24 of 24 Permanent Front-End Developer (Client-Side Developer) Jobs in London

Front-End Developer Hybrid London (2 days a week) Up to £75,000 + Benefits Are you passionate about building interactive, user-friendly web applications that make a real impact? We're partnering with a cutting-edge tech company combining distributed computing, simulation, and machine learning to revolutionise urban transport systems - and … they're looking for a Front-End Developer to help take their platform to the next level. Why this role? Be part of a mission-driven team improving the way cities move and operate. Work on FlowOS , a flagship product already being adopted by some of Europe's biggest public transport operators. … with balance to work remotely. Join a diverse, ambitious team of engineers, data scientists, and urban modelling experts. What you'll be doing: Designing, implementing, and testing front-end applications for FlowOS. Contributing across the full development lifecycle: from feature conception to release and customer testing. Choosing the right tools and influencing the long-term strategy More ❯

you'll be doing: Building responsive, high-quality web applications and user interfaces using HTML, CSS and JavaScript Translating design mock-ups and wireframes into accessible, functional front-end features Collaborating with back-end teams to ensure seamless integration of APIs and data services Testing, debugging and maintaining code to ensure usability across devices … and browsers Staying current with front-end development tools, trends and frameworks Participating in code reviews and contributing to continuous improvement within the team Supporting the adoption of new digital capabilities across Defence environments Working in a fast-paced, agile team to solve real-world user challenges What we're looking for: UK Developed Vetting (DV … clearance is essential Experience as a Front-End Developer with a strong portfolio of front-end applications Proficiency in HTML, CSS and JavaScript, including modern frameworks such as React, Angular or Vue.js Understanding of responsive design and cross-browser compatibility Familiarity with version control (Git) and front More ❯

The Role An opportunity for a Frontend Engineer with strong Next.js experience to join a fast-growing fintech business delivering several greenfield product builds. You'll play a key part in shaping new customer-facing and internal platforms - building intuitive More ❯

Provide are seeking a Mid-Senior Front-End Developer to join our clients' dynamic engineering team, building user-centric web applications that scale to thousands of customers. You will work primarily with React , TypeScript, and modern front-end technologies to deliver responsive, performant, and accessible interfaces. Collaborating closely … with designers, backend engineers, and product managers, you’ll turn complex requirements into intuitive, polished user experiences. As a senior contributor, you will influence the front-end architecture, enforce best practices, and ensure high code quality across the team. The ideal candidate has professional experience with React, TypeScript, and modern JavaScript frameworks , along with a strong … understanding of component-based architecture, state management (e.g., Redux, Zustand, or Recoil), and front-end performance optimization. Experience with RESTful APIs, GraphQL, and testing frameworks (Jest, React Testing Library, Cypress) is highly desirable. You should be comfortable mentoring junior engineers, conducting code reviews, and helping the team adopt scalable, maintainable practices. This role offers an exciting More ❯

Provide are seeking a Mid-Senior Front-End Developer to join our clients' dynamic engineering team, building user-centric web applications that scale to thousands of customers. You will work primarily with React , TypeScript, and modern front-end technologies to deliver responsive, performant, and accessible interfaces. Collaborating closely … with designers, backend engineers, and product managers, you’ll turn complex requirements into intuitive, polished user experiences. As a senior contributor, you will influence the front-end architecture, enforce best practices, and ensure high code quality across the team. The ideal candidate has professional experience with React, TypeScript, and modern JavaScript frameworks , along with a strong … understanding of component-based architecture, state management (e.g., Redux, Zustand, or Recoil), and front-end performance optimization. Experience with RESTful APIs, GraphQL, and testing frameworks (Jest, React Testing Library, Cypress) is highly desirable. You should be comfortable mentoring junior engineers, conducting code reviews, and helping the team adopt scalable, maintainable practices. This role offers an exciting More ❯

Front End Developer/Engineer (TypeScript React Native AI) London/WFH to £65k 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 … be progressing your career as a Front End Developer at a well-established AI company acting as tech incubator within the World Economic Forum to tackle issues like climate change, AI, battery technology and other real world problems. As a Front End Developer you … AWS preferred) You are a bright, proactive individual and a strong problem solver with commercial acumen What's in it for you: As a Front End Developer/Engineer, you will earn a competitive package including: Salary to £65k Bonus Pension Healthcare Work with the latest cutting-edge AI technologies Excellent training More ❯

