full stack javascript engineer jobs in London

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...

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...

C# Full Stack Software Engineer – Fintech85,000 Plus 10% BonusRemote Working 2 days per month in the officeQuant Capital is urgently looking for C# Full Stack Developer to join our high profile client.My Client is a well known global (yet not too corporate) financial software (fintech) business that has developed a unique proprietary front office lending...

EFG (ESL FACEIT Group) in the United Kingdom is seeking a seasoned Full Stack Developer to join the Publisher Operations team. You will build tooling to support events and programmes for partners, collaborating with operations, competition, and production to scale multi-title esports events.You will own features end-to-end, develop with React/Next.js and...

UNiDAYS is seeking a hands-on Software Engineer (TypeScript) to build innovative solutions that delight our members and drive product success in a fast-paced company. You will bridge user needs and business goals while delivering resilient, scalable code.You will work across product, delivery and engineering teams to define, refine, build, and measure the...

E-Frontiers in London is seeking a Java Full Stack Software Engineer with UK SC clearance for a 12-month hybrid contract. You will design, develop and lead full-stack solutions using Java, Spring Boot, Angular/React, and AWS, working within Agile teams to deliver impactful public-safety software.Join a collaborative team, mentor peers, and help shape...

Dex is seeking a founding-team capable full-stack engineer to build a platform that answers security questions once, with Python on the backend and React on the frontend. You will own the data model and UI, and work directly with the founder and customers to ship value.You will tackle evolving, complex problems across large environments, delivering...

Senior Full Stack Developer – Teesside / Hybrid £55,000 - £65,000 + excellent benefitsAre you an experienced Senior Developer with proven expertise with Python / Django? This is an opportunity to join a growing SaaS company that is establishing its UK presence by bringing in an experienced Senior Full Stack Developer.You will have significant sway over...

Full Stack Python DeveloperSalary: 60,000 to 80,000Location: West LondonWorking arrangement: Predominantly office and customer-site based, with some remote working availableEmployment: Permanent, full-timeMFK Recruitment is recruiting a Full Stack Python Developer for an innovative UK technology company developing advanced Artificial Intelligence and Machine...

CoinDesk is seeking a Senior Full-Stack Engineer to join the Media Engineering team. You will own complex features across web, mobile apps, and services, with a focus on performance, reliability, and security.You will work with Next.js, React, Node.js, and TypeScript, applying automated testing and DevSecOps principles. Experience with AI tooling and...

Addition is a growing technology consultancy delivering AI and ML solutions to UK government clients. You will lead and craft scalable software across front-end, back-end and data layers, combining hands-on engineering with technical leadership.Expect meaningful impact, modern tech and a supportive team. Hybrid role with one in-office day per week in...

Job DescriptionThe information below covers the role requirements, expected candidate experience, and accompanying qualifications.Fantastic opportunity to join a world class Investment Management business. Send your CV for more info! We are seeking a highly experienced Senior Full Stack Engineer to contribute to the design, development and optimisation of...

Few&Far in the United Kingdom seeks a senior Full Stack Engineer with a frontend focus to build products at the intersection of healthcare, finance and AI. You will own problems from scoping to production, shipping customer-facing features using React/Next.js and Python services.The role requires strong commercial experience with Python and TypeScript, 5+...

Hopper Inc. is seeking a senior full stack engineer to anchor HTS Assist, owning realtime and voice end-to-end.You will build across React/TypeScript front ends, Scala and Python services, and cloud infra, with a focus on multi-tenant, scalable architecture and safety/compliance integration. The role emphasizes ownership, mentoring, and shaping the platform...

🚀Senior Full Stack Engineer – Java/Kotlin&React 📍London | Hybrid 🏦Tier 1 Investment Bank | Prime Finance We are partnering with a Tier 1 investment bank on a major, multi-year transformation of its Prime Finance Equities platform. The Equity Accelerator programme is re-engineering core trading and post-trade systems, replacing legacy...

Switch Tech Talent in London is hiring a Senior Full Stack Software Engineer to build AI-powered features in a fast-growing SaaS environment. The role offers hybrid working with Go and/or TypeScript, React & Next.js, and AWS cloud-native applications; you will own features end-to-end and collaborate with Product, Design and customers.Ideal candidates have...

Arrows in London is seeking top-tier engineers to build the front-end and back-end of our products at speed. You’ll join a lean, talent-dense team and help shape scalable foundations for a global market.Must-haves include expert Python, PostgreSQL mastery, full-stack capability, and clear communication. Preferred: TypeScript, React, and experience with...

Harvey Nash Group is seeking a highly experienced Senior Full Stack Engineer to design, develop and optimise front office applications in a world-class investment management environment. You will work closely with portfolio managers and product owners to deliver robust, scalable software.The role requires strong frontend and backend expertise, mentoring...