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Hire the best React.js Developers in San Jose, CR

Check out React.js Developers in San Jose, CR with the skills you need for your next job.
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  • $22 hourly
    • 0.0/5
    • (3 jobs)
    Are you looking for a product that feels as good as it looks — and actually grows with your business? That’s what I help you create. I'm Matium, a Frontend Engineer and UX/UI Designer who combines clean code with thoughtful design to deliver real-world results. Over the past 4+ years, I’ve worked with brands like L'Oréal Paris and startups like Truflation (Silicon Valley), helping them launch digital experiences that users love and remember. Here’s what you get when we work together: - Designs that connect with your audience, not just impress them - Frontend development that’s fast, responsive, and scalable - A creative partner who cares about your success as much as you do Got an idea buzzing in your head? Let’s bring it to life.
    Featured Skill React.js
    Node.js
    Next.js
    Wireframing
    UI/UX Prototyping
    TypeScript
    Redux
    Storybook
    JavaScript
    API Integration
    CSS
    HTML
    Figma
    Angular
    React Native
    React
  • $95 hourly
    • 5.0/5
    • (14 jobs)
    Top-1% Talent vetted by Upwork Software Architect with 10+ years of software development experience, a deep understanding of the market and the latest technologies. Highlights: 📈>$1.2M saved with automations and custom software 📈20x Speed optimizations in business and software processes 📈 +90% accuracy achieved in Computer Vision systems 📈 10x ROI brought to Insurance Agency, saving +150 weekly hours I look to work with professional long-term minded people, to create great products and relationships together. About you: - You’re looking for highest-quality custom development or automation for your business or venture - You want someone who can to tackle your business and technical needs and transform them into results and growth - You have a long-term vision about your business and like to form productive and professional relationships About me: I've worked with 🏢 Big enterprise companies: Intel and Apple 💳 Fintech companies: Self.inc Financial 🛠 Hard-tech and IoT startups: Remora, Gridger, Mangrove 👨🏻‍💻 E-commerce and agencies Specialized In: - Generative AI Development (GPT-3, ChatGPT, OpenAI, HuggingFace) - Natural Language Processing (NLP, Text classification, summarisation, NER) - Backend development & Automation Systems - Computer Vision systems ------------------------------------------------------------------------------- – TECH STACK – Data 📄 - Storage: SQL, MongoDB, Vector DBs - Processing: Python, NumPy, Pandas, SpaCy AI 🤖 - Python Libraries: Scikit-learn, TensorFlow, PyTorch, HuggingFace, LangChain - Language Models: GPT, LLaMA, BERT, HuggingFace Low-Code ✏️ - Low-Code Development Platforms: Bubble, Botpress, Stack-AI, make, zapier Web Development 🌐 - Frontend Development: HTML, CSS, JavaScript, React - Backend Development: REST APIs, Python, Flask, FastAPI, Webhooks, serverless Infrastructure ☁️ - Cloud Services: AWS, Google Cloud, Digital Ocean - Containers & Orchestration: Docker, ECR -------------------------------------------------------------------------------- Ready for your next level? Hit the invite button for a free consultation worth $300+ today
    Featured Skill React.js
    Data Analysis
    Natural Language Processing
    Data Analytics
    Machine Learning
    Python
    React
    Full-Stack Development
    Software Architecture & Design
    Computer Vision
    Custom Web Design
    Web Development
    WordPress
    Web Design
  • $70 hourly
    • 5.0/5
    • (41 jobs)
    I help businesses scale and optimize their operations through advanced software engineering and cloud architecture. With over 15 years of experience delivering full-stack solutions, I have collaborated with clients across the US and Europe, consistently delivering high-quality, robust applications that meet business goals and exceed expectations. Core Services: • Full Stack Web Development: Building scalable web applications using modern frameworks. • API Development & Integration: Creating and integrating RESTful and GraphQL APIs for seamless service communication. • Cloud Architecture & DevOps: Designing scalable infrastructure, automated CI/CD, and serverless solutions. • Database Design & Tuning: Optimizing relational and NoSQL databases for peak performance and scalability. Technology Stack: • Languages & Frameworks: Go, TypeScript/JavaScript (Node.js, Vue.js, React.js), Python, PHP (Laravel) • Cloud Platforms: AWS, Google Cloud Platform, Firebase, Kubernetes, CloudRun • Databases & Caching: MySQL, MongoDB, CliudSQL, RDS, Redis, Memcached • Search & Indexing: Elasticsearch, Lucene, Sphinx Search Key Achievements: • Architected High-Traffic Platforms: Led a global team to scale a platform supporting 5M+ users, ensuring optimal performance. • Cloud & DevOps Expertise: Implemented AWS and Google Cloud solutions with serverless architectures and Kubernetes for seamless scalability. • Database Optimization: Enhanced database performance by through advanced data modeling and query optimization. Certifications: 📜 MIT Certification in Backend Development & Machine Learning 💡 Upwork Skill Certification in PHP Development Why Choose Me? I combine technical expertise with a strategic, business-oriented mindset, ensuring that every solution I deliver not only meets technical requirements but also aligns with business objectives. Whether you're looking to build a new product, optimize an existing system, or streamline your cloud infrastructure, I offer a unique blend of deep technical knowledge and proven leadership capabilities. Let’s connect and explore how I can help you transform your ideas into scalable, efficient, and high-performing solutions.
