1 to 25 of 38 Permanent Front-End Engineer (Client-Side Engineer) Jobs in the City of London

Role : Front-End Engineer within Quant/Research 📍 Location : London (Hybrid) 💰 Comp : Up to £175,000 + exceptional guaranteed bonus + full package 🏆 Company : Award-winning Quant Fund, founded by Computer Scientists Why this stands out: Tech Lead is not only an absolute/distinguished beast but one of the nicest people...probably … flat structured, elite team = real & visible impact Beautiful offices with all the expected perks like food, gyms etc What you will be working on: Building next-gen front-end systems powering real-time trading Crafting interactive dashboards and research tools with live insights and streaming data Working with the quants to turn complex models into intuitive … powered interfaces for instant updates Applying modern React patterns, component architecture, and performance optimisations to mission-critical apps Shaping the future of trading interfaces, using the latest front-end tech to solve unique quant challenges Innovating! Ideal background: Minimum 1 year+ experience with React/TypeScript/Next.js etc Ideally someone Python Solid CompSci fundamentals (degree More ❯

Role : Front-End Engineer within Quant/Research 📍 Location : London (Hybrid) 💰 Comp : Up to £175,000 + exceptional guaranteed bonus + full package 🏆 Company : Award-winning Quant Fund, founded by Computer Scientists Why this stands out: Tech Lead is not only an absolute/distinguished beast but one of the nicest people...probably … flat structured, elite team = real & visible impact Beautiful offices with all the expected perks like food, gyms etc What you will be working on: Building next-gen front-end systems powering real-time trading Crafting interactive dashboards and research tools with live insights and streaming data Working with the quants to turn complex models into intuitive … powered interfaces for instant updates Applying modern React patterns, component architecture, and performance optimisations to mission-critical apps Shaping the future of trading interfaces, using the latest front-end tech to solve unique quant challenges Innovating! Ideal background: Minimum 1 year+ experience with React/TypeScript/Next.js etc Ideally someone Python Solid CompSci fundamentals (degree 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 ❯

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 ❯

and applications that empower investment professionals across the business. The team is currently re-architecting its technology stack to become fully cloud-native (AWS), using React for front-end development and Python for backend services. You’ll be working in a culture that values craftsmanship, test-driven development, clean code, and collaboration through pair programming and … code reviews. What You’ll Do Build dynamic front-end applications and UI components using React, TypeScript, and modern libraries. Collaborate with UX and product teams to refine user journeys and ensure intuitive design. Deliver scalable and testable code within a cloud-native architecture. Partner with portfolio managers, researchers, and analysts to translate complex needs into … , and GraphQL/REST APIs . Experience working in a cloud-native environment ( AWS or Azure ). Familiarity with data streaming (WebSockets, chunked responses) and front-end performance optimisation . Strong understanding of testing frameworks (unit, integration, E2E) - Playwright experience a plus. Bonus points for knowledge of Material UI or other design systems, and More ❯

and applications that empower investment professionals across the business. The team is currently re-architecting its technology stack to become fully cloud-native (AWS), using React for front-end development and Python for backend services. You’ll be working in a culture that values craftsmanship, test-driven development, clean code, and collaboration through pair programming and … code reviews. What You’ll Do Build dynamic front-end applications and UI components using React, TypeScript, and modern libraries. Collaborate with UX and product teams to refine user journeys and ensure intuitive design. Deliver scalable and testable code within a cloud-native architecture. Partner with portfolio managers, researchers, and analysts to translate complex needs into … , and GraphQL/REST APIs . Experience working in a cloud-native environment ( AWS or Azure ). Familiarity with data streaming (WebSockets, chunked responses) and front-end performance optimisation . Strong understanding of testing frameworks (unit, integration, E2E) - Playwright experience a plus. Bonus points for knowledge of Material UI or other design systems, and 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 ❯

🚨 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 ❯

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 ❯

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 ❯

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 ❯

products that transform how businesses use technology. They are looking for highly talented engineers who are ambitious, driven, and eager to make an impact. Roles Available: 🔹 Frontend Engineer – Strong expertise in TypeScript and React What We’re Looking For: ✔️ A degree from a top university in Computer Science, Engineering, or a related field ✔️ Demonstrated ambition and 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 ❯

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 ❯

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 – 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 ❯

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 ❯

Senior Product Engineer (Frontend) 2 days a week in Central London Salary paying £90k-£105k + benefits Oliver Bernard have partnered with a high-growth, product-led tech company on the search for a Senior Product Engineer (Frontend) to take ownership of a core product area and help shape the technical and … are valuable and impactful. End-to-end ownership of projects in a lean, collaborative environment. Please apply now for more information. Senior Product Engineer (Frontend 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 ❯