1 to 25 of 76 Legacy Systems Jobs in the City of London

join a high-impact digital transformation project within a secure government environment. This role focuses on the consolidation and migration of legacy systems into a new, centralised ERP platform . You’ll play a key role in mapping, transforming, and validating large datasets across multiple departments, ensuring … data integrity and compliance throughout the migration lifecycle. Key Responsibilities: Analyse and profile data across legacy systems to understand current data structures and quality Work closely with business users and technical teams to define and document data requirements Support data mapping, transformation, and cleansing processes to prepare … scale system migration projects ✅ Strong SQL skills and familiarity with Excel, Power BI or other data visualisation tools ✅ Experience working with legacy systems and integrating into modern ERP platforms (e.g., Oracle, SAP, Workday, Unit4, etc.) ✅ Knowledge of data governance and data quality best practices ✅ Excellent communication and More ❯

31.07.2025 col-wide Job Description: Our global client is looking for a D365 F&O specialist with extensive experience migrating from legacy systems to D365 F&O. This is a hybrid role outside IR35 initially for 9 months with a good chance to extend. The Data Migration … Lead will oversee the planning, execution, and management of data transfers from legacy systems to Microsoft Dynamics 365. Responsibilities include ensuring data accuracy, consistency, and compliance with business needs throughout the migration lifecycle. Required skills include a strong understanding of data migration principles and best practices, experience … O integrations using Azure services. Proven success in migrating Dynamics 365 F&O multiple times and leading data migration projects from legacy systems is essential. #J-18808-Ljbffr More ❯

About the Role: As Technical Lead you will play a central role in designing and delivering enterprise-grade solutions, managing both legacy systems and the strategic migration to Azure-based cloud platforms. You’ll lead by example, guiding a cross-functional team through complex technical decisions, ensuring … delivery standards, and alignment with the wider enterprise architecture. This role offers the opportunity to contribute to large-scale modernisation while maintaining essential business systems used across global markets. Key Responsibilities: Lead the technical design and decision-making for all team deliverables, ensuring architectural alignment and long-term maintainability. … technical delivery of features, with a focus on quality, scalability, and performance. Work closely with architects to contribute to the ongoing evolution of enterprise systems, balancing innovation with operational stability. Provide technical leadership, mentoring developers and fostering a high-performing Agile team culture. Collaborate with DevOps and platform engineering More ❯

We are seeking an experienced Project Manager to lead the end-to-end implementation of Microsoft Dynamics 365, overseeing the transition from a legacy platform to a modern, scalable CRM/ERP solution. This role is critical in enabling operational efficiency and enhancing user experience across the organisation. … project lifecycle of the D365 implementation, from initial planning through to delivery and post-go-live support. Manage the transition from legacy systems to Microsoft Dynamics 365 with minimal disruption to business operations. Define project scope, objectives, deliverables, and success metrics in collaboration with key stakeholders. Develop … or Finance & Operations implementations. Strong understanding of the D365 platform and common integration and data migration challenges. Experience managing transitions from legacy systems to Microsoft cloud solutions. Excellent stakeholder management and communication skills across technical and non-technical audiences. Experience working in Agile, Waterfall, or hybrid delivery 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 … 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 More ❯

Our global client is looking for a D365 F&O specialist with extensive expeirence migrating from legacy to D365 F&O. This is a hybrid role outside IR35 initially for 9 months … with a good chance to extend. Data Migration Lead tasked with overseeing the planning, execution, and management of data transfers from legacy systems to Microsoft Dynamics 365. Responsibilities include ensuring data accuracy, consistency, and compliance with business needs throughout the entire migration lifecycle." Strong understanding of data … O and integration using Azure services. Successfully migrated Dynamics 365 F&O multiple times, with proven experience leading data migration from legacy systems to D365. More ❯

twentyAI are partnering with a globally renowned law firm currently undergoing a major digital and data transformation. With a deep-rooted legacy in legal excellence and a strong global footprint, the firm is currently modernising their data capability and building a new data platform. About the Role You … security controls in pipelines. Identify bottlenecks and optimise performance across data pipelines and cloud infrastructure. Participate in the ongoing migration from legacy systems to modern data platforms. Your Background Experience with Microsoft Azure data tools — especially Data Factory and Synapse. Familiarity with Microsoft Fabric will be beneficial. … data engineering context. Practical knowledge of distributed processing frameworks, particularly Spark. Comfortable working in a complex environment that is evolving from legacy systems toward a modern data architecture. Strong problem-solving skills and the ability to work collaboratively in a cross-functional agile team. Exposure to data More ❯

relationship with one of the business’s most important outsourced IT service providers Managing contract performance, value delivery, and governance across legacy systems and service infrastructure Partnering with senior internal stakeholders in IT, procurement, and operations Supporting the transition to an integrated commercial and SRM (Supplier Relationship … with end-to-end category ownership experience Deep expertise in Tech Services procurement , particularly infrastructure, cloud, SaaS, data, and/or legacy systems Proven ability to manage high-value, complex outsourced service providers Strong supplier relationship and performance management capability Strategic sourcing experience with a pragmatic, delivery More ❯

