Hire the Best JavaScript Developers
in Portugal

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Rating is 4.7 out of 5.
4.7/5
Based on 194 client reviews
Kyrylo S.

Lisbon, Portugal

$40/hr
5.0
37 jobs

๐Ÿš€ Is your MVP taking months instead of weeks? ๐Ÿ’ก Tired of developers who donโ€™t understand your business and just write code? I help startup founders launch production-ready MVPs in ๐Ÿฎโ€“๐Ÿฏ ๐˜„๐—ฒ๐—ฒ๐—ธ๐˜€, using a clear, ๐—ฏ๐˜‚๐˜€๐—ถ๐—ป๐—ฒ๐˜€๐˜€-๐—ผ๐—ฟ๐—ถ๐—ฒ๐—ป๐˜๐—ฒ๐—ฑ development approach. As an Upwork Expert-Vetted React Front End Developer with a Masterโ€™s in Computer Science and 7+ years of experience building scalable SaaS platforms, dashboards, and custom APIs, I translate complex tech into clear product decisions that drive results. Iโ€™ve worked with startups from idea stage to Series B, as well as enterprise clients like ๐—ฆ๐—ฎ๐—บ๐˜€๐˜‚๐—ป๐—ด, ๐—›๐—ผ๐—ฟ๐—ถ๐˜‡๐—ผ๐—ป๐˜€, and ๐—•๐—ฒ๐—ป๐˜๐—น๐—ฒ๐˜† - always focusing on fast delivery, clean architecture, and measurable outcomes. ๐Ÿ’ฌ Clientsโ€™ Feedback: โ€œ๐˜Ž๐˜ณ๐˜ฆ๐˜ข๐˜ต ๐˜ฆ๐˜น๐˜ฑ๐˜ฆ๐˜ณ๐˜ช๐˜ฆ๐˜ฏ๐˜ค๐˜ฆ ๐˜ธ๐˜ฐ๐˜ณ๐˜ฌ๐˜ช๐˜ฏ๐˜จ ๐˜ธ๐˜ช๐˜ต๐˜ฉ ๐˜’๐˜บ๐˜ณ๐˜บ๐˜ญ๐˜ฐ! ๐˜๐˜ฆ ๐˜ฅ๐˜ฆ๐˜ญ๐˜ช๐˜ท๐˜ฆ๐˜ณ๐˜ฆ๐˜ฅ ๐˜ข ๐˜ฉ๐˜ช๐˜จ๐˜ฉ-๐˜ฒ๐˜ถ๐˜ข๐˜ญ๐˜ช๐˜ต๐˜บ ๐˜™๐˜ฆ๐˜ข๐˜ค๐˜ต + ๐˜›๐˜บ๐˜ฑ๐˜ฆ๐˜š๐˜ค๐˜ณ๐˜ช๐˜ฑ๐˜ต ๐˜ง๐˜ณ๐˜ฐ๐˜ฏ๐˜ต๐˜ฆ๐˜ฏ๐˜ฅ ๐˜ด๐˜ต๐˜บ๐˜ญ๐˜ฆ๐˜ฅ ๐˜ธ๐˜ช๐˜ต๐˜ฉ ๐˜›๐˜ข๐˜ช๐˜ญ๐˜ธ๐˜ช๐˜ฏ๐˜ฅ ๐˜Š๐˜š๐˜š, ๐˜ฃ๐˜ถ๐˜ช๐˜ญ๐˜ต ๐˜ธ๐˜ช๐˜ต๐˜ฉ ๐˜ค๐˜ญ๐˜ฆ๐˜ข๐˜ฏ ๐˜ค๐˜ฐ๐˜ฅ๐˜ฆ ๐˜ข๐˜ฏ๐˜ฅ ๐˜ด๐˜ต๐˜ณ๐˜ฐ๐˜ฏ๐˜จ ๐˜ข๐˜ต๐˜ต๐˜ฆ๐˜ฏ๐˜ต๐˜ช๐˜ฐ๐˜ฏ ๐˜ต๐˜ฐ ๐˜ฅ๐˜ฆ๐˜ต๐˜ข๐˜ช๐˜ญ. ๐˜Š๐˜ฐ๐˜ฎ๐˜ฎ๐˜ถ๐˜ฏ๐˜ช๐˜ค๐˜ข๐˜ต๐˜ช๐˜ฐ๐˜ฏ ๐˜ธ๐˜ข๐˜ด ๐˜ด๐˜ฎ๐˜ฐ๐˜ฐ๐˜ต๐˜ฉ ๐˜ข๐˜ฏ๐˜ฅ ๐˜ฅ๐˜ฆ๐˜ญ๐˜ช๐˜ท๐˜ฆ๐˜ณ๐˜บ ๐˜ฐ๐˜ฏ ๐˜ต๐˜ช๐˜ฎ๐˜ฆ - ๐˜ฉ๐˜ช๐˜จ๐˜ฉ๐˜ญ๐˜บ ๐˜ณ๐˜ฆ๐˜ค๐˜ฐ๐˜ฎ๐˜ฎ๐˜ฆ๐˜ฏ๐˜ฅ!โ€ โ€œ๐˜’๐˜บ๐˜ณ๐˜บ๐˜ญ๐˜ฐ ๐˜ฅ๐˜ฆ๐˜ญ๐˜ช๐˜ท๐˜ฆ๐˜ณ๐˜ฆ๐˜ฅ ๐˜ค๐˜ญ๐˜ฆ๐˜ข๐˜ฏ, ๐˜ด๐˜ค๐˜ข๐˜ญ๐˜ข๐˜ฃ๐˜ญ๐˜ฆ ๐˜ค๐˜ฐ๐˜ฅ๐˜ฆ ๐˜ข๐˜ฏ๐˜ฅ ๐˜ฉ๐˜ข๐˜ฏ๐˜ฅ๐˜ญ๐˜ฆ๐˜ฅ ๐˜ง๐˜ณ๐˜ฐ๐˜ฏ๐˜ต-๐˜ฆ๐˜ฏ๐˜ฅ ๐˜ฅ๐˜ฆ๐˜ท๐˜ฆ๐˜ญ๐˜ฐ๐˜ฑ๐˜ฎ๐˜ฆ๐˜ฏ๐˜ต ๐˜ธ๐˜ช๐˜ต๐˜ฉ ๐˜ฑ๐˜ณ๐˜ฆ๐˜ค๐˜ช๐˜ด๐˜ช๐˜ฐ๐˜ฏ. ๐˜Š๐˜ฐ๐˜ฎ๐˜ฎ๐˜ถ๐˜ฏ๐˜ช๐˜ค๐˜ข๐˜ต๐˜ช๐˜ฐ๐˜ฏ ๐˜ธ๐˜ข๐˜ด ๐˜ด๐˜ฎ๐˜ฐ๐˜ฐ๐˜ต๐˜ฉ, ๐˜ข๐˜ฏ๐˜ฅ ๐˜ฉ๐˜ฆ ๐˜ธ๐˜ข๐˜ด ๐˜ฑ๐˜ณ๐˜ฐ๐˜ข๐˜ค๐˜ต๐˜ช๐˜ท๐˜ฆ ๐˜ช๐˜ฏ ๐˜ด๐˜ฐ๐˜ญ๐˜ท๐˜ช๐˜ฏ๐˜จ ๐˜ต๐˜ฆ๐˜ค๐˜ฉ๐˜ฏ๐˜ช๐˜ค๐˜ข๐˜ญ ๐˜ค๐˜ฉ๐˜ข๐˜ญ๐˜ญ๐˜ฆ๐˜ฏ๐˜จ๐˜ฆ๐˜ด. ๐˜๐˜ช๐˜จ๐˜ฉ๐˜ญ๐˜บ ๐˜ณ๐˜ฆ๐˜ค๐˜ฐ๐˜ฎ๐˜ฎ๐˜ฆ๐˜ฏ๐˜ฅ๐˜ฆ๐˜ฅ ๐˜ง๐˜ฐ๐˜ณ ๐˜ธ๐˜ฆ๐˜ฃ ๐˜ฅ๐˜ฆ๐˜ท๐˜ฆ๐˜ญ๐˜ฐ๐˜ฑ๐˜ฎ๐˜ฆ๐˜ฏ๐˜ต, ๐˜ˆ๐˜—๐˜ ๐˜ช๐˜ฏ๐˜ต๐˜ฆ๐˜จ๐˜ณ๐˜ข๐˜ต๐˜ช๐˜ฐ๐˜ฏ, ๐˜ข๐˜ฏ๐˜ฅ ๐˜ฑ๐˜ฆ๐˜ณ๐˜ง๐˜ฐ๐˜ณ๐˜ฎ๐˜ข๐˜ฏ๐˜ค๐˜ฆ-๐˜ง๐˜ฐ๐˜ค๐˜ถ๐˜ด๐˜ฆ๐˜ฅ ๐˜ฆ๐˜ฏ๐˜จ๐˜ช๐˜ฏ๐˜ฆ๐˜ฆ๐˜ณ๐˜ช๐˜ฏ๐˜จ ๐˜ฑ๐˜ณ๐˜ฐ๐˜ซ๐˜ฆ๐˜ค๐˜ต๐˜ด.โ€ โ€œ๐˜๐˜ข๐˜ฑ๐˜ฑ๐˜บ ๐˜ธ๐˜ช๐˜ต๐˜ฉ ๐˜ด๐˜ฑ๐˜ฆ๐˜ฆ๐˜ฅ ๐˜ข๐˜ฏ๐˜ฅ ๐˜ฒ๐˜ถ๐˜ข๐˜ญ๐˜ช๐˜ต๐˜บ!