Top Front End Developer Jobs in Portugal

Build and maintain high-performance slot and casino game front ends using PixiJS and Svelte. Implement game mechanics, bonus features, UI flows, backend and RGS integrations, and responsive browser experiences. Optimize rendering, asset loading, memory usage, and mobile performance while collaborating with artists, animators, designers, math engineers, and QA to deliver polished, compliant, certification-ready games.

Develop and maintain the Investment Solutions frontend portal using TypeScript and modern web technologies. Write high-quality, tested, maintainable code; contribute to technical decisions, security, code quality, and technical debt reduction. Collaborate with engineers, designers, product owners, and business analysts, while mentoring team members and delivering user-focused features in an international environment.

Design, develop, deploy, integrate, maintain, and support low-code business applications using Mendix and SAP BTP. Translate business requirements into technical solutions, integrate applications with SAP and third-party systems, perform testing, document solutions, monitor performance, ensure security and quality, and provide technical expertise and mentoring. The role supports digital transformation within an Agile environment.

Develop and maintain frontend features using React and backend functionality using Python on the CAP platform. Support data pipeline development and data preparation, onboard new country and use cases, provide technical support, create environments, and participate in Agile squad rituals while collaborating with technical leads, product owners, and business analysts.

Own the frontend architecture and production delivery of a multi-brand consumer platform built with React, Next.js, and TypeScript. Responsibilities include creating a configurable multi-brand system, owning a design system and component library, converting AI-built prototypes into production features, using AI coding agents, and ensuring high UI quality, performance, accessibility, and Core Web Vitals. The role requires autonomous end-to-end ownership and daily production coding.

Leads and mentors a frontend engineering team while remaining hands-on with coding, architecture, code reviews, and technical delivery. Owns migration to Nuxt.js and server-side rendering, performance engineering, Core Web Vitals, and technical SEO. Manages team performance, career development, and work allocation while collaborating with product, backend, and cross-functional stakeholders to deliver scalable, high-quality software.

Develop frontend interfaces and A/B experiments for a health-focused AI product using Vue 3, TypeScript, and Vite. Improve design systems and AI-assisted development workflows, own features from concept through production, collaborate across engineering, design, product, and analytics, and optimize performance, reliability, and development velocity using user data and experimentation results.

Develop and maintain Keet Desktop, a cross-platform peer-to-peer communications application built with React and the Pear runtime. Responsibilities include implementing UI/UX, optimizing performance, writing maintainable and tested code, debugging complex frontend applications, and contributing to decentralized communication technology. The role involves collaboration within a remote global team and may include desktop application, real-time communication, and open-source development.

Develop and maintain Keet Desktop, a cross-platform peer-to-peer communications application built with React and the Pear runtime. Responsibilities include implementing UI/UX, optimizing performance, writing maintainable and tested code, debugging complex frontend applications, and contributing to decentralized communication technologies in a globally distributed remote team.

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.

Own frontend delivery for AI-powered mental healthcare products using a large Angular monorepo. Develop, test, and release patient-facing and internal applications; improve architecture, performance, platform health, CI/CD, and NX structure. Build interfaces for AI features and use agentic coding tools in daily development. Collaborate cross-functionally while occasionally working across SQL, backend endpoints, and APIs.

Lead the architecture and development of high-performance, secure, scalable frontend applications using React and Next.js. Establish testing strategies with unit, integration, end-to-end, TDD, and shift-left practices. Optimize Core Web Vitals, SEO, accessibility, and user experience while providing technical leadership, mentoring, and architectural direction within Agile Scrum or Kanban teams.

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.

Develop and own scalable React-based web products for Farfetch’s global marketplace. Responsibilities include architecting frontend solutions, delivering personalized experiences end to end, collaborating with Product, Design, and engineering teams, evolving design systems and open-source packages, and applying performance optimization, GraphQL integration, accessibility, SEO, and advanced testing practices.

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 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.

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.

Own the vision, roadmap, backlog, and delivery of API-driven frontend experiences in a headless architecture. Define user stories and API contracts, coordinate backend and architecture teams, steer external development partners, and ensure high-quality, scalable delivery. Champion user experience, Core Web Vitals, analytics, A/B testing, and modern frontend innovation across global brand websites.

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.

Design, develop, and maintain scalable Next/React front-end applications and API middleware. Lead architecture discussions, enforce code quality, write unit/integration/e2e tests, collaborate globally with engineers, product analysts, and architects to deliver performant, accessible user interfaces for Richemont's retail platform.

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.

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.

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.