    Featured Skill React.js
    Google Cloud Platform
    API Development
    RESTful API
    Laravel
    MongoDB
    Amazon Web Services
    MySQL
    Redis
    HTML
    Vue.js
    JavaScript
    PHP
    Node.js
    React
    Python
  • $65 hourly
    • 5.0/5
    • (3 jobs)
    I am a software engineer and tech lead with 15+ years of experience in project management in different technology areas. 5+ years of experience as Javascript fullstack developer with a good list of projects to show. Those include edge JS technologies like: React, Node.js, Next.js, Websockets, MQTT, REST-APIs, Graphql, relational-DBs. I am also very interested in IoT and has been teaching Arduino in Latin America and Africa, Some of my strengths are: - Mature architectural thinking to consciously pick the best tools and approaches in the early stages of a project. That resulting in simple, modular and maintainable code. - Investing proper time in planning and wireframing in order to build a common vision of the project among stakeholders. - Positive attitude towards improvement and refactoring challenges to optimize code. - Always interested in both learning new things and teach/help others. My diverse background makes me the kind of leader that will always contribute with a 360º view to the analysis of any project. You can count on me as a player that always adds value to his team and faces difficulties with determination.
    Featured Skill React.js
    Redux
    Storybook
    OKTA
    Unit Testing
    Agile Software Development
    Next.js
    Lean Startup
    Arduino
    MQTT
    styled-components
    React
    ExpressJS
    JavaScript
    Socket Programming
    Node.js
  • $40 hourly
    • 0.0/5
    • (0 jobs)
    Launch the app you’ve always wanted. I'll design it. Develop it. Launch in two weeks. What you should Expect - Planning We will collaborate closely with your team to gather requirements, define objectives, and establish a clear roadmap for the project. - Prototyping I will create interactive prototypes to visualize the user experience and ensure alignment with your vision. - Development 2 weeks I'll build a robust and scalable software solution. - Launch & Handoff We will conduct thorough testing, ensure seamless integration, and provide comprehensive training to ensure a smooth transition and successful adoption.
    Featured Skill React.js
    Supabase
    Back-End Development
    Mailgun
    Front-End Development
    Software Development
    Vercel
    Web Development
    PostgreSQL
    React
    Tailwind CSS
    Next.js
  • $50 hourly
    • 3.1/5
    • (3 jobs)
    About me I am a person passionate about technology and programming. Every new challenge that I have I give my best and I like to be able to collaborate in whatever way I can. I like meeting new people because I can always learn something.
