Top Front End Developer Jobs in Lisbon

Build and maintain high-performance JavaScript and TypeScript SDKs, payment components, and merchant-facing web applications. Develop responsive, accessible, secure interfaces handling complex payment data and workflows. Collaborate across Product, Design, and Engineering, contribute to backend-for-frontend services, optimize performance, implement testing and observability, and manage client library versioning and documentation. The role requires strong browser fundamentals, React experience, visual craftsmanship, and familiarity with security-sensitive transactional environments.

Build and own complex, high-performance frontend experiences for observability products using Angular or another major frontend framework. Lead frontend architecture, translate complex data into intuitive interfaces, collaborate cross-functionally, write tested production code, review code, mentor engineers, and drive features from concept through production.

Develop and maintain frontend applications and backend services supporting analytics, dashboards, visualizations, and AI-powered features. Build APIs, data models, processing workflows, and reusable interface components. Integrate AI-generated outputs into customer products, collaborate with product, UX, data, and engineering teams, and support testing, observability, deployment, scalability, and reliability.

Designs and leads sophisticated frontend applications for AI-powered digital agents. Responsibilities include building real-time conversational interfaces, reusable web components, streaming interactions, human handoffs, API integrations, accessibility, security, performance, observability, and analytics. The role influences frontend architecture, leads complex initiatives, conducts technical reviews, troubleshoots production issues, establishes engineering standards, and mentors engineers while collaborating with Product, UX, backend, AI/ML, and platform teams.

Build and operate production AI backend systems powering inference and orchestration. Responsibilities include designing reliable low-latency services, optimizing inference, caching, batching and streaming, supporting monitoring and incident response, and debugging distributed systems under load. The role requires backend engineering fundamentals, familiarity with LLMs, embeddings and multimodal AI, and the ability to deliver stable APIs integrated with frontend and machine learning systems.

Lead a hands-on frontend engineering team building partner acquisition and onboarding products. Architect scalable frontend and backend systems, oversee React and TypeScript development, integrate Kotlin, AWS, and Salesforce workflows, and establish experimentation infrastructure with Growthbook. Drive A/B testing, AI-assisted engineering practices, modern SDLC standards, code reviews, system design, and team performance across six engineers.

Develop complex cloud application front-end modules using HTML, CSS, JavaScript, and Vue.js. Ensure UI/UX feasibility, create reusable code and libraries, support SPA modules, maintain cross-browser compatibility, and collaborate with the engineering team on product development and continuous improvement.

Build and maintain React and TypeScript web applications, owning features from concept through production. Collaborate with product, design, backend, and engineering teams; improve frontend architecture and development practices; ensure performance, responsiveness, accessibility, and maintainability; review code; and contribute to 3D visualizations, interactive maps, geospatial applications, and data-heavy experiences.

As a Front-End Web Developer, you'll create high-performance web applications, collaborating with designers and back-end developers to optimize user interfaces using modern technologies.

Develop and support large frontend features, refactor existing code, and collaborate on full-stack and AI-related initiatives. Work primarily with React-based applications, ensure browser performance and correct network behavior, and apply solid programming patterns and algorithmic reasoning.

Design, architect, implement, and maintain React and TypeScript web applications. Develop responsive HTML/CSS pages and email templates optimized for SEO and Core Web Vitals. Write unit and integration tests, solve technical challenges, collaborate with the team, and take ownership of project delivery. Preferred experience includes Redux, React Query, Jest, Cypress, and SSR/SSG frameworks such as Next.js, Astro, or Remix.

Looking for a Frontend Developer with experience in JavaScript and its frameworks, along with HTML5, CSS3, and REST APIs for a collaborative team.

Build and modernize Productboard’s frontend platform, migrating its legacy design system to Spark UI. Design AI-ready module boundaries, API contracts, documentation, and agent workflows involving tool use and autonomous execution. Develop high-performance React applications, validate experiments with users, collaborate with product and design teams, own features through production, mentor engineers, and share engineering knowledge across the organization.

Build and maintain user-facing features and interfaces for Restream web services. Design and implement UI and business logic, collaborate with product designers and engineers, perform code reviews, improve reliability and scalability, and evaluate emerging technologies.

Design and implement complex customer-facing frontend features using TypeScript and React. Provide technical leadership, mentor junior engineers, drive frontend architecture and best practices, improve performance and accessibility, partner with product/design, integrate with backend APIs, and manage technical debt and scalability.

Seeking a Frontend Developer skilled in TypeScript and JavaScript, with experience in web development and 2D/3D graphics, to join our team.

Build and improve Restream’s web interfaces and user-facing features for the AI Clips team. Design UI and business logic, collaborate with product designers, participate in code reviews, improve system reliability, and evaluate emerging technologies. The role requires strong JavaScript and TypeScript expertise, advanced React knowledge, CSS preprocessor experience, and familiarity with backend development, cloud infrastructure, containers, and continuous deployment.

Design and build high-performance, mobile-first web applications and internal CMS/analytics tools. Own frontend architecture, reusable UI systems, and developer-friendly foundations. Optimize rendering, caching, and Core Web Vitals for high-load environments. Implement complex editors, forms, dashboards, and state-heavy interfaces with strong testing and observability practices.

Develop server-side applications using Kotlin and Java, collaborate with teams to enhance Atlassian plugins, and ensure code quality through testing and reviews.

Design and build scalable, accessible frontend applications for AI-driven Contact Center and UC products. Implement responsive interfaces with Angular/React, integrate with backend AI services (REST/GraphQL), optimize performance, participate in architecture and code reviews, and collaborate with cross-functional teams in an Agile environment.

As a Frontend Engineer, you will build and enhance frontend solutions for financial configurations, develop internal tools, and create customer-facing interfaces, ensuring high performance and quality in financial applications.

Full-Stack Engineer responsible for developing and maintaining front-end and back-end components, collaborating on product solutions, and improving user interfaces.

Design and implement developer-facing UI from Figma to production using Hotwire (Turbo + Stimulus) and ViewComponents. Own the dashboard, API playgrounds, docs, marketing site, and data visualization. Optimize performance and bundle size, maintain a coherent component system, and ship polished, production-ready front-end with tests and CI/CD.

Full-stack Developers at QuantCo build user interfaces for machine learning solutions, collaborating with data scientists and engineers to deliver actionable products.

Develop and maintain scalable front-end applications using AngularJS, integrate RESTful APIs, and collaborate with cross-functional teams while ensuring performance optimization and usability.