1 to 25 of 165 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 • 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 ❯

tools to accelerate and enhance the migration process, and we’re looking for developers who are excited by the opportunity to work at the intersection of legacy systems, modern development, and AI-assisted engineering. Key Responsibilities - Collaborate with the existing team to re-engineer Oracle PLSQL 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 supports phased migration. - Use AI-assisted tools to analyze, translate, and optimize legacy code. - Support BAU operations during the … Required SkillsExperience - 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 More ❯

tools to accelerate and enhance the migration process, and we’re looking for developers who are excited by the opportunity to work at the intersection of legacy systems, modern development, and AI-assisted engineering. Key Responsibilities - Collaborate with the existing team to re-engineer Oracle PLSQL 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 supports phased migration. - Use AI-assisted tools to analyze, translate, and optimize legacy code. - Support BAU operations during the … Required SkillsExperience - 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 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 .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 ❯

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 ❯

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 ❯

with long term extension. Daily rate of 480 €uros Required: 8 years+ Business Analysis experience 4-6 years iterative and waterfall development experience. Skills and experience : Degree in Information Systems/Systems Engineering or similar is desirable Proven work experience of working on high visibility projects in traditional environments with strong project governance (i.e highly regulated environments) Proven … Proven experience in system integration projects/master data management projects Proven experience in producing defining and documenting Product and Services Roadmaps Proven experience in documenting legacy systems, working with architects and business to reverse engineer systems Proven work experience as BI Business Analyst Proven experience of working in projects with offshore development teams Role specific More ❯

all post-trade data consumed by the front-office, as well as maintaining our real-time positions critical for correct trading of the Execution platform. This means we own systems to calculate P&L, risk and trading cost analysis to allow the firm to monitor fund performance and make investment decisions. We work closely with portfolio managers, traders and … in the process of migrating more of our data to Snowflake, leveraging technologies like AWS Batch, Apache Flink and AWS Step functions for orchestration and Docker containers. These new systems will respond in real-time to events such as position and price changes, trades and reference data updates. Processing this data efficiently and robustly is a challenging but rewarding … facet of this role. We need an experienced developer to work on a range of projects across the systems - with time spent on both legacy systems, new development and migration of systems to new environments and approaches. Training will be provided to quickly on-board the developer with the technologies used. You will gain ownership More ❯

team-focused culture. You will work closely with engineering teams, operations, internal stakeholders, and external suppliers to lead the secure integration, management, and optimisation of Operational Technology (OT) data systems that underpin Thames Water's digital transformation journey. We are seeking an OT Data Systems Engineer to manage and develop OT data structures and system integrations across Thames … Water's water and wastewater infrastructure. You will play a key role in transitioning our data architecture, leading database re-structuring efforts, decommissioning legacy systems, and supporting the implementation of enterprise-scale data platforms like Aveva PI. This role ensures consistent, efficient, and secure data flow from our SCADA systems to enterprise applications. What you'll … do as an OT Data Systems Engineer: OT Data Integration & Development: Manage and maintain secure integration of SCADA and OT data with enterprise systems. Lead the planning, design, and implementation of database architecture upgrades and data migrations. Develop and maintain data reporting systems, stream processing, and data visualisation tools. Support the decommissioning of legacy platforms, including More ❯

SAP Project Systems - Sr Manager IT Architecture page is loaded SAP Project Systems - Sr Manager IT Architecture Apply locations United Kingdom - Uxbridge posted on Posted Yesterday job requisition id R At Gilead, we're creating a healthier world for all people. For more than 35 years, we've tackled diseases such as HIV, viral hepatitis, COVID-19 and … work environment where our differences are valued, and everyone feels respected and empowered to bring their authentic selves to work. Job Summary The role for S4/Hana Projects Systems will drive successful business process improvement and technical resolution of emerging Project system issues and requests. The role will partner with business subject matter experts and managers in the … areas of Report-to-Record, Projects, Source-to-Settle, and Plan-to-Deliver. Essential Duties and Job Functions: Understand the SAP Project systems technology landscape and how it affects the business operations Interact with business to understand business requirements to conclude solutions, configuration, testing and support Demonstrated track record of implementing Project solutions in more than couple of projects More ❯

SAP Project Systems - Sr Manager IT Architecture page is loaded SAP Project Systems - Sr Manager IT Architecture Apply locations United Kingdom - Uxbridge posted on Posted Yesterday job requisition id R At Gilead, we're creating a healthier world for all people. For more than 35 years, we've tackled diseases such as HIV, viral hepatitis, COVID-19 and … work environment where our differences are valued, and everyone feels respected and empowered to bring their authentic selves to work. Job Summary The role for S4/Hana Projects Systems will drive successful business process improvement and technical resolution of emerging Project system issues and requests. The role will partner with business subject matter experts and managers in the … areas of Report-to-Record, Projects, Source-to-Settle, and Plan-to-Deliver. Essential Duties and Job Functions: Understand the SAP Project systems technology landscape and how it affects the business operations Interact with business to understand business requirements to conclude solutions, configuration, testing and support Demonstrated track record of implementing Project solutions in more than couple of projects More ❯