โ€ Hereโ€™s what my clients value most: ๐ŸŽฏ Business-first mindset - I understand your priorities and align tech decisions with them โš™๏ธ Rapid MVP execution - from concept to launch in weeks, not months ๐Ÿงฉ Front End ownership - React, Next.js, API integrations, Tailwind, MUI and scalable architectures ๐Ÿงฉ Full Stack ownership - MERN, Express.js, Node.js, MongoDB ๐Ÿง  Strategic guidance - helping you define what truly matters for your first release I donโ€™t take on last-minute fixes or e-commerce stores - I focus on SaaS and MVP projects where clear product thinking makes the difference. If youโ€™re a founder looking for a reliable technical partner who speaks your language and delivers predictably - letโ€™s build something great together. ๐Ÿ› ๏ธ Tech Stack & Tools: โ€ข Languages & Libraries: React, React.js Node.js, JavaScript, ReactJS TypeScript, ReactJS NodeJS, Python, PHP, React Native, NextJS, MERN Stack โ€ข Styling: Material UI, Tailwind CSS, MUI React, custom SCSS / CSS โ€ข Build Tools: Webpack, Vite, NPM; โ€ข UI/UX: Figma, Frontend Design tools for pixel-perfect visuals; โ€ข Visualization: Leaflet, maps & data-driven charts. โ€ข Databases: MongoDB, PostgreSQL, MySQL, Firebase. โ€ข State Management: Redux, Zustand, RTK Query. โ€ข Cross-browser / cross-platform manual testing.

