Upwork home
Sign up
Secondary

Hire the best JavaScript Developers in Lisbon, PT

Check out JavaScript Developers in Lisbon, PT with the skills you need for your next job.
Hire freelancers
Clients rate JavaScript developers
Rating is 4.7 out of 5.
4.7/5
based on 194 client reviews
  • $60 hourly
    • 5.0/5
    • (28 jobs)
    🏆 Top Rated React developer 🏆 6+ years of professional work experience 🏆 25+ successful projects 🏆 3000+ hours on Upwork 🏆 100% client satisfaction rating. Specialized in developing Web, Mobile and Hybrid applications. Experienced in working in both corporate and startup environments. Technical Summary; • Languages: JavaScript, TypeScript, HTML, CSS • Web Frameworks: NextJS, React (CRA), Gatsby • Mobile Technologies: ReactNative, Expo, • Design Frameworks: TailwindCSS, Styled-Components, SASS, Material-UI • Headless CMS: Sanity.io, Strapi, Netlify, Prismic • Other Tools: Redux, ContextAPI, Firebase, Supabase • Database: Firestore, Supabase, MongoDB, PostgreSQL • SDLC: Waterfall, Iterative, Agile (Scrum) • Version Control: Git, Bitbucket, GitLab Let's build a fast, scalable app, and grow your business together!
    Featured Skill JavaScript
    API Integration
    Redux
    Web Application
    Tailwind CSS
    Firebase
    Git
    Web3
    React Native
    Gatsby.js
    Next.js
    React
    Ecommerce Website
    HTML5
    TypeScript
  • $33 hourly
    • 5.0/5
    • (13 jobs)
    Greetings! Delighted to introduce myself as a Top Rated Plus Full Stack Developer, armed with an extensive eight years of hands-on experience in an array of cutting-edge technologies. My expertise spans across the realms of React, Next.js, Node.js, and an assortment of other libraries and frameworks meticulously honed over the years. In the dynamic world of front-end development, my proficiency shines through in React, offering seamless user experiences and dynamic interfaces. Additionally, with Next.js, I've mastered the art of building powerful, server-rendered React applications, ensuring optimal performance and scalability. On the server-side, my prowess in Node.js empowers me to craft robust, high-performance backend solutions, catering to diverse business needs. Alongside, my proficiency extends to various libraries and tools mentioned, enabling me to architect full-stack solutions with finesse and efficiency. With seven years of relentless dedication and hands-on experience, I bring a wealth of knowledge and expertise to the table, ensuring the delivery of innovative and top-notch solutions that exceed expectations. Let's collaborate and elevate your project to new heights! ✦ Let's delve into Areas of Expertise: On the client-side: Proficient in JavaScript, Typescript, Apollo-server, React.js, Redux, ReactNative, Next.js. UI component libraries: Skilled in Material UI, Rebass, React Bootstrap, styled-components, and react-storybook. On the Server-Side: Experienced in Node.JS, Express.js, and Graphql. Proficient in Web Markup: HTML/HTML5, CSS3, LESS, and skilled in PSD to HTML conversion (ensuring mobile responsiveness). DATABASES: Familiar with MongoDB and DynamoDB. ORM's (Object-Relational Mapper): Experienced in PostgreSQL, Sequelize, typeORM, and Mongoose. Third-Party API's Integration: Experienced in integrating Twilio, Google Map API, Socket.io, among others.
    Featured Skill JavaScript
    Storybook
    Full-Stack Development
    Front-End Development
    Next.js
    Redux
    iOS
    Android
    Node.js
    React
    TypeScript
    React Native
    GraphQL
    Mobile App Development
    MongoDB
  • $40 hourly
    • 5.0/5
    • (6 jobs)
    ⭐️⭐️⭐️⭐️⭐️ | Top Rated | Ex-EY & Accenture Digital Consultant | 100% Job Success Score Hi, I’m Alex! I blend clean, modern design to deliver flawless web apps, websites, and landing pages. With a background at EY and Accenture, I bring a consultative approach to every project, ensuring smooth communication and on-time delivery. What I Can Do for You: ✅ React Development: Build fast, responsive, and maintainable frontends using React and related frameworks. ✅ Landing Page Creation: Craft eye-catching, optimized landing pages that convert visitors into customers. ✅ UI/UX Best Practices: Design user-friendly interfaces that keep your audience engaged. ✅ Performance Optimization: Ensure your site runs quickly and efficiently for better user experience and SEO. ✅ Mobile Responsiveness: Make sure your pages shine on every device and screen size. ✅ AI Integration: Seamlessly integrate AI features into your projects to boost interactivity, streamline processes, and enhance overall user experiences. I’ve worked on and helped a startup raise over $200k, so I understand the firsthand challenges and opportunities business owners and entrepreneurs face. I believe in transparency and clear communication in all my work, ensuring we achieve your goals together. Looking forward to working together!
    Featured Skill JavaScript
    AI Model Integration
    AI App Development
    Web Application Development
    Figma
    Supabase
    Python
    User Experience
    User Interface Design
    CSS
    HTML
    Landing Page
    Material UI
    React
  • $50 hourly
    • 5.0/5
    • (9 jobs)
    Hi, I'm Andrey – a full-stack developer with 15+ years of experience in mobile, web, and cloud technologies. I develop end-to-end applications using Swift/Kotlin for mobile, React/TypeScript for web, and AWS for backend services. Working across the entire development stack helps me maintain consistent code quality and eliminate integration problems. My background spans multiple technical domains including embedded systems, graphics programming, and low-level systems development. Core Expertise: - Building native mobile and web applications with cloud backend integration - Managing software projects from initial architecture to deployment - Developing scalable systems with reliability and performance in mind - Adapting to new technologies and technical requirements Significant Project: As lead developer for a startup, I built a messaging platform for thousands of daily users. I developed: - Native iOS (Swift) and Android (Kotlin) mobile apps - React web frontend interface - AWS backend infrastructure with data storage The platform features included: - Text, image, and video messaging - User authentication and profiles - Push notifications across platforms - Secure data storage and transmission The system continues to operate with minimal maintenance, allowing the business to focus on growth. Technical Skills: - Mobile: Swift/SwiftUI (iOS), Kotlin/Jetpack Compose (Android) - Web: React, TypeScript, JavaScript - Backend: AWS (Lambda, API Gateway, S3, DocumentDB) - DevOps: Terraform, CI/CD pipelines - Additional: Firebase, Cloud Messaging, Algolia Search Specialized Experience Professional: - Embedded Systems: Developed GIS/mapping solutions with ARINC standards using C/C++ - Graphics Programming: Built OpenGL libraries and drivers for Radeon using C/C++ - Low-level System Development: Created performance-critical applications Personal Projects: - Computer Vision: Built a CNN-based detection system for a manicure app (2017) - Game Development: Created mobile games using C++ with SDL library - Blockchain: Developed smart contracts on Ethereum, TON, and Zilliqa platforms My Approach: I focus on delivering working solutions that meet business requirements. I've helped startups launch products on time and within budget, and I'm comfortable working independently on projects that span multiple technical domains.