Microsoft/Azure data tools. You'll play a key role in standardising and migrating data from a diverse range of legacy systems into a centralised Dynamics 365 CE environment. You’ll lead the full data migration lifecycle and work closely with technical and functional stakeholders to … execute ETL (Extract, Transform, Load) processes into Dynamics 365 CE modules (e.g., Sales, Customer Service, Field Service). Work with legacy CRM systems, spreadsheets, databases, and proprietary platforms to extract data. Map and transform data into Dynamics 365 CE entities such as Accounts, Contacts, Leads, Cases, and More ❯

including accounting, financial reporting, and budgeting, and how these map to D365. Experience supporting or leading ERP system migrations, particularly from legacy systems to D365. Skilled in gathering, analysing, and documenting business requirements, and translating them into functional specifications and system solutions. Excellent problem-solving abilities with … solutions. Assess and solve complex finance-related problems by applying industry best practices and technology solutions. Support the migration from legacy finance systems to a new platform, ensuring smooth transition and minimal disruption. Analyse and understand matured finance processes and adapt them to the new platform, leveraging More ❯

to improve new and existing database systems. Assess data implementation procedures to ensure they comply with internal and external regulations. Install and organize information systems to guarantee functionality. Prepare accurate database design and architecture reports for management and executive teams. Oversee the migration of data from legacy systems to new solutions. Educate staff members through training and individual support. Offer support by responding to system problems in a timely manner. Requirements: Strong knowledge of database structure systems and data mining. Knowledge of systems development, including system development life cycle, project management approaches More ❯

to improve new and existing database systems. Assess data implementation procedures to ensure they comply with internal and external regulations. Install and organize information systems to guarantee functionality. Prepare accurate database design and architecture reports for management and executive teams. Oversee the migration of data from legacy systems to new solutions. Educate staff members through training and individual support. Offer support by responding to system problems in a timely manner. Qualifications : Strong knowledge of database structure systems and data mining. Knowledge of systems development, including system development life cycle, project management approaches More ❯

assets. Our flagship product, the Ownera Router, powered by the open FinP2P protocol, enables seamless connectivity between institutions, blockchains, and legacy financial systems to unlock new opportunities in digital asset trading and tokenization. Job Overview As a Solutions Engineer , you will partner with the Sales, Product, and … Engineering, Finance, or a related field. Strong understanding of blockchain technology, digital assets, and tokenization. Experience with financial infrastructure, APIs, and legacy systems integration. Beneficial to have experience with scripting (Python, Bash), knowledge of Kubernetes/Docker, or experience working with financial data platforms. Sales & Business Development More ❯

to improve new and existing database systems. Assess data implementation procedures to ensure they comply with internal and external regulations. Install and organize information systems to guarantee functionality. Prepare accurate database design and architecture reports for management and executive teams. Oversee the migration of data from legacy systems to new solutions. Educate staff members through training and individual support. Offer support by responding to system problems in a timely manner. Requirements: Strong knowledge of database structure systems and data mining. Knowledge of systems development, including system development life cycle, project management approaches More ❯

to improve new and existing database systems. Assess data implementation procedures to ensure they comply with internal and external regulations. Install and organize information systems to guarantee functionality. Prepare accurate database design and architecture reports for management and executive teams. Oversee the migration of data from legacy systems to new solutions. Educate staff members through training and individual support. Offer support by responding to system problems in a timely manner. Requirements: Strong knowledge of database structure systems and data mining. Knowledge of systems development, including system development life cycle, project management approaches More ❯

to improve new and existing database systems. Assess data implementation procedures to ensure they comply with internal and external regulations. Install and organize information systems to guarantee functionality. Prepare accurate database design and architecture reports for management and executive teams. Oversee the migration of data from legacy systems to new solutions. Educate staff members through training and individual support. Offer support by responding to system problems in a timely manner. Requirements: Strong knowledge of database structure systems and data mining. Knowledge of systems development, including system development life cycle, project management approaches More ❯

and maintaining RESTful APIs Solid understanding of HTTP protocols, status codes, headers, etc. API documentation using tools like Swagger/OpenAPI Legacy Systems Exposure to or experience with WCF services — we still support some older systems, so comfort working with a mix of modern and legacy More ❯

