Principal Frontend Developer - React

Join our dynamic team as a Principal Frontend Developer specializing in React. In this role, you will lead the design and implementation of innovative frontend solutions, collaborating closely with cross-functional teams to deliver high-quality products that meet user needs. Your expertise in modern frontend technologies will drive our projects forward and shape the future of our digital offerings.

Join our dynamic team at Ratio Recruitment Ltd as a Frontend Web Developer specializing in React. We are seeking a talented individual who is passionate about creating innovative web applications and enhancing user experiences. You will be responsible for developing responsive web interfaces, collaborating with designers and backend developers, and ensuring high-quality code through best practices.

As a Lead Frontend Developer at Capco, you will be at the forefront of creating dynamic, responsive web applications tailored for the financial services sector. Your role will involve leveraging your expertise in React and modern JavaScript frameworks to develop innovative user interfaces that enhance the digital experience for our global clientele. Working in a collaborative, agile environment, you will not only take charge of hands-on development but also mentor peers and enforce best practices across teams. Join us in transforming financial technology through cutting-edge web solutions.

TransPerfect, a well-established organization with an innovative start-up atmosphere, is on the lookout for imaginative and entrepreneurial talent to enhance our dynamic team. We are currently seeking a Frontend Engineer to join our global operations, responsible for the quality, development, and execution of our software products. If you are eager to join a flourishing company and make a significant impact from day one, we want to hear from you!Join the TransPerfect – TechOps Team:The TechOps team at TransPerfect has been pivotal to our success for over a decade, providing technology and services that have greatly simplified the experiences of our clients and colleagues. From enhancing workflow processes to delivering essential services that support our GlobalLink platform, we strive to build scalable client interfaces that enable users to effortlessly navigate complex systems.

TransPerfect, a well-established company that thrives on a dynamic start-up culture, is on the lookout for innovative, entrepreneurial individuals to enhance our team. We are seeking a Frontend Engineer to be a key player in our global team, responsible for the quality, development, and execution of our cutting-edge software products. If you are eager to contribute to a rapidly growing company and make an immediate impact, we would love to hear from you!About TransPerfect – TechOps:The TransPerfect TechOps team has been instrumental to our success since its inception over a decade ago. We deliver technology and services that significantly simplify the workflows of our clients and colleagues—from improving internal processes to developing core services that are foundational to our GlobalLink platform. Our team creates scalable client interfaces that empower novice users to navigate complex ecosystems with ease.

About NevisNevis is revolutionizing the financial sector with the launch of the world's pioneering AI wealth management platform. In just nine months, we have successfully amassed over $50 billion in assets under management and we project to surpass $100 billion by year-end.Supported by leading investors, we have raised a total of $40 million from prominent firms including Sequoia Capital, ICONIQ, and Ribbit. This positions Nevis as one of the most highly funded and rapidly growing Series A startups in Europe.The RoleWe are seeking a passionate Frontend Software Engineer who appreciates the artistry of interfaces and sees code as a craft. In this pivotal role, you will design and develop Nevis’ core product, an innovative AI-native wealth management platform, and bring intelligent workflows to life for financial advisors around the world.You will collaborate closely with designers and backend engineers to swiftly transform ideas into reality. If you are enthusiastic about modern web technologies, value design excellence, and are eager to deliver impactful products, you will excel in our dynamic environment.What You’ll DoWork together with designers to create visually stunning and intuitive features.Translate intricate AI and financial data into user-friendly interfaces.Write clean, well-tested, and reusable code while mentoring others in best practices.Contribute to the evolution of our design system and enhance frontend craftsmanship.Rapidly prototype, solicit feedback, and iterate on solutions.Partner with backend engineers to seamlessly integrate APIs and visualize data.Pay meticulous attention to performance, accessibility, and the finer details that users appreciate.Who You AreYou possess extensive experience with TypeScript and a deep understanding of JavaScript.You are well-versed in React and eager to leverage the latest features.You have a thoughtful approach to component design, focusing on composable APIs and clear abstractions.You have an understanding of modern web dynamics including browser performance and the elements that contribute to a responsive interface.You are adept with contemporary tooling such as Vite, SCSS, and component libraries.You are proficient in delivering features from inception to production.