    Featured Skill React.js
    Docker
    RESTful API
    Vue.js
    DevOps
    Golang
    Laravel
    GraphQL
    Java
    PHP
    JavaScript
    Node.js
    Swift
    React
    React Native
    PostgreSQL
  • $35 hourly
    • 0.0/5
    • (0 jobs)
    I’m a Senior Software Engineer with 9+ years of experience building scalable web applications, specializing in cloud-native backends and high-performance frontends. I’ve worked with leading companies like Nissan and Walmart through Globant, and I bring solid expertise in technologies like TypeScript, NestJS, GraphQl, React, AWS, and PostgreSQL. 💡 What makes me unique? - I design systems with performance, scalability, and observability in mind. - I apply SOLID principles and industry-standard design patterns for scalable microservices architectures. - I work with CI/CD, infrastructure as code, and modern DevOps practices on AWS, Azure, and GCP. - I implement secure-by-design architectures based on OWASP best practices to protect against common vulnerabilities. - I care deeply about clean, maintainable code, automated testing, and an excellent developer experience. - I optimize Web Vitals on Angular and React applications to ensure fast, smooth, and accessible user experiences. Whether you're building a new product or optimizing an existing one — I can help you deliver solid, production-grade code. The following are some of my technology strengths: 👨‍💻 Front-End Development - Frameworks & Libraries: React, Next.js, Angular, Ionic (Android - IOS) - Styling: Tailwind CSS, SCSS, CSS - Languages: JavaScript, TypeScript, HTML - Performance: Web Vitals 🔧 Back-End Development - Frameworks: NestJS, Express.js, Fastify, GraphQL, gRPC, WebSockets - Languages: TypeScript 🗄️ Databases - Relational: PostgreSQL, MySQL, MariaDB - NoSQL: MongoDB, Redis - Principles: ACID - ORMs: TypeORM, Prisma ✅ Testing - Unit Testing - Integration Testing - Performance Testing ☁️ Cloud & DevOps 🟡 AWS: - SQS, SNS, Lambda, CloudWatch, S3 - Elastic Container Service (ECS), EC2 - Secrets Manager, API Gateway 🔵 Azure: - Queue Storage, Service Bus, Functions - Monitor, Blob Storage, Container Instances - Virtual Machines, Key Vault, API Management 🔴 Google Cloud (GCP): - Cloud Tasks, Pub/Sub, Cloud Functions - Cloud Logging, Monitoring, Storage - Cloud Run, Compute Engine, Secret Manager, API Gateway 🚀 CI/CD - GitHub Actions - GitLab CI - Jenkins 📊 Observability - Structured Logging: Pino, Winston - Monitoring: Grafana, Prometheus, Splunk - Query Language: PromQL Let’s build something awesome together! 💻✨
    Featured Skill React.js
    React
    AWS CloudFormation
    CSS
    Node.js
    Mobile Development Framework
    Angular
    Ionic Framework
    CI/CD
    Relational Database
    Web Development
    HTML
    TypeScript
    MongoDB
    GraphQL
    Git
  • $17 hourly
    • 5.0/5
    • (3 jobs)
    Are tight deadlines and overwhelming workloads slowing down your web projects? Let me step in and lighten the load. With extensive experience in React.js, Next.js, and other frontend technologies, I help teams deliver sleek, functional, and scalable web applications. If you're looking for a reliable partner to turn your vision into a reality or simply need extra hands to push your project across the finish line, let’s connect! 1. Responsive Web Design and Development 2. Custom UI/UX Design Implementation 3. Create websites and web apps from scratch with ReactJS/NextJS 4. Cross-Browser Compatibility Optimization 5. Integration of APIs and third-party services 6. Conversion of Figma or Sketch Designs to HTML/CSS 7. Performance Optimization for faster loading times My attention to detail, passion for creating pixel-perfect sites, and dedication to staying up-to-date with the latest web technologies ensure that your project is in capable hands. I'm excited to take on new challenges and deliver top-notch results for your web development needs. Let’s get started – message me today!
    Featured Skill React.js
    MongoDB
    ExpressJS
    Node.js
    TypeScript
    JavaScript
    Bootstrap
    Tailwind CSS
    Sass
    CSS 3
    HTML
    UX & UI
    Next.js
    React
    Front-End Development
    Web Development
  • $50 hourly
    • 0.0/5
    • (3 jobs)
    I'm a Senior Front-End Developer with ample experience building websites of all sizes and types. Whether you're looking for a simple portfolio website for your services, sell your products online or just announce yourself to the world, I can help you make your ideas into a reality. Here's what I can do for you: - Build simple HTML/CSS pages or use either React or Angular to set up a more complex project structure. - Use Design Thinking to get to know your users and then turn their ideas and needs into an actual website - Lead a group of front-end developers or even assist back-end developers with architecture
    Featured Skill React.js
    PHP
    API Development
    Angular 4
    MySQL
    GraphQL
    NodeJS Framework
    Handlebars
    CSS 3
    Next.js
    React
    JavaScript
    Front-End Development
  • $60 hourly
    • 0.0/5
    • (0 jobs)
    Is your application outdated, slow, or hard to maintain? I help businesses upgrade their tech stack and streamline their systems without breaking their current operations. I help businesses future-proof their applications so they stay scalable, maintainable, and built for growth. The Core Technologies I manage include: Java, Spring, Python, Flask, FastAPI, NodeJS, React, Database development, CI/CD, Containerization, Test automation I have vast expertise in application development and modernization, using the latest technologies and best practices. I have led teams transitioning applications from the early 2000's to modern stacks including Java, Python, Angular, React and AWS among others. This modernization help the customer applications to keep evolving, increasing security, performance and having better feedback during audits. All this let operators focus on other tasks increasing the company revenue. Let’s talk about how to upgrade your app with minimal downtime. Message me to get started.
