1 to 25 of 150 Permanent Legacy Systems Jobs in London

IT Systems Engineer 12 Months FTC offering £46,000 per annum + great benefits £8,000 Travel Assistance (HCAS) Generous pension (12% Personal Contribution + 23% Employer Contribution) Up to 35 days per year About the role This is an exciting opportunity to play a key role in the … skills and make positive impact? We are looking for an experienced IT professional to join during the transition of legacy case management systems to modern, cloud-based solutions. Your role will focus on maintaining and supporting on prem legacy systems during ongoing transformation to … cloud-based (AWS) software as a service (SaaS). Your role would be in 60% focussing on supporting Applications/systems that sit on SQL, and 40% would be general Infrastructure support. Therefore we are looking for all-arounder, with good SQL knowledge. What You Will Do Provide expert More ❯

Bachelor's degree in computer science, Engineering, related field, or equivalent experience. Substantial hands-on technical experience with mainframe, non-x86 legacy systems and with technologies such as COBOL, JCL, CICS, DB2 for z/OS, Assembler, PL/I, Java, Rexx, flat/sequential files, GDGs … and VSAM. Proven track record in a technical lead role migrating workloads from mainframe and non-x86 legacy systems to distributed x86 infrastructures either on-premises or on to the Cloud. Deep experience integrating mainframe and non-x86 legacy systems with distributed Linux-based … audiences AWS associate or professional level certifications (e.g., Solutions Architect Associate or Professional, DevOps Engineer Professional) preferred Experience leading customers with mainframe and legacy modernization initiatives. Experience with tools and methodologies used to migrate mainframe workloads via hardware/middleware emulation, automated code conversion, and re-platforming. Experience More ❯

Bachelor's degree in computer science, Engineering, related field, or equivalent experience. Substantial hands-on technical experience with mainframe, non-x86 legacy systems and with technologies such as COBOL, JCL, CICS, DB2 for z/OS, Assembler, PL/I, Java, Rexx, flat/sequential files, GDGs … and VSAM. Proven track record in a technical lead role migrating workloads from mainframe and non-x86 legacy systems to distributed x86 infrastructures either on-premises or on to the Cloud. Deep experience integrating mainframe and non-x86 legacy systems with distributed Linux-based … audiences. AWS associate or professional level certifications (e.g., Solutions Architect Associate or Professional, DevOps Engineer Professional) preferred. Experience leading customers with mainframe and legacy modernization initiatives. Experience with tools and methodologies used to migrate mainframe workloads via hardware/middleware emulation, automated code conversion, and re-platforming. Experience More ❯

skills and make positive impact? We are looking for an experienced IT professional to join during the transition of legacy case management systems to modern, cloud-based solutions. Your role will focus on maintaining and supporting on prem legacy systems during ongoing transformation to … cloud-based (AWS) software as a service (SaaS). Your role would be in 60% focussing on supporting Applications/systems that sit on SQL, and 40% would be general Infrastructure support. Therefore we are looking for all-arounder, with good SQL knowledge. What You Will Do Provide expert … support and maintenance for legacy case management systems (Extranet, CMS, DTS, EKS2, and ADMS) in collaboration with the IT teams. Ensure the legacy systems continue to run smoothly during the transition to cloud-based solutions. Collaborate with cross-functional teams to ensure effective service More ❯

skills and make positive impact? We are looking for an experienced IT professional to join during the transition of legacy case management systems to modern, cloud-based solutions. Your role will focus on maintaining and supporting on prem legacy systems during ongoing transformation to … cloud-based (AWS) software as a service (SaaS). Your role would be in 60% focussing on supporting Applications/systems that sit on SQL, and 40% would be general Infrastructure support. Therefore we are looking for all-arounder, with good SQL knowledge. What You Will Do Provide expert … support and maintenance for legacy case management systems (Extranet, CMS, DTS, EKS2, and ADMS) in collaboration with the IT teams. Ensure the legacy systems continue to run smoothly during the transition to cloud-based solutions. Collaborate with cross-functional teams to ensure effective service 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 ❯

development lifecycle, from design and development to deployment and support, ensuring seamless migration while maintaining high performance and scalability. Key Responsibilities: Evaluate existing architectural systems and propose an architecture roadmap to improve performance, scalability, and migration to the cloud. Lead a team of engineers in migrating monolithic Java applications … to AWS Kubernetes. Design and implement scalable, secure cloud infrastructure solutions. Develop and maintain a phased migration plan to transition legacy systems without impacting ongoing operations. Refactor and modernize legacy systems while ensuring minimal downtime and operational continuity. Optimize applications for maximum speed and … training and support to other team members on cloud technologies and best practices. Stay updated with emerging technologies and propose adaptations to keep our systems at the forefront of innovation. Analyze production incidents to find the most efficient way to address current architecture issues. Required Skills and Qualifications: 7+ More ❯