About the RoleWe are excited to announce an opening for a Senior Frontend Engineer who will take charge of the user interface layer of ThreatAware's dynamic platform. Your main responsibilities will include developing the dashboard, enhancing data visualization, and crafting interfaces for our innovative AI-powered features. You will be working with TypeScript using Angular and React, reporting directly to the Head of Engineering, and collaborating closely with our R&D teams to seamlessly integrate AI functionalities into our platform. If you have a passion for creating stunning interfaces, an eye for detail, and a desire to tackle complex UI challenges with significant real-world implications, this position is perfect for you.Why Join ThreatAware?At ThreatAware, we provide security teams with a comprehensive source of truth for every device and tool within their organization. With over 150 integrations, rapid deployment in under 30 minutes, and real-time visibility across entire IT infrastructures, we have earned the trust of sectors such as finance, legal, energy, and healthcare. We're on a mission to build something even more impactful. After six years of curating accurate cyber asset data, we are now integrating AI to offer new methods for security teams to analyze their data, automate workflows, and proactively manage risks before they escalate. In this role, you will design intuitive interfaces that enhance user experience.Your ResponsibilitiesTake ownership of the frontend that transforms intricate security data into clear insights.Design and develop the platform dashboard and AI workspace UI using TypeScript (Angular and React) — ensuring a data-rich, real-time experience used daily by enterprise security teams.Tackle challenging visualization problems: managing thousands of security events, device interconnections, and AI-driven insights without overwhelming users.Establish a robust component architecture, design systems, and frontend standards that evolve as the team and product expand.Collaborate closely with R&D to translate AI capabilities into user-friendly, polished interfaces.Partner with product and design teams to define and enhance the user experience, rather than just executing it.Mentor junior frontend engineers and elevate the quality of frontend development within the team.Qualifications We SeekExtensive experience with TypeScript, Angular, and React, with a deep understanding of component architecture, state management, and performance optimization.A strong aesthetic sensibility, with a commitment to creating beautiful interfaces and a keen awareness of modern design trends, paying close attention to the details that contribute to a polished product.Proven track record in building data-intensive, high-performance web applications, ideally those that involve real-time data or complex visualizations.Ability to work in a collaborative environment and effectively communicate ideas and solutions.Prior experience in mentoring and guiding junior team members is a plus.

LocationLondon, UK - Hybrid – 3 days in office - Office location: Central London (Victoria area)About the RoleJoin our dynamic team as a Mobile/Frontend Engineer where you will leverage your expertise in React Native and TypeScript to enhance and develop a tablet-based Point of Sale (POS) application.This position is perfectly suited for individuals with a strong mobile development background grounded in frontend technologies. Most of our codebase is built using React Native, along with a bit of Next.js for our web interfaces.You will focus on elevating UI quality, optimizing performance, and crafting new features in a fast-paced startup setting where AI technology is an integral part of our development process.Key ResponsibilitiesDevelop and maintain features for our tablet-based POS applicationUtilize React Native and TypeScript extensivelyEnhance UI/UX quality and streamline the existing codebaseRefactor and optimize frontend code for improved performance and reliabilityCollaborate with product engineers and backend developersRapidly deliver new features while ensuring high standards of code qualityEffectively utilize AI-assisted development toolsRequired Experience & SkillsProven experience with React Native and TypeScriptBackground in frontend engineering (JavaScript, React ecosystem)Experience in developing mobile or tablet applications (excluding native Swift/Kotlin)Ability to enhance and maintain existing codebasesExperience in startup or fast-paced settingsAdept at rapidly iterating on product featuresPreferred QualificationsFamiliarity with Next.jsExperience in POS, payment systems, or fintech productsUnderstanding of AI-driven development workflowsExperience collaborating with product or design teamsWhat We ValueWe seek front-end engineers who are passionate about their craft and committed to delivering exceptional user experiences.

About Air Apps Air Apps was founded in 2018 by a family in Lisbon, Portugal. The company’s mission is to build the world’s first AI-powered Personal & Entrepreneurial Resource Planner (PRP). With over 100 million downloads worldwide, Air Apps operates from offices in Lisbon and San Francisco. As a self-funded team, Air Apps focuses on developing AI-driven solutions that make a real difference in resource management for individuals across the globe. Role Overview: React Engineer The React Engineer will focus on building responsive and accessible user interfaces for web applications. This role involves close collaboration with designers, product managers, and backend engineers to turn wireframes and prototypes into polished, scalable front-end experiences. The goal is to deliver seamless and engaging interfaces that users enjoy. This posting is part of Air Apps’ effort to grow its talent pool ahead of the official job launch. Candidates will be contacted when the position becomes active. Work Environment Location: Fully onsite at the Lisbon office. Work closely with cross-functional teams in a collaborative setting. Relocation support is available. Key Responsibilities UI/UX Implementation: Develop high-quality, responsive interfaces that match design requirements and work well across browsers and devices. Frontend Technologies: Use modern JavaScript frameworks and libraries such as React, Vue.js, or Angular, along with HTML5, CSS3, and responsive design techniques to build and maintain code. Performance Optimization: Improve page load speed, rendering, and the overall user experience. Integration with APIs: Collaborate with backend teams to connect RESTful or GraphQL APIs, ensuring smooth data exchange between client and server. Accessibility and SEO: Follow best practices for accessibility (including WCAG standards) and search engine optimization to improve usability and reach.