    Featured Skill React.js
    QA Automation
    CI/CD
    Next.js
    React
    REST API
    Database Architecture
    Scrum
    Spring Boot
    FastAPI
    Flask
    Artificial Intelligence
    Web Application
    Product Development
    Java
    Python
  • $55 hourly
    • 0.0/5
    • (0 jobs)
    Senior Software Engineer | Full-Stack Expert | Cloud & Scalable Architecture Specialist I'm a results-driven Senior Software Engineer with over 15 years of experience delivering robust, scalable, and high-performance software solutions for enterprise and startup clients. I specialize in full-stack development, cloud infrastructure, and distributed systems, bringing both technical expertise and strategic thinking to every project. Core Technical Skills: Backend: .NET (C#), Java, Node.js, Python. Frontend: React, Angular. Cloud Platforms: AWS, Azure (certified & production-grade experience). Architecture: Microservices, Event-Driven Systems, Distributed Systems. Databases: SQL Server, PostgreSQL, Oracle, MongoDB, Redis. DevOps & Automation: Docker, Kubernetes, Jenkins, GitLab CI/CD, Terraform. API Development: RESTful APIs, GraphQL, OAuth2, JWT. Testing: TDD, Unit Testing, Integration Testing (xUnit, Jest, NUnit). Security: OWASP standards, Identity Management, Data Protection. What I Bring to Your Project: - Proven ability to design and implement scalable systems from the ground up - Clean, maintainable, and well-documented code following SOLID and Clean Architecture principles - Agile project execution (Scrum/Kanban) with cross-functional teams - Strong focus on performance, security, and end-user experience - Excellent communication, leadership, and mentoring skills Who I Work With: CTOs, Product Owners, and Startups needing technical leadership or MVP delivery. Enterprise clients modernizing legacy applications or building cloud-native solutions. Teams looking for a reliable, senior engineer to drive architectural decisions and coding best practices. Let's connect to discuss how I can bring value to your project or organization.
    Featured Skill React.js
    Angular
    Software Design Pattern
    React
    Spring Boot
    C#
    CSS 3
    HTML
    SQL
    Python
    Node.js
    JavaScript
    Java
    AWS Development
    .NET Core
  • $36 hourly
    • 0.0/5
    • (0 jobs)
    I’m a Businnes System Analist experienced in building websites for small and medium-sized businesses. I have experience with ERP applications, I sknow Back End and Front End systems. I can help with creation new application agree to align with goals of bussinnes, I can made new changes of systems and fix problem. Knows HTML5 and CSS3, Bootstrap, React js, .net framework, .net core, Rest API, Oracle Database, Oracle Apex, Oracle forms and reports, Weblogic, Java, C#. Regular communication is important to me, so let’s keep in touch.
    Featured Skill React.js
    SQL
    Point of Sale & Payment Systems
    JavaScript
    Java
    Bootstrap
    React
    REST API
    HTML5
    Oracle Database
    Oracle Reports
    .NET Core
    C#
    Oracle Forms
    Oracle APEX
    Web Application
  • $8 hourly
    • 0.0/5
    • (0 jobs)
    Currently, I work as a consultant, focusing on developer tooling and infrastructure, with background interest in cloud technologies, distributed systems, and web applications. I enjoy seeking out creative solutions to complex problems and building things that empower others to do the same.
    Featured Skill React.js
    Full-Stack Development
    React
    Web Scraping
    Cloud Computing
    Linux
    Git
    Microservice
    DevOps
    Node.js
    JavaScript
  • $12 hourly
    • 5.0/5
    • (1 job)
    Hello! My name is Andrés Vargas and I live in San José, Costa Rica. I'm a hard working, honest individual, always willing to learn new skills. Lately, through online learning I've discovered the amazing world of web development. I'm now looking for an junior dev position or an internship, so I can start my career and learn among professionals.
    Featured Skill React.js
    Next.js
    CSS
    HTML
    React
    JavaScript
    Tailwind CSS
    Front-End Development
  • $35 hourly
    • 0.0/5
    • (0 jobs)
    I’m a developer experienced in building websites for small and medium-sized businesses. Whether you’re trying to win work, list your services, or create a new online store, I can help.