    Featured Skill JavaScript
    ChatGPT API Integration
    DApp Development
    Prompt Engineering
    Artificial Intelligence
    Kotlin
    AWS Lambda
    Firebase
    Vue.js
    TypeScript
    Swift
    Java
    Python
    C++
    C
  • $40 hourly
    • 5.0/5
    • (24 jobs)
    Hey there 👋 Passionate techie here, diving headfirst into development for 10 years, fuelled by coffee and a love for code. I make it my mission to craft intuitive user interfaces, performance-driven solutions, and elegant code. My playground is .NET Core, Node.js, React, React Native, LLMs, Agentic AI, and more. I believe in transparency, so I expect detailed task lists and updates. Deadlines are sacred and clean, and I excel at maintainable code. Are you looking for a partner to create digital magic? Let's connect and transform your vision into reality!
    Featured Skill JavaScript
    AI Agent Development
    Machine Learning
    Mobile App Development
    Artificial Intelligence
    Node.js
    Mobile App
    React Native
    iOS
    Android
    API Integration
    React
    HTML
    API
    Web Development
  • $75 hourly
    • 5.0/5
    • (78 jobs)
    My name is Bibek. I am a Senior Front-End Developer with more than 15 years experience. My professional specialty is PSD-to-HTML conversion with using HTML5, CSS3 and JavaScript, Bootstrap and more. My #1 Goal will always be to meet your needs and deadline. Listed below are my experience and skills: - Experience with a JavaScript, jQuery and modern frameworks like React.js. - Solid understanding of CSS3 and HTML5 along with upcoming standards - Experience with Ionic - Experience with Grunt.js - Experience with a Sass and LESS Preprocessor - Experience with a Sass framework Compass - Experience with front-end frameworks (Tailwind, Bootstrap, Foundation) - Proficiency with Sketch, Adobe Photoshop and Illustrator - Able to translate wireframes and mockups into code with a good grasp of document structure and semantics - Good visual design sense and understanding of basic usability concepts - Solid understanding of cross-browser best practices - Pixel-perfect coding I am also an extremely hard-working, responsible and mature worker, who enjoys working in a team as well as autonomously. Sincerely, Bibek Rimal
    Featured Skill JavaScript
    Twitter/X Bootstrap
    Ionic Framework
    Vue.js
    React
    Sass
    jQuery
    Web Application
    CSS
    Responsive Design
    Zurb Foundation
    Grunt
    Git
    HTML
    LeSS Framework
  • $60 hourly
    • 5.0/5
    • (28 jobs)
    🚀 Turning your vision into scalable, high-performance digital solutions! 🏆 6 years experience | 2,500+ Upwork hrs | 25+ successful large-scale projects | Top Rated | 100% Client Satisfaction (JSS) | Proven track record & stellar client feedback! 🌟 Looking for a Full-Stack Team Leader who can turn your vision into scalable, AI-powered applications? I specialize in crafting robust backends, dynamic frontends, and intelligent integrations using modern technologies such as React, Node.js, and advanced AI frameworks. With 6 years of experience—and over 2,500 hours logged on Upwork across 25+ projects—I ensure that your web or mobile application is not only highly functional but also future-ready with cutting-edge features. What I Bring: Seamless Full-Stack Expertise: From creating responsive frontends with React and Next.js to building scalable backends with Node.js, Flask, and Laravel. AI and Chatbot Development: Integration of AI-driven features, including ChatGPT-powered chatbots for personalized user experiences and automation. Database Proficiency: Skilled in MySQL, Supabase, and MongoDB for scalable, secure, and efficient data solutions. Performance Optimization: Strong focus on speed, SEO, and responsiveness for exceptional user experiences. Blockchain Knowledge: Experience building dApps with Ethereum for cutting-edge decentralized solutions. Recent Achievements: Designed and deployed a social networking platform with AI-powered post recommendations, boosting user engagement by 40%. Built and integrated a ChatGPT-based chatbot for a customer support system, reducing response time by 60% and improving user satisfaction. Developed a full-stack e-commerce application using the MERN stack with intelligent product recommendations and real-time order tracking. Created a custom React-based dashboard for a global client, praised for its intuitive design and high performance. Skills & Expertise: 🔹Front-end: Proficient in ReactJS, Gatsby, Next.js, and React Native for crafting UI. 🔹Back-end: Solid understanding of NodeJS and ExpressJS. Flask, Laravel. 🔹Languages: Comfortable with JavaScript, Python, PHP, Typescript, HTML, and CSS. 🔹Design: Skilled in design libraries like Material UI and Antd for appealing interfaces. 🔹React Specialization: Expertise in Redux and Hooks for enhanced app performance. 🔹Database Handling: Experienced in managing MongoDB and Firestore. 🔹Content Management: Proficient in tools like Prismic, Strapi, etc. 🔹Technical Proficiency: Familiar with GraphQL, Webpack. 🔹Version Control: Proficient in utilizing Github, BitBucket, Gitlab. 🔹Cloud Capabilities: Able to leverage AWS to deploy scalable applications to the cloud. 🔹Interactive Preview: Creating interactive components using Storybook. 🔹Dev Tools: I always have Github Copilot backing me up to speed up development. Client Testimonials: "One of the best developers I worked with so far. Good work quality, communication and output. You would be a fool to skip on such a great candidate!" - Eugene, Shosho. "Maaz is an excellent communicator and his mastery of the English language is unparalleled by any other freelancer I have ever hired. He understands what the end result looks like and knows the pitfalls to avoid along the way. He is willing to go the extra mile and this is the reason I have hired him more than once and will rehire when the time comes." Ryan, Ninja Devs If you're looking for a developer who combines technical excellence, AI innovation, and user-centric design, let’s collaborate to create something extraordinary! 🚀
    Featured Skill JavaScript
    Node.js
    CSS
    HTML5
    TypeScript
    Tailwind CSS
    Web Application Development
    Responsive Design
    API Development
    Next.js
    Mobile App Development
    React Native
    React
    Front-End Development
    Full-Stack Development
  • $30 hourly
    • 4.9/5
    • (29 jobs)
