Senior Frontend Engineer at Perk | London

About UsPerk, formerly known as TravelPerk, is an innovative platform specializing in travel and spend management. Our mission is to eliminate the tedious manual tasks that hinder productivity, automating everything from travel bookings to expense management and invoice processing. By addressing the inefficiencies that cost organizations significant time and…

Senior Frontend Engineer - Elevate User Experiences Are you a seasoned Frontend Engineer looking to make a significant impact? Join our dynamic and agile delivery team at ClearScore, where we are dedicated to crafting innovative experiences for our users through the latest technologies. If you thrive in a high-performance, entrepreneurial environment that celebrates the art of developing cutting-edge products and tackling complex challenges, we want to hear from you! As a valued member of our established cross-functional squad, you will focus on advancing our design system, enhancing our logged-out website, and exploring other groundbreaking technologies. We foster a culture of continuous improvement and creativity, inviting new team members to share their ideas and methodologies. Bring your expertise, and we'll share our knowledge in a collaborative and enjoyable atmosphere. At ClearScore, our world-class engineers are pivotal in fulfilling our mission to enrich the financial lives of millions. To learn more about our technology stack, visit our 2026 Tech Radar. Discover our work culture through our Behavioural Principles and Engineering Principles. Explore additional insights on our Tech Blogs on Medium. Your Responsibilities: Design, develop, and maintain full-stack solutions using Node.js and TypeScript, delivering data-driven user interfaces and backend services. Create intuitive client UX utilizing design systems and server-driven UI frameworks. Optimize and scale databases for large-scale applications, employing SQL, PostgreSQL, and indexing strategies to ensure performance and maintainability. Collaborate closely with skilled colleagues to implement, monitor, and optimize real-time data pipelines with Kafka, ensuring robust message handling and distributed system performance to enhance your features. Take ownership of end-to-end performance optimization, both client-side and server-side. Lead the deployment and maintenance of production-grade code and databases across multiple global markets. Monitor post-release performance, utilizing tools for reliability and system health. Engage in an Agile environment, mentoring team members across various specializations and fostering a culture of learning and continuous improvement.

TransPerfect is seeking a Senior Frontend Engineer to join its London-based team. This position plays a key role in developing and maintaining software products that support global operations. The focus is on delivering high-quality, reliable solutions that drive the company’s technology forward. Role overview The Senior Frontend Engineer will work on the design, development, and execution of software products. This includes taking responsibility for the quality of the user interface and ensuring that products meet both technical and user needs. The role involves collaborating with other teams to deliver solutions that support TransPerfect’s worldwide business. About the TechOps team TechOps has supported TransPerfect’s growth for more than ten years. The team builds and maintains technology that streamlines processes for both clients and internal teams. Projects range from workflow improvements to developing scalable interfaces for the GlobalLink platform, all aimed at making complex systems easier to use. What you will do Lead frontend development for software products used across global operations Ensure the quality and reliability of user interfaces Work closely with cross-functional teams to deliver scalable solutions

Location: London Start date: Immediate The Role: We are seeking exceptionally skilled and motivated software engineers who take pride in their craft to enhance our Engineering team based in London. As a successful candidate, you will collaborate within a cross-functional team that includes product managers and designers, working closely with the wider business to deliver effective code that addresses real-world challenges for both internal and external clients. You will take charge of the services overseen by your team, ensuring their development aligns with the overarching AlphaSights Engineering strategy, while also mentoring junior engineers. If you are passionate about problem-solving through coding and aspire to work alongside outstanding colleagues in a high-achievement environment, this position is ideal for you. What You’ll Do: Design Solutions: Define optimal technical solutions to business problems, contributing to a scalable architectural vision that aims to become the world's leading research platform. Ship Working Code: Our primary tech stack consists of React for the frontend and Kotlin microservices with Postgres for the backend, alongside some legacy services built in Ruby on Rails. We continually assess new technologies that could enhance our stack. Deploy and Iterate: We release updates frequently to our customers, utilizing CircleCI and Spinnaker for CI/CD, gathering feedback promptly to inform subsequent iterations. Build Your Competency: You will rapidly advance your skills by developing market-leading technology alongside experienced colleagues in a high-performance environment. Engineers can also utilize our L&D budget to accelerate their development of specific technical competencies. Maintenance and Troubleshooting: Diligently monitor our services to catch errors proactively, diagnose root causes, and deploy fixes before users are affected. Who You Are: You likely hold a degree in a STEM subject, but we are also open to candidates who have honed their skills through alternative pathways. Experience: Proven experience at a similar level within a mature Engineering team, with aspirations to elevate your career. We seek individuals with outstanding potential. Technical Expertise: Extensive knowledge in frontend engineering, including designing, building, and maintaining robust web applications.

