1 to 25 of 86 Legacy Systems Jobs in London

engineering performance across delivery, quality and technical standards, while helping shape the next phase of platform evolution. This includes modernising legacy systems, driving adoption of modern technologies and embedding AI-led efficiencies into both internal engineering workflows and customer-facing products. The Role Reporting directly … high-performing engineering function across multiple disciplines Own engineering delivery, release quality and technical execution Drive platform modernisation and migration from legacy systems to modern architectures Build scalable, modular, service-oriented systems and technical standards Oversee DevOps, infrastructure reliability, monitoring and release processes Foster strong collaboration ...

scale financial data platform. You'll be working with the technology team, supporting a core platform modernisation initiative. Our environment combines long-established enterprise systems and legacy components with modern cloud-based services running on AWS. The platform processes high-volume structured financial data and underpins both … internal systems and customer-facing products. A substantial portion of the platform is built on large SQL Server data estates, making strong SQL expertise non-negotiable. You will play a key role in modernising core systems, improving performance and reliability, and delivering scalable services for the next generation ...

live trading. This is not a greenfield role. Success comes from adding value immediately within a large, demanding codebase — understanding existing Java and .NET systems well enough to reason about trade-offs, guide refactoring or selective rewrites, and make sound architectural decisions under pressure. The roadmap you produce … themselves. A strong candidate will actively embrace agentic AI tooling as a force multiplier — not just to accelerate development, but to rapidly comprehend unfamiliar systems, trace behaviour across services, uncover hidden dependencies, and validate architectural thinking. Combined with deep equities domain knowledge and experience building large-scale distributed systems ...

data workstream. Requirement for someone to lead the full data agenda across the programme lifecycle working across legacy systems, Workday, integrations and reporting requirements. Workday Data Lead, key responsibilities: Lead data workstream across full programme lifecycle Define and deliver data strategy - data plan for Workday Financials implementation … Understanding of finance data structures including master data Experience defining and managing data strategies and data plans Previously worked across multiple legacy systems and data sources Overseeing and coordinating technical teams Strong understanding of data quality and data controls Reasonable Adjustments: Respect and equality are core values ...

IR35 £700–£750 per day The Role You will support the evolution of a large-scale financial data platform, modernising legacy enterprise systems while building scalable cloud-based services on AWS. Own SQL Server optimisation, backend service design, and API development in a high-impact platform modernisation … performance tuning, indexing, complex queries) – non-negotiable Backend development in Python or C# AWS environment experience Proven experience in enterprise or legacy systems – critical Strong analytical and problem-solving abilities We'd expect you to have around 10 years of software and data engineering skills. Nice ...

leading the resolution of structural platform issues. Leveraging strong integration expertise, you will design and manage complex data mappings across legacy systems, middleware, and modern platforms, while maintaining clear, high‐quality architecture documentation to support long‐term operational ownership. Responsibilities Architecture Blueprint Delivery Produce high‐quality High … Level Designs (HLDs) and Low‐Level Designs (LLDs) across core platforms including Digital Transaction Systems (DTS), EPOS, and other strategic programmes. Designs must be detailed, unambiguous, and set the contractual delivery standard for external vendors. Vendor Governance & Quality Assurance Perform structured reviews and audits of vendor‐delivered architecture ...

Title: Senior Systems Engineer (eDV Clearance required) Location: Hybrid In London Employment Type: Permanent Salary: Up to £98,000 + package Start Date: Immediate Industry: IT Services & Consulting We’re supporting a specialist consultancy delivering cutting-edge programmes across the UK Defence and National Security space. They’re looking … Senior Systems Engineer to lead the delivery of complex, mission-critical systems across secure environments. This is a high-impact role where you’ll bridge strategy and engineering - shaping solutions that integrate cloud, data, and AI technologies into secure, safety-critical systems. Senior Systems Engineer – Key Responsibilities ...