    I specialize in Webflow development that blends pixel-perfect design with seamless functionality. With 130+ websites shipped, I craft custom, responsive sites that prioritize speed, usability, and brand identity—all built natively in Webflow. No bloated code. No compromises. Just clean, scalable solutions that convert visitors into customers. Why Choose My Webflow Expertise? End-to-End Webflow Builds: From concept to launch, I handle everything—design, development, CMS setup, and animations—directly in Webflow. Mobile-First & Responsive: Every site is optimized for flawless performance on all devices, ensuring 95+ Lighthouse scores. SEO-Ready Architecture: Built-in best practices for fast loading, semantic code, and metadata optimization to rank higher. Client-Friendly CMS: Customizable content hubs tailored to your team’s workflow, empowering easy updates. No-Code Interactions: Smooth scroll animations, hover effects, and dynamic content—all without sacrificing performance. My Webflow-Centric Process: Strategy: Align design with your business goals through UX research and wireframing. Design: Clean, modern UI crafted in Figma, then translated seamlessly into Webflow. Build: Development with reusable components, global swatches, and scalable structures. Launch: Rigorous testing for cross-browser compatibility, speed, and SEO readiness. Tools I Use to Amplify Webflow: Design: Figma (for seamless Webflow integration) Analytics: Hotjar + Google Analytics (to refine user journeys post-launch) Collaboration: Webflow Editor + Client-First CMS (for stress-free client handoffs) Let’s build a Webflow website that’s as clean under the hood as it is stunning on the screen. 🚀 130+ brands trust my Webflow expertise—ready to join them? Key Changes: Entirely Webflow-focused, aligning with the title. Highlighted technical strengths (Lighthouse scores, SEO, CMS). Streamlined offerings to emphasize Webflow’s native capabilities. Added metrics and outcomes to showcase expertise. Simplified tools section to prioritize Webflow and its ecosystem.
    Featured Skill JavaScript
    Airtable
    Google Analytics
    Website Copywriting
    Website Builders & CMS Consultation
    UX Research
    Mailchimp
    Content Management System
    On-Page SEO Report
    On-Page SEO
    Zapier
    UI/UX Prototyping
    Custom Web Design
    UX & UI
    HTML
    Web Design
    Webflow
    CSS
  • $25 hourly
    • 5.0/5
    • (8 jobs)
    I transform testing challenges into competitive advantages for tech-forward companies by implementing intelligent QA processes that scale with your business. As an Associate Member of the Portugal Software Testing Board and consistently Top-Rated Upwork professional, I bring enterprise-grade quality assurance to organizations seeking excellence. How I Create Measurable Value: Strategic QA Leadership I've helped startups and established companies reduce testing cycles by up to 60% while increasing test coverage by 40%, ensuring critical user paths remain defect-free during rapid development. Automation Excellence My custom test automation frameworks using Cypress, Playwright, and AI-enhanced testing tools have saved clients an average of 20+ engineering hours per sprint while delivering 3x more comprehensive test coverage. Risk Mitigation Expertise I've prevented costly production outages through meticulous security, performance, and compatibility testing strategies, protecting both revenue and reputation for companies across fintech, healthcare, and SaaS sectors. Technical Expertise: Test Automation Architecture: JavaScript/TypeScript, Cypress, Playwright, Selenium Comprehensive Testing: Functional, Regression, Security, Performance, Usability Mobile & Cross-Platform: iOS/Android app testing, Browser compatibility Enterprise Tools: JIRA + xRay/Zephyr, Postman, JMeter, TestSpirit DevOps Integration: CI/CD pipelines with GitHub Actions, Jenkins Business Systems: CRM integration testing, SAP module validation Why Partner With Me: ✓ Fast Onboarding: Self-managing professional requiring minimal supervision ✓ Clear Communication: Detailed reporting with actionable insights ✓ Enterprise Standards: Rigorous methodologies from years of experience ✓ Continuous Value: Proactive quality improvements beyond scope Let's discuss how strategic QA can accelerate your development cycles while ensuring exceptional product quality.
    Featured Skill JavaScript
    AI Model Training
    AI Platform
    API Testing
    QA Engineering
    QA Software & Testing Tools
    Quality Assurance
    Jira
    Cypress
    TypeScript
    Mobile App Testing
    Bug Tracking & Reports
    Web Testing
    Manual Testing
    Automated Testing
  • $25 hourly
    • 5.0/5
    • (3 jobs)
    🔹 6+ Years Experience | 100% Job Success 🔹 Scalable Web Apps | AI Chatbots | Custom MVPs | SaaS Development Hello! I'm Shahzad Ali Khan, a seasoned Full Stack Developer with over 6 years of experience building high-performance web applications, AI-powered tools, and scalable cloud solutions. I specialize in the MERN stack and modern AI integrations that automate, optimize, and elevate digital experiences. I've had the privilege to work with a wide range of startups and enterprises across the globe, from MVP launches to full-blown SaaS platforms. As a client-first developer, I focus on building secure, scalable, and intelligent systems that solve real business problems. ✅ What I Do Best 🧱 Full Stack Development (MERN): • React.js, Next.js, SvelteKit, Nuxt.js and Vue.js for blazing-fast UIs • Node.js & Express for REST APIs and backend logic • MongoDB schema design, Mongoose, and performance tuning • Real-time features using Socket.io and WebSockets • Firebase, JWT, OAuth for secure authentication 🧠 AI & LLM Integrations: Custom Chatbots using OpenAI / GPT-4 / Langchain Semantic Search with Vector DBs (Pinecone, Weaviate, ChromaDB) AI-enhanced SaaS tools (summarization, classification, decision engines) Agent-based workflows and AI automation pipelines ⭐ Why Clients Choose Me - Clear, prompt communication and proactive collaboration - Business-oriented problem-solving approach - Clean, modular, scalable codebases - Ongoing support & post-launch iterations - Focused on long-term product success, not just project delivery 🔧 Tech Snapshot React.js, Next.js, Node.js, Express, MongoDB, Mongoose, TailwindCSS, JavaScript, TypeScript, OpenAI, Langchain, Python, Docker, GitHub Actions, AWS, Firebase, PostgreSQL 💬 Let’s Build Something Great If you're looking for a reliable MERN stack developer who can also bring AI features into your product — whether it's an MVP, chatbot, internal tool, or production-grade platform — I’d love to connect. Send me an invite, and let's talk about how I can help bring your idea to life!
    Featured Skill JavaScript
    Firebase
    webpack
    UX & UI Design
    Web Component Design
    Tailwind CSS
    API Integration
    RESTful API
    Responsive Design
    Single Page Application Framework
    Front-End Development
    CSS 3
    HTML5
    TypeScript
    Svelte
  • $55 hourly
    • 4.9/5
    • (5 jobs)