About Kernel Kernel builds AI-powered data solutions for RevOps teams working with CRM systems. The company is supported by $14M in Series A funding from investors linked to Plaid, OpenAI, and Slack. Kernel aims to provide an AI-first alternative to established data providers like Dun & Bradstreet. Teams at organizations such as Navan, Gong, Mistral, and AlphaSense use Kernel's products to streamline and improve their operations. The engineering team manages around 30 billion tokens daily and runs more than 1.8 million agents, all on a streamlined architecture with a single database and queue. For scale, Kernel's queue processes about 365 million transactions each day, comparable to Visa's daily volume. All of this is achieved by a small, focused team. Role Overview Kernel is looking for a Frontend Product Engineer in London. This is a T-shaped role with a strong emphasis on frontend work. The position involves working closely with both product and engineering to design and ship user-focused features, maintain infrastructure, and support Kernel's growth. While deep design skills are not required, a solid grasp of UI/UX principles and a sharp eye for detail matter. The team values proactive, adaptable engineers who communicate clearly. With a lean structure, engineers are trusted to make decisions and ship code independently. This role offers the chance to help drive Kernel's growth from $3M to $30M ARR, taking ownership of projects from start to finish and shaping product and infrastructure decisions. What You'll Do Design and build product features that improve user workflows Work with design, product, and engineering to deliver strong user experiences Write and maintain clean, scalable code across the stack Support the performance and reliability of large-scale data operations Automate workflows to boost developer efficiency and reduce manual steps Integrate with CRMs and external APIs Join roadmap discussions and contribute technical insights What You'll Bring At least 6 years of experience in software or product engineering Strong skills with frontend technologies and frameworks

TransPerfect is searching for a Senior Frontend Engineer to join its London team. This role centers on building and refining software products that support both internal operations and client-facing solutions. The Senior Frontend Engineer will help guide development, quality, and delivery across a range of projects. The work involves collaborating with a global team to improve user experiences and streamline complex workflows. TransPerfect’s TechOps group has supported the company’s growth for over ten years, focusing on technology and services that make processes simpler for users and clients alike. Role overview Lead and contribute to the development of frontend features for software products Oversee quality and execution throughout the product lifecycle Work closely with international colleagues to deliver scalable solutions What we look for Experience in frontend engineering at a senior level Ability to collaborate within a global, cross-functional team Interest in improving both internal and client-facing systems This position is based in London and offers the chance to contribute to a company that values innovation and practical problem-solving.

Join our dynamic team as a Front End Developer specializing in React, CSS3, Redux, and Jest. This is a fantastic opportunity to work remotely for an initial period of 8 weeks on an exciting project.As a Front End Developer, you will be responsible for building responsive web applications and optimizing user interfaces to enhance user experience. Your expertise in modern JavaScript frameworks and testing methodologies will drive our project forward.

