1 to 25 of 93 Permanent Legacy Systems Jobs in London

in cloud architecture and implementation 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 or Windows-based x86 servers PREFERRED QUALIFICATIONS 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 with analyzing on-premises mainframe applications and data stores to formulate plans for modernizing workloads that achieve customer's More ❯

in cloud architecture and implementation. - 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 or Windows-based x86 servers. PREFERRED QUALIFICATIONS - Strong communication skills with the ability to explain … both technical and non-technical 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 with analyzing on-premises mainframe More ❯

Senior AI Developer £80,000 + bonus + benefits International eCommerce organisation is looking for a Senior AI Developer to lead the modernization of core systems using AI to improve performance and efficiency. We need a highly skilled Lead Developer with proven experience migrating legacy systems and implementing AI-powered solutions. Experience with modern languages and … frameworks is a plus. About the Role: Play a pivotal role in transforming technology stack and driving the adoption of AI-powered tools to enhance development workflows. Modernising critical systems and implement intelligent solutions that support business growth. Key Responsibilities: Lead the migration of legacy systems to a modern tech stack (cloud platforms, APIs) Design and … teams to redesign and improve core business applications Mentor junior developers, fostering a culture of continuous learning and innovation Essential Skills: 5+ years’ software development experience, including significant legacy system modernization Relational database expertise (e.g., Microsoft SQL Server) Familiarity with REST APIs and cloud infrastructure Hands-on experience with AI-based developer tools (e.g., GitHub Copilot, ChatGPT, Tabnine More ❯

partner for a government agency's transformation programme. They are looking for a Lead Technical Architect to join the a high-profile initiative aimed at modernising legacy systems and improving data validation across the client's business gateway. This is a fully remote role, working within a blended agile team of consultancy and end client staff. You … To be considered, you'll need: Strong background in technical architecture within large-scale digital programmes Deep understanding of API Gateway design and enhancement Experience modernising legacy systems and migrating to cloud-native platforms Solid grasp of AWS (API Gateway, Lambda, S3, VPC) Familiarity with Java, DB2, relational databases, and network concepts Desirable experience includes: OpenAPI schemas More ❯

someone who has good programming skills Microsoft programming languages. The team uses cutting edge technology, but you will ideally be versed with a wide variety of legacy systems and migrating away from these to new cutting-edge technology solutions. These positions report to the Integration Lead and Architect and you will be working alongside a team of … . Responsibilities: Design and support all integration processes including migrations to and from new businesses as well as within internal applications and databases. Migrations away from legacy systems into new applications Review, support, feedback and size requirements produced by the Analysis team. Manage your delivery commitments within the relevant sprints to ensure timely and quality delivery of More ❯

someone who has good programming skills Microsoft programming languages. The team uses cutting edge technology, but you will ideally be versed with a wide variety of legacy systems and migrating away from these to new cutting-edge technology solutions. These positions report to the Integration Lead and Architect and you will be working alongside a team of … . Responsibilities: Design and support all integration processes including migrations to and from new businesses as well as within internal applications and databases. Migrations away from legacy systems into new applications Review, support, feedback and size requirements produced by the Analysis team. Manage your delivery commitments within the relevant sprints to ensure timely and quality delivery of More ❯

The Opportunity We're partnering with a leading bank on a major transformation programme: the build and migration of a proprietary lending platform that will replace legacy systems and sit at the heart of their future banking operations. This is a high-profile programme where you'll work closely with senior leadership, delivering change that impacts core … leadership, providing visibility, assurance, and strategic direction. What We're Looking For Proven experience as a Programme Manager in banking or financial services . Strong knowledge of core banking systems ; lending platform exposure is highly desirable. Excellent communication and stakeholder management skills - able to influence at executive level. Track record in governance, risk management, and regulatory programmes . Ability … to lead matrixed teams and work across multiple business areas. Comfortable in environments moving from legacy systems to proprietary platforms . RSG Plc is acting as an Employment Agency in relation to this vacancy. More ❯

communication, to reach personal and team performance. Architectural Strategy and Planning Define and maintain the enterprise application architecture roadmap across SaaS and on-prem/packaged solutions. Align IT systems with business goals, ensuring scalability, flexibility, and integration. Evaluate and plan migration paths from legacy systems to SaaS where appropriate. Integration & Interoperability Design robust, secure, and … scalable integration architectures across disparate SaaS and packaged systems, with the support of our internal Integration Hub team Use middleware (e.g., Mulesoft, Dell Boomi, Azure Logic Apps) or APIs to bridge cloud and on-prem systems. Ensure data consistency, identity federation, and single sign-on across systems. Governance & Standards Establish architectural standards, best practices, and governance models. Ensure compliance More ❯