    I am a software engineer with 10 years of experience in software development using J2EE and FE technologies. I have a background in building web services, scalable architectures, cloud technologies, and data management. Core experience: • Web Services, Microservices, REST APIs • Agile Scalable Architectures, High Load Systems, Cloud Technologies, Data Management • Java Performance optimization, Bottlenecks, Concurrency and Multithreading • Front-End, Mobile Application and Desktop Development • Agile Development, CI/CD practices, Security Compliance and more Key skills: • Java · Kotlin · Concurrency & Multithreading · JVM & GC tuning • Spring Framework · RESTful API · Security & OAuth 2.0 · SSL · DNS • Micro services · DigitalOcean · AWS · ActiveMQ · Kafka · RabbitMQ • MySQL · PostgreSQL · Oracle · MongoDB · Redis · Hibernate · CRUD & POJO • JS/TS · React · Angular · jQuery · Bootstrap · Thymeleaf · Websockets · SPA · Node.js · Vue.js • RCP · OSGi · EMF · Cross-Platform Apps · SWT • Financial Protocols: FIX, FIX 4.2, FIX 5.0, Arrowhead, Swift I’m proactive and self-motivated developer, energetic and driven by engineering challenges which add maximum value to company and users. I will gladly be a part of a professional team that values honesty and good-natured communication
    Featured Skill JavaScript
    Spring Framework
    SQL
    Cloud Architecture
    Hibernate
    Websockets
    NoSQL Database
    Multithreaded Programming
    CI/CD
    Java
  • $35 hourly
    • 5.0/5
    • (2 jobs)
    Hello, FullStack .NetCore/React Developer, looking to help you at building scalable and maintainable app. Background in Electronic Engineering but have been working in FullStack for about 3 years. I have good knowledge of the React ecosystem and most relevant libraries, to build an app from the ground up. Right now trying to focus on providing UI to replace business oriented problems, bringing things like interactive tables and data visualisation to replace excel workflows. Some of my experiences and knowledge: - Javascript/Typescript - ReactQuery, Zustand, Redux-Toolkit... - Css, Tailwind, clsx... - ReactHook-Form, Formik, Zod... -Nextjs -Any Rest API integration, Axios/Fetch, Odata. In my portfolio I have a complete diagram with all technologies we have worked on.
    Featured Skill JavaScript
    React
    Redux
    .NET Core
    TypeScript
    .NET Framework
    C#
  • $50 hourly
    • 4.9/5
    • (10 jobs)
    ❤️ Core Skills • Python: Proficient in Django, DRF (Rest Framework), FastAPI, and Flask. • Golang: Adept at leveraging Go for robust backend development. • JavaScript: Experienced in Angular, React, React Native, Next.js. • PHP: Skilled in Symfony and Drupal for versatile web development. • Ruby: Competent in building efficient applications using Rails. 👇 ❤️ I don't just write code, I'm a dedicated developer committed to delivering high-quality products and sustainable solutions. With a wealth of experience, I specialize in creating dynamic websites, mobile apps, CRM services, eCommerce platforms, and more, functioning seamlessly as both a backend and full-stack developer. ❤️ Expertise Across the IT Spectrum My expertise extends beyond coding. I possess a robust background in networking and adeptly handle server maintenance across platforms like AWS (ECS, RDS, EC2, ECR, S3, etc), Windows, Unix, and ESXi. Proficient in deploying applications using CI/CD (continuous integration and continuous delivery/deployment) methodologies and Docker, I ensure a smooth and efficient development lifecycle. ❤️ My commitment to producing quality products is reflected in my attention to detail and my ability to offer sustainable, supportable solutions. Let's collaborate to turn your ideas into reality!
    Featured Skill JavaScript
    Angular
    FastAPI
    PHP
    React
    Flask
    Golang
    Ruby on Rails
    Docker
    Django
    RESTful API
    React Native
    DevOps
    Linux
    Python
  • $85 hourly
    • 5.0/5
    • (1 job)
    Hello, my name is Filipa. I have been performing as a front and back-end web developer for 6 years and am still in the process of gaining more experiences through more years. My educational background possesses a Master’s degree in Software engineering. I am passionate of web development (front and back-end coding). I like to play with codes and results the best output from my work. I have mastered in web languages like the PHP, HTML5, CSS, SASS and JS. Over the last few years I have worked with the main technologies on the market for prestigious clients. Namely, Wordpress framework, Laravel, Tailwind CSS and Javascript frameworks. In the area of e-commerce also developed websites and applications for shopify and woocommerce As I have held important positions as a development team leader, it is very important to me that there is good communication in projects that are structured in a structured way. I can solve problems analytically and can face any complex situation with a motive of fixing it with total vividness. Also, I handle customers with a friend-like manner keeping myself within professionalism. So, I guarantee my enthusiasm in work and fulfilling my project with inexpressible efforts. Try me and you don’t have to regret.
    Featured Skill JavaScript
    ChatGPT
    PHP
    Laravel
    WordPress Customization
    Shopify
    Shopify Templates
    WooCommerce
    React Native
    WordPress Development
    Bootstrap
    CSS 3
    HTML5
    Web Application
    Tailwind CSS
  • $110 hourly
    • 5.0/5
    • (17 jobs)
    I help organizations design systems that think: automated workflows, intelligent feedback loops, and scalable data processes that drive clarity, efficiency, and real-world results. With 8+ years of hands-on experience, including 5 years at Qualtrics, I blend enterprise-level technical execution with strategic insight, building systems that don’t just function, but evolve with your business. Whether you're launching a customer feedback program, overhauling a manual process, or stitching data across tools, I bring a unique mix of CX, research, process improvement, and automation to deliver fast, clean, and lasting outcomes. 🧠 My Expertise Includes 🔹 Qualtrics System Architecture & CX Strategy From survey design to dashboarding, I specialize in CoreXM, CustomerXM, BrandXM, and Research Services, plus automation, closed-loop systems, and cross-platform integrations. 🔹 Workflow Automation & Integration I use automation platforms like Make.com, n8n, and Zapier to create seamless, no-code/low-code systems that eliminate manual work and reduce risk. 🔹 Process Optimization & Change Management I assess, map, and improve business processes using Lean and Six Sigma principles, embedding quality, speed, and clarity through structure and smart automation. 🔹 Market Research & Online Panel Management I design and run high-quality research at scale - crafting surveys, managing fieldwork, and delivering insights powered by AI and smart segmentation. 🔹 Data Strategy & Executive Reporting I build dashboards and reporting pipelines that turn data into decisions, using AI to summarize, segment, and flag what's important, when it matters most. ✅ Why Work With Me • Ex-Qualtrics: I’ve led global programs from the inside and know what enterprise excellence looks like • Full Stack Thinking: I design with strategy in mind - from UX and data quality to workflows and stakeholder adoption • Proven Results: $1.7M margin recovery, 120k+ contacts automated, 500k+ patient feedback records analyzed • Top Rated Plus: 100% Job Success | Fast, clear, accountable | Clients come back
    Featured Skill JavaScript
    CSS
    HTML
    API Integration
    Automation
    Make.com
    Survey
    Business Operations
    Market Research