We are seeking a skilled and detail-oriented Finance Analyst - Data Migration to support the successful migration of financial data from legacy systems to Microsoft Dynamics as part of a wider systems implementation project. This role will be critical in ensuring data integrity, minimizing business disruption … collaboratively in a fast-paced, dynamic environment. What will I be doing? Supporting the end-to-end data migration process from legacy systems to the new platform. Extracting, cleansing, validating, and loading large volumes of data accurately and efficiently. Developing and executing data migration plans, schedules, and More ❯

team. You will get a lot of independence and responsibility right away, and you'll learn at an unprecedented speed! No legacy systems, no corporate bureaucracy, no multiple levels of approvals. It is up to you to make an impact. You will act like an owner and … environment - you will work very closely with the CEO, CTO, Head of Trading and the rest of the management team. No legacy systems and bureaucracy; access to high performance low latency infrastructure. A cool office in central London with a sci-fi touch. Aligned incentive structure: a More ❯

impact, efficient use of resource, and alignment to business structures Drive the design and development of system architecture, work with end-users of the systems, and enhance the quality of deliverables Ensure staff follows Citi documented policy and procedures as well as maintain desktop procedures and supporting documentation for … seen as the engineering role model for the organization Ability to work directly with trading and quant teams Proven track record of building new systems, replacing legacy systems and renovating existing systems The candidate will have a strong systems (software, hardware, networks) knowledge required 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 ❯

and integration points for continuity and future development. * Engage stakeholders to understand needs, usage and modernisation opportunities. * Design and propose a replacement using central systems and Microsoft Power Platform/Azure. * Lead redevelopment, delivering scalable, centrally supported tools. * Ensure compliance with governance, security and engineering best practices. * Coordinate integration … self-directed. A strong collaborator able to engage technical and non-technical audiences. Comfortable in a transitional environment where legacy and modern systems coexist. About the client. IT Services is a strategic, delivery-focused department supporting key professional operations. Committed to modernising the digital estate, they deliver … scalable services aligned with software development and security best practice. This role is key in replacing departmental legacy systems with centrally supported platforms, offering high autonomy, technical challenge and visibility across the institution. To apply, send your CV to Ryan at with a supporting statement outlining your More ❯

the go-to engineer for: End-to-end data migration architecture ( on-premise to cloud or cloud-to-cloud). Designing scalable and secure systems using AWS services like S3, Lambda, and EKS, EC2, VPC, RDS. Interfacing with both legacy PHP/C# systems and modern … to drive meaningful improvements in animal health. A bit more about the role, you will: Lead migration of data assets from legacy systems to our cloud-native environments using AWS and our bespoke Conversion Framework. Build new and maintain existing bespoke systems. Implement .NET-based microservices with … Coach junior developers and collaborate cross-functionally with product and platform teams. So what are we looking for? Bachelor's in Computer Science , Information Systems, or equivalent experience. 7+ years in software or data engineering, with strong recent experience in cloud data migrations. Proficient with MySQL, OOP, AWS (EC2 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 ❯

and integration points for continuity and future development. • Engage stakeholders to understand needs, usage and modernisation opportunities. • Design and propose a replacement using central systems and Microsoft Power Platform/Azure. • Lead redevelopment, delivering scalable, centrally supported tools. • Ensure compliance with governance, security and engineering best practices. • Coordinate integration … self-directed. A strong collaborator able to engage technical and non-technical audiences. Comfortable in a transitional environment where legacy and modern systems coexist. About the client. IT Services is a strategic, delivery-focused department supporting key professional operations. Committed to modernising the digital estate, they deliver … scalable services aligned with software development and security best practice. This role is key in replacing departmental legacy systems with centrally supported platforms, offering high autonomy, technical challenge and visibility across the institution. To apply, send your CV to Ryan at rmitchell@itecopeople.co.uk with a supporting statement More ❯

The Go-to Engineer For End-to-end data migration architecture ( on-premise to cloud or cloud-to-cloud). Designing scalable and secure systems using AWS services like S3, Lambda, and EKS, EC2, VPC, RDS. Interfacing with both legacy PHP/C# systems and modern … to drive meaningful improvements in animal health. A Bit More About The Role, You Will Lead migration of data assets from legacy systems to our cloud-native environments using AWS and our bespoke Conversion Framework. Build new and maintain existing bespoke systems. Implement .NET-based microservices with … Coach junior developers and collaborate cross-functionally with product and platform teams. So what are we looking for? Bachelor's in Computer Science , Information Systems, or equivalent experience. 7+ years in software or data engineering, with strong recent experience in cloud data migrations. Proficient with MySQL, OOP, AWS (EC2 More ❯