services. You will serve as 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 .NET cloud-native services. We … needs by focusing on innovation 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 strong observability and integration with … Terraform, and secure service architecture. 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, S3, Lambda). Experience with More ❯

customer experience as well as business productivity & efficiency.The technology currently supporting John Lewis shops and contact centres is a blend of commercially available third-party platforms, bespoke in-house systems, and legacy applications that we are actively modernising, all interconnected through complex integrations with each other and other areas of the business. Find out more about being … roadmap for John Lewis shops and contact centres with the overarching business objectives. Your influence will extend to key decisions that shape the operation of shop and contact centre systems and guide how engineering drives change across this complex business area. This will involve influencing how work is managed-whether agile, waterfall, or hybrid- including the effectiveness and measurement … broker models, RESTful, streams, event based). Knowledge/experience of techniques used to increase resilience and/or scalability of systems. Experience of applying techniques from Lean and Systems Thinking. Desirable skills/experience you may have Retail or Contact Centre experience Working with legacy systems Will have been a hands-on software engineer for More ❯

complex database solutions that support our enterprise applications and analytics systems. You will play a critical role in defining data strategy, ensuring scalability, security, and performance of SQL-based systems, and collaborating with cross-functional teams to support business goals. Key Responsibilities: Design, architect, and implement high-performance SQL Server/Oracle/PostgreSQL solutions. Define data architecture standards … and best practices for the organization. Develop complex queries, stored procedures, triggers, and performance tuning strategies. Lead the migration of legacy systems to modern data platforms (e.g., cloud-based SQL solutions). Collaborate with DevOps, application developers, BI engineers, and data scientists. Ensure high availability, disaster recovery, and data integrity across platforms. Perform database modeling, normalization, and … on database solutions. Work with stakeholders to understand data needs and translate them into technical solutions. Required Skills & Qualifications: Bachelor's or master's degree in computer science, Information Systems, or related field. 10+ years of experience in SQL development, data architecture, or database administration. Expert knowledge of relational database systems like Microsoft SQL Server, Oracle, or PostgreSQL. More ❯

tackle complex challenges using tools like Hadoop, Spark, and modern visualisation frameworks while implementing automation that drives government efficiency. You'll collaborate with stakeholders to transform legacy systems, implement data governance frameworks, and ensure solutions meet the highest security standards. Our deep expertise in public sector digital transformation and established presence across defence and government organisations offer … unique opportunities to shape the future of UK public services through innovative data-driven solutions. With our strong technical foundation and focus on mission-critical systems, you'll be part of a team delivering nationally significant projects that have a real impact on public service delivery. If you're passionate about applying cutting-edge data science and engineering in … you will: Data Engineering Focus: Design, implement, and maintain scalable data pipelines and ETL processes Develop and maintain data warehouses and data lakes Implement data quality monitoring and validation systems Create and maintain data documentation and cataloguing systems Optimize data storage and retrieval systems Implement data security and governance frameworks Build and maintain data APIs and services 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 ❯

driven bank. As an IT professional, you will work closely with our business units. Our technology teams offer an environment with exciting challenges - supporting and developing legacy systems or introducing modern technologies such as AI, machine learning, and highly automated trading applications. Our Technology department, comprising around 300 employees, works largely in an agile manner using a … platform. Monitor market trends in cryptocurrencies and digital assets to identify new business opportunities and relevant regulatory requirements. Who are we looking for? University degree, ideally in business information systems, business administration, economics, or computer science. Strong knowledge of digital assets/cryptocurrencies. Experience in creating user stories and working with IT teams (e.g., agile/scrum). Experience More ❯

/C# and WPF to guide the evolution of our LegalTech products. This is a hands-on leadership and technical role where you'll set technical direction, architect scalable systems, and ensure the delivery of high-quality, performant applications-ranging from modern WPF-based desktop software to robust cloud services. You'll play a critical part in mentoring engineers … embed testing into architecture and development, improving testability and enabling earlier defect detection. Use profiling and diagnostics tools to address performance, memory, and runtime optimizations. Refactor legacy systems to modern standards, boosting maintainability, coverage, and stability. Leverage tools like Autofac and clean architecture patterns to maintain loosely coupled and testable codebases. Team Mentorship & Collaboration Act as a More ❯

Responsibilities: Work with clients to 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 with validation controls Track … strategies Produce detailed status reports, 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 to requirements gathering, system configuration … complex capital structures, and accurately 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 accounting is highly desired. Experience More ❯

Responsibilities: Work with clients to 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 with validation controls Track … strategies Produce detailed status reports, 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 to requirements gathering, system configuration … complex capital structures, and accurately 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 accounting is highly desired. Experience 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 ❯

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 ❯

be working on the latest and most cutting edge tech from the outset. If you are an expert in and passionate about designing and configuring Dynamics 365 Business Central systems then look no further! The role: Collaborating with clients to understand their business requirements and translate them into system configurations and customisations within Dynamics 365 Business Central. Designing and … enabling them to effectively utilise Dynamics 365 Business Central and maximise its potential. Performing data migration activities, ensuring the accurate and timely transfer of data from legacy systems to Dynamics 365 Business Central. Developing and maintaining technical documentation, including functional specifications, user guides, and training materials. Identifying opportunities for process improvements and advising clients on best practices More ❯