    Business Strategy
    Project Management
    Customer Experience
    Process Improvement
    Qualtrics
    Data Analysis
  • $45 hourly
    • 4.9/5
    • (51 jobs)
    ✅ React Native Developer 10+ years of experience ✅ SaaS Mobile App Expert 5+ years ✅ 32 Mobile App Released ✅ React Native Mobile Expert ✅ Built 25+ UX-first Mobile App for 20 companies ✅ On-Time and Cost-Effective Delivery ✅ Future-Proof Solutions Showing a Minimum 42% ROI 🏄🏼‍♂️ I’m Mykyta, a dedicated Mobile App Developer with 5+ years of experience in SaaS Mobile App Development. Whether it’s building your app from the ground up or modernizing an existing product for iOS and Android, I’m here to help you craft scalable, intuitive, and cross-platform mobile applications. My solutions have contributed to 30%+ user retention growth and helped businesses scale to 100K+ active users. Let’s build something impactful together! 🚀 🏄🏼‍♂️As a Mobile App Developer and Full Stack Developer with deep expertise in SaaS Mobile App, React Native App I bring over a decade of experience in building high-performance cross-platform mobile application. Whether you're looking for a skilled Mobile App Designer or need assistance with Hybrid App Development, I have the right tools, strong background, and expertise to deliver outstanding products. 🏄🏼‍♂️I specialize in React Native development, crafting high-performance mobile app for both iOS and Android platform. As a Mobile App Developer, I leverage JavaScript and React JS to deliver user-friendly and scalable mobile app development solution, ensuring seamless performance and an exceptional user experience across all devices. ✔️ As a full stack developer, I can build an MVP SaaS mobile application from scratch—one that successfully raised $750k in the first seed round. ✔️ As a Flutter developer and React Native expert, I can redesign an app to boost downloads by over 30% within the first month. ✔️ I can transform an outdated application into a sleek, user-friendly product that became App of the Day on the App Store. ✔️ As a web developer, I help develop a custom business model to double your Gross Profit Margin (GPM). ✔️ I design user-centric mobile apps that have won Dribbble Awards for exceptional UX/UI. 💻 Core Strengths & Technologies React Native, Expo: For rapid, cross-platform development on iOS and Android, saving time and cost. Node.js, AWS: Secure, scalable backends that grow with your user base. API Integration: Experience with Stripe, PayPal, real-time data APIs, and push notifications. CI/CD Pipelines: Efficient, automated deployments to ensure your project stays on track. 🚀 MVP & Product Launch From feature planning to app store deployment, I’ll ensure a smooth launch and rapid market entry with: Clear Milestones & Rapid Iterations for quicker time to market. Robust Authentication and user management for secure access. High-Quality UX/UI to increase conversion rates and retain users. ⚙️ End-to-End Collaboration As a React native Developer, I specialize in React Native development, crafting high-performance mobile apps for both iOS and Android platforms. Architecture & Planning: Translating your idea into actionable plans, focusing on scalability and user-centric designs. Mobile App Developer Implementation: Prioritizing performance, reliability, and creating future-proof solutions. Post-Launch Support: Ensuring your app’s continuous evolution through seamless updates and ongoing improvements. 🤝 Why Partner With Me? Proven ROI: My work consistently delivers at least a 42% ROI for SaaS businesses. Speed & Reliability: With 32 successfully released apps, I showcase a dedication to on-time and cost-effective delivery. Collaborative Process: I value transparent communication, and my experience can help you double your GPM or secure critical funding for your product. Let’s build a Mobile Application that stands out, scales with your business, and creates an exceptional user experience. 📱 Platforms I Work On as a Hybrid App Developer iOS App Development Android Development SaaS Application Development ⚙️ Technologies: React Native, Flutter, Bubble, Kotlin, Expo.io, React, TypeScript, AWS, Firebase, React Native Firebase, React Native WebRTC, Ionic, Full Stack Development, Full stack Python, SaaS Development, React JS, JavaScript, React Native Expo Web Development: I’m also skilled in creating robust, modern web apps using Laravel, WordPress, Shopify, React JS, and JavaScript. Additionally, I can leverage my expertise as a Business Analyst, perform Data Scraping, develop with Python, integrate WebRTC for real-time communication, work with JSSIP protocols, After Effects Animator, provide FinTech consultant payment systems, and Roku developer app to expand your platform. Let’s collaborate to bring your Mobile App Development project to life. Contact me today to start planning your next SaaS mobile success story!
    Featured Skill JavaScript
    Redux
    Laravel
    Smartphone
    Hybrid App Development
    Mobile App Design
    Mobile App Development
    Firebase
    Web Design
    API Integration
    React
    Android App Development
    iOS Development
    React Native
    Android
  • $45 hourly
    • 5.0/5
    • (2 jobs)
    With over 4 years of experience in the blockchain industry, I specialize in creating decentralized applications (Dapps), tokens, NFTs, and DAO smart contracts. Collaborating with industry experts, I'm actively working on multiple projects. My dual proficiency in business and blockchain development enables me to offer a distinctive approach to projects. I merge my knowledge of market trends and user requirements with my technical skills to design and execute blockchain solutions effectively. I can assist you with: ⚒ Crafting and rigorously testing smart contracts, ranging from basic to advanced, with a keen focus on security and efficiency. ⚒ Analyzing and optimizing existing blockchain solutions. ⚒ Offering guidance on blockchain strategy, including use case identification and feasibility analysis. ⚒ Implementing security measures and audits to ensure the safety of your smart contracts. ⚒ Monitoring and maintaining your blockchain infrastructure for continuous performance. ⚒ And much more.. Let's work together to turn your blockchain ideas into reality. Whether you're starting a new project or need help with an existing one, my experience and skills are here for you.
    Featured Skill JavaScript
    C++/CLI
    Blockchain
    Solidity
    C
    Python
    TypeScript
  • $45 hourly
    • 4.9/5
    • (16 jobs)
