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 improve a high-volume, mobile-first checkout experience supporting global payment flows, methods, currencies, and languages. Responsibilities include integrating payment SDKs, improving web performance and stability, analyzing product data and experiments to increase conversion, investigating production issues across frontend and backend systems, and contributing to technical decisions and code quality.

Build and own production-quality React features for SIXT’s web booking funnel. Translate ambiguous product problems into testable specifications, guide AI agents through guarded workflows, review and debug their output, and ship medium-to-complex features end-to-end. Develop reusable components, integrate with backend systems, ensure accessibility, cross-browser compatibility, and frontend performance, and collaborate with Product and engineering teams on architecture and delivery.

Build high-performance, data-dense financial UIs with React and TypeScript, including virtualized grids, real-time views, reusable MUI components, and accessible workflows. Architect Node.js/TypeScript Backend for Frontend services, integrate backend APIs, optimize web performance, and collaborate with product, design, engineering, and business stakeholders. Contribute to AI-assisted development, legacy application migration, and agent-enabled user experiences.

Lead frontend architecture and implementation for Easyship’s customer-facing platform using React.js, TypeScript, and Vite. Drive reusable patterns, code quality, performance, scalability, testing, and technical roadmaps. Mentor engineers, conduct architectural reviews, collaborate cross-functionally, and leverage AI-assisted development tools. The role includes advancing micro-frontends, Server Components, and engineering processes across a global remote team.

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 responsive frontend applications using TypeScript, integrate APIs and services, implement UI/UX designs, optimize performance and scalability, apply frontend security and data protection practices, troubleshoot issues, participate in code reviews, and contribute to open-source privacy-focused projects.

Lead the migration from Svelte to React, shape frontend architecture and design systems, improve performance, accessibility, testing, developer experience, and UX quality across teams. Guide cross-team initiatives, establish engineering standards, mentor senior engineers, influence technical direction, and advance effective agentic AI development practices. Translate complex product workflows into scalable, maintainable user experiences while collaborating with Product, Design, Engineering, and leadership.

Build and maintain scalable, highly available frontend applications using React and Redux. Collaborate with UX designers, develop Google Looker Studio dashboard widgets, contribute to Agile requirements and architecture, and leverage GCP, CDN, and NoSQL technologies. Own production code, including on-call support and troubleshooting, while documenting solutions and ensuring performance, reliability, and operability.

Own Restate’s frontend product experience, building fast, accessible, secure interfaces for monitoring durable workflows and distributed systems. Develop data-intensive timelines, charts, filtering, search, live updates, client state, and shared components. Collaborate directly with design, engineering, and founders from concept through production. Improve performance, usability, testing, information design, and safe handling of untrusted content while contributing to API and backend discussions when needed.

Build and improve high-quality web products and reusable design-system components. Own frontend performance, including data loading, caching, server rendering, and streaming. Apply strong product judgment to complex UX problems and collaborate with designers, engineers, and product leaders. Work autonomously across products, establish frontend quality standards, and help elevate team practices through technical leadership and craftsmanship.

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.

Build and maintain frontend-leaning, full-stack Creative and Studio products using React and Next.js. Develop AI interfaces, UX/UI workflows, proof-of-concept products, integrations, and end-to-end features. Collaborate with Design, Engineering, Growth, and Sales; iterate based on user feedback; maintain scalable, secure infrastructure; process large datasets; and mentor less experienced engineers. The role emphasizes strong portfolio work and demonstrated software engineering ability rather than formal degrees or certifications.

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.

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.

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.

The Staff/Lead Fullstack Engineer will enhance the Mimica Webapp by architecting scalable UI components, managing large datasets, and optimizing performance while collaborating with cross-functional teams.

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.

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.