About EucalyptusOur mission is to make good health last a lifetime. With over 1 billion individuals globally living with obesity, we aim to tackle preventable chronic conditions and enhance long-term care.Eucalyptus is the driving force behind Juniper, one of the largest weight-management programs worldwide. We integrate GLP-1 medication with personalized nutrition, movement support, and clinician-led care from a diverse team of prescribers, nurses, health coaches, pharmacists, and dietitians. Our published clinical research indicates that our combined clinical and behavioral approach enables patients to achieve significantly greater weight loss during their treatment with Juniper, yielding results four times more effective.Our Growth Story:130% year-over-year revenue growth and a 90% reduction in cash burn, with over $100M raised from notable investors including BOND, NewView, Blackbird, and Airtree.Successfully supported over 350,000 patients facing obesity across our five markets.Received prestigious NICE endorsement to provide services to the NHS.Customized our offerings for thousands of patients in Germany and Japan.Drive Frontend Innovation and Shape Patient ExperiencesAt Eucalyptus, our goal is to simplify, secure, and enhance healthcare accessibility. Patients often encounter challenges navigating care, which is why our Growth squad is dedicated to creating impactful frontend web experiences that drive critical metrics such as retention, engagement, and conversions while enhancing the overall patient journey.Your contributions will be pivotal in experimenting with the frontend platform, designing and testing features that directly affect patient engagement with our services. This role presents an exciting opportunity to innovate and influence the future of healthcare delivery.

Join our passionate team at Ledger, where we are dedicated to redefining the landscape of digital ownership. Our mission is to empower users, creators, and enterprises to take control of their value with unparalleled freedom through technology that is accessible to everyone. We thrive on innovation, fostering a culture of curiosity and problem-solving that encourages every team member to challenge norms and develop groundbreaking solutions. At Ledger, we are committed to making self-custody accessible, giving individuals the keys to their financial futures. If you’re eager to make a significant impact, we invite you to become part of our journey.As the leading global platform for digital assets and Web3, Ledger secures over 20% of the world’s crypto assets through our advanced hardware wallets, with more than 7.5 million units sold across 200 countries. With headquarters in Paris and offices in various locations including London, we employ around 600 skilled professionals dedicated to developing secure products and services that allow individuals and businesses to manage their crypto assets with confidence.The TeamYou will be an integral part of the E-commerce Engineering team, which is responsible for the entire customer experience on ledger.com. This team oversees the customer journey from discovery to checkout, utilizing a modern technology stack (Next.js, Shopify, Contentful, Vercel) to deliver high-performance, conversion-optimized experiences.In our dynamic, product-focused environment, we prioritize frequent deliveries and continuous optimization in performance, SEO, and conversion rates.What You’ll Be DoingAs a Senior Frontend Engineer, you will play a pivotal role in shaping the web experiences that millions of customers rely on. This hands-on position involves significant ownership, where you will lead complex projects from conception through to production, influence technical direction, and uplift team standards through mentorship.Your responsibilities will include:End-to-End Project OwnershipLead the development of impactful features from inception to deployment.

Join Capco as a Principal .NET Developer in our London office, where you'll play a pivotal role in shaping cutting-edge technology solutions within the capital markets sector. We are looking for a highly skilled professional with a passion for innovation and a deep understanding of financial services.

We are seeking a talented and experienced Senior Frontend Engineer to join our dynamic team at Pigment. In this role, you will have the opportunity to work with cutting-edge technologies and contribute to the development of innovative solutions that drive our business forward.Your responsibilities will include collaborating with cross-functional teams to design and implement user-friendly interfaces, optimizing application performance, and ensuring the highest quality standards in our products.

Why Join Socure?At Socure, we are at the forefront of establishing the identity trust infrastructure for the digital economy, ensuring the verification of 100% legitimate identities in real-time while preventing fraud before it occurs. Our mission is vast and our challenges are intricate, impacting businesses, governments, and millions of individuals worldwide every day.We seek individuals who are eager to embrace significant responsibilities. If you are someone who thrives in a fast-paced environment, thinks critically, acts with ownership, and is deeply committed to delivering precise solutions for our customers, you’ll find your place here. This is not a setting for those who prefer predictability or limited scope. If you are driven to help shape the future of identity with a team that maintains high standards, continue reading.As a Senior Frontend Engineer on our RiskOS team, you will play a crucial role in developing intuitive, high-performing, and reliable web applications that empower our users to proactively identify and mitigate risks. You will engage in every aspect of the software development lifecycle—from architectural design to implementation, testing, and production support. By leveraging modern frontend technologies and best practices, you will not only advocate for optimal solutions but also mentor fellow engineers. This role is ideal for frontend specialists who are passionate about creating design systems, enhancing user experiences, and making a considerable impact at scale.Your Key Responsibilities:Design and develop robust user interfaces based on high-fidelity designs and functional specifications of varying complexity.Collaborate closely with product managers, designers, and engineers to deliver a customer-focused product that exceeds expectations.Take ownership of features from design reviews to production deployment, ensuring high quality, usability, and performance.Develop comprehensive unit, integration, and end-to-end tests to ensure code robustness and extensive functional coverage.Translate complex technical and product challenges into manageable tasks and drive them to successful completion.