Front End Developer/Engineer (TypeScript React Native AI) London/WFH to £65k 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 … be progressing your career as a Front End Developer at a well-established AI company acting as tech incubator within the World Economic Forum to tackle issues like climate change, AI, battery technology and other real world problems. As a Front End Developer you … AWS preferred) You are a bright, proactive individual and a strong problem solver with commercial acumen What's in it for you: As a Front End Developer/Engineer, you will earn a competitive package including: Salary to £65k Bonus Pension Healthcare Work with the latest cutting-edge AI technologies Excellent training More ❯

Senior Frontend Developer (React) - Series A GenAI Security Scale-up Salary: £120,000 - £135,000 (DOE) + equity + benefits Hybrid: 2 days/week in Central London office (Kings Cross/Covent Garden area) A Series A, high-growth cybersecurity scale-up (~40 employees) is looking for a Senior React Engineer to join their mission … of helping companies adopt Generative AI safely and securely. They are building a developer-first platform that enables data protection without complexity - redefining security for the GenAI era. This is a rare chance to join at a pivotal time as they scale their infrastructure across regions, including a full US AWS deployment. You'll be joining More ❯

It also means committing to excellence, learning, and delivering great products to our customers in a high-velocity startup. The role We’re looking for a talented Front-End Engineer to drive the development of our high-performance AI video security platform. In this role, you will own a significant part of the front … skills. Experience with React Query, Storybook, and Material UI (or similar). Proven ability to optimize performance and build interactive, user-friendly applications. Experience leading large-scale front-end projects and setting best practices. Familiarity with backend/cloud technologies (AWS, Python, databases). Self-driven with a high level of intrinsic motivation to succeed and More ❯

It also means committing to excellence, learning, and delivering great products to our customers in a high-velocity startup. The role We’re looking for a talented Front-End Engineer to drive the development of our high-performance AI video security platform. In this role, you will own a significant part of the front … skills. Experience with React Query, Storybook, and Material UI (or similar). Proven ability to optimize performance and build interactive, user-friendly applications. Experience leading large-scale front-end projects and setting best practices. Familiarity with backend/cloud technologies (AWS, Python, databases). Self-driven with a high level of intrinsic motivation to succeed and More ❯

It also means committing to excellence, learning, and delivering great products to our customers in a high-velocity startup. The role We’re looking for a talented Front-End Engineer to drive the development of our high-performance AI video security platform. In this role, you will own a significant part of the front … skills. Experience with React Query, Storybook, and Material UI (or similar). Proven ability to optimize performance and build interactive, user-friendly applications. Experience leading large-scale front-end projects and setting best practices. Familiarity with backend/cloud technologies (AWS, Python, databases). Self-driven with a high level of intrinsic motivation to succeed and More ❯

It also means committing to excellence, learning, and delivering great products to our customers in a high-velocity startup. The role We’re looking for a talented Front-End Engineer to drive the development of our high-performance AI video security platform. In this role, you will own a significant part of the front … skills. Experience with React Query, Storybook, and Material UI (or similar). Proven ability to optimize performance and build interactive, user-friendly applications. Experience leading large-scale front-end projects and setting best practices. Familiarity with backend/cloud technologies (AWS, Python, databases). Self-driven with a high level of intrinsic motivation to succeed and More ❯

Front End React Developer, React, Javascript, NW London to £80K A leading financial software company are looking for a Front End JavaScript developer who is proficient with React.js. The role is Offcie based in North West London, Your primary focus will be on developing … infrastructure. Therefore, a commitment to collaborative problem solving, sophisticated design, and quality product is important. Responsibilities Developing new user-facing features using React.js Building reusable components and front-end libraries for future use Translating designs and wireframes into high quality code Optimising components for maximum performance across a vast array of web-capable devices and browsers … principles Experience with Redux and RTK (RTKQuery also a bonus) Familiarity with RESTful APIs Knowledge of modern authorization mechanisms, such as JSON Web Token Familiarity with modern front-end build pipelines and tools (Github actions a bonus) Experience with common front-end development tools such as Babel, Webpack, NPM, etc. Ability to More ❯

limited hiring capabilities. About the Opportunity We are building Version 2 of SkilledUp Life after operating our Minimum Viable Product for 4 years. Our tech stack includes: Front-end: Vue.js Database: MariaDB Hosting environment: AWS EC2 + S3 We are looking for front-end developers. The product team is led by an More ❯