  • JavaScript
  • Node.js
  • React
  • CSS
  • TypeScript
  • Tailwind CSS
  • Next.js
  • MongoDB
  • Figma
  • Front-End Development
  • Software Development
  • Responsive Design
  • Full-Stack Development
  • Material UI
  • API Integration
Bruna M.

Salvada, Portugal

$5/hr
5.0
1 jobs

Iโ€™m a developer experienced in building websites for small and medium-sized businesses. Full project management from start to finish. Regular communication is important to me, so letโ€™s keep in touch. Knows: HTML5, CSS3, java script 5, APIยดs; Node.js, Jquery, SQL; express.js; React.js; Authentication; Firebase; Back end and front end development; Web design Any question, chat with me!

  • JavaScript
  • jQuery
  • Node.js
  • React
  • Web Development
  • HTML5
  • CSS 3
  • Bootstrap
  • ExpressJS
  • EJS
  • SQL
  • Back-End Development
  • API
  • Database
Yasser V.

Queluz, Portugal

$125/hr
4.9
99 jobs

Startups, enterprises and public-sector organizations bring me in when the product needs strong technical decisions, not just execution - production AI systems, SaaS platforms and fintech, from architecture to live deployment. Most engagements start with a fixed-price design phase that defines architecture, scope and roadmap, then convert into fixed milestones, so delivery stays structured and budget predictable. Rate $125-150/hr depending on complexity; most work is delivered as fixed-price milestones. What I specialise in: AI/LLM systems - RAG pipelines, multi-tenant AI assistants, agent orchestration, Claude/OpenAI integrations, structured outputs, eval pipelines. SaaS platforms - multi-tenant architecture, subscription billing, RBAC, admin backends, scalable APIs across web and mobile. Fintech/compliance - ACH, Stripe Connect, idempotent payment webhooks, audit logging, GDPR-compliant data. Govtech/regulated - transparency platforms, donor-funded compliance, multi-language reporting. Blockchain/Web3 - Solana smart contracts, SPL tokens, DeFi integrations. Selected results (live demos and links in the Portfolio section): Minerva (active production) - multi-tenant AI assistant platform architected end to end: organizations upload document libraries and deploy embeddable chatbots on their own knowledge base. Hybrid retrieval (BM25 + dense vector + semantic), Entra ID + RBAC + MFA, full tenant isolation, golden-query eval harness in CI. NestJS, Next.js, Azure OpenAI. Diginak.ai (active production, lead architect) - logistics document automation that auto-processes ~78% of inbound PDF/CSV/Excel with zero human touch; the remainder routes to human review with confidence scores. Claude API + tool use, state-machine workflow engine, retry/idempotency, 850+ automated tests. NestJS, PostgreSQL. Walletta AI Cashier (concluded May 2026, 5-star) - real-time voice agent with sub-500ms perceived latency. Claude + GPT-4o orchestration, structured tool calls with confidence-scored routing, persistent WebSocket, retry with circuit breaker. LiveKit, Deepgram, ElevenLabs, NestJS. Damen Capital Portal (concluded May 2026, 5-star) - loan-servicing portal for a private lender with the full ACH lifecycle: tokenization, NACHA returns R01-R85, HMAC-verified idempotent webhooks, append-only audit log, OAuth 2.0 + RBAC, scheduled reconciliation. NestJS + Fastify, Supabase. PulseYourBiz (active production) - all-in-one SaaS for service providers: bookings, payments, invoicing, CRM, analytics. Five-app Turborepo monorepo, Stripe Connect payouts, idempotent webhooks, React Native mobile. Docker + GitHub Actions. ProveYourImpact (production) - multi-tenant governance/compliance platform for donor-funded projects in PALOP countries: 20 API modules, 9-role RBAC, configurable workflow engine, audit log, EU/UNDP/World Bank report generators in four languages. NestJS, Next.js, PostgreSQL + RLS. Also shipped: no-code Solana token/DeFi platform with 1,500+ users (SwapForge), offline-first clinical decision support for underserved regions (ExtendYourClinic), multi-tenant VetSaaS with PostgreSQL RLS isolation (acti.vet), React Native apps live on both app stores (ForroAI). Tech stack: Backend: Node.js, NestJS, Python, FastAPI, REST, GraphQL. Frontend: React, Next.js, React Native, Expo, TypeScript, Tailwind. AI: Claude, OpenAI, RAG, pgvector, Azure Cognitive Search, structured outputs (Zod/Pydantic), prompt caching, tool use, eval harnesses in CI. Cloud: Azure (Functions, OpenAI, Entra ID, Key Vault, App Insights, Bicep IaC), AWS, GCP, Docker, GitHub Actions. Databases: PostgreSQL, MongoDB, Redis, Supabase, RLS tenant isolation. Blockchain: Solana, Anchor, SPL, Jupiter, Solidity, EVM. Working model: 25-30 hrs/week across a small number of parallel engagements. Best fit when the product needs architectural ownership - not a fit for quick fixes or one-off tasks.

  • Node.js
  • React
  • AI Agent Development
  • Generative AI
  • Retrieval Augmented Generation
  • Large Language Model
  • AI Consulting
  • NestJS Development
  • Next.js
  • React Native
  • TypeScript
  • Python
  • PostgreSQL
  • Software Architecture & Design
  • Stripe
  • Angular
  • Blockchain Development
  • Blockchain Architecture
  • DevOps Engineering
Manraj S.