Join Metaview as a Product EngineerAt Metaview, we are revolutionizing the way hiring is done through Human-Computer Symbiosis — a concept that minimizes toil and maximizes efficiency in workflows. Our innovative approach leverages AI copilots to enhance productivity, ensuring that our users experience more flow-state and insight in their work processes.Founded by former Uber and Palantir engineers, our team is composed of high-performing individuals passionate about creating outstanding products that alleviate the challenges of traditional hiring. We empower thousands of users at leading companies including Quora, Robinhood, Brex, Elastic, and Replit.We are seeking a dedicated Product Engineer who is not just a coder but a visionary, passionate about crafting user-centric solutions. You will play a pivotal role in the design, development, and operational excellence of our products, working collaboratively within a small and agile team.As a Product Engineer, you will primarily focus on frontend technologies while being encouraged to explore other facets of our technology stack. Your adaptability and eagerness to learn new languages and tools will be essential as our product continues to evolve.

Join Our Engineering TeamAt CoreWeave, we are revolutionizing the AI landscape. Our Monolith AI Engineering Team is dedicated to constructing and enhancing the foundational platform that drives the most sophisticated engineering simulations and AI workflows. Our mission is to transform into the super-intelligent AI test lab for the engineering sector, empowering our clients to "ship science, faster." We focus on advancing distributed architecture and facilitating the next wave of agentic interfaces and physical AI, providing the reliable and scalable infrastructure that the world’s leading engineering firms depend on.Your RoleWe are seeking a talented Fullstack Engineer with a Frontend Focus. You will take charge of the Monolith platform’s product surface, which offers a data-rich, workflow-centric web interface where engineers can design experiments, compare outcomes, interact with agents, and convert intricate physical test data into actionable insights. Your collaboration with Design, Product, and Backend Engineering teams will be crucial in delivering a UI and UX that is fast, intuitive, and dependable for non-ML expert engineers. Additionally, you will contribute to our Python backend services as needed.Position OverviewThis is an IC5 Fullstack Staff Engineer role with a significant emphasis on frontend development (approximately 80–90%). We are also open to exceptional candidates for the Senior Fullstack Engineer II (IC4) level who can perform at a staff-like capacity. You will be responsible for the Monolith web application, focusing on component architecture, design system evolution, performance, and user experience for complex, data-rich workflows. You will also engage with our Python services (FastAPI/Flask) to shape and integrate APIs and implement new platform capabilities, enhancing user experiences.

About AlaroAt Alaro, we're pioneering a transformative approach to legal services, establishing ourselves as an AI-native law firm from the ground up. Our mission is to leverage artificial intelligence and data to redefine how lawyers work, enabling them to focus on high-value judgment and outcomes rather than mundane tasks.The legal sector, valued at over a trillion dollars globally, has yet to fully embrace the technological advancements that have reshaped countless other industries. We understand that AI is not here to replace legal expertise; instead, it is set to revolutionize the operational frameworks that support it. As AI continues to evolve client expectations, firms willing to adapt will lead the future of legal services.Founded in April 2025, we successfully raised $2 million in pre-seed funding, followed by a $7 million seed round led by a premier US venture capital firm. Our innovative product is actively utilized by our legal team on real cases, fostering a continuous feedback loop that drives our development. With a growing roster of early clients and a dedicated engineering team, we invite you to join us at this exciting stage of our journey.Our Work CultureSwift Execution and Solid Foundations: We prioritize delivering functional products quickly, followed by enhancing and stabilizing them based on user feedback. Progress is our core objective, but quality remains essential.Autonomy and Flexibility: We value outcomes and trust our team members to manage their time effectively, taking full responsibility for their contributions.AI-Driven Approach: AI is integrated into all aspects of our operations, ensuring seamless collaboration between humans and technology.Remote-First with Global Collaboration: Our distributed team thrives on regular communication and in-person gatherings when necessary to maintain alignment.What We ProvideSignificant Ownership: Competitive compensation paired with meaningful equity, ensuring you have a real impact from the outset.Close-Knit Team Dynamics: Work alongside founders and senior engineers, directly influencing our systems, culture, and operational strategies as we expand.Access to Advanced AI Tools: We offer an unlimited budget for AI coding tools, encouraging you to harness these resources to enhance your work.Team-Building Opportunities: We organize annual company retreats in Alaro, Mallorca, and regular team meetings in our offices to foster collaboration and innovation.

