22 of 22 Legacy Systems Jobs in the Thames Valley

fast-growing, acquisition-led organisation. Your core mission will be to migrate operational (CRM) and in time, finance data from multiple legacy systems into Microsoft Dynamics, repeatedly, reliably, and under pressure. You will work across: Bespoke, undocumented, and at times, home-grown systems SaaS platforms (e.g. … with minimal hand-holding, in a demanding BAU + project environment. What Youll Be Doing For each acquired business, analyse legacy source systems (often undocumented) Understand and interrogate data models at source and target (D365/Dynamics) Perform source-to-target mapping Extract, cleanse, transform, and load ...

team of 50+ engineers and product professionals and manage a multi-million-pound technology budget. The technology estate includes legacy and modern systems (Delphi, .NET, Go, AWS, SQL Server). A serverless AWS migration is under evaluation, supported by an AI-driven PoC - you will decide … regulated vertical SaaS Background in investor-backed or portfolio-owned software businesses Practical exposure to AI-augmented development approaches Experience modernising legacy systems using code-as-data or knowledge graph techniques Chief Technology Officer (CTO) Location: Buckinghamshire - (2 Days week in office ...

risks, and collaborate closely with technical and business stakeholders. Key Responsibilities Design, develop, and execute ETL processes to migrate data from legacy systems to target platforms. Write and optimise complex SQL queries (preferably MySQL) to support data extraction, transformation, and validation. Apply the full data quality framework … resolve data-related issues promptly. Ensure migrations comply with data governance, security, and regulatory requirements. Work with case management software and related systems to understand data structures and workflows. Qualifications Essential: Proven experience in public sector large-scale data migration projects. Strong SQL development skills within MySQL environments. Solid ...

risks, and collaborate closely with technical and business stakeholders. Key Responsibilities Design, develop, and execute ETL processes to migrate data from legacy systems to target platforms. Write and optimise complex SQL queries (preferably MySQL) to support data extraction, transformation, and validation. Apply the full data quality framework … resolve data-related issues promptly. Ensure migrations comply with data governance, security, and regulatory requirements. Work with case management software and related systems to understand data structures and workflows. Qualifications Essential: Proven experience in public sector large-scale data migration projects. Strong SQL development skills within MySQL environments. Solid ...

risks, and collaborate closely with technical and business stakeholders. Key Responsibilities Design, develop, and execute ETL processes to migrate data from legacy systems to target platforms. Write and optimise complex SQL queries (preferably MySQL) to support data extraction, transformation, and validation. Apply the full data quality framework … resolve data-related issues promptly. Ensure migrations comply with data governance, security, and regulatory requirements. Work with case management software and related systems to understand data structures and workflows. Qualifications Essential: Proven experience in public sector large-scale data migration projects. Strong SQL development skills within MySQL environments. Solid ...

/CD pipelines and developer tooling, while embedding security-by-default, reliability and scalability into the platform. You'll modernise legacy systems, build new backend capabilities, and make pragmatic engineering decisions that balance delivery speed, quality and long-term maintainability. Core Responsibilities Platform Engineering … reliability, scalability, and cost efficiency through automation and platform standards Backend Engineering Own, maintain, and evolve backend services across legacy and greenfield systems Design and implement scalable backend architectures using Node.js, TypeScript, and NestJS Build and operate RESTful APIs and event-driven systems (queues/topics ...

trillion on benefits every year. It's their second-largest cost after payroll — yet the entire category is still running on legacy systems and outdated assumptions. The space is primed for transformation: despite its scale, it's been almost completely overlooked by AI-first startups. Incumbents — including … resident expert. You won't just be tuning hyperparameters in a notebook; you will be a core software engineer architecting the complex systems that make AI useful in production. In the immediate future, your time will be split between crafting complex AI processing architectures (40%) and hands-on data ...

integration layers (OIC) to curate clean, well-modelled datasets. Contribute to data migration activities, ensuring accuracy, integrity and auditability throughout transitions from legacy systems. Apply security-by-design, access controls and logging appropriate for regulated MOD environments. Operate in Agile delivery squads with APEX devs, data engineers, integration ...

integration layers (OIC) to curate clean, well-modelled datasets. Contribute to data migration activities, ensuring accuracy, integrity and auditability throughout transitions from legacy systems. Apply security-by-design, access controls and logging appropriate for regulated MOD environments. Operate in Agile delivery squads with APEX devs, data engineers, integration ...

integration layers (OIC) to curate clean, well-modelled datasets. Contribute to data migration activities, ensuring accuracy, integrity and auditability throughout transitions from legacy systems. Apply security-by-design, access controls and logging appropriate for regulated MOD environments. Operate in Agile delivery squads with APEX devs, data engineers, integration ...