    Expert-Vetted React developer and Web developer with 6+ years of experience in building efficient, reusable web application. My core expertise lies in React, Next.js, TypeScript, and modern front-end ecosystems. I specialize in helping startups and businesses create sleek, scalable solutions that deliver measurable impact. 🔧 Tech Stack & Skills As a React frontend developer, I craft highly performant and scalable apps, whether you're aiming for a Single Page Application (SPA), Progressive Web App (PWA), or full MERN stack solutions. Using frameworks like Tailwind CSS and Material UI, I focus on mobile-first development to ensure responsive websites. My stack includes: React.js, Next.js, React Native, React JS Developer, React JS Next JS Next.js Developer, Next.js Tailwind, Frontend React, Front-End React JavaScript, TypeScript, ReactJS TypeScript, ReactJS NodeJS Tailwind CSS, MUI, Material UI, React Tailwind, mui react MERN, MERN Stack Developer, MERN Stack NestJS, Laravel, Python Developer, Java Backend Developer Full Stack Developer, Full Stack JavaScript, Backend Developer UI UX Designer, Figma, Figma to React, Shadcn What I Offer as a React front end developer ✅ Full Front-End Development — From Figma to final product ✅ Custom Components — Built with Tailwind CSS, MUI, and Shadcn ✅ API Integration — REST, GraphQL, and React.js Node.js support ✅ CMS/DApp Front Ends — WordPress, Webflow, Strapi, and Dapp Front End ✅ Collaboration — Git, GitHub, GitLab + timezone-friendly for U.S. clients ✅ Performance-First — Using Vite, Webpack, NPM, and testing tools I'm a react frontend developer and frontend react expert passionate about building intuitive, responsive web interfaces. As a front end developer next.js, I focus on delivering fast, scalable, and maintainable products using the latest technologies. 📦 Build Tools: I prefer using Webpack, Vite, and NPM for fast and efficient project setups. 📦 UI Libraries: I ensure your site has a modern design with Material UI, Tailwind CSS, and custom styles. 📦 Mapping and Visualization: Leaflet helps me integrate maps or other data visualizations into your website. 📱 Mobile & Cross-Platform: I'm experienced with React Native Developer, Javascript developer, Flutter, Responsive UI, and mobile-first practices, ensuring your product looks perfect on every device. Whether you’re looking for a react next js developer, need someone with a react.js frontend background, or want a reliable react next js developer, I’m ready to help you bring your vision to life. 📈 Why Clients Choose Me • Flexible rates and timelines (weekends included) • Focused on code clarity and scalability • Quick project kick-offs and MVP delivery • Built for growth — from startup to enterprise I also work with modern content and eCommerce platforms to help businesses scale faster. As a Jamstack developer, I integrate headless CMS solutions like Strapi for lightning-fast websites. Whether you're looking for a Shopify developer to build a custom storefront or need a sleek marketing site in Webflow, I’ve got you covered. I also collaborate as a social media manager, aligning design and development with your brand’s online strategy. Additionally, I bring experience as a php full stack developer, combining backend efficiency with strong front-end skills. My approach is systematic and precise—qualities I’ve refined even through my background as a material engineer. My Working Style I offer flexible hourly rates, including weekends and holidays, with projects typically lasting two weeks or more. My focus is on writing clean, effective code to help your business grow📈 Let’s build something that works beautifully and grows your business. Ready to start your next project with a top-tier React nextjs and Reactjs developer? Let’s talk today!
    Featured Skill JavaScript
    WordPress
    Front-End Development
    Figma
    MongoDB
    Next.js
    PHP
    React Native
    Tailwind CSS
    Node.js
    TypeScript
    CSS
    React
    HTML5
  • $68 hourly
    • 5.0/5
    • (2 jobs)
    Experienced in both design and frontend development, I specialize in crafting websites for small businesses and startups. By blending creativity with technical expertise, I create effective online solutions that enhance brand presence and elevate user experiences. From building brand websites to showcasing products and services, I bring a holistic approach to every project, ensuring optimal results for my clients.
    Featured Skill JavaScript
    WordPress
    Elementor
    Web Application
    Web Design
    Landing Page Design
    Figma
    Tailwind CSS
    Next.js
    UI Graphics
    User Interface Design
    Web UI
    UX & UI
    Front-End Development
    TypeScript
  • $87 hourly
    • 4.9/5
    • (50 jobs)
    Developer of YumbleKids - Shark Tank Show Winner and Ziscuit - a grocery reverse auction that secured investments and spots in accelerators like Bronze Valley, Techstars Farm to Fork, and Velocity Accelerator. * Top Rated at Upwork * Among the Top at Clutch.co (SoftFormance agency) * Author "Web Development with Python and Django for Beginners" I can help you with 2 things: 1. Streamline your business processes with custom-built tools 2. Build & launch a SaaS product twice faster than any other dev team around As a Full-Stack Developer with 17+ years of experience, I specialize in backend and front-end development of complex web and mobile apps. Over last 5 years, I'm deeply involved in AI, Data Science and Machine Learning related projects. My skills include: -------------------- Machine Learning & AI: * AI Workflow Automation. (Use of tools like OpenAI, LangChain, Zapier/n8n + custom logic to automate business processes.) * Machine Learning Model Integration (Integrating pre-trained models or deploying custom models into real-world apps.) * Natural Language Processing (NLP) . (Chatbots, summarization, sentiment analysis, prompt engineering, etc.) * OpenAI / GPT API Development. (Building tools powered by ChatGPT, GPT-4, embeddings, and custom AI logic.) * AI-Powered SaaS Development (Applying AI to enhance SaaS platforms — insight generation, smart features, automation, etc.) Backend: * Python language; * Django/Flask web frameworks; * Zope/Plone CMS. Frontend: * Javascript, Angular & React.js * React Native for mobile apps development Databases: * Relational: MySQL, PostgreSQL; * NoSQL: MongoDB, Redis, Memcache, ZODB. DevOps: * AWS & Azure * DigitalOcean; * Docker & Kubernetes; I'm deeply involved in all my projects, from start to finish. I don't only do what I'm told to do, but I always run any requirements through my critical mindset and provide the best available solutions. I usually try to provide more than one option and show the pros and cons of each of the available options. I am 100% committed to maintaining my 5-star ranking. To me, anything less than complete customer satisfaction is unacceptable. I know happy clients are long-term clients. And this is what I strive for.
    Featured Skill JavaScript
    API
    AI Development
    UX & UI
    SaaS Development
    Project Management
    CRM Development
    Web Development
    Full-Stack Development
    Django
    Mobile App Design
    App Design
    React
    Python
    React Native
  • $100 hourly
    • 5.0/5
    • (21 jobs)
    Full-stack web developer. For the past 7 years I've been working on my own Shopify Apps which are still my main focus. Open for short term contracts now. * Ruby/RubyOnRails * Js/React/Vanilla
    Featured Skill JavaScript
    Web Service
    OAuth
    Front-End Development
    Payment Gateway Integration
    API Development
    RESTful Architecture
    Node.js
    Ruby on Rails
    Ruby
  • $50 hourly
    • 5.0/5
    • (8 jobs)