TL;DRJoin Deducta, a rapidly growing startup dedicated to addressing critical data challenges for some of the world's largest enterprises. With substantial funding and a commitment to innovation, we are positioned at the forefront of data intelligence.We seek a Senior Frontend Product Engineer to significantly influence our product's design and functionality. Your primary responsibilities will include:Delivering high-quality code swiftly across various frontend functionalities.Pioneering the integration of Large Language Models (LLMs) to enhance or replace traditional user interfaces. Location: London, UK. We encourage in-person collaboration within our office located near London Bridge. Compensation: Total remuneration for this position exceeds £150k. Visas: We provide visa sponsorship for the ideal candidate. Start Date: As soon as possible. About DeductaDeducta is a pioneering data intelligence platform catering to global enterprises. Our mission is to offer unparalleled insights into mission-critical data, beginning with spend data, to support significant business transformations.Our partners leverage Deducta to achieve impactful results at an unprecedented pace. Role OverviewOur deployment of cutting-edge LLMs for language analysis has empowered us to tackle customer challenges at scales and accuracies previously deemed impossible.As a Senior Frontend Product Engineer, you will shape the product's design and collaborate with a dedicated team to execute swiftly and efficiently.Key Responsibilities:Conceptualize, prototype, and develop new experiences within the Deducta application, including the integration of LLMs to enhance traditional interfaces.Utilize existing design components and innovate new ones.Create and present your design and product architecture suggestions while providing constructive feedback to peers.Produce high-quality, thoroughly tested pull requests, and review designs and code from colleagues.Maintain a strong focus on user satisfaction throughout all development stages.Success in this role entails:Consistently delivering high-quality outcomes across various responsibilities, from design inception to feature rollout. Ideal Candidate ProfileWe seek a seasoned engineer with over 5 years of experience, a solid foundation in JavaScript, the ability to identify challenges, and the drive to take ownership from proposal to production, all while contributing to a market-leading product.You may be the perfect fit if you possess:Experience with Vue.js, Tailwind CSS, and Tanstack.A proven track record of writing clear, maintainable code in a collaborative environment.A strong understanding of design fundamentals, not merely the aesthetic elements.

Role overview Deliveroo is looking for a Senior Frontend Software Engineer to help shape the future of its platform. This role focuses on building high-quality user experiences and working closely with teams across the company. What you will do Develop and maintain frontend features for Deliveroo’s applications Collaborate with engineers, designers, and product managers to deliver seamless user experiences Apply expertise in modern web technologies to create engaging, reliable interfaces Location This position is based at Deliveroo’s London headquarters in The River Building.

