20 of 20 Front-End Engineer (Client-Side Engineer) Jobs in the Thames Valley

(React/TypeScript) Location: Remote (1 day per month in Oxford, UK) Type: Permanent | SaaS | Global Tech Company Are you passionate about building exceptional, scalable front-end applications? Our client — a leading SaaS company based near Oxford — is expanding and looking for a Senior Front-End Software Engineer … closely with UX designers and back-end developers to deliver intuitive, high-performance web applications. 🌟 What You’ll Do Develop, optimise, and maintain high-quality front-end applications using React.js and TypeScript Collaborate with cross-functional teams to bridge the gap between design and technical implementation Contribute to a culture of clean code, testing … and continuous improvement (Optionally) take on a technical lead role , mentoring others and influencing best practices ✅ What You’ll Bring 5+ years of experience building production-grade front-end software with React.js and TypeScript Strong skills in HTML5 , CSS3 , and RESTful APIs Experience with unit and integration testing Background in SaaS product development 💡 Nice-to-Have More ❯

Job Description Bits is a UK based Fintech startup backed by Y Combinator (the investor behind Stripe and Airbnb) that promotes financial inclusion. You will be joining a small engineering team (10 ppl) that are all about ownership and commitment. More ❯

🚨 Staff Frontend Developer 💰£100–120k + 20% bonus + equity 🌍(London Hybrid OR Remote options available) I've partnered with a revolutionary Fintech whose code is helping the world’s top investment teams make smarter, faster, measurably better decisions. This More ❯

Job Role: Senior Software Engineer, Frontend Job Type: Full Time, Permanent Location: London, Hybrid (3 office days a week) Role purpose As a valued member of our engineering team, you will contribute to the development of our new web application, powered by a Headless CMS, using the latest frontend technologies. Working with a modern Next.js TypeScript More ❯

however, you are not required or expected to have background in Machine Learning. This is a senior-level role, and we are looking to hire a software engineer with background in product design, UI/UX design, and with a strong sense of aesthetics. Portfolio We would love to see your recent frontend works! If possible … with a startup work environment and wider ecosystem. Why join us? Work in an environment conducting cutting-edge research in AI. An official role title of “Founding Engineer” – make an impact on day one. Competitive salary, equity and benefits package. 28 days + public holidays allowance. Opportunities for professional growth and progression with your career. Work More ❯

About the Job Senior Frontend Engineer – London (Victoria) | Hybrid £80k - £110k Are you ready to craft the next generation of data-driven digital experiences for one of Europe’s most technically advanced SaaS innovators? Our client, a pioneer in B2B SaaS solutions , is building “Your Shipping Analytics Supercomputer” , providing cutting-edge data visualisation and … technical role that blends creativity, collaboration, and engineering excellence, ideal for someone who thrives in fast-paced, high-growth environments. What You’ll Bring 5+ years of front-end development experience building large-scale web applications. Expertise in React, TypeScript/JavaScript, HTML, and CSS . A strong appreciation for UI/UX design and a … a £100m AI start-up exit , they’re focusing all their attention on this next big venture. This is an outstanding opportunity to design and deliver the front-end of a platform that’s redefining how businesses interact with data. If you’re a passionate engineer who loves solving complex problems through More ❯

Front End Engineer/Developer (TypeScript React Native AI) London/WFH to £80k Want to work on intellectually and technically challenging AI systems at the cutting edge of what is possible, whilst learning and collaborating with an amazing team and enjoying flexible working and a range of other perks? You could … Salary to £80k Bonus Pension Healthcare Work with the latest cutting-edge AI technologies Excellent training and career development opportunities Your role: As a Front End Engineer you'll design and develop new features and enhancements on the core product that uses Artificial Intelligence to harness knowledge for strategic advantage. You'll … AWS preferred) You are a bright, proactive individual and a strong problem solver with commercial acumen Apply now to find out more about this Front End Engineer/Developer (TypeScript React Native AI) role. At Client Server we believe in a diverse workplace that allows people to play to their More ❯