With Intelligence is a leading provider of data and insights for the global asset management industry. We are scaling up our technological capabilities, harnessing the power of advanced data systems, AI, and modern cloud-based infrastructure to build a flexible, event-driven platform that supports our growing suite of digital products. We're assembling a top-tier London-based … transformation. This role offers the opportunity to be a key contributor to our technology evolution, leveraging your deep .NET experience to influence product direction, mentor teams, and ensure our systems are robust, scalable, and modern. Role Overview As a .Net Specialist you will be leading teams in the design, development, and implementation of software solutions using the .NET framework. … in C# Strong knowledge of .NET Framework 4.x and .NET Core 3. Experience with ASP.NET Web Forms, ASMX Web Services, and MVC Familiarity with VB.NET (for legacy systems) Infrastructure & DevOps: Experience with AWS for hosting and infrastructure Skilled in IIS configuration and deployment Strong knowledge of TeamCity for CI Experience with Octopus Deploy Familiarity with Git for More ❯

grow into a well-rounded architecture role, shaping technical standards and supporting strategic migrations. You'll work directly with the Head of Architecture to help modernize legacy systems, set engineering standards, assess project solutions, and support secure, compliant platform operations. Key Responsibilities Collaborate with tech leads and engineering teams to: Review and support architectural decisions for new … RDS, Kubernetes) Improving observability across platforms (e.g., New Relic, Grafana, Logz.io) Participate in threat modelling, vulnerability assessments, and client security responses Help assess and reduce technical debt across legacy services Work across teams to promote high technical standards and help influence best practice adoption Communicate clearly with technical and non-technical stakeholders to explain architectural decisions and rationale … software engineering or DevOps (e.g., C#, Python, JavaScript, Kubernetes) Familiarity with cloud architecture - especially AWS (RDS, IAM, EC2, EKS, networking) Experience working with or supporting microservices and container-based systems Strong awareness of security and compliance principles, especially in regulated industries Knowledge of CI/CD, logging, and monitoring tools (e.g., New Relic, Grafana, Terraform) Familiarity with data architecture More ❯

seasoned AWS Data Engineer to join our team and contribute to the development of scalable, secure, and high-performance data solutions. This role involves modernizing mainframe legacy systems, building robust data pipelines, and enabling advanced analytics using AWS-native technologies. You’ll collaborate with cross-functional teams and play a key role in shaping our data strategy. … using AWS S3, with strong understanding of data lifecycle, access control, and performance optimization. Hands-on experience migrating data from Mainframes to AWS, including transformation and validation of legacy formats. Proficiency in reading and processing VSAM data using Copybooks and the Cobrix library. Experience implementing data retention and archival strategies in cloud environments. Strong understanding and practical implementation … documentation skills to clearly articulate data flows, architecture decisions, and technical findings. Experience with pair programming, conducting code reviews, and mentoring team members. Proven ability to reconcile data across systems and ensure data quality and integrity. Experience with data cataloging and metadata management using tools like AWS Glue Data Catalog. Demonstrated self-sufficiency in exploring new tools, troubleshooting issues More ❯

seasoned AWS Data Engineer to join our team and contribute to the development of scalable, secure, and high-performance data solutions. This role involves modernizing mainframe legacy systems, building robust data pipelines, and enabling advanced analytics using AWS-native technologies. You’ll collaborate with cross-functional teams and play a key role in shaping our data strategy. … using AWS S3, with strong understanding of data lifecycle, access control, and performance optimization. Hands-on experience migrating data from Mainframes to AWS, including transformation and validation of legacy formats. Proficiency in reading and processing VSAM data using Copybooks and the Cobrix library. Experience implementing data retention and archival strategies in cloud environments. Strong understanding and practical implementation … documentation skills to clearly articulate data flows, architecture decisions, and technical findings. Experience with pair programming, conducting code reviews, and mentoring team members. Proven ability to reconcile data across systems and ensure data quality and integrity. Experience with data cataloging and metadata management using tools like AWS Glue Data Catalog. Demonstrated self-sufficiency in exploring new tools, troubleshooting issues More ❯