The Opportunity:We are seeking talented and motivated software engineers who take pride in their craft to join our Engineering team in London. As a successful candidate, you will collaborate with a cross-functional team that includes product managers and designers to deliver impactful solutions for both internal and external stakeholders. You will take ownership of the challenges your team tackles, ensuring that we maintain a high standard of quality in all our releases while being part of a high-performing international development team. If you are passionate about solving problems with code and desire to work with exceptional colleagues in a dynamic environment, this role is an excellent fit for you. Your Role:Design Solutions: Formulate optimal technical solutions to business challenges, contributing to an architectural vision aimed at positioning us as the world’s leading research platform.Ship Working Code: Primarily working with React on the frontend and Kotlin microservices with Postgres on the backend, along with legacy services in Ruby on Rails. We continually explore new technologies to enhance our stack.Deploy and Iterate: We frequently release updates to our users, utilizing CircleCI and Spinnaker for CI/CD, and swiftly gather feedback to inform subsequent iterations.Build Your Competency: Accelerate your learning by developing cutting-edge technology alongside experienced colleagues in a high-performance atmosphere. Engineers have access to our Learning & Development budget to enhance specific technical skills.Maintenance and Troubleshooting: Diligently monitor our services, identifying issues before users are impacted, diagnosing root causes, and deploying effective fixes. Who You Are:You likely hold a degree in a STEM field, but we welcome candidates who have honed their skills through alternative paths.Relevant Experience: You have worked at a similar level in a well-established Engineering team and are eager to elevate your career. We seek individuals with exceptional potential.Technical Proficiency: Frontend expertise with at least one framework, preferably React.Proven Impact: You have a track record of making significant contributions in your previous roles.

Join Our Innovative Team at BiglightAt Biglight, we pride ourselves on being an experience design agency that merges deep customer insights with cutting-edge UX and design principles. Our mission is to empower leading brands by crafting extraordinary customer experiences through continuous innovation and experimentation.As we broaden our horizons into component library and design system development for enterprise clients, we invite you to be a part of this exciting journey. This role centers around the creation and upkeep of a complex UI component library, vital for both e-commerce and B2B web applications serving a prominent UK brand.You will leverage modern frontend technologies such as Preact, TailwindCSS, and Storybook to build reusable, accessible, and visually stunning components that are foundational to our client’s digital ecosystem. Our library boasts over 70+ components, 200+ detailed stories, and supports multiple themes with automated CSS generation.This hands-on development role requires you to take ownership of components from inception to completion, including implementation, Storybook documentation, accessibility compliance, and cross-theme testing. Each component will have its dedicated QA environment, and you'll work collaboratively with designers utilizing integrated Figma tools.Collaboration is key; you will work alongside the client’s product engineering team, participating in daily standups and contributing to a shared roadmap that encompasses UI enhancements across the platform, a mobile-first redesign, and new feature development.As a client-facing role, you will engage with clients during standups, gather requirements directly from stakeholders, and work closely with their product and engineering teams. We are seeking an individual who is confident in client communication, adept at asking clarifying questions, and skilled at translating business needs into robust technical solutions alongside the broader team.

About Wahed Technologies Wahed Technologies is working to make finance accessible and ethical for everyone. Many traditional financial systems rely on interest (riba), which can create obstacles for those who want to manage their money and build wealth while staying true to their values. The team at Wahed is building an entirely interest-free financial ecosystem. Their products include Shariah-compliant equity ETFs, riba-free high-yield savings alternatives, and real estate investments without leverage. Team members are based in locations around the world and share a commitment to making finance more inclusive. The company is looking for people who want to tackle complex problems and help create a fairer financial future.

Join Zaizi as a Frontend Developer and be a part of a dynamic team committed to delivering exceptional digital solutions. In this role, you will leverage your expertise in frontend technologies to design and develop user-friendly applications that enhance the user experience.

Join Canva as a Principal Frontend Engineer and lead the charge in developing innovative web applications that empower users worldwide! In this pivotal role, you’ll collaborate with cross-functional teams to create seamless user experiences and optimize performance.

Join us at elasticstage as a Senior Frontend Engineer and play a crucial role in revolutionizing the music industry. Our innovative technology enables the production of on-demand vinyl records, providing a platform for music creators to effortlessly create and sell their music worldwide at no cost. We collaborate with top record labels, streaming services, digital providers, distributors, and renowned global artists to deliver a comprehensive solution for physical media. Our mission is to empower small and emerging artists, offering them seamless access to market their vinyl and CDs to fans through our state-of-the-art production and fulfillment centers across Europe, the USA, and Asia.The vinyl market has experienced consistent growth of over 20% annually for the past 16 years, and CDs are witnessing a resurgence for the first time in two decades. By 2030, we anticipate nearly 200 million music creators globally, with AI further accelerating this growth. Many artists aspire to have their music available on vinyl or CD for their friends, family, and fans, and our scalable on-demand technology makes this accessible without the burden of high costs or minimum orders. At elasticstage, we provide easy and affordable access to this burgeoning market.As a Senior Frontend Engineer, you will take ownership of our front-end platform, engaging in hands-on development while providing technical leadership and direction. You will collaborate closely with product, design, and backend engineering teams to deliver exceptional user experiences across our e-commerce platform, creator tools, and operational systems.Join us and contribute to scaling a dynamic, high-profile disruptor in the music industry!