Technology for Group and Operations The Enterprise Solution Architect for Technology plays a critical role in shaping Aztec Group's technology landscape, ensuring that systems, integrations, and data architectures align with business objectives and market needs. Reporting to the Director for Group and Operations, you will define and govern … key advisor to senior stakeholders, the Enterprise Solution Architect will bridge business needs with technology capabilities, contributing to the transformation of legacy systems and integrating cutting-edge solutions to optimize operational workflows and processes. Key responsibilities: Enterprise Architecture & Strategy Define and maintain the technology architecture for Technology … for process improvements and drive initiatives to enhance the overall technology landscape. Qualifications & Experience Bachelor's or master's degree in computer science, Information Systems, or related field. Enterprise Solution Architecture Expertise: 10 years + experience as a Enterprise/Senior Solution Architect within a global/national organisation More ❯

and Mauritius. We operate as in line with our values: We challenge the norm, we change the way we think and work, by connecting systems and people, while committing to our vision and each other. We are now looking to recruit a skilledTeam Lead to join our global development … cornerstone of our backend development efforts. This is not just another development role; we're seeking someone with the acumen to build frameworks and systems from scratch, championing .NET core and fostering a culture of Test-Driven Development (TDD) within the team. Your technical expertise will be pivotal in … highest standards of development practice. Responsibilities: Drive technical standards and champion best practices within the backend team. Lead the design and architecture of backend systems, ensuring scalability, reliability, and optimal performance. Collaborate with other tech leads, product owners, and stakeholders to align the technical roadmap with business objectives and More ❯

teams offer you an environment that will present you with exciting challenges - be it through the support and further development of legacy systems or the introduction of modern technologies such as AI, machine learning and highly automated trading applications. Our Technology department of around 300 employees works … a multi-year project to revamp a large part of our equity trading technology stack. This greenfield project will involve designing and implementing new systems, such as pre/post-trade risk engines, market data distribution, reference data handling, and the build-up of trading gateways, while also aligning … the system supports global equity market trading with high availability. Develop bespoke trading workflows tailored to clients across multiple trading desks. Design and optimise systems to dynamically scale in response to market events such as interest rate decisions or breaking news. Collaborate closely with other IB Engineering teams and More ❯

a large-scale publishing platform. This platform integrates both modern and legacy technologies, and your role will be pivotal in maintaining existing systems while contributing to a long-term transition toward a more scalable and modern architecture. You ll work across the stack using technologies like .NET … love to hear from you. Key Responsibilities Design, develop, and maintain scalable web applications using .NET and Vue.js. Support and enhance legacy systems built with older .NET and Vue.js versions. Optimize database performance (SQL Server, MongoDB). Collaborate with cross-functional teams to gather requirements and implement … as Camunda. Proficient in automated testing using frameworks like NUnit or Playwright. Understanding of architectural patterns such as Domain-Driven Design (DDD), event-driven systems, and microservices. Knowledge of Behavior-Driven Development (BDD) and Test-Driven Development (TDD) methodologies. What s on Offer 4 Wellbeing days annually. Access to More ❯

a large-scale publishing platform. This platform integrates both modern and legacy technologies, and your role will be pivotal in maintaining existing systems while contributing to a long-term transition toward a more scalable and modern architecture. You’ll work across the stack using technologies like .NET … love to hear from you. Key Responsibilities Design, develop, and maintain scalable web applications using .NET and Vue.js. Support and enhance legacy systems built with older .NET and Vue.js versions. Optimize database performance (SQL Server, MongoDB). Collaborate with cross-functional teams to gather requirements and implement … as Camunda. Proficient in automated testing using frameworks like NUnit or Playwright. Understanding of architectural patterns such as Domain-Driven Design (DDD), event-driven systems, and microservices. Knowledge of Behavior-Driven Development (BDD) and Test-Driven Development (TDD) methodologies. What’s on Offer 4 Wellbeing days annually. Access to More ❯

data scientists, analysts, business stakeholders) to develop and optimize data pipelines, workflows, and data models. Guide and support the migration of legacy systems to Databricks, ensuring seamless transitions from legacy to cloud-based environments. Ensure data integrity, security, and compliance with financial industry regulations. Build More ❯

of a broader modernisation programme transitioning into a cloud-native Python and Databricks environment . As the business moves away from legacy systems and invests in modern architecture, you’ll work at the intersection of stability and transformation — ensuring continuity in existing applications while helping shape the … technologies like React . Support mission-critical regulatory applications as part of a collaborative, Agile feature team. Contribute to the strategic migration from legacy platforms to a cloud-based architecture using Python , Azure , and Databricks . Apply best practices in DevOps, CI/CD, and test-driven development. … as Jira, Docker, Kubernetes, Octopus, Artifactory, Oracle, and SQL Server. A problem-solver with a strong understanding of software development practices. Experience with regulatory systems in Financial Services is a plus, but not essential. Why Join? Play a pivotal role in a cloud transformation journey using modern data and More ❯

a large-scale publishing platform. This platform integrates both modern and legacy technologies, and your role will be pivotal in maintaining existing systems while contributing to a long-term transition toward a more scalable and modern architecture. You’ll work across the stack using technologies like .NET … love to hear from you. Key Responsibilities Design, develop, and maintain scalable web applications using .NET and Vue.js. Support and enhance legacy systems built with older .NET and Vue.js versions. Optimize database performance (SQL Server, MongoDB). Collaborate with cross-functional teams to gather requirements and implement … as Camunda. Proficient in automated testing using frameworks like NUnit or Playwright. Understanding of architectural patterns such as Domain-Driven Design (DDD), event-driven systems, and microservices. Knowledge of Behavior-Driven Development (BDD) and Test-Driven Development (TDD) methodologies. What’s on Offer 4 Wellbeing days annually. Access to More ❯