seasoned AWS Data Engineer to join our team and contribute to the development of scalable, secure, and high-performance data solutions. This role involves modernizing mainframe legacy systems, building robust data pipelines, and enabling advanced analytics using AWS-native technologies. You’ll collaborate with cross-functional teams and play a key role in shaping our data strategy. … using AWS S3, with strong understanding of data lifecycle, access control, and performance optimization. Hands-on experience migrating data from Mainframes to AWS, including transformation and validation of legacy formats. Proficiency in reading and processing VSAM data using Copybooks and the Cobrix library. Experience implementing data retention and archival strategies in cloud environments. Strong understanding and practical implementation … documentation skills to clearly articulate data flows, architecture decisions, and technical findings. Experience with pair programming, conducting code reviews, and mentoring team members. Proven ability to reconcile data across systems and ensure data quality and integrity. Experience with data cataloging and metadata management using tools like AWS Glue Data Catalog. Demonstrated self-sufficiency in exploring new tools, troubleshooting issues More ❯

seasoned AWS Data Engineer to join our team and contribute to the development of scalable, secure, and high-performance data solutions. This role involves modernizing mainframe legacy systems, building robust data pipelines, and enabling advanced analytics using AWS-native technologies. You’ll collaborate with cross-functional teams and play a key role in shaping our data strategy. … using AWS S3, with strong understanding of data lifecycle, access control, and performance optimization. Hands-on experience migrating data from Mainframes to AWS, including transformation and validation of legacy formats. Proficiency in reading and processing VSAM data using Copybooks and the Cobrix library. Experience implementing data retention and archival strategies in cloud environments. Strong understanding and practical implementation … documentation skills to clearly articulate data flows, architecture decisions, and technical findings. Experience with pair programming, conducting code reviews, and mentoring team members. Proven ability to reconcile data across systems and ensure data quality and integrity. Experience with data cataloging and metadata management using tools like AWS Glue Data Catalog. Demonstrated self-sufficiency in exploring new tools, troubleshooting issues More ❯

the next 12 months, we're implementing an ERP system , including an FP&A Planning tool . You will be central to that transition-supporting data migration , maintaining legacy reporting , and helping define our future-state planning and reporting environment . This role focuses on data and modelling, working in close partnership with a peer covering commercial, compliance … teams to ensure consistency across data, models, and assumptions. Maintain and evolve "as is" reporting during the ERP transition. Contribute to data migration , ensuring accuracy between legacy systems and new ERP. Support the implementation of the new ERP system , including rebuilding models, testing, and reporting redesign. Help define best practices for modelling and reporting in the post … data into actionable insight. Experience working cross-functionally, with the confidence to engage stakeholders and build relationships outside of Finance, at all levels, locally and globally. Comfortable operating during systems change and contributing to ERP implementations. Strong organisational skills, with an ability to effectively manage multiple pieces of work concurrently, competing deadlines and priorities, whilst maintaining a high-level More ❯

Key responsibilities of the role include: Designing and supporting the configuration of SAP SuccessFactors Recruiting and Onboarding modules Leading on cleansing and validating applicant data from legacy systems, in addition to supporting data migration activities Engaging hiring managers and teams to develop user-focused workflows and dashboards Delivering UAT planning, test scripts, issue tracking and change documentation … analysis, and user readiness Contribute to ongoing change-related activities to ensure deliverables reflect operational realities and user needs About you You’ll bring a solid understanding of HR systems or ATS platforms, with a strong understanding of how recruitment operates in a large, complex organisation. Your ability to bridge technical detail and human experience will be key to … managing technical details while also translating outcomes into user benefits. To be considered, please include the below details in your application: Experience implementing or maintaining applicant tracking or onboarding systems Familiarity with recruitment compliance including equalities monitoring and GDPR Strong analytical and problem solving skills with attention to detail Excellent stakeholder engagement skills, particularly with hiring managers Ability to More ❯

an IT professional, work closely with our business units. Our Technology teams offer you an environment full of exciting challenges - whether it's supporting and developing legacy systems or introducing modern technologies such as AI, machine learning, and highly automated trading applications. Our IT department, with around 300 employees, works mostly in an agile manner using a … flexible mindset, with the necessary willingness to learn about our comprehensive product range In-depth experience with Oracle RAC Ideally, initial experience in database administration, especially with relational database systems Knowledge of SQL, PL/SQL, Ansible, and scripting (Shell) is an advantage Know-how in Linux is a plus Very good written and spoken German and English skills More ❯

the day-to-day operation of the CRM platform, ensuring seamless functionality and troubleshooting issues. Support system integrations and monitor application performance. Manage data migration from Legacy systems, ensuring accuracy and integrity. Collaborate with Investment Bankers, Operations, Business Support, and IT teams to tailor DealCloud to business needs. Drive a modern IT Change & Release process for the More ❯