    I'm a professional, college-educated software developer with years of experience, particularly in Python and OpenERP/Odoo. I'm also well versed in the basics of server administration in Debian & Ubuntu, including deployment, service supervision, proxy layers, etc. I've built clients and servers using multiple protocols such as SOAP, XML-RPC and HTTP (REST) / JSON. I'm familiar with multiple relational databases, especially PostgreSQL, and I can also code in multiple languages, including JavaScript.
    Featured Skill JavaScript
    RESTful Architecture
    SQL Programming
    PostgreSQL Programming
    Unix
    Git
    System Programming
    Odoo Development
    Odoo
    Python
  • $50 hourly
    • 4.6/5
    • (12 jobs)
    I'm a geospatial engineer with +10 years of experience, working as full time and freelancer, which develops web solutions, for frontend and backend, and also working with mapping technologies. I specialize in frontend, oriented to mapping solutions, but I also work on non-mapping applications. I have worked for few companies (Esri, Dotgis, etc). My last job was at Dotgis where I worked with, and I co-led the frontend development of their current and future projects. As a freelancer, I have had several clients over the years. Also, I have done other jobs outside of the upwork platform, so not all of them are in my upwork portfolio. Right now, I work for GeoInsight, but I'm open to offers. My main expertise is frontend web development, by working with apps that involve JavaScript, Reactjs (I have a lot of experience with React). I specialize in web apps that involve geospatial data, but I'm also fully capable of building vanilla apps. I have also a full extended experience developing backend APIs using mostly NodeJs and Rust. I also have other broad range of technology and skill expertise, such as databases (postgres), GIS software experience and GIS/Remote Sensing analysis. As a plus, I have excellent knowledge in dealing and processing location based and satellite information, or any mapped information, so I understand and grasp geospatial concepts quite well. As you can see, I'm very versatile, since my background involves geospatial technology and web development. I'm really motivated, I can carry out goals under pressure, and I do not give up that easily. I have excelent knowledge in the following programming/mark-up languages: Javascript, HTML/CSS, SQL Other languages: Rust and Python. I have experience in the following technologies: Postgresql, Nodejs, ArcGIS/QGIS software, webpack, docker, REST APIs, git, and unit and integration tests. I have also knowledge in following JavaScript libraries/frameworks: Reactjs, Mapbox, Deck.gl, JavaScript ArcGIS API, Google Maps API, Leaflet, Open Layers, various other libraries that revolve around data and charts visualization.
    Featured Skill JavaScript
    Image Processing
    GIS
    Web Development
    ArcGIS
    Remote Sensing
    Scientific Computation
    Python
    SQL
  • $40 hourly
    • 4.9/5
    • (50 jobs)
    Top Rated on Upwork, with 10 years of experience specializing in back-end development, data scraping, and automation solutions. More than 50 happy clients. Problem solver, consultant. Technical skills Programming Languages: Python, JavaScript Frameworks: FastAPI, Django, Flask, Scrapy Databases & Search Engines: PostgreSQL, MySQL, MongoDB, Elasticsearch, Redis Message Brokers & Task Queues: RabbitMQ, Apache Kafka, Celery Google Cloud Platform / GCP: GCE, GCS, Cloud Run, Cloud SQL, BigQuery, Cloud Functions, Cloud Task, Pub/Sub, Memorystore, Cloud Logging Amazon Web Services / AWS: EC2, S3, Lambda, DynamoDB, RDS, SNS, CloudWatch Browser Emulation: Selenium, Playwright, Puppeteer, Multilogin DevOps: Docker, Jenkins, GitLab Testing: Unit/Functional/Load testing, Sentry, Logs.io, Apache JMeter, Browserless, Postman Visualisation: Kibana, Grafana, Looker studio AI tools: OpenAI, Gemini Other Expertise: ETL pipelines, high-load systems, proxy management, avoid bot detections, Zyte platform (ex Scrapinghub), telegram/slack bots development, reverse engineering Thanks for reading, I hope we will work together. I'll be glad to help!
    Featured Skill JavaScript
    Web Scraping
    Web Proxy
    Redis
    RabbitMQ
    PostgreSQL
    SQL
    Selenium WebDriver
    Flask
    Data Scraping
    MongoDB
    Docker
    Web Crawling
    Scrapy
    Python
  • $60 hourly
    • 5.0/5
    • (93 jobs)
    Attention business owners! Are you looking for a seasoned product designer and web wizard to take your online presence to the next level? Look no further! With over 7 years of experience, I have honed my skills in creating visually stunning and user-friendly digital experiences. My passion lies in designing intuitive UX/UI solutions that not only look great but also drive results. I have a talent for simplifying complex ideas and turning them into designs that make people go "Wow!" I am not just a designer; I am also a front-end developer who specializes in building websites and Webflow projects that perform flawlessly. I use JavaScript to add that extra touch of customization that is unique to your business needs. My goal is to help your business shine online, engaging users and driving conversions. I bring both creativity and technical expertise to the table, ensuring your project is a stunning success. Don't settle for a mediocre online presence. Let's discuss your project, and together we can turn your vision into a reality. Your business deserves to thrive in the digital world - let me help make that happen!
    Featured Skill JavaScript
    Web Design
    Sketch
    Framer
    UI/UX Prototyping
    HTML5
    Website Redesign
    Animation
    UX & UI
    CSS
    Webflow
    Sass
    Motion Graphics
    Product Design
    Figma
  • $100 hourly
    • 5.0/5
    • (5 jobs)
    Knowledge and will.
    Featured Skill JavaScript
    Firebase
    AWS CloudFormation
    Flutter
    Salesforce
    Serverless Computing
    Google Cloud Platform
    API Development
    AWS Lambda
    Python
    Laravel
    Node.js
    MySQL
    Amazon Web Services
    TypeScript
  • $35 hourly
    • 4.9/5
    • (11 jobs)
    Greetings, I am a dedicated Software Developer with a strong focus on Node.js and React, boasting a rich background spanning 4 years. My skill set is tailored to meet your diverse requirements, including: + Proficiency in delivering end-to-end website solutions. + Expertise in front-end development, ensuring a seamless user experience. + Adept handling of backend processes to empower your website's performance. + Skillful management of databases, encompassing both SQL and NoSQL options. + Familiarity with emerging technologies like React, Next.js, Express, and Nest.js. + Versatility across multiple programming languages, encompassing JavaScript, and TypeScript. + Diligent project maintenance and effective troubleshooting/debugging. For your forthcoming software projects, I offer a guarantee of satisfaction. Let's connect and discuss how I can contribute to your success.
    Featured Skill JavaScript
    PostgreSQL
    Next.js
    Full-Stack Development
    Back-End Development
    Illustration
    TypeScript
    Front-End Development
    React
    Node.js
    SQL
    NoSQL Database
    MongoDB
  • Want to browse more freelancers?
    Sign up

