19 of 19 Contract Legacy Systems Jobs in London

C#) architecture and we're looking for an experienced Oracle Developer to play a key role in this journey. You'll work at the intersection of legacy systems and new architecture, translating complex logic into scalable, maintainable C# code. What You'll Be Working On: Rewriting complex PL/SQL logic into performant, readable C# code. Decoupling … types into .NET equivalents, ensuring performance and integrity. Collaborating on the migration from Oracle to Postgres or MySQL. Supporting a hybrid environment during rollout, where legacy Oracle systems and new .NET components coexist. Utilising AI-assisted tools for code analysis, documentation, and transformation. What We're Looking For: Oracle PL/SQL experience, including deep expertise in … in database migration from Oracle to Postgres or MySQL. Excellent analytical and problem-solving skills, with strong attention to detail. Clear communication skills with the ability to explain complex systems and document processes. Desirable Experience: Experience working with PHP systems that integrate with Oracle databases. Familiarity with AI-assisted development tools. Background in data modelling, version control of More ❯

the existing team to re-engineer Oracle PL/SQL stored procedures into C# services. Design and implement .NET-based components that integrate with both legacy PHP systems and new PostgreSQL databases. Work closely with business analysts and stakeholders to ensure functional parity and identify opportunities for enhancement. Participate in the design of a hybrid architecture that … Skills & Experience 5+ years of experience in .NET/C# development, with a strong focus on backend services and data access layers. Proven experience in migrating legacy systems, especially from Oracle to PostgreSQL or similar. Strong understanding of PL/SQL and experience translating stored procedures into application logic. Familiarity with PostgreSQL, including performance tuning and SQL … dialect differences. Experience working in hybrid environments where legacy and modern systems coexist. Comfortable using AI tools (e.g., GitHub Copilot, ChatGPT, code translators) to assist in development and migration tasks. Solid understanding of software architecture, design patterns, and integration strategies. Excellent communication skills and ability to work collaboratively in a cross-functional team. Desirable Skills Experience with More ❯

Senior .NET/C# Developer Oracle to PostgreSQL Migration: Our client is embarking on a strategic transformation of a legacy enterprise platform, rebuilding a … long-standing PHP and Oracle-based system into a .NET (C#) and PostgreSQL architecture. Seeking talented developers who are excited to work at the intersection of legacy systems, modern architecture and cutting-edge development tooling. Your Responsibilities: Re-engineer Oracle PL/SQL logic into performant and maintainable C# services. Design and build .NET components that interact … strategies and support comprehensive documentation efforts. What You'll Bring: Experience developing in .NET/C#, particularly in backend and data access layers. Proven success migrating legacy systems, especially from Oracle to PostgreSQL or similar. Strong working knowledge of Oracle PL/SQL and the ability to translate procedural logic into C#. Solid experience with PostgreSQL, including More ❯

markets. Think of yourself as the digital architect transforming complex business requirements into elegant technical solutions! YOUR MISSIONBE THE POWER PLATFORM GURU: Develop sophisticated Power Apps applications for internal systems and business automation Work with stakeholders to capture and translate complex requirements into technical solutions Create seamless integrations with Microsoft ecosystem components BUILD TECHNICAL EXCELLENCE: Establish development standards that … Strong Power Platform development experience with comprehensive knowledge of the ecosystem C# .NET and JavaScript expertise for custom development and integrations HCL Notes/Lotus Notes experience - additional legacy system capabilities Canvas and Model-driven Power Apps knowledge - full low-code understanding would be ideal Database experience with proven track record in SQL Server and Oracle environments Stakeholder … offices Cutting-Edge Technology - Latest Microsoft Power Platform innovations Technical Impact - Drive digital transformation in a prestigious financial services environment Technical Variety - From modern low-code solutions to legacy system support BROADER SCOPE Design database structures and partner with SQL/Oracle database specialists Resolve technical issues and deploy fixes across Windows Server environments Collaborate with Technical Support More ❯

Analyst embedded in a local authority's Transformation Team, working across Adult Social Care and Housing. You'll cleanse and restructure complex datasets, match records across legacy systems, and build clear, actionable reports in Power BI. Backed by a wider team of analysts and project staff, you'll play a key role in driving data-led service … teams and leadership make smarter, faster decisions. Essential (Must have): Demonstrable experience in local government or public services Strong knowledge of Adult Social care and/or Housing data systems (e.g. Mosaic, Eclipse, NEC, Jigsaw) Expertise in cleansing, validating, matching, analysing and visualising large, complex data sets Proficiency with Power BI and SQL Experience drawing actionable insights from data More ❯

