full stack ruby engineer jobs in London

Unibuddy is seeking a mid-level software engineer to work across the full stack on the Unibuddy platform, including web, native, and backend components. You will contribute to Chat, Assistant, and Intelligence products to help students and universities engage effectively.You will work with a modern stack (NestJS, Typescript, Python, GraphQL, MongoDB, AWS)...

Ryan is seeking an early-career Full Stack AI Engineer to build AI-enabled full-stack software. You will join a cross-functional team, shaping problems into practical AI-driven solutions and delivering value through reliable code.Ideal candidates have strong software fundamentals, rapid learning, and the ability to explain design decisions. You will work in...

A leading HealthTech company in London seeks a Senior Full Stack Engineer to develop scalable, cloud-native products. The ideal candidate has over 5 years of experience with React, Typescript, Node.js, and AWS, working in data-sensitive environments. The role involves mentoring engineers and ensuring high engineering standards. Offers a salary up to £90k...

The Gym Group is seeking a Lead Full-Stack Developer to drive architecture and delivery across React/Next.js and .NET Core in a hybrid setup based in London. You will mentor engineers, shape technical direction, and collaborate with product, design, architecture, and partners to deliver high-quality digital experiences.You will design and govern AI-assisted...

Octopus Energy Group is seeking a Senior Fullstack Software Engineer (Python and React) to join our product and engineering team, building the systems that power our electric car leasing platform. Our tech stack includes Python with GraphQL, React with Next.js, PostgreSQL and NoSQL, deployed on AWS.You will work within a cross-functional team, build APIs,...

Sphere is seeking a Senior Full Stack Engineer to own and build out new product lines (input tax, withholding tax, e-invoicing, tariffs) and critical platform components. You will contribute to scaling the AI-native compliance platform and drive ARR growth with end-to-end ownership.You will ship mission-critical features, manage a dedicated component, and...

Preply is hiring a Senior II Full Stack Engineer to drive backend systems in Python/Django and frontend in React/Typescript. You will lead complex initiatives, mentor engineers, and partner with product, data, and UX to deliver measurable impact at scale.This is a remote, internationally oriented role with opportunities across 175 countries. You’ll...

Pearson Carter is seeking a skilled Full Stack Developer to join a global retailer's web team. You will work on Next.js applications, delivering robust features with React and TypeScript, in a remote-capable setup from London.The role emphasizes collaboration on modern frontend/backend tasks and writing clean, scalable code. The client offers...

A technology company based in the United Kingdom is seeking a talented Full Stack Software Engineer to build cutting-edge software solutions. This role involves developing and optimizing APIs, creating responsive frontends, and maintaining databases. The ideal candidate will have proven experience in API development and database management, along with a...

Full Stack Engineer - React/ Typescript - Python (VP) Engineer the future of global finance. At Citi, our Tech team doesn't just support finance - we are helping to redefine it. Every day, $5 trillion crosses through our network. We do business in 180+ countries operating at a scale few can match. From deploying advanced AI to helping shape global markets,...

Elsevier is seeking a software engineer to design, develop, test, and deploy cloud-hosted web applications. You will collaborate with an Agile cross-functional team to turn complex requirements into user-focused solutions and continuously improve engineering practices.The role emphasizes modern tech like Java, JavaScript/TypeScript, React/Angular, and TDD...

Cedar Technology is recruiting an AI Full Stack Engineer to help an investment organisation undergo an ambitious AI transformation. You will join a small, influential AI team and work directly with senior stakeholders to design, develop and deploy intelligent applications across the business.You’ll own the end-to-end AI engineering lifecycle, building...

Fospha is hiring a junior software engineer in London to work across the full stack, from Frontend UI in React/Next.js to backend services in Python. You’ll collaborate with engineers, product managers and AI agents in our AI-first operating model, gaining ownership of features from day one.You will contribute to code reviews, learn spec-driven...

Mondrian Alpha is seeking a Senior Full Stack Software Engineer to design, build and own business-critical applications across trading and finance platforms.You will work with C#/.NET or Java, SQL and microservice architectures, while guiding AI-driven workflows and production AI platforms. Direct collaboration with traders and finance teams will shape...

Senior Full-Stack Engineer - AI Startup (Typescript, Node, React) London - 4 days per week in the office Permanent | £120,000 - £150,000 We're working with an exciting early-stage AI startup building an agentic platform for institutional finance. The company is a small, high-performing team of fewer than 10 people, moving quickly and building towards its...

Dare, based in London, is seeking a senior Full-Stack Engineer to join the Software Engineering team. You will own features end-to-end across UI, services, and data layers, building with React on the frontend and a modern backend stack.You’ll contribute to architecture, write robust code, and support real-time analytics for trading activities. You will...

Litta is hiring a Senior Full Stack Product Engineer to build and improve operational infrastructure for waste-collection scale. You will ship end-to-end features across frontend and backend, integrate external systems like Stripe/HubSpot, and leverage AI-assisted tooling to accelerate delivery while reducing manual work.The role requires ownership across...

JPMorganChase is seeking a Software Engineer III to join the Infrastructure Platforms, Data Center Services team. You will design and deliver full-stack solutions across frontend (React) and backend (Node.js/TypeScript, Python) services, ensuring secure, high-quality production code and scalable architectures.You will mentor junior engineers, participate in...

JPMorganChase is seeking a Full Stack Software Engineer in AI Engineering within the Chief Data and Analytics Office Technology group. You will design, develop, deploy, and maintain AI products used across the firm, collaborating with software engineers, data engineers, and research scientists to deliver production-ready capabilities.You will contribute to...

A tech scale-up company in London is looking for a Senior Software Engineer. In this role, you will work on complex systems and be part of a diverse team. The position offers a competitive salary of up to £100k, 25 days of holiday, and hybrid work options. Candidates should have strong web development knowledge and a degree in a tech-related field. The...