Position: Contract Technical Lead - Fullstack (Java/React)Compensation: £500 per dayContract Length: 6 monthsExpected Start: Early AprilWork Arrangement: On-site 2 days per week at our City of London officeAbout Us:AND Digital is a progressive technology firm committed to expediting digital transformation and bridging the digital skills gap. Since our inception in 2014, we have partnered with organizations to create superior digital products and cultivate robust digital teams.We strive to make a significant impact in everything we do, focusing on building strong, collaborative relationships with our clients through our regional offices, known as 'Clubs', ensuring they are supported by a dedicated team close to them.Our unique model has propelled our success, reflected in our impressive organic growth since 2014. Currently, we boast a workforce of over 1,300 professionals across Clubs in the UK, Europe, and the USA, with plans for global expansion in the coming years.Join us in our mission to close the digital skills gap across the globe.Your Role:We are on the lookout for a hands-on Technical Lead, who will also serve as an Architect and Engineering Leader, to spearhead a complex modernization initiative.Your Leadership & Influence:Technology Engineering Leadership: Demonstrated success in leading intricate software engineering projects, with a talent for converting enterprise-scale challenges into opportunities.Stakeholder Management: Proficient in client-facing delivery, with the ability to translate complex architectural solutions into substantial business value.Hands-on Approach: Comfortable leading projects from the front, with a focus on technical execution and a readiness to assist teams in achieving their goals.Your Strategic Mindset:Champion of Quality: You take pride in your work, advocating for quality assurance, security, and performance to ensure our client solutions are durable and trusted.Industry Knowledge: Committed to continual learning, staying abreast of industry standards, emerging engineering patterns, and best practices.Your Technical Expertise:Leading by example, you maintain the technical acumen necessary to oversee projects from architecture through to production and operational support.Engineering Proficiency: Full-stack experience in multiple programming languages, particularly Java and React, with a comprehensive understanding of engineering methodologies including pair programming, TDD, security by design, and observability.

Role Overview Utility Warehouse is looking for a Frontend Software Engineer to join the Lifecycle Customer team in London. This group focuses on building web applications that improve how customers interact with our services and help keep them engaged. What You Will Do Work with designers and backend developers to create clear, responsive user interfaces Build features that make our digital products easier and more enjoyable to use Contribute ideas and code that influence our web platforms and customer experience About the Team The Lifecycle Customer team supports Utility Warehouse’s goal of delivering strong value to customers. Collaboration and a focus on usability are central to how we work.

About UsPhysicsX is an innovative deep-tech company at the forefront of numerical physics and Formula One, dedicated to revolutionizing hardware innovation through software acceleration.We are crafting a cutting-edge AI-driven simulation software stack tailored for engineering and manufacturing in advanced industries. Our platform enables high-fidelity, multi-physics simulations via AI inference throughout the entire engineering lifecycle, unlocking unparalleled levels of optimization and automation in design, manufacturing, and operations. We empower engineers to push the boundaries of possibility, serving leading innovators in Aerospace & Defense, Materials, Energy, Semiconductors, and Automotive sectors.The RoleAs part of our product team, PhysicsX is creating a platform utilized by Data Scientists and Simulation Engineers to construct, train, and deploy Deep Physics Models. The backbone of this platform is the management of vast volumes of intricate simulation data, facilitating high-fidelity multi-physics simulations through AI inference.We are seeking a Senior Frontend Software Engineer to join our dedicated team of Frontend Engineers. You will work collaboratively in a cross-functional environment, where you will have the autonomy to influence implementation decisions. You will be responsible for developing and enhancing the frontend that animates our platform — from dynamic 3D visualizations of simulation data to seamless API integrations that enable complex machine learning workflows. You will architect composable frontend structures, optimize performance for data-intensive interfaces, and ensure intuitive interactions for our engineers and scientists handling large datasets and simulation outputs.In this senior role, you will significantly shape the technical direction — authoring Technical Decision Records, mentoring junior engineers, and establishing standards that ensure our platform remains reliable, secure, and efficient. This position is perfect for a creator passionate about delivering exceptional user experiences and building robust frontend architectures.What You Will DoDevelop and improve a frontend platform that supports intricate simulation and machine learning workflows — from 3D visualizations to seamless API integrations and data-heavy interfaces.Design and implement scalable frontend architectures and component systems, including micro-frontend patterns, to facilitate maintainable development.Enhance user experience through advanced caching strategies, performance monitoring, layout optimization, and accessibility best practices.Develop and implement sophisticated state management and data flow patterns to accommodate real-time simulation data and complex user interactions.Take ownership of your work from inception to completion, ensuring high-quality results.