the organisation. THE ROLE As a Data Engineer, you'll play a pivotal role in designing and implementing robust data pipelines, supporting the migration from legacy Azure systems to Databricks, and working closely with stakeholders to deliver tailored data solutions. This role combines hands-on development with collaborative architecture design, and offers the opportunity to contribute to 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 ❯

user journeys and workflows, ensuring integration of compliance checks. Collaborate with IT on data integration and system requirements. Support UAT, write test scripts, and assist in transitioning from legacy systems. Participate in Agile ceremonies and manage deliverables using JIRA. Key Skills & Experience: Must-have: 8+ years in the Lloyd's/London Market. Business analysis: Requirements gathering, process More ❯

maintain a CSDM-compliant data strategy. You'll support the client through the go live and business adoption stage. Key Responsibilities: Be apart of the delivery of a legacy system upgrade and supporting clients through the go live stage and business adoption. Develop and implement a Common Service Data Model (CSDM)-compliant data strategy. Define and execute technology More ❯

maintain a CSDM-compliant data strategy. You'll support the client through the go live and business adoption stage. Key Responsibilities: Be apart of the delivery of a legacy system upgrade and supporting clients through the go live stage and business adoption. Develop and implement a Common Service Data Model (CSDM)-compliant data strategy. Define and execute technology More ❯

Our client, an established entity in the technology sector, is seeking a qualified Systems Accountant for a contract position, the office is based in Richmond or can be fully remote. This vital role supports a key finance transformation project, involving system migration work and ensuring data integrity. Key Responsibilities: Support the migration of financial data from a legacy system into NetSuite Reconcile opening balances and investigate discrepancies Clean, validate, and restructure historical financial data Map and align chart of accounts between old and new systems Collaborate with finance, IT, and project teams to ensure a smooth transition Provide post-migration support, including reconciliations and integrity checks Assist in process improvements and documentation during the transformation … Job Requirements: Qualified accountant (ACA, ACCA, CIMA or equivalent) Strong technical accounting knowledge and attention to detail Proven experience in system migrations, particularly finance systems Proficiency with NetSuite is essential Knowledge of Opera accounting software is a strong bonus Advanced Excel skills (lookups, pivot tables, data cleansing) Excellent communication and problem-solving abilities Behavioural Competencies: We Work Hard Accuracy More ❯

months Start Date: ASAP Overview Our client is seeking an experienced Inventory Migration Specialist to support a high-impact project focused on migrating legacy fibre network inventory systems to a modern, commercial off-the-shelf platform. The ideal candidate will possess strong domain knowledge of both active and passive fibre networks, along with practical experience in data … This is a hands-on role requiring both technical expertise and a deep understanding of network inventory environments. Key Responsibilities: Conduct in-depth analysis of legacy inventory systems (primarily home-grown) and support the phased migration. Identify data quality issues, inconsistencies, and recommend resolution strategies. Work closely with SMEs, data owners, and legacy system specialists … and delivery of fixed project milestones within a collaborative transformation team. Required Skills & Experience: Solid experience with both active and passive fibre network assets. Prior exposure to inventory management systems — experience with Comarch is highly desirable. Strong analytical background with the ability to work with SQL and data querying tools (e.g.Toad). Familiarity with data mapping in complex network 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 ❯

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 ❯

strategy and roadmap for the internal data platform during a key transitional phase Provide high-level product consultancy to support the ongoing unification of multiple legacy data systems into a single platform Act as product owner/consultant across stakeholders, aligning platform capabilities with business and editorial needs Translate complex technical requirements into clear product direction Ensure More ❯

configuration assessment Proven expertise in backup technologies, recovery processes, and gap analysis Solid understanding of operational resilience and Minimum Viable Company (MVC) planning Experience working across Legacy systems and modern cloud platforms such as Azure and Microsoft 365 This is an initial 6-month contract with strong potential for extension. The role is based in Basingstoke, with More ❯

Lead Technical Architect - UK Government - 12 Months Contract Initially you would be leading a small discover team on exploring how to incrementally replace the client's legacy systems with digital services which meet the Government Service Standard. In this role, the Consultant will help setting the strategy for the next few years, and the main responsibilities will More ❯

Lead Technical Architect - UK Government - 12 Months Contract Initially you would be leading a small discover team on exploring how to incrementally replace the client's legacy systems with digital services which meet the Government Service Standard. In this role, the Consultant will help setting the strategy for the next few years, and the main responsibilities will More ❯

SC clearance and willing to obtain DV clearance are preferred. You will manage the technical strategy and design for an enterprise-wide replacement of their legacy communication systems such as Mitel, video conferencing, and room booking tools with a single, integrated UCC platform. In addition, you'll shape how these systems are brought together, ensuring they More ❯