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 More ❯

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 More ❯

wealth platform using Avaloq for a leading Wealth Management firm. This strategic transformation programme aims to modernise and streamline front-to-back operations, consolidate systems, and enhance digital capabilities across the client lifecycle. As part of this large-scale implementation, a dedicated Data Migration Lead is required to own … essential). Strong knowledge of data migration methodologies including data mapping, extraction, cleansing, transformation, reconciliation, and cutover planning. Experience working with legacy systems and managing complex data landscapes including customer, account, transaction, product, and portfolio data. Understanding of the regulatory and operational implications of data handling in … related to data migration. Experience managing third-party vendors and coordinating across multi-functional project teams. Skills Data analysis, profiling, and mapping across multiple systems End-to-end data migration planning and execution Defect management, reconciliation, and exception handling Strong documentation and communication skills for both technical and non More ❯

analyse their current and future business needs, recommend best practice solutions, and define project deliverables Translate accounting requirements into system configurations Configure debt accounting systems (i.e. Allvue, Broadridge Sentry) to track complex instruments Design customised workflows aligned with investment strategies and processes Migrate data from legacy systems … track actions, and manage progress meetings Create and deliver training materials and documentation Provide ongoing system optimisation and support Qualifications and Skills: Private Credit Systems Implementation Experience (Highly Desired): Minimum 2-3 years of experience implementing private credit Investment Accounting software is highly valued. Ideal candidates would have exposure … book transactions such as drawdowns, repayments, PIK interest, and fee amortisation is essential. Experience reconciling positions and cash flows across administrators, custodians, and internal systems is also highly valued. System Knowledge: Proficiency with industry-standard platforms utilised in private credit investment operations and accounting. Strong expertise with Allvue investment More ❯

Provide training and support to end-users to ensure efficient use of the platform. Assist in migrating data and transitioning from legacy systems to Endur. Collaborate with project managers and IT teams to deliver projects on time and within budget. Stay updated with the latest updates and More ❯

you’ll own the definition and implementation of enterprise-wide security architecture. You’ll be responsible for designing strategies and frameworks that secure critical systems and services, spanning both on-premise and cloud environments. You’ll also play a hands-on leadership role in mentoring solution and technical architects … security-focused architecture patterns Design and maintain conceptual and logical security architectures across multiple technology domains Support secure delivery of cloud and on-premise systems (Oracle, Microsoft, Salesforce, MuleSoft) Guide solution and technical architects on security principles, best practices, and assurance Contribute to architecture governance, standards, and documentation Partner … in complex environments Strong understanding of enterprise security frameworks, governance, and risk management Experience delivering secure architectures in cloud, hybrid, and legacy systems Hands-on knowledge of modelling tools and frameworks (UML, ArchiMate, Bizz design ideal) Broad technical knowledge across infrastructure, data, CRM, HR, and finance systems More ❯

Description: We’re working with a major financial institution looking to scale out its engineering function with a Principal Java Developer to lead critical systems work. This is a hands-on role within a high-performing team modernising legacy platforms, improving availability, and delivering new functionality across … CD improvements, REST API design, and steering collaborative technical decisions across squads. What they’re looking for: Proven experience supporting large-scale, business-critical systems Strong background in Java and ideally C# Some front end exposure (Angular ideally but other frameworks considered). Note the role is back end … focused. Comfortable working with legacy systems and large enterprise environments Confident leading technical conversations across multiple engineering disciplines Experience with CI/CD pipelines and modern deployment practices Greenfield REST API design including HATEOAS implementation Angular, React or frontend exposure Familiarity with Snowflake or backend SQL variants More ❯

the company’s hydrogen production and sales operations. This role is instrumental in advancing the digital transformation agenda by integrating isolated legacy systems, deploying new digital tools, and ensuring full compliance with evolving regulatory frameworks. The ideal candidate will combine technical acumen with excellent programme management skills … Sound financial and budgeting capabilities Effective multitasking and problem-solving abilities under pressure Proficiency in project management tools (e.g. Microsoft Project) Experience integrating diverse systems and technologies Knowledge of Python is a plus Familiarity with UK low-carbon certification schemes (LCHS, RTFC) is advantageous #J-18808-Ljbffr More ❯