1 to 25 of 36 Front-End Developer (Client-Side Developer) Jobs in the City of London

Senior Frontend Engineer – Scaling Start-Up – Up to £130,000 + Equity 🚀 💰Up to £130,000 plus equity 🏡Hybrid working – London based 💻React.js & TypeScript We’re partnered with a scaling Start-Up who have recently raised significant investment and are More ❯

Synechron is looking for an experienced UI Developer to join one of our largest accounts for a global financial institution. This is a permanent or long term contract (inside IR35) role, with hybrid working (x3 days a week) joining an established team. Role: Design new application portal for configuration, monitor dashboards and client online More ❯

Synechron is looking for an experienced UI Developer to join one of our largest accounts for a global financial institution. This is a permanent or long term contract (inside IR35) role, with hybrid working (x3 days a week) joining an established team. Role: Design new application portal for configuration, monitor dashboards and client online More ❯

Product Engineer - React & TypeScript, some Python - AI video editing🎬 - £90-110k We're helping a AI company in the entertainment space hire a front end leaning fullstack engineer. You'll be working with a talented More ❯

Product Engineer - React & TypeScript, some Python - AI video editing🎬 - £90-110k We're helping a AI company in the entertainment space hire a front end leaning fullstack engineer. You'll be working with a talented More ❯

I am currently working with leading digital agency in Central London who are looking for an experienced Typescript Engineer to join their growing team! The company work with a wide variety of FTSE clients across different industries, focusing on creating More ❯

I am currently working with leading digital agency in Central London who are looking for an experienced Typescript Engineer to join their growing team! The company work with a wide variety of FTSE clients across different industries, focusing on creating 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 ❯

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 ❯

Are you an experienced Frontend Developer looking for a new challenge and to work for an AI startup with an important mission? 🚀 Senior Frontend Developer – AI Data Security 🚀 Location : Hybrid working 1-3 days a week in central London (King’s Cross) Salary : up to £140,000 + bonus + equity We … exciting time to join the team as they are growing across multiple areas of the business, having just secured over £17mil in funding. As a Senior Frontend Developer, you will: Have 6+ years experience as a Frontend Software Engineer Experience developing with: React, Typescript, HTML, CSS A desire to be part of an important mission Be … illness cover If you enjoy a flexible culture with the ability to work from home a few days a week, apply now for this unmissable Senior Frontend Developer opportunity now! Please note : Due to compliancy reasons, we will only be able to consider applications based in and eligible to work in the UK. More ❯

Senior Frontend Developer Up to £80,000 Central London - Flexible Hybrid Options Health-Tech A start-up within the health space are seeking a Senior Frontend Developer to join a high performing squad of engineers building a unique SAAS platform which is radically streamlining an existing complex process. You'd join as … a Senior Frontend Developer and make a real impact on user facing features from the off while enhancing frontend architecture in order to accelerate the products ground-breaking advancements. As a Senior Frontend Developer, you will have the following: Strong expertise in React & Typescript - ideally also with Next.js Strong UI/UX … social impact and grow with the company This is an exciting opportunity to work on impactful projects in a forward-thinking environment. If you are passionate about front-end development, we’d love to hear from you More ❯

Senior Frontend Developer Up to £80,000 Central London - Flexible Hybrid Options Health-Tech A start-up within the health space are seeking a Senior Frontend Developer to join a high performing squad of engineers building a unique SAAS platform which is radically streamlining an existing complex process. You'd join as … a Senior Frontend Developer and make a real impact on user facing features from the off while enhancing frontend architecture in order to accelerate the products ground-breaking advancements. As a Senior Frontend Developer, you will have the following: Strong expertise in React & Typescript - ideally also with Next.js Strong UI/UX … social impact and grow with the company This is an exciting opportunity to work on impactful projects in a forward-thinking environment. If you are passionate about front-end development, we’d love to hear from you More ❯

Front End Developer 4 days a week in Central London Front End Developer - £80,000 - £100,000 Front End Developer - would you like the opportunity to work with one of the leading SasS company with a … advantageous Ideally have worked within a SaaS environment Benefits Annual bonus scheme Flexible working times 26 days holiday 5% Pension Health care As a Front End Developer, this is a unique opportunity to join a market leading company with the added bonus of continuing to grow your skillset, with an outstanding benefits More ❯

plus bonus Harrington Starr has partnered up with a Global Investment Bank in the City of London who are looking to hire a Senior UI Trading Software Developer to work in a Front Office environment with Traders, Quants and Portfolio Managers within a Front Office Trading Floor. This is a high profile … role for a Multi Asset Trading Team within a Front Office environment. As the Senior Trading UI Developer, you will have extensive experience of working with the JavaScript Framework including ES7 and HTML and CSS. You will be working directly with Portfolio Managers, Sales Traders and Quants and end users where you More ❯

