on the market. Having received huge investment, they are on a journey to truly disrupt the industry and are not held back by any legacycode or old customers. This means that they're able to build out state-of-the-art, Greenfield code which can focus More ❯
seeking a highly experienced Senior Java Lead Developer to modernize our core financial accounting systems. You will play a critical role in rewriting our legacy sub-ledger application to a modern Java-based architecture. This involves analyzing existing code, designing equivalent Java components, and ensuring a seamless transition … implementation Analyze existing modules and shell scripts to design equivalent Java components Develop and implement high-performance, scalable, and secure Java applications to replace legacycode Write clean, well-documented, and testable Java code Collaborate with architects and other developers to define the migration strategy and ensure … Sybase ASE and MS SQL, to adapt existing database schemas and queries to the new Java architecture Thoroughly test and validate the migrated Java code to ensure functional equivalence with the legacy system Troubleshoot and resolve technical issues during the migration process Participate in code reviews and More ❯
on the market. Having received huge investment, they are on a journey to truly disrupt the industry and are not held back by any legacycode or old customers. This means that they're able to build out state-of-the-art, Greenfield code which can focus More ❯
on the market. Having received huge investment, they are on a journey to truly disrupt the industry and are not held back by any legacycode or old customers. This means that they're able to build out state-of-the-art, Greenfield code which can focus More ❯
on the market. Having received huge investment, they are on a journey to truly disrupt the industry and are not held back by any legacycode or old customers. This means that they're able to build out state-of-the-art, Greenfield code which can focus More ❯
on the market. Having received huge investment, they are on a journey to truly disrupt the industry and are not held back by any legacycode or old customers. This means that they're able to build out state-of-the-art, Greenfield code which can focus More ❯
on the market. Having received huge investment, they are on a journey to truly disrupt the industry and are not held back by any legacycode or old customers. This means that they're able to build out state-of-the-art, Greenfield code which can focus More ❯
in from the start, while championing best practices and modern QA approaches. We're a fast-moving TransitTech business with plenty of exciting challenges-legacycode, evolving architecture, and new features that need rigorous testing across web, iOS, and Android platforms. If you thrive in an environment where More ❯
applications. Proficiency in constructing and managing services, including establishing standard APIs, integrating monitoring and alerting services, and expert integration with external systems. Comfort with legacycode, allowing you to maintain it and propose improvements once familiar with our workflows to help reduce technical debt. A strong commitment to … quality, expecting your code to be testable and well-covered with unit and integration tests. Familiarity with CI Jenkins pipelines and Terraform for the deployment of services and infrastructure is a plus. Demonstrated leadership experience in guiding engineering teams through high-impact projects, fostering a collaborative and innovative team 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 ❯
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 ❯
london, south east england, united kingdom Hybrid / WFH Options
Cipher7
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 ❯
systems with a constant focus on testing, reliability, scalability, and maintainability. Designing, modeling, and programming in a variety of languages and technologies. Working on legacycode as well as green field development. Initiative driving projects to completion. Learning and promoting new technologies with a focus on best practices. 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 ❯
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 ❯
systems with a constant focus on testing, reliability, scalability, and maintainability. Designing, modeling, and programming in a variety of languages and technologies. Working on legacycode as well as green field development. Initiative driving projects to completion. Learning and promoting new technologies with a focus on best practices. 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 ❯
making changes customers can see from day one. Some key projects on our roadmap this year include migrating key sections of our app from legacycode to Laravel and React, and working with our data team to integrate machine learning models into our data pipeline and front end. … a large number of documents from the web, index them, and allow users to search them through the web app. The majority of our code is written in PHP, but some parts of the data pipeline are written in Python, which is what we use for our data science More ❯
of must-have tech requirements below! What you'll do: Stay hands-on: Dedicate at least 50% of your time to technical tasks, including code and design reviews, technical kick-offs, legacycode exploration, proof-of-concept development, and incident response. Lead by example: Set the technical … experience in auditing teams codebases, aiming to maintain high standards for security, testability, and to make changes easily; coupled with the ability to make code design decisions for all teams' products. Ability to lead and/or facilitate discussions on application design, and implementation for scaling products to 10x 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 legacycode 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 ❯
london, south east england, united kingdom Hybrid / WFH Options
Fruition Group
driven team at the forefront of digital innovation – building high-impact web applications used by thousands of users daily. This isn’t about maintaining legacycode 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 legacycode, 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 ❯
Stack Java Developer to join their highly skilled tech team. You'll be instrumental in building a brand-new trading platform from scratch, no legacycode, 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 legacycode and technical debt. You’ll have the freedom to choose the best technology for the job, allowing you to innovate and deliver 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 legacycode and technical debt. You’ll have the freedom to choose the best technology for the job, allowing you to innovate and deliver More ❯