How hiring on Upwork works

1. Post a job

Tell us what you need. Provide as many details as possible, but don’t worry about getting it perfect.

2. Talent comes to you

Get qualified proposals within 24 hours, and meet the candidates you’re excited about. Hire as soon as you’re ready.

3. Collaborate easily

Use Upwork to chat or video call, share files, and track project progress right from the app.

4. Payment simplified

Receive invoices and make payments through Upwork. Only pay for work you authorize.

Trusted by

How do I hire a JavaScript Developer near Lisbon, on Upwork?

You can hire a JavaScript Developer near Lisbon, on Upwork in four simple steps:

  • Create a job post tailored to your JavaScript Developer project scope. We’ll walk you through the process step by step.
  • Browse top JavaScript Developer talent on Upwork and invite them to your project.
  • Once the proposals start flowing in, create a shortlist of top JavaScript Developer profiles and interview.
  • Hire the right JavaScript Developer for your project from Upwork, the world’s largest work marketplace.

At Upwork, we believe talent staffing should be easy.

How much does it cost to hire a JavaScript Developer?

Rates charged by JavaScript Developers on Upwork can vary with a number of factors including experience, location, and market conditions. See hourly rates for in-demand skills on Upwork.

Why hire a JavaScript Developer near Lisbon, on Upwork?

As the world’s work marketplace, we connect highly-skilled freelance JavaScript Developers and businesses and help them build trusted, long-term relationships so they can achieve more together. Let us help you build the dream JavaScript Developer team you need to succeed.

Can I hire a JavaScript Developer near Lisbon, within 24 hours on Upwork?

Depending on availability and the quality of your job post, it’s entirely possible to sign up for Upwork and receive JavaScript Developer proposals within 24 hours of posting a job description.

Looking to hire for long-term or full-time assignments? See how Full-time hiring on Upwork simplifies the process.