We’re partnering exclusively with one of the most prestigious trading firms in London to find a highly skilled Front-End Software Engineer to join their world-class engineering team. This is an opportunity to work at the very heart of high-performance trading technology — building ultra-responsive, visually intuitive web interfaces … Doing: Building high-performance, data-intensive UIs using React and TypeScript Collaborating closely with back-end engineers, traders, and product teams Designing and refining complex front-end architectures for real-time data visualization Working in a culture where engineering excellence and code quality are non-negotiable Tech Stack: Languages: TypeScript, JavaScript (ES6+) Frameworks: React … WebSockets, performance profiling, or custom charting libraries (e.g., D3.js, Highcharts) What They’re Looking For: Strong experience with React and modern JavaScript/TypeScript Deep understanding of front-end architecture, performance tuning, and scalable component design Experience in fast-paced environments (finance, trading, gaming, or top-tier tech) Passion for clean, maintainable code and UI craftsmanship More ❯

DuckDB, WebGPU) · D3/visx · Storybook · Tailwind CSS · Jest · Cypress · Playwright What You Bring 8+ years building and evolving large-scale web applications. Proven track record in front-end architecture (modular codebases, micro-frontends, design systems, scalability). Strong portfolio of data-heavy, real-time UIs and reusable component libraries. Expertise in TypeScript, CSS methodologies (Tailwind … in-JS), and modern testing frameworks. Passion for developer experience, tooling, and mentoring. Degree in Computer Science or equivalent experience. Bonus points for: Open source contributions to front-end tooling, design systems, or data-visualisation libraries. Experience with WebSockets, PWAs, offline support, or design-token pipelines. How They Work Speed with craftsmanship: Continuous delivery, short feedback … Why Apply? This is a chance to join a hyper-growth company at the forefront of AI-powered collaboration, tackling some of the most exciting challenges in front-end engineering today. Interested? Reach out to Stax for a confidential discussion. Please be advised that, owing to the expected volume of applications, we may only be able More ❯

Senior Frontend Engineer – Next.js/React Location: Monument WeWork in London Type: Full-Time About Admanage.ai We’re building the Cursor for ad management. Admanage.ai helps companies launch ads 10x faster on Meta & TikTok. Created by top performance marketers who’ve managed over $50M+ in ad spend. Our mission? Level the playing field by giving every More ❯

Senior Frontend Engineer | Up to £850/day Outside IR35 We are partnered with a well-funded, growing force in the BioTech sector. They are bringing cutting edge, fully customisable technology to critical workflows, enhancing efficiency, reducing errors and reducing workload. They are looking for a highly experienced Senior Frontend Engineer on … a contractual basis: Senior Frontend Engineer Typescript, React based Desireable: Experience with FE testing strategies, large, complex, data-intensive applications and owning best practices (delivery and user-focused) Up to £850/day (Outside IR35) - 6m+ term Hybrid - Central London This isn't an ordinary Senior Frontend Engineer role; you will be More ❯

for AI evaluation and reliability - empowering engineers and researchers to better understand and improve their agents. This role would suit someone who is a frontend developer, Founding Engineer, or a FullStack Engineer who is leaning towards the frontend. The Role As a Product Engineer focused on Frontend , you More ❯

Role: Senior Frontend Engineer (Angular) 🌍 Location: Banbury – Hybrid (2-3 days a week in office) 💰 Salary: £75,000 🛠 Key Skills: TypeScript, Angular We’re hiring on behalf of a fast-scaling SaaS company in the public safety space and while they’re focused on backend transformation, the real need is YOU: a Senior Frontend Engineer … of a critical platform. The current UI is legacy-heavy and built with a custom frontend pattern that frankly, doesn’t follow standard. As the Senior Frontend Engineer, you will get a clean slate to architect and implement a new Angular-based frontend your way, with full ownership and a strong say in UX/UI. … Senior Frontend Engineer Responsibilities: Rebuild the frontend from scratch in Angular Define structure, standards, and design direction Own all frontend and UX decisions Collaborate with backend engineers (you'll lead frontend solo) Senior Frontend Engineer Requirements: Senior Angular + TypeScript experience Strong UX sensibility Proven ability to lead greenfield/frontend rebuilds More ❯

