Hire the best JavaScript Developers in San Jose, CR

Check out JavaScript Developers in San Jose, CR with the skills you need for your next job.
  • $35 hourly
    Figma, AdobeXD, Sketch, Photoshop HTML5, CSS (Scss, Less, Sass), Bootstrap, TailwindCSS, Bulma Javascript, AngularJS, Angular, TypeScript, ReactJS, NextJS, VueJS, jQuery, GraphQL PHP (MVC/OOP), ASP.NET MVC (C#), JAVA WordPress, Headless WordPress with Next.js * Responsive Design * Cross Browsing (IE7 +, Edge, Chrome, Firefox, Safari) * Git
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    Adobe Experience Manager
    Bootstrap
    Tailwind CSS
    HTML5
    CSS 3
    Vue.js
    Next.js
    React
    Angular
    Material UI
    Ember.js
  • $80 hourly
    I have strong experience in the information technology industry working with distributed agile teams. Software Engineer with excellent understanding of software technologies, software development practices/tools, backend, frontend, Database development, data integration, including the full SDLC, source control and production support. Technical skills: .NET,. NET core, ASP.Net, REST, Web API, MVC, EF, C#, JSON, XML, HTML5, JavaScript, Git, Data development and manipulation, relational and NoSQL databases, Microsoft SQL certified, SQL Server Integration Services, Data warehouse modeling, Data mining, Machine learning, Azure DevOps, Azure suite of tools, MongoDB , R, R-Studio.
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    Software
    ASP.NET
    Back-End Development
    TypeScript
    C#
    API Development
    Kendo UI
    .NET Framework
    SQL Server Integration Services
    SQL
  • $35 hourly
    Professional in custom system implementations for local and international clients. Lead and work with teams of professionals to meet customer needs. Design and develop applications and modules from scratch. Offer a new user experience for the CRM product with constant updates to keep the product on top. Experience in corporate sales with software products and services.
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    HTML
    Engineering & Architecture
    Web Service
    API
    Web Application
    PHP Script
    Web Page
    Automation
    PHP
  • $40 hourly
    ✔️ 100% Job Success Rate on Upwork ✔️ 10+ Years of Expertise ✔️ Client-Backed Reputation I am a qualified and professional web developer with a killer instinct for design. I create memorable digital experiences that captivate and inspire your target audience. More than just a beautiful website, I'll design and develop your digital real estate to perform great, be responsive across all devices, have a user friendly focus and follow industry best practices. My experience covers over 10 years in web development, design, SEO, e-commerce and digital marketing. 🏆 You can expect : • A professional attitude • Attention to detail • Excellent communication • Flexibility, fast response and delivery • Patience and reliability throughout your project • Design solutions and ideas to improve your site I will work with you until we get things right where you want them to be. 🗣️ Languages : • English (fluent) • Spanish (native) • Portuguese (tamo junto) 🎯 Skills : • Front-End Development • UI/UX Design • HTML, CSS, Javascript • Responsive Design [Mobile | Tablet | Desktop] • Copywriting • Search Engine Optimization (SEO) • Graphic Design • Logo Design ⚙️ Frameworks : • Webflow • WordPress: Divi, Elementor, OptimizePress, WPBakery, Oxygen Builder • WooCommerce • Shopify: PageFly • Squarespace • Wix 🧰 Tools : 🖌️ Figma, Adobe (XD, Photoshop, Illustrator), Sketch, Zeplin ☑️ ClickUp, Asana, Monday, Trello, Hubspot 💬 Slack, WhatsApp, Zoom, Google Meets 🌐 WP Engine, Flywheel, SiteGround, Cloudways, SpinupWP 📋 Gravity Forms, Contact Form 7, Typeform, Google Forms 📊 Google Search Console, Google Analytics, Screaming Frog 🎥 Loom ✍️ Notion 📮 Beehiiv, ConvertKit, MailChimp 🔳 Gamma.app 🔐 LastPass ⏳ Toggl ✅ Services provided : • Responsive Web Design & Development • Website Redesign • Website Maintenance • Brand Guideline + Logo Design • Website Migration 
• Website Speed Optimization • Image Optimization • SEO Audit + Setup • Content Creation • Web Hosting, Cloud Server, CDN and DNS management 
• Domain name purchase and configuration e.g. www. YourWebsiteName .com • Business Email Setup I genuinely wish to provide help, value and empathy where needed. Hope we can work together soon 😁 Have any questions for me❓ Let's talk! ☕
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    Web Design
    Figma
    Search Engine Optimization
    Copywriting
    Ecommerce
    UX & UI
    Front-End Development
    WooCommerce
    CSS
    HTML
    WordPress
    Elementor
    Divi
    Webflow
  • $36 hourly
    I am passionate about software development...it’s not just my career, it’s my hobby. I have more than 18 years of experience. I'm based in Costa Rica, Central America; one of the most educated countries in the whole of Latin America. I'm constantly striving to learn new things and improve. I DO follow industry news, regularly tinker with new technologies, and read books and blogs to keep my skills current. - I work well alone or within a team environment and enjoy working with my colleagues. - I always use GitHub to keep track of my code and push commits daily - I am fluent in English and Spanish and I'm learning German as a third language, I always write documentation for the code I write and comments. Please, feel free to contact me and let's discuss further details of your projects.
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    jQuery UI
    .NET Core
    Google APIs
    MVC Framework
    Firebase
    API Development
    jQuery
    ASP.NET Web API
    C#
    ASP.NET Core
    ASP.NET MVC
    SQL
    ASP.NET
    .NET Framework
  • $45 hourly
    Software Engineer / Full stack / Front End Specialist An extremely motivated and ambitious software developer, fast learner, and dedicated individual. Proficient as a fullstack developer; mainly with React Js and Redux and other Javascript variations such as LitElement, Svelte, Typescript. Knowledgeable in back end using Node Js and have extensive experience with Postgresql. Able to learn and perform in various software languages as well as when facing challenges. Willing to learn and adapt to company's metrics. Good communication skills, efficient on teamwork-based projects and following orders.
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    Bug Fix
    Agile Project Management
    Redux
    RESTful API
    Agile Software Development
    Software Debugging
    Git
    MySQL
    MongoDB
    CSS
    Node.js
    React
    HTML5
    JSON
  • $50 hourly
    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.
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    Docker
    RESTful API
    Vue.js
    DevOps
    Golang
    Laravel
    GraphQL
    Java
    PHP
    Node.js
    Swift
    React
    React Native
    PostgreSQL
  • $50 hourly
    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
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    PHP
    API Development
    Angular 4
    MySQL
    GraphQL
    NodeJS Framework
    Handlebars
    CSS 3
    Next.js
    React
    Front-End Development
  • $10 hourly
    Customer Service Technical Support Data Analysis Team Oriented Troubleshooting Processes