full stack ruby engineer jobs in London

Generative Group is seeking a Full Stack Engineer to build AI-led capital markets software with a strong backend focus.You will design and develop backend services with Python, FastAPI and SQLAlchemy, deploy on AWS, and collaborate across a small, fast-moving team. Frontend work with React optional as needed, and strong problem-solving and communication are...

NatWest Group is seeking a Software Engineer, Full Stack to join a permanent feature team building our real-time banking platform. You will design, test and implement software across the lifecycle, collaborating with senior engineers and architects to align with business objectives.You will apply Agile methods, deliver scalable and maintainable systems, and...

Harrington Starr in London is partnering with a leading investment management technology firm to hire a Full-Stack Developer. This hands-on role works closely with front-office users to develop, support and enhance a business-critical investment platform.You will build features across the full stack, diagnose production issues, deliver enhancements, monitor...

Broadridge is seeking a Senior Developer to join the AI Enablement Team in London. The role focuses on implementing and designing GenAI-enabled solutions across the organization, contributing to platform capabilities and cutting-edge AI projects.You will lead development, technical guidance, code reviews, testing, and cross-functional collaboration to...

Lyst is a global fashion shopping platform founded in London in 2010 and catering to over 160M shoppers per year. We offer our customers the largest assortment of premium and luxury fashion products in one place, curating pieces from 27,000 of the world's leading brands and stores. In 2025, Lyst joined Zozo, operators of Zozotown, the leading fashion...

Full-Stack Engineer * Kings cross, London * £85,000–£105,000 * 5x Positions We're hiring Full-Stack Engineers to build Descrial end to end, from the database to the interface. Our clients trust us with confidential financial data, so security, tenant isolation, auditability and a polished experience are engineering constraints, not...

Referment is building an AI-enabled engineering organization in London. The role involves owning features end-to-end across the full SDLC, from rough briefs to production, using Ruby, Node and Go with frontend work in modern frameworks.You’ll embed AI tooling into design, review, and QA, and help shape how AI assists a large monolith in a regulated...

Cohere, a security-first enterprise AI company, is hiring for roles focused on North, its AI workspace platform. You will build and ship features, develop autonomous agents that interact with sensitive data, and write minimal code that runs securely in low-resource environments.Collaborating with researchers to productionize state-of-the-art models, you’ll...

Capgemini Invent in the UK is seeking a C#/.NET Full Stack Engineer to help design cutting-edge digital solutions. You will work across ASP.NET Core, C#, SQL Server, RESTful APIs and microservices, balancing business value with a consultative approach in multi-disciplinary teams.The role sits in Digital Excellence within Business Technology, offering hybrid...

Fortice Ltd in London is seeking a skilled Full Stack Software Engineer to work on Java/Spring back-end and React front-end solutions for UK Government and Public Sector clients. You will join a customer-facing consultancy, collaborating directly with stakeholders to understand problems and deliver robust, secure software.The role is hybrid (3 days onsite, 2...

Sharp End Partnership, Ltd. is hiring a mid-level Full-Stack Developer to join the studio’s engineering team. You’ll split time between frontend and backend work, turning high-fidelity concepts into real products across web and mobile platforms. You’ll ensure quality, maintainability, and design alignment as projects scale.You’ll build features,...

Full Stack Developer – Equities Trading TechnologyAbout MillenniumMillennium is a global, diversified alternative investment firm, founded in 1989. Defined by evolution, innovation and focus, Millennium’s mission is to deliver results for our investors.Our people are empowered with both independence and support: the autonomy to pursue ideas with...

Full Stack Developer – Treasury TechnologyAbout MillenniumMillennium is a global, diversified alternative investment firm, founded in 1989. Defined by evolution, innovation and focus, Millennium’s mission is to deliver results for our investors.Our people are empowered with both independence and support: the autonomy to pursue ideas with conviction and...

About this RoleWe are looking for a highly skilled Senior Associate Full Stack Developer who will contribute to the design, development, and maintenance of scalable, high-performance web applications across both frontend and backend layers. The role requires strong hands-on expertise in React.js, Node.js, and modern web technologies, with the ability to lead...

A leading global financial services firm is seeking a Senior Vice President, Full-Stack Engineer to lead high-impact teams in London. This role involves end-to-end delivery of mission-critical software, elevating engineering standards, and collaborating closely with product and business stakeholders. Ideal candidates should have proven leadership of...

A tech-driven company in London is looking for a Full-Stack Engineer to help build a new platform focused on AI agent costs and margins. You will have full technical ownership of the architecture while collaborating with experienced founders. Ideal candidates should have 3+ years of experience in backend systems, be fluent in Python or TypeScript, and have a...

Select how often (in days) to receive an alert: Senior Software Engineer, Full-Stack Applications - Ratings Technology (London) Requisition ID: 50676 Business Unit: Fitch Group Category: Information Technology Location: London, GB Date Posted: Sep 18, 2026 As one of the world’s top three credit ratings agencies, Fitch Ratings plays a critical role in...

Harnham in London is hiring for an AI-first backend role, blending Java or Kotlin on the Spring stack with modern AI-powered workflows. The role involves contributing across the full stack and collaborating in agile squads to deliver high-quality products.You will use Claude and N8N to automate workflows, work with APIs, CI/CD, AWS, Docker and Kubernetes,...

Lindus, a London-based health tech startup, is hiring a software engineer to help power the next generation of clinical trials. Join a fast-moving team in an onsite role with a flexible hybrid arrangement near London Bridge, and contribute to a platform that manages complex trials and brings new treatments to patients faster.You’ll work across frontend,...

About the TeamThe Intelligence & Investigations Engineering team builds systems that detect, analyze, and disrupt abuse across OpenAI’s products. We partner closely with the Child Safety team and cross-functional groups to protect users while advancing OpenAI’s goal of developing AI that benefits everyone.About the RoleAs a Fullstack Engineer focused on...