Montijo, Portugal

$30/hr
4.8
106 jobs

Looking for an Expert WordPress Developer? I specialize in creating lightning-fast, SEO-optimized, mobile-responsive WordPress websites tailored to your brand and business goals. With a 100% Job Success Score on Upwork and over 50+ WordPress projects completed in the last 6 months, I deliver custom WordPress development, speed optimization, and scalable solutions for businesses of all sizes. Whether you need a custom WordPress theme, WooCommerce integration, or Figma to WordPress conversion, Iโ€™ve got you covered. โœ… What I Specialize In: Custom WordPress Development (ACF, Gutenberg, Elementor, WPBakery) Page Speed Optimization (GTmetrix, Google PageSpeed Insights) WooCommerce Store Setup & Customization Figma/PSD/HTML to WordPress Conversion On-Page SEO (Yoast, schema, alt-tags, semantic HTML) Website Redesigns & Responsive UX Security, Malware Cleanup & Backup Why Work With Me? ๐Ÿ”น Top-Rated Plus on Upwork โ€“ Trusted by global clients ๐Ÿ”น 100% Job Success โ€“ Proven reliability and quality ๐Ÿ”น End-to-End Delivery โ€“ From planning to deployment & optimization ๐Ÿ”น Fast Communication โ€“ Clear updates, on time WordPress Services Offered: ๐Ÿ› ๏ธ WordPress Theme Development โš™๏ธ Plugin Integration & Setup โšก Speed Optimization & Lazy Load Setup ๐ŸŽจ Elementor, Gutenberg & WPBakery Layouts ๐Ÿงพ ACF Pro for Custom Layouts ๐Ÿงผ Website Cleanup, Debugging, Bug Fixes ๐Ÿ”„ Migrations, Domain Transfers, Hosting Setup ๐Ÿ›’ WooCommerce Product & Checkout Customization ๐Ÿงฉ Page Builder Custom Layouts ๐Ÿงญ Technical SEO for Better Search Visibility Tools & Technologies: WordPress, PHP, HTML5, CSS3, JavaScript, ACF, Elementor Pro, Yoast SEO, GTmetrix, Google Search Console, MySQL, WP Rocket, WooCommerce Letโ€™s build something powerful together. Send me a message today and Iโ€™ll help turn your WordPress vision into a high-performing, SEO-friendly reality. โ€” Manraj Sandhu Top-Rated Plus WordPress Developer Other Skills: WordPress, WordPress website, WordPress developer, WordPress designer, WordPress expert, freelance WordPress developer, hire WordPress developer, custom WordPress developer, WordPress website developer, WordPress web developer, WordPress development services, WordPress design services, professional WordPress developer, experienced WordPress developer, affordable WordPress developer, WordPress full stack developer, WordPress frontend developer, WordPress backend developer, WordPress plugin developer, WordPress theme developer, WordPress customization expert, WordPress specialist, WordPress consultant, certified WordPress developer, best WordPress developer, WordPress developer for hire, WordPress website design expert, WordPress site designer, WordPress UI designer, WordPress UX expert, WordPress Elementor developer, WordPress Gutenberg expert, WordPress ACF developer, advanced WordPress developer, WordPress troubleshooting expert, WordPress speed optimization expert, WordPress SEO expert, WordPress eCommerce developer, WordPress WooCommerce developer, WordPress online store expert, WooCommerce WordPress expert, WordPress security expert, WordPress performance expert, WordPress mobile optimization expert, WordPress migration expert, WordPress API developer, WordPress API integration expert, WordPress REST API developer, WordPress front-end expert, WordPress back-end expert, WordPress support expert, WordPress maintenance expert, WordPress website builder, WordPress layout designer, WordPress CMS expert, WordPress bug fix expert, WordPress site repair expert, WordPress revamp expert, WordPress theme customization expert, custom WordPress designer, WordPress website revamp expert, responsive WordPress developer, WordPress child theme developer, WordPress hosting expert, WordPress multisite developer, multilingual WordPress expert, WPML WordPress developer, WordPress booking system expert, WordPress blog developer, WordPress landing page designer, WordPress contact form expert, WordPress speed expert, WordPress developer USA, WordPress expert UK, WordPress developer Australia, local WordPress developer, WordPress website freelancer, WordPress web design expert, WordPress redesign expert, WordPress clone developer, WordPress site transfer expert, WordPress backup and restore expert, WordPress theme developer for hire, custom WordPress theme expert, WordPress CSS expert, WordPress HTML expert, WordPress JavaScript developer, WordPress PHP developer, WordPress MySQL expert, WordPress analytics expert, WordPress conversion expert, WordPress ecommerce site developer, WordPress frontend designer, WordPress dashboard customization expert, and WordPress full site editing expert.

