19 of 19 Permanent Legacy Code Jobs in Berkshire

on the market. Having received huge investment, they are on a journey to truly disrupt the industry and are not held back by any legacy code or old customers. This means that they're able to build out state-of-the-art, Greenfield code which can focus More ❯

in London, UK . This is a full-time, permanent role ideal for professionals who are passionate about building scalable backend systems and modernizing legacy architectures. You will play a key role in migrating .NET-based systems to Python , while collaborating closely with cross-functional teams to deliver high … and contribute to long-term strategic system improvements. Key Responsibilities: Develop, enhance, and maintain backend services using Python . Participate in the modernization of legacy .NET systems , including understanding and re-architecting existing logic in Python. Design and optimize SQL queries and manage relational database integrations . Collaborate with … stakeholders, architects, and other developers to design robust, scalable solutions. Participate in code reviews, testing, and deployment activities. Contribute to improving engineering best practices, performance, and maintainability. Requirements: Proven professional experience in Python development – a must. Strong skills in SQL and working with relational databases (e.g., PostgreSQL, MySQL, SQL More ❯

Stay abreast of the latest developments in C++ and related technologies, contributing to a progressive developer experience • Mentor and coach junior team members • Conduct code reviews, embedding quality and promoting best practices • Collaborate closely with other teams to ensure smooth delivery and knowledge distribution • Promote a balance between business … with multi-threading and complex memory management • Keen interest in continuous improvement and personal development • Experience with CI/CD pipelines • Adept in managing legacy code bases • Experience with higher level languages - specifically Python and C# would be beneficial • Comfortable working across technology domains and software stacks • Strong More ❯

Stay abreast of the latest developments in C++ and related technologies, contributing to a progressive developer experience • Mentor and coach junior team members • Conduct code reviews, embedding quality and promoting best practices • Collaborate closely with other teams to ensure smooth delivery and knowledge distribution • Promote a balance between business … with multi-threading and complex memory management • Keen interest in continuous improvement and personal development • Experience with CI/CD pipelines • Adept in managing legacy code bases • Experience with higher level languages - specifically Python and C# would be beneficial • Comfortable working across technology domains and software stacks • Strong More ❯

and market connectivity—working closely with researchers and PMs to iterate rapidly. The environment is flat, technical, and collaborative, with minimal bureaucracy and no legacy code. Tech: Core stack in C++ and Rust. Open to other OOP backgrounds, however. Custom protocol handling, kernel bypass networking. Strategy evaluation infrastructure and More ❯

Software Engineer | C#, SQL, Testing - Legacy Refactoring project @ a Systematic Hedge Fund Rate: £650-750 per day IR35: Outside Duration: 12 months+ Location: 3 days in the office per week in Moorgate/Liverpool Street We’re working with a high-performing, systematic hedge fund based in the City … experience as a hands-on software engineer Strong C#/.NET and SQL background, ideally in data-centric or financial systems Solid experience refactoring legacy applications without full test coverage Testing; You must be a meticulous Tester in TDD. Excellent at writing characterisation tests to lock down behaviour before … improving Strong software architecture knowledge, as you will be architecting the new product You must have a passion for refactoring to improve code quality and for automated testing at all levels; unit, integration & acceptance. You take pride in annotated, clean commits and structured workflows Having a ‘DevOps mindset’ and More ❯

Manage and mentor a growing team of backend/frontend engineers 🔧 Modern Engineering Environment: Work on a cloud-native, AI-enabled platform with minimal legacy code 💡 Impactful Work: Influence product direction and contribute to scaling mission-critical systems 🌐 Global Reach: Help deliver a platform used by large enterprise … define and execute development processes, sprint planning, and QA workflows Maintain a healthy balance between speed, quality, and technical debt Ensure best practices in code quality, documentation, and DevOps integration Your Profile 4+ years of experience in software engineering, with 1–2+ years in an engineering leadership or management … role Strong technical background (you don’t need to code daily, but should be comfortable leading technical discussions) Proven experience in a SaaS or product-driven environment (B2B a plus) Solid understanding of cloud infrastructure (AWS, GCP), CI/CD workflows, and agile development Interest or experience in AI More ❯

Manage and mentor a growing team of backend/frontend engineers 🔧 Modern Engineering Environment: Work on a cloud-native, AI-enabled platform with minimal legacy code 💡 Impactful Work: Influence product direction and contribute to scaling mission-critical systems 🌐 Global Reach: Help deliver a platform used by large enterprise … define and execute development processes, sprint planning, and QA workflows Maintain a healthy balance between speed, quality, and technical debt Ensure best practices in code quality, documentation, and DevOps integration Your Profile 4+ years of experience in software engineering, with 1–2+ years in an engineering leadership or management … role Strong technical background (you don’t need to code daily, but should be comfortable leading technical discussions) Proven experience in a SaaS or product-driven environment (B2B a plus) Solid understanding of cloud infrastructure (AWS, GCP), CI/CD workflows, and agile development Interest or experience in AI More ❯

driven team at the forefront of digital innovation – building high-impact web applications used by thousands of users daily. This isn’t about maintaining legacy code or minor UI tweaks. You’ll be hands-on with greenfield features from day one – collaborating closely with product managers, designers, and … take ownership across the full product lifecycle – from shaping concepts and wireframes through to architecture, development, and release – while also raising the bar in code quality, performance, and usability. Frontend Developer – Key Requirements: · Significant experience in a dedicated Frontend Developer or Web Engineer role · Strong commercial experience with modern More ❯