Role overview Talan is hiring a Senior C# React Developer in London to support software development for investment banking clients. This role centers on building and maintaining applications that meet the demands of the finance sector. Strong experience with both C# and React is essential to ensure reliable and effective solutions. What you will do Design and develop complex financial applications using C# and React Collaborate with colleagues from various backgrounds to align solutions with client requirements Play a key role in shaping the architecture, implementation, and ongoing improvement of critical systems Collaboration This position involves working closely with cross-functional teams. Sharing expertise and ideas is part of the daily routine, helping to achieve business objectives and deliver quality outcomes for clients.

Join our dynamic team as a Senior Frontend Engineer at AECOM, where you will be at the forefront of developing innovative web applications and user interfaces. We are looking for an enthusiastic engineer with a passion for crafting seamless and engaging digital experiences. You will collaborate with cross-functional teams to design and implement robust solutions that enhance user interaction and satisfaction.

Front-End Developer – React or Angular (Front Office & Risk Systems)Exciting Opportunities with MARGO in LondonMARGO is a leading tech-driven consultancy dedicated to delivering exceptional IT solutions to the financial services sector.We excel in intricate Front Office and Risk environments where user interfaces play a pivotal role in trading, risk management, and decision-making systems. Our expert consultants focus on crafting and developing high-performance, real-time, and sustainable UI platforms utilized daily by Front Office, Risk, and technology teams.By joining MARGO, you will tackle technically challenging UI platforms while collaborating closely with business users. You will thrive within a supportive structure that emphasizes strong engineering principles and personalized career advancement.Business ContextIn this role, you will be integral to the evolution of modern web-based user interfaces within Front Office and Risk technology environments.The platforms you will work on typically facilitate:· real-time trading and monitoring workflows· risk and P&L visualization· analytics and control dashboards· operational and decision-support toolsThis position demands a strong commitment to UI architecture, performance, and code quality, with close collaboration among backend, production, and business teams.Role OverviewWe seek a Front-End Developer with substantial expertise in either React or Angular to engage with intricate Front Office and Risk UI platforms.Candidates should be proficient in one of these frameworks; we require deep knowledge rather than a general familiarity.

We are seeking a talented Full Stack Developer to join our dynamic team at Vitol, where you will collaborate closely with various business lines. This role presents a unique opportunity to engage with both technical and non-technical experts to create innovative solutions and full-stack applications that are utilized globally across numerous commercial and operational desks. Your contributions will significantly influence decision-making through the development of cutting-edge solutions.In this role, you will play an integral part in transforming our existing application landscape. Your ability to swiftly comprehend business needs, communicate effectively, work autonomously, and rapidly prototype and iterate on new and existing requirements will be essential in delivering state-of-the-art solutions that empower our commercial teams.As a Full Stack Developer at Vitol, you will exemplify:Rapid Prototyping: Collaborate closely with operations and commercial teams to construct and support market-driven business development applications and enhance existing tools by swiftly iterating based on user feedback to create actionable, value-adding solutions.Project Management: Analyze ongoing business and user requirements while independently managing project lifecycles from start to finish within the team.Innovation: Propose innovative and reliable technical solutions that enhance existing processes or uncover new opportunities for the business.Platform Expertise and Integration: Develop a comprehensive understanding of Vitol's Management Information Systems (MIS) platforms and tools, including their functionalities and capabilities, to ensure their success.

About Air Apps Air Apps began in 2018 as a family-founded company in Lisbon, Portugal. The team focuses on building AI-powered tools that help people and entrepreneurs manage their resources more efficiently. Their Personal & Entrepreneurial Resource Planner (PRP) has reached over 100 million downloads worldwide, all through a self-funded approach. The company values creativity and challenges conventional thinking, aiming to deliver AI-driven solutions that make a real impact. Every team member’s ideas contribute to products that empower users around the globe. Frontend Web Developer Role The Frontend Web Developer will help design, build, and optimize user interfaces for Air Apps’ AI-powered platform. This role works closely with designers, product managers, and back-end developers to create web experiences that are both visually appealing and high performing, reaching millions of users. Location Details This is a fully onsite position based in the Lisbon office. Relocation support is available for those moving to Lisbon.