Role: Senior Frontend Engineer (Angular) 🌍 Location: Banbury – Hybrid (2-3 days a week in office) 💰 Salary: £75,000 🛠 Key Skills: TypeScript, Angular We’re hiring on behalf of a fast-scaling SaaS company in the public safety space and while they’re focused on backend transformation, the real need is YOU: a Senior Frontend Engineer … of a critical platform. The current UI is legacy-heavy and built with a custom frontend pattern that frankly, doesn’t follow standard. As the Senior Frontend Engineer, you will get a clean slate to architect and implement a new Angular-based frontend your way, with full ownership and a strong say in UX/UI. … Senior Frontend Engineer Responsibilities: Rebuild the frontend from scratch in Angular Define structure, standards, and design direction Own all frontend and UX decisions Collaborate with backend engineers (you'll lead frontend solo) Senior Frontend Engineer Requirements: Senior Angular + TypeScript experience Strong UX sensibility Proven ability to lead greenfield/frontend rebuilds More ❯

UCL, Innovate UK, Microsoft, and Google, we're becoming the go-to AI education platform for all major exams worldwide. The Role We're seeking a talented Front-End Developer who will help us craft beautiful, engaging user experiences that rival the best consumer apps, while helping us pioneer the future of AI-powered education interfaces. More ❯

Front End Engineer (Product focus for AI) - Perm £115 - £130K basic + equity Central London (On-Site, 5 Days a Week) £115 - £130K basic + meaningul equity Backed by the biggest name in AI Investment $6M of recent funding Very quick feedback and process! About the Company An AI company on a … to power the next wave of innovation. Our culture values hands-on collaboration, experimentation, and fast iteration. About the Position We’re hiring a Front End Engineer who’s excited about blending solid product engineering with applied AI research. You’ll work closely with product and research teams to design, prototype, and … and ambitious goals. Curious, resourceful, and eager to learn about emerging AI technologies. Bonus: experience with large language models, AI frameworks, or prompt engineering. Front End Engineer (Product focus for AI) - Perm £115 - £130K basic + equity More ❯

Senior Frontend Engineer (React.js) | Brand New Energy Trading Desk | £130,000 + Bonus + Benefits | London Hybrid I am looking for a Senior Frontend Engineer with React focus for a Trading House that build cross asset trading systems. The FinTech are building from the ground up and currently expanding their team to … completely greenfield build, payments platform. As a Senior Frontend, your role will be to come in and assess the current build, working very closely with the lead Engineer to redesign parts of the system and lead from the front in terms of the build. Responsible for developing new features for the public website and … bonus + benefits 📍Located in London City, St Paul's, with 3 days per week from the office 🧑React.Js, React Hooks, TypeScript Responsibilities of the Senior Frontend Engineer (React.js): Designing, coding, and testing all components of modern web applications. Contribute to the overall architecture and design of the technology created/maintained by the delivery team. More ❯

our inventory. We provide the tools which help our customer services team provide world class service to travellers and operators internationally. We're looking for a Software Engineer I - Frontend Focus to join our fast-growing team. This role is open to candidates based in Oxford or London in the UK. We embrace flexibility in where More ❯

Role: Staff Front End Engineer Location: Hybrid - 2-3 days in London Office Compensation: Up to £170,000 + equity We’re working with a frontier AI-driven biology lab on a mission to redefine how science is done. Their research and engineering teams are building next-generation tools that help scientists … visualise, understand, and design biology at an unprecedented scale. As a Front End Engineer , you’ll craft the visual layer of this transformation, designing interfaces that turn vast, complex biological data into intuitive, beautiful experiences. Your work will sit at the intersection of AI, design, and discovery , directly accelerating breakthroughs in life More ❯

BettingJobs are working with an AI-powered B2B marketing company based in London . They are looking for a Frontend Engineer to join their team. Responsibilities: Manage the company’s frontend portal, where users interact with the system. Collaborate with a designer, product manager, and engineering team to: Continuously improve the user experience. Add new features. More ❯