Senior Systems Integration Consultant (.NET, Azure, Data, MIS) Job Description Contract Length: 3 months Start: Immediate Day Rate: £400-£500 per day IR35: Outside IR35 Location: Hybrid, predominantly remote Overview We are looking for a senior Systems Integration Consultant to step into a live environment and stabilise … ensure the platform is fully operational. Key Responsibilities Stabilise and optimise Mitratech platform integration Extract and migrate data from legacy .NET systems Build and troubleshootintegrations across: Timesheet systems HR workflows including Excel exports Internal operational systems Implement workflow automation and triggers Debug live production issues ...

advanced data pipelines with Python, SQL, Spark/PySpark and Delta Lake. Champion strong data quality, governance and observability practices. Modernise legacy systems and support large-scale migrations into Azure. Provide technical leadership, set engineering standards and contribute to architectural decisions. Mentor engineers and foster a culture ...

extend About the Role We’re partnering with a financial client that’s undertaking a large-scale data transformation, modernising legacy systems and building a unified analytics platform in the cloud. As part of this initiative, you’ll play a key role in developing and optimising … data models, ensuring performance, accuracy and user accessibility. Contribute to the migration of legacy SQL Server (SSIS/SSAS/SSRS) systems into a modern Snowflake/Power BI environment. Work collaboratively with business users to understand requirements, translate them into technical solutions and deliver robust, scalable ...

volumes of trading data and directly impacts trading performance and decision-making. You will lead a backend engineering squad working on low-latency C++ systems, while helping to modernise a complex legacy platform. A key focus will be improving release cadence and delivery maturity, alongside driving architectural … where needed, contributing to C++ and Python code in production What you will need Strong C++ experience within low-latency or real-time systems Exposure to Python (or willingness to work with it) Experience working on complex, business-critical platforms (ideally within trading or financial systems) Proven ability ...

Design: Help define the enterprise data architecture vision, standards, and roadmap. Aid in the design the initial data platform to support integration with core systems and future enterprise-scale data needs. Evaluate, recommend, and drive the adoption of modern data technologies, tools, and patterns (e.g., data lakehouse, ETL/… communication and stakeholder engagement skills, with the ability to influence at senior levels. Comfortable driving a data agenda in environments with legacy systems, evolving requirements, and strong regulatory constraints. Desirable Skills: Experience working with finance systems and associated data structures. Familiarity with cloud platforms (Azure ...

individuals as all work will require extensive collaboration with engineers and stakeholders across many teams. Key Responsibilities: Collaborate with engineers of legacy systems to understand what data is available and the form it takes Design queries & scripts to extract and transform data from … based workflows, code reviews, and CI/CD practices. Preferred Qualifications: Have used Azure cloud services previously Experience with streaming/event-driven systems e.g., Kafka/Kinesis Experience with infrastructure as code e.g., Terraform and containerization e.g., Docker/Kubernetes Familiarity with data governance, cataloging, lineage, and privacy ...

individuals as all work will require extensive collaboration with engineers and stakeholders across many teams. Key Responsibilities: Collaborate with engineers of legacy systems to understand what data is available and the form it takes Design queries & scripts to extract and transform data from … based workflows, code reviews, and CI/CD practices. Preferred Qualifications: Have used Azure cloud services previously Experience with streaming/event-driven systems e.g., Kafka/Kinesis Experience with infrastructure as code e.g., Terraform and containerization e.g., Docker/Kubernetes Familiarity with data governance, cataloging, lineage, and privacy ...

Deployed Engineer (Sr. FDE) to design, build, and deploy cutting-edge AI-powered solutions within enterprise environments. This role requires deep expertise in distributed systems, cloud platforms, and applied AI, with a strong focus on delivering scalable, production-grade agentic applications. Technical Skills & Requirements : Core Engineering: Languages: Expert-level … proficiency in TypeScript/Node.js and Python. (Experience with Go or Rust is a plus). Systems Design: Strong background in distributed systems, event-driven architectures, and stateful application design. Cloud Infrastructure: Deep expertise in Azure (Azure AI Foundry, App Services, Container Apps, VNet peering) and/ ...

ontology capabilities. Experience in multi-cloud and data migration environments: Experience working with data environments in Microsoft Asure, AWS, and legacy systems, and a proven ability to consolidate and migrate data processes and workloads into Palantir Foundry as part of a broader data strategy. Data-driven business ...