Stack Java Developer to join their highly skilled tech team. You'll be instrumental in building a brand-new trading platform from scratch, no legacy code, no tech debt, just modern tools and real impact. As part of a cross-functional team of experienced engineers and finance professionals … HTML, CSS, and Material UI Knowledge of Docker and container-based deployments AWS cloud experience What’s in it for you? Greenfield build – zero legacy systems Direct product impact – your work powers a flagship trading platform AI-friendly culture – work in a team that embraces innovation Private healthcare + More ❯

the top of their fields, pushing the boundaries of technology and finance every day. Innovation & Impact: Work in a modern, young codebase with minimal legacy code and technical debt. You’ll have the freedom to choose the best technology for the job, allowing you to innovate and deliver More ❯

meetups 🕒 Full-time | Salary: £70,000 – £90,000 What you’ll be doing Develop and maintain Java-based systems across multiple businesses Gradually modernise legacy code, introducing cleaner architecture and better development practices Work closely with onshore and offshore teams to deliver secure, stable solutions Identify opportunities for … our future stack Support a secure and compliant development environment What we’re looking for Solid Java development experience Comfortable working with and improving legacy codebases Familiarity with AWS and cloud-based systems Good communication skills and collaborative mindset Experience in (or interest in) regulated, secure software environments Bonus More ❯

meetups 🕒 Full-time | Salary: £70,000 – £90,000 What you’ll be doing Develop and maintain Java-based systems across multiple businesses Gradually modernise legacy code, introducing cleaner architecture and better development practices Work closely with onshore and offshore teams to deliver secure, stable solutions Identify opportunities for … our future stack Support a secure and compliant development environment What we’re looking for Solid Java development experience Comfortable working with and improving legacy codebases Familiarity with AWS and cloud-based systems Good communication skills and collaborative mindset Experience in (or interest in) regulated, secure software environments Bonus More ❯

a collaborative product team, helping unify multiple mobile apps into a single, modern platform. You’ll design and implement new features, maintain and refactor legacy code, and drive best practices in Flutter development. Role focus: Designing and building features for both existing and new Flutter apps Maintaining and … improving mobile architecture and code quality Writing unit and integration tests Integrating with RESTful APIs and backend services To be considered you will need to be able to display the following: Strong experience in Flutter and Dart (2+ years), with 4+ years total in mobile development Deep understanding of … mobile architecture and design patterns Experience building and scaling complex mobile apps Proficiency with Git and mobile testing frameworks Enjoy mentoring and code reviews Salary is up to £70k (will consider more for outstanding candidates). 4x per week in a London office. Private health/dental care Discretionary More ❯

GCP). Key Responsibilities Build, improve, and automate risk models. Collaborate with teams to refine risk strategies. Optimise reporting and infrastructure. Enhance and improve legacy codebase. What You’ll Need Expertise in Python, SQL, and GitLab. Experience in risk model development (LGD, PD, VaR, etc.). Background in banking More ❯

to researchers & traders. Hire and mentor the team that will scale this from “clever prototype” to “firm‐wide PnL driver”. Green‐field. No legacy code. You set the standards. The Opportunity All the levers, none of the red tape – direct line to the head of the HFT business More ❯

investment, a new leadership team, and a sharp focus on modernisation and cloud innovation. Why this is different: This isn’t about ripping up legacy code and starting over. It’s about carefully modernising a well loved product used by 350+ customers across Europe and the UK. The … a Delphi expert to help lead that journey. What makes it interesting: You’ll be the hands on Delphi champion, with support from a legacy savvy internal team and the freedom to guide modernisation best practices. The role is product-led, customer focused, role and you'll have the … technical evolution. You’ll thrive here if you: -Live and breathe Delphi (newer versions/frameworks especially) -Have experience in cloud environments or transitioning legacy apps - Bonus: Java or C# knowledge for cross-functional input More info : -HQ in Guildford (1 day per fortnight minimum, ideally 2 per week More ❯

with cross-functional teams, managing requests and troubleshooting issues Diagnosing problems by consulting with domain experts to broaden technical understanding Maintaining and supporting a legacy system, including its outdated deployment processes Support and enhance the current system, ensuring stability and functionality Implement updates within a legacy codebase, assuming … Refresh technical documentation as and when updates are made to the service Ensure all modifications undergo peer validation before being merged Push all approved code changes to the main project branch Design, execute, and pass feature-level and external API tests as appropriate Revise API documentation in alignment with More ❯

with cross-functional teams, managing requests and troubleshooting issues Diagnosing problems by consulting with domain experts to broaden technical understanding Maintaining and supporting a legacy system, including its outdated deployment processes Support and enhance the current system, ensuring stability and functionality Implement updates within a legacy codebase, assuming … Refresh technical documentation as and when updates are made to the service Ensure all modifications undergo peer validation before being merged Push all approved code changes to the main project branch Design, execute, and pass feature-level and external API tests as appropriate Revise API documentation in alignment with More ❯