1 to 25 of 203 Legacy Systems Jobs in London

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 ❯

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 ❯

Systems Development Engineer , Maintenance Automation Platform Job ID: Amazon Spain Services, S.L.U. Amazon is looking for a Sr. Systems Development Engineer to support and maintain software solutions powering one of the world's largest Reliability, Maintenance Engineering (RME) enterprises. The RME Automation team supports the business through the integration and development of higher level software systems, realizing … an Industry 4.0 vision for the function. At a basic level, these systems connect our low-level automation systems with the cloud, and we operate across all aspects of the automation pyramid, from the device level to the enterprise level. The more complex systems are leveraging Machine Learning and Big Data to drive predictive actions, preventing downtime … installations. This is a fantastic opportunity to work with some of the best engineers in the industry and help support and shape the direction of automation and machine learning systems within one of the world's largest fulfillment networks. - You solve problems at their root, stepping back to understand the broader context. - You are a significant and autonomous contributor. 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 ❯

Guidewire Cloud Platform (GWCP) solutions for insurance and reinsurance carriers. As part of a System Integration (SI) partner team, you will play a critical role in modernizing core insurance systems, enabling seamless integration, and driving cloud transformation initiatives. You will collaborate with insurance carriers, technical teams, and cloud providers to design scalable, high-performance, and secure Guidewire solutions tailored … ClaimCenter, Reinsurance Management. Establish best practices for Guidewire DataHub, InfoCenter, and AI-driven analytics solutions. Drive legacy system modernization and define data migration strategies from on-premises systems to Guidewire Cloud. Ensure compliance with regulatory, security, and industry standards for insurance and reinsurance businesses. Solution and Develop Guidewire Cloud based APIs. System Integration & Implementation: Lead end-to … end integration between Guidewire applications and external platforms like CRM, Payments, AI models, Data Lakes, Catastrophe Risk Modelling Systems (RMS, AIR). Define cloud adoption roadmaps, hybrid cloud strategies, and multi-cloud deployments. Guide implementation teams on Guidewire configurations, extensions, and customization for all lines of Business and reinsurance workflows. Oversee performance optimization, scalability, and resilience of Guidewire applications 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 ❯

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 ❯

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 ❯

technologies Ability to recommend solutions to improve new and existing database systems. Assess data implementation procedures to ensure they comply with internal and external regulations. Install and organize information systems to guarantee functionality. Prepare accurate database design and architecture reports for management and executive teams. Oversee the migration of data from legacy systems to new solutions. … Educate staff members through training and individual support. Offer support by responding to system problems in a timely manner. Requirements: Strong knowledge of database structure systems and data mining. Knowledge of systems development, including system development life cycle, project management approaches and requirements, design and testing techniques Proficiency in data modeling and design, including SQL development and database 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 ❯

technologies Ability to recommend solutions to improve new and existing database systems. Assess data implementation procedures to ensure they comply with internal and external regulations. Install and organize information systems to guarantee functionality. Prepare accurate database design and architecture reports for management and executive teams. Oversee the migration of data from legacy systems to new solutions. … Educate staff members through training and individual support. Offer support by responding to system problems in a timely manner. Requirements: Strong knowledge of database structure systems and data mining. Knowledge of systems development, including system development life cycle, project management approaches and requirements, design and testing techniques Proficiency in data modeling and design, including SQL development and database 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 ❯

Location: London Reports to Director for Technology for Group and Operations The Enterprise Solution Architect for Technology plays a critical role in shaping Aztec Groups 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 enterprise-wide technology strategies, focusing … and cloud adoption. As a 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, ensuring alignment with business strategy … high-quality deliverables. Continuous Improvement: Identify opportunities for process improvements and drive initiatives to enhance the overall technology landscape. Qualifications & Experience Bachelors or masters 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, Strong knowledge of modern enterprise 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 ❯

Deliver transformation of IT practices to exploit modern best practices such as DevOps, DevSecOps, automation agents and generative AI Define strategies to migrate, modernise and transform legacy systems onto modern architectures To provide technical, sectoral and design leadership to a highly skilled and motivated expert technical team To work with customer senior management and technology leaders assisting … PRINCE2) Agile (e.g. PSM or CSM Scrum Master) One or more certifications that demonstrate application or technical specialisms are desirable, such as: IT Security (e.g. CISSP, CEH, CCSP) ERP Systems (e.g. Oracle, SAP, Sales Force or MS Dynamics certifications) Product or application specialisms (e.g. O365, SharePoint, CRM, Operational Technology) Technical Delivery Experience Extensive Solution Design, development, and delivery experience More ❯

looking for a talented Data Architect to help shape the future of its data landscape. This high-priority initiative will see the organisation move from complex legacy systems to a modern, cloud-based environment , leveraging the power of Azure, Python, and Databricks . You will be central to designing the data architecture that underpins this transformation, ensuring … What Youll Be Doing: Design and implement robust, scalable data architecture on the Microsoft Azure cloud platform. Lead the adoption of Databricks and cloud-native tools to modernise legacy systems. Define data standards, domains, and governance frameworks to support business-critical functions like … trading, risk, operations, and regulatory reporting. Build both real-time and batch data pipelines to support fast, data-driven decision-making. Model enterprise data structures and ensure alignment across systems and teams. Document metadata, lineage, and ownership to support compliance and transparency. Collaborate closely with Data Engineers , Software Developers , and Business Stakeholders to align technical solutions with commercial needs. More ❯