    Featured Skill React.js
    Babel
    gulp
    ExpressJS
    Node.js
    SQL
    Git
    GSAP
    Angular
    PHP
    React
    Vue.js
    Bootstrap
    HTML
    JavaScript
    Web Development
  • $35 hourly
    • 0.0/5
    • (0 jobs)
    Versatile software engineer with 5+ years of experience across software development and business strategy. I bring a unique mix of technical depth and systems thinking, shaped by my early work designing automation machinery and sharpened through full-stack development in fast-paced product teams. Often called the "Swiss knife" of the group, I'm at my best when wearing multiple hats - whether it's writing clean code, translating business needs into user flows, or rallying a team around a shared goal. I thrive on turning ideas into action, solving problems with creativity and purpose, and helping teams move forward with clarity and momentum.
    Featured Skill React.js
    Cloud Architecture
    Solution Architecture
    Product Development
    Web Application
    React
    Ruby on Rails
    Web Development
  • $30 hourly
    • 0.0/5
    • (0 jobs)
    I'm a Frontend Developer with over 3.5 years of experience building modern, responsive, and performant web applications using React, TypeScript, and Node.js. I also bring 14+ years of experience as a QA Engineer, which means I naturally deliver clean, tested, and bug-free code with attention to detail. I can help you with: - Building React components from scratch - Fixing UI/UX bugs and optimizing performance - Migrating projects from JavaScript to TypeScript - Integrating APIs and building frontend logic - Improving code quality and maintainability I work well independently, communicate clearly, and always meet deadlines.
    Featured Skill React.js
    Web Component
    QA Testing
    Python
    Tailwind CSS
    API Integration
    TypeScript
    React
    Quality Assurance
    Web Development
  • $6 hourly
    • 0.0/5
    • (0 jobs)
    Soy ingeniera en sistemas con enfoque en desarrollo web. Me especializo en crear aplicaciones y herramientas digitales que optimizan procesos internos, automatizan tareas repetitivas e integran APIs externas para mejorar la eficiencia operativa. Utilizo tecnologías modernas como React, Node.js y bases de datos relacionales y NoSQL. También aplico buenas prácticas de diseño responsivo, accesibilidad y seguridad web. He desarrollado soluciones personalizadas para equipos técnicos y administrativos, combinando funcionalidad con una experiencia de usuario clara y eficiente. Mi objetivo es construir productos web que resuelvan problemas reales y aporten valor desde lo visual hasta lo estructural.
    Featured Skill React.js
    HTML5
    Clean Architecture
    Figma
    Node.js
    Spring Boot
    Java
    User Authentication
    REST API
    Python
    Responsive Design
    React
    JavaScript
    Scrum
    Web Development
    Angular 10
  • $15 hourly
    • 0.0/5
    • (0 jobs)
    I’m a web developer with experience in React, TypeScript, Node.js, and Java. I specialize in helping small and medium-sized businesses build custom websites and applications that are fast, scalable, and user-friendly. I can assist you with: • Developing modern and responsive websites • Building custom web apps from scratch • Improving performance and functionality of existing sites • Integrating APIs and backend services • Offering technical guidance and full project support Tech stack: React, TypeScript, Node.js, Java, Firebase, and more. With 6+ months of freelance experience, I value clear and regular communication to ensure your project runs smoothly and delivers real value.
    Featured Skill React.js
    FlutterFlow
    Node.js
    Java
    Tailwind CSS
    React
    Software Development
    Scrum
    Spanish
    English
    Web Development
    Product Development
    Web Application
  • $16 hourly
    • 0.0/5
    • (0 jobs)
    Front End Web3 Engineer with expertise in React, Svelte, and Next.js, specializing in building scalable, high-performance user interfaces for decentralized applications. Passionate about integrating Web3 technologies to deliver seamless blockchain experiences, with a strong focus on responsive design, performance optimization, and innovative front-end solutions.
    Featured Skill React.js
    API Development
    NestJS
    Decentralized Exchange
    Web API
    API Integration
    Web3
    Firebase
    Supabase
    Svelte
    SCSS
    Tailwind CSS
    Next.js
    React
  • $8 hourly
    • 0.0/5
    • (0 jobs)
    Hi! I'm José Pablo, a frontend and full stack developer specializing in React, Next.js, and TypeScript. I lead real-world projects like the Municipality of Nandayure’s frontend and my own app, Shrinkily. I stand out for: Building high-performance, secure web architectures with modern tools like SWR and Prisma. Delivering polished, responsive UI/UX experiences using Tailwind CSS and component libraries. Leading and deploying real production systems with a focus on scalability and maintainability.
    Featured Skill React.js
    Clean Architecture
    Responsive Design
    TypeScript
    Auth0
    React
    Vercel
    Strapi
    Tailwind CSS
    Next.js
    Web Development
    Web Application
    Product Development
    International Development
    Ecommerce Website
    Ecommerce
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