Senior Engineer/Frontend Engineer/Frontend Developer/React/Typescript/ELM/AI Senior Frontend developer - AI Startup (London, Hybrid) Location: London (Hybrid - 2x per week in office) Experience: 3-6 years Package: 80-150k + equity Tech: React, Typescript, JavaScript, ELM Tiro Partners is representing an exciting … with world-class engineers and ML researchers. Hybrid model - 2x a week in our London office. Competitive salary + equity. Senior Engineer/Frontend Engineer/Frontend Developer/React/Typescript/ELM/AI More ❯

Senior Engineer/Frontend Engineer/Frontend Developer/React/Typescript/ELM/AI Senior Frontend developer - AI Startup (London, Hybrid) Location: London (Hybrid - 2x per week in office) Experience: 3-6 years Package: 80-150k + equity Tech: React, Typescript, JavaScript, ELM Tiro Partners is representing an exciting … with world-class engineers and ML researchers. Hybrid model - 2x a week in our London office. Competitive salary + equity. Senior Engineer/Frontend Engineer/Frontend Developer/React/Typescript/ELM/AI More ❯

Senior Full-Stack Web Applications Developer (80% Front End/20% Back End) Location: Temple, London (Hybrid - 3 days per week in office) Contract: 1-year fixed term Salary: Up to £75,000 + bonus | Start: Immediate/Oct-Nov latest We're seeking a Senior Full-Stack Web Applications … Developer to join a world-leading think tank driving a major digital transformation programme . This role is Front End focused (around 80%), with the Back End largely complete - you'll help refine, debug, and enhance an MVP platform already in production. You'll work with Next.js , Node.js , and SQL More ❯

Frontend Developer (Node.js/Fastify/Typescript) Outside IR35 | £400 ~ | Remote first | 3 months | Start ASAP Overview SR2 is looking for a skilled Frontend Developer with strong Node.js, Fastify and Typescript experience to join a digital programme for a government department. This role is about building user-facing web applications, ensuring high More ❯

Frontend Developer (Node.js/Fastify/Typescript) Outside IR35 | £400 ~ | Remote first | 3 months | Start ASAP Overview SR2 is looking for a skilled Frontend Developer with strong Node.js, Fastify and Typescript experience to join a digital programme for a government department. This role is about building user-facing web applications, ensuring high More ❯

We're Hiring a Frontend Developer | Earn up to $5000/month Location : (Remote, United States) What You Will Be Doing Contribute expertise to train and refine AI systems by producing high-quality written data. Adopt a user-centric mindset to create natural content that reflects real-world use cases. Evaluate AI-generated outputs by reviewing More ❯

We're Hiring a Frontend Developer | Earn up to $5000/month Location : (Remote, United States) What You Will Be Doing Contribute expertise to train and refine AI systems by producing high-quality written data. Adopt a user-centric mindset to create natural content that reflects real-world use cases. Evaluate AI-generated outputs by reviewing More ❯

We're Hiring a Frontend Developer | Earn up to $5000/month Location : (Remote, United States) What You Will Be Doing Contribute expertise to train and refine AI systems by producing high-quality written data. Adopt a user-centric mindset to create natural content that reflects real-world use cases. Evaluate AI-generated outputs by reviewing More ❯

We're Hiring a Frontend Developer | Earn up to $5000/month Location : (Remote, United States) What You Will Be Doing Contribute expertise to train and refine AI systems by producing high-quality written data. Adopt a user-centric mindset to create natural content that reflects real-world use cases. Evaluate AI-generated outputs by reviewing More ❯

We're Hiring a Frontend Developer | Earn up to $5000/month Location : (Remote, United States) What You Will Be Doing Contribute expertise to train and refine AI systems by producing high-quality written data. Adopt a user-centric mindset to create natural content that reflects real-world use cases. Evaluate AI-generated outputs by reviewing More ❯