What You'll Be Doing Define and own the platform architecture strategy across multiple teams and regions Drive the transition from legacy systems to cloud-native architecture Ensure systems are scalable, resilient, and built for long-term growth Partner closely with engineers to embed modern development … platform is built and evolves Technology Environment Backend: TypeScript (Node.js) Frontend: JavaScript/React Cloud: AWS (containers, serverless, wider ecosystem) Architecture: Distributed systems, microservices, cloud-native design What They're Looking For Proven experience as a Platform/Solution Architect in modern cloud environments Strong background building scalable, distributed ...

legacy business systems. The role oversees service operations spanning the full Hire to Retire (H2R) business process lifecycle, ensuring all supporting systems, integrations, and workflows operate effectively and consistently. The ideal candidate is a proactive leader with expertise in ITIL, Service Management, and service optimisation across complex … Delivery Oversee end‐to‐end service delivery for Oracle EBS/Fusion and manage operations & support for third‐party applications and legacy systems that integrate into or complement Oracle EBS/Fusion. Ensure seamless support of Hire‐to‐Retire (H2R) processes across all systems, including onboarding ...

documentation Role Responsibilities Design and deliver scalable, cloud-based data engineering solutions Lead efforts to modernize data platforms, including migration of legacy systems to cloud infrastructure Manage data ingestion, integration, and transformation workflows while ensuring high standards of data quality, governance, and performance Collaborate with ...

-to-cloud transformation initiatives. Key requirements: Proven experience as a Senior Business Analyst Active SC (Security Clearance) Experience in migrating legacy systems to AWS Strong expertise in requirements gathering, documentation, and end to end process analysis. Hands-on experience working within mature IT Service Management (ITSM ...

post-trade processing across multiple Securities Finance transaction types. This is a high-impact delivery role within a critical programme replacing legacy systems, where the successful candidate will be expected to contribute quickly and operate with minimal hand-holding. Responsibilities: Contribute to the design and build … core software engineering principles. Proven architecture and system design capability, including ability to decompose problems and articulate design rationale. Experience building and supporting production systems in a high-pressure delivery environment. Working knowledge of SQL/relational databases. Experience working in Agile environments, including exposure to automated testing ...

Title: Engineering Lead (C++) - Low Latency/Trading Systems Location: London (Hybrid) Overview Our client is a global fintech operating at scale across trading, risk, and market connectivity. They are hiring an Engineering Lead (C++) to take ownership of a business-critical platform sitting at the heart of real … Define and deliver a clear technical and product vision Improve release processes, reducing downtime and increasing deployment frequency Drive modernisation across legacy systems, infrastructure, and tooling Collaborate closely with trading, quant, and risk stakeholders Remain hands-on, contributing to production-grade C++ code What They're Looking ...

products. With a strong reputation for solving complex technical challenges, they work with leading organisations to deliver AI-enabled solutions, modernise legacy systems, and build high-performance applications. Their teams are distributed globally and operate in a highly collaborative, engineering-led environment. The Role As a Technical ...

containers, serverless, broader ecosystem) What They're Looking For Strong platform/solution architecture experience in modern cloud environments Background building scalable, distributed systems Ability to operate at a senior stakeholder level Strong communication and influencing skills A modern engineering mindset (not tied to legacy approaches … This Role Shape a next-generation platform, not maintain legacy systems High visibility with direct impact on business growth and platform direction Environment investing heavily in modern engineering and cloud If you think you have the necessary skills and experience then please apply now! McGregor Boyall ...

most ambitious financial services programmes. They work closely with business and technology leaders to drive strategic change, from platform modernisation and core systems reengineering, to cloud adoption and integration overhaul. Your Role You’ll be part of a highly credible, expert-led team shaping complex solutions across the full … technology stack. Whether modernising legacy systems, enabling cloud-first strategies, or improving end-to-end integration, you’ll bring structure, clarity, and delivery alignment to everything you do. What You’ll Be Doing as a Solution Architect: Lead the design and implementation of end-to-end solutions ...