plus bonus Harrington Starr has partnered up with a Global Investment Bank in the City of London who are looking to hire a Senior UI Trading Software Developer to work in a Front Office environment with Traders, Quants and Portfolio Managers within a Front Office Trading Floor. This is a high profile … role for a Multi Asset Trading Team within a Front Office environment. As the Senior Trading UI Developer, you will have extensive experience of working with the JavaScript Framework including ES7 and HTML and CSS. You will be working directly with Portfolio Managers, Sales Traders and Quants and end users where you More ❯

Front-End Engineer Location: London (Onsite, 5 days per week) Salary & Benefits: £80,000– £120,000 + Benefits Investigo are partnered with an innovative AI technology company. They’re on a mission to transform the way businesses leverage systems through AI-powered solutions, and they’re looking for a Front-End Engineer More ❯

Front-End Engineer Location: London (Onsite, 5 days per week) Salary & Benefits: £80,000– £120,000 + Benefits Investigo are partnered with an innovative AI technology company. They’re on a mission to transform the way businesses leverage systems through AI-powered solutions, and they’re looking for a Front-End Engineer More ❯

Senior Frontend Developer This is an office based role requiring 5 days per week in their new London office. La Fosse are partnering with a market leader within the energy & trading sector, with a strong presence across oil & gas, renewables, power and carbon. They're in the market for a Senior Frontend Developer More ❯

Senior Frontend Developer This is an office based role requiring 5 days per week in their new London office. La Fosse are partnering with a market leader within the energy & trading sector, with a strong presence across oil & gas, renewables, power and carbon. They're in the market for a Senior Frontend Developer More ❯

now looking for a Frontend Engineer as the business continues to scale. What will you be doing: Be responsible for taking ownership of projects and running the front-end development for their customers Build the interfaces that allow customers to choose between different products to best find the product that meets their requirements Implement robust A More ❯

now looking for a Frontend Engineer as the business continues to scale. What will you be doing: Be responsible for taking ownership of projects and running the front-end development for their customers Build the interfaces that allow customers to choose between different products to best find the product that meets their requirements Implement robust A More ❯

Frontend Developer London - 3x Days per week on-site 3-6 Month Contract One of our major banking clients is looking for a Front end Developer. Must-Have Skills: Strong proficiency in React and JavaScript . Deep understanding of web accessibility standards and testing methodologies. Experience designing and implementing component libraries . More ❯

Frontend Developer London - 3x Days per week on-site 3-6 Month Contract One of our major banking clients is looking for a Front end Developer. Must-Have Skills: Strong proficiency in React and JavaScript . Deep understanding of web accessibility standards and testing methodologies. Experience designing and implementing component libraries . More ❯

Frontend Developer - (Fully Remote - UK) Frontend Developer Fully Remote (UK) + 40 days' Annual leave Up to £60,000 p/a + Equity Typescript + Vue preferred (open to other frontend frameworks) I am working with an exciting startup in the Payments Reconciliation space who already have product market fit and … are continuing to generate strong revenue after securing strong funding and valuable partnerships. They are looking for a Frontend Developer, specialising in Typescript and Vue, but open to cross-training from other frameworks. The ideal candidate would have a solid understanding of best engineering and design practices and experience working with international users as this business … continues to scale and internationalise. What will I be doing as a Frontend Developer? Delivering client-requested greenfield features developed in collaboration with product teams Continuing to scale the platform, opening it up to internationalisation as their customer numbers continue to grow Collaborating closely with internal engineering, product and design teams as well as More ❯

Frontend Engineer – React and Typescript – Hybrid 1-2 days onsite – 6-month initial contract We’re looking for a Front-End Engineer to join the DAX Ad Platform team, helping to build scalable, modular user interfaces within a modern React-based environment. You’ll play a key role in migrating features from a legacy platform to … performance, consistency, and maintainability across the product. What You’ll Do Contribute to the migration of legacy features into the new micro-frontend platform Build and maintain front-end features using a React + TypeScript stack Utilise and extend an internal component library to ensure consistency and scalability Implement complex form handling and validation using Formik … and Yup Integrate with GraphQL APIs via Apollo Client, and occasionally consume REST endpoints Manage client-side state efficiently and ensure smooth data flows Collaborate cross-functionally with designers, product managers, and engineers to deliver cohesive and accessible UI experiences Write unit tests and contribute to automated testing strategies using Vite and React Testing More ❯