utilisation and streamlined workflows this transformation provides a unique opportunity to shape the More ❯

days on site Company: We are partnered with a client in the Home Counties undergoing a major Digital Transformation programme. This initiative will modernise their legacy systems and transform both their IT infrastructure and operational processes. With a strong emphasis on automation, enhanced data utilisation and streamlined workflows this transformation provides a unique opportunity to shape the More ❯

Greenfield project : No legacy systems or tech debt. Direct Impact : As you work on the mission-critical flagship product, your contribution will shape the company's future. Opportunity for growth: Join early and grow as the team expands. Unique start-up culture while being part of a well-established and reputable group. Embrace AI: We are strong More ❯

of penetration testing experience (infrastructure/internal focus) Strong hands-on expertise with Active Directory attacks, lateral movement, and privilege escalation Experience navigating live and legacy production systems Comfortable in Windows and Linux command-line environments Desirable: Python scripting or automation experience Familiarity with OT (Operational Technology) networks Experience with tools like CrackMapExec, BloodHound, PowerView, etc. Certifications More ❯

Strategic AEs already earning £1.5M+ annually. Greenfield opportunity - Own and expand into some of the world’s largest enterprises in EMEA. Category-defining tech - Replacing legacy procurement systems with a sleek, AI-first platform. Elite leadership - Proven SaaS operators, top-tier VC backing, and a strong sales playbook. The Role As a Strategic Enterprise Account Executive , you More ❯

Strategic AEs already earning £1.5M+ annually. Greenfield opportunity - Own and expand into some of the world’s largest enterprises in EMEA. Category-defining tech - Replacing legacy procurement systems with a sleek, AI-first platform. Elite leadership - Proven SaaS operators, top-tier VC backing, and a strong sales playbook. The Role As a Strategic Enterprise Account Executive , you More ❯

issues with various teams (Models Analytics, tech teams, ePricing etc) Check trade and cash data and make sure they are handled properly. Compare Risk and PV vs Existing legacy system. Host weekly working group with G10 traders Document all differences, gather sign offs KEY Relationships: FM users : Front Office, Market Risk, Finance, Middle Office, Operations Technology : Development leads More ❯

issues with various teams (Models Analytics, tech teams, ePricing etc) Check trade and cash data and make sure they are handled properly. Compare Risk and PV vs Existing legacy system. Host weekly working group with G10 traders Document all differences, gather sign offs KEY Relationships: FM users : Front Office, Market Risk, Finance, Middle Office, Operations Technology : Development leads More ❯