data centres and cloud environments. Key focus areas include: Leading the migration from Nomad to Kubernetes across a hybrid infrastructure environment Designing highly available systems that support real-time trading operations Expanding the firm's cloud footprint (AWS/Azure/GCP) while maintaining on-prem capabilities Owning projects … from design through production What you'll need: Production experience with Kubernetes (EKS/AKS/GKE or bare-metal) Strong Linux systems background; Windows experience is beneficial Track record delivering cloud migrations and managing hybrid environments Experience supporting mission-critical, highly available systems What makes this different ...

daily by investment, risk, finance, and operations. You will play a pivotal role as the firm continues its migration away from legacy systems and enhances its bespoke internal platforms. The Role As a Business Engineering Developer, you will: Build, enhance, and maintain applications supporting mortgage origination, valuation … problem-solving Significant influence across the organisation You will join at a time of major investment in technology, with clear opportunities to contribute to systems that will define the firm's next decade. What We're Looking For Strong Python skills (pandas, NumPy, SQLAlchemy, etc.) Experience working in business ...

/Regulatory Technology team within a leading global investment bank working on business-critical regulatory reporting platforms. You'll help modernise legacy systems and build strategic, cloud-based data solutions used across the firm. You'll work in a collaborative Agile squad focused on Java services, Spark ...

programs leveraging Google Cloud Platform (GCP) and modern data engineering frameworks. The role involves defining the data strategy, overseeing migration from legacy systems to cloud-native architectures, and implementing scalable data pipelines and analytics solutions using GCP services and Data Factory. The candidate will manage cross-functional ...

programs leveraging Google Cloud Platform (GCP) and modern data engineering frameworks. The role involves defining the data strategy, overseeing migration from legacy systems to cloud-native architectures, and implementing scalable data pipelines and analytics solutions using GCP services and Data Factory. The candidate will manage cross-functional ...

your career at the intersection of technology, mathematics, and finance? Join an elite global trading firm where innovation drives everything — no legacy systems, no bureaucracy, just cutting-edge tech and world-class mentorship. You'll work on greenfield projects from day one, collaborating with exceptional engineers, quants … researchers to build the systems and models shaping the future of global trading. What You'll Do Design and enhance advanced trading systems and analytics platforms Develop and implement your own quantitative models and research ideas Collaborate closely with top technologists, quants, and portfolio managers Learn fast, build ...

/Regulatory Technology team within a leading global investment bank. You'll work on business-critical regulatory reporting platforms, helping modernise legacy systems and build strategic, cloud-based data solutions used across the firm. You'll be part of a collaborative Agile squad focused on Java services ...

talented team on our mission to help people and businesses thrive through technology. If you love untangling hard problems, improving legacy systems, and shipping clean, tested code, you'll fit right in. Your role as a Senior PHP Software Engineer at True9: Lead the back-end - write ...

technical depth, gain exposure to DevOps, cloud, and observability practices, and help define how we build software at Firenze. With no legacy systems, you'll be shaping our platform from the ground up and growing alongside a team that values mentorship, learning, and engineering excellence. Key Responsibilities … pipelines) and learn how to scale reliable delivery. Performance & Observability: Gain hands-on experience with monitoring tools and learn how to build observable systems from day one. Documentation & Developer Experience: Help create clear technical docs and reusable tooling that makes development smoother for everyone. Cross-Functional Collaboration: Partner with ...

Hybrid Integration Design: Lead the design and implementation of data solutions that integrate Azure cloud-native services with legacy SQL Server systems and third-party APIs and data feeds. Data Modelling and Standards: Develop and enforce data modelling standards (conceptual, logical, physical) across platforms. Promote reuse, consistency … decisions. Experience and Skills Required: Experience with Data Architecture and governance, public-cloud platforms (Azure, AWS, GCP) , SQL Server, data integration with third-party systems, ideally Microsoft Fabric Experience with data modelling and metadata management Relevant degree or post-graduate qualification, ideally certification in Cloud Architecture and Data Management ...

Lead engineering delivery, infrastructure, and security while partnering with Product, Risk, and Operations. • Design and implement a migration path from legacy custodial systems to vault-native structures. • Champion engineering excellence across quality, reliability, security, and operational discipline. • Build and scale a world-class engineering team with clear … leadership roles. • Proven track record of scaling engineering teams in high-growth B2B, fintech, or infrastructure-led environments. • Strong technical background in cloud-native systems, distributed architectures, and security-critical platforms. • Experience managing parallel systems and executing controlled migrations without client disruption. • Excellent communication skills and ability ...

performance, scalable database solutions. This is a hands-on role for someone who genuinely enjoys writing proper PL/SQL—not just babysitting legacy code. What You’ll Need 10+ years’ commercial experience working with Oracle PL/SQL Strong, clean, and efficient Oracle SQL & PL/… similar fast-paced environment Nice to Have (but not deal-breakers) Performance tuning and query optimisation Experience supporting or refactoring legacy Oracle systems Exposure to modern development practices and version control ...