S/4HANA migration projects. You will work closely with functional and technical teams to ensure the successful extraction, transformation, and loading (ETL) of data from legacy systems into SAP environments. This role will focus on delivering high-quality data migration solutions using SAP Migration Cockpit, SAP Data Services (BODS), and other SAP data management tools. Key More ❯

S/4HANA migration projects. You will work closely with functional and technical teams to ensure the successful extraction, transformation, and loading (ETL) of data from legacy systems into SAP environments. This role will focus on delivering high-quality data migration solutions using SAP Migration Cockpit, SAP Data Services (BODS), and other SAP data management tools. Key More ❯

metrics and are scalable Helping to shape, evolve and document the architecture that underpins the existing platforms and services and lead their on-going transition from legacy systems to cloud based architectures. Interacting with project roles as required, to gain an understanding of the complex business environment, technical context, end client requirements and organisational strategic direction. Advising … its broader eco system Deployment automation technologies The ability to code, especially Infrastructure as code Network design, implementation, and administration A track record in the design and application of systems, leveraging automation technologies A deep understanding of Virtualisation and Container technologies Design of large, complex systems including practical experimentation and development skills Has both technical breadth and depth More ❯

a tight-knit development team to make key technical decisions, shape architecture, and drive feature development. Integrate seamlessly with third-party APIs, cloud platforms, and existing legacy systems where necessary. Own and evolve database design, models, and schemas to support new features and improve system efficiency. Craft performant SQL queries, stored procedures, and triggers to support mission … learning-focused, collaborative engineering culture. Qualifications & Requirements You thrive in a fast-moving, collaborative environment where ideas are welcomed, and experimentation is encouraged. 7+ years of experience building backend systems in a production environment. 3+ years of hands-on experience with modern software architecture and scalable frameworks. Proficiency in Java (Spring Boot), Python, or similar. Proficiency in JavaScript/…/CD pipelines, monitoring, containerization, etc.). Full stack development Knowledge of the dental or healthcare domain is a plus. Demonstrated experience in technical leadership or ownership of features, systems, or architecture. Experience with .NET Our Recruiting Process We try to make our process as simple as possible while still giving us opportunities to learn about each other. Virtual More ❯

a tight-knit development team to make key technical decisions, shape architecture, and drive feature development. Integrate seamlessly with third-party APIs, cloud platforms, and existing legacy systems where necessary. Own and evolve database design, models, and schemas to support new features and improve system efficiency. Craft performant SQL queries, stored procedures, and triggers to support mission … learning-focused, collaborative engineering culture. Qualifications & Requirements You thrive in a fast-moving, collaborative environment where ideas are welcomed, and experimentation is encouraged. 7+ years of experience building backend systems in a production environment. 3+ years of hands-on experience with modern software architecture and scalable frameworks. Proficiency in Java (Spring Boot), Python, or similar. Proficiency in JavaScript/…/CD pipelines, monitoring, containerization, etc.). Full stack development Knowledge of the dental or healthcare domain is a plus. Demonstrated experience in technical leadership or ownership of features, systems, or architecture. Experience with .NET Our Recruiting Process We try to make our process as simple as possible while still giving us opportunities to learn about each other. Phone More ❯

provide technical guidance and oversight of customisations, including plugins, workflows, Power Automate flows, and JavaScript, ensuring efficient, reusable, and well-documented code.* Integrate D365 CE with other applications and systems using tools like Azure Logic Apps, Power Automate, and custom APIs.* Oversee the Dynamics 365 environment to enable the successful delivery of their Digital Transformation.* Manage and control D365 … and maintenance for D365 CE applications, troubleshoot issues, and implement fixes and enhancements.* Assist in data migration tasks, ensuring accurate and secure transfer of data from legacy systems to D365 CE* Collaborate with cross-functional teams, including business analysts, project managers, and other developers, to deliver high-quality solutions.* Stay updated with the latest D365 CE features More ❯

of the cryptocurrency ecosystem. About the role: This role sits within GSR's global Data Engineering team, where you'll contribute to the design and development of scalable data systems that support our trading and business operations. You'll work closely with stakeholders across the firm to build and maintain pipelines, manage data infrastructure, and ensure data is reliable … responsibilities may include: Build and maintain scalable, efficient ETL/ELT pipelines for both real-time and batch processing. Integrate data from APIs, streaming platforms, and legacy systems, with a focus on data quality and reliability. Design and manage data storage solutions, including databases, warehouses, and lakes. Leverage cloud-native services and distributed processing tools (e.g., Apache More ❯