  • WordPress
  • WordPress Development
  • WordPress Website
  • WordPress Website Design
  • Elementor
  • Website Redesign
  • WordPress Landing Page
  • PSD to WordPress
  • WordPress Optimization
  • Ecommerce Website Development
  • WordPress e-Commerce
  • WordPress Bug Fix
  • WordPress Theme
  • Website Builder
  • Page Speed Optimization
Alice M.

Alenquer, Portugal

$25/hr
5.0
6 jobs

๐—›๐—ฒ๐˜†! ๐—œ'๐—บ ๐—”๐—น๐—ถ๐—ฐ๐—ฒ! I'm looking for opportunities to grow a freelance career and get more challenges through dynamic and inspiring jobs where I can improve myself and make cool things ๐Ÿงžโ€โ™€๏ธ I'm a versatile professional with experience in: โ€Ž โ–บ Node.js, React โ€Ž โ–บ HTML5, CSS3, jQuery โ€Ž โ–บ JavaScript, TypeScript โ€Ž โ–บ REST, GraphQL With both technical, and customer-focused background, I bring a unique perspective to projects. I understand the importance of user experience and customer satisfaction, and I strive to help turn ideas into reality that meet both technical requirements and end-user needs. I'm a dedicated professional who values collaboration, and with commitment to delivering high-quality work, I'm confident I can contribute to your projects! ๐—Ÿ๐—ฒ๐˜'๐˜€ ๐—ง๐—ฎ๐—น๐—ธ! ๐Ÿ––

  • JavaScript
  • jQuery
  • Node.js
  • React
  • CSS 3
  • HTML5
  • Web Development
  • Troubleshooting
  • Documentation
  • Testing
  • Technical Support
  • Customer Service
  • Email Support
  • Zendesk
  • Bug Reports
Vitor P.

Porto, Portugal

$40/hr
5.0
3 jobs

Hello. I am professional Rails & Laravel and Javascript developer with 20 years web experinece. My specialites: - Ruby on Rails: โœ” Munin, New Relic โœ” Resque, Sidekiq โœ” Elasticsearch, Sphinx โœ” Deploy with Capistrano, Mina or Heroku โœ” Chef, Amazon Web Services โœ” Testing: RSpec, Minitest, Capybara, Factory Girl, Spree, LocomotiveCMS - React.js โœ” Gatsby, React Saga, Mobx, Apollo GraphQL, Redux, Next.js, React Bootstrap, Material-UI, Grommet, Reactstrap, React Toolbox, Elemental UI - Angular.js โœ” Material2, NGX Bootstrap, Prime NG, NG Bootstrap, Onsen UI, Vaadin Components, NG-ZORRO, NG Lightning, NG2 Charts -Node.js โœ” express, body-parser, lodash, babel-core, async, Grunt, Socket.IO, Passport - Databases โœ” Relational Database ( MySQL / PostgresSQL ) โœ” Document-Oriented Databases ( MongoDB / CouchDB ) - Project Management โœ” Github, Bitbucket, Asana, Trello - Deploy Experience : โœ” Amazone Web Services / Heroku / Digital Ocean / Other VPS โœ” NGINX โœ” Capistrano / PM2 - Other skill โœ” Jenkins, Redis, Sidekiq, Elasticsearch, Google Apps services I guarantee honesty, punctuality and responsible approach to work, communication with clients, depth of knowledge, and the highest code quality are the areas of my expertise. I'll be glad to work with you.

  • JavaScript
  • AngularJS
  • Node.js
  • React
  • HTML5
  • Ruby
  • Vue.js
  • Ruby on Rails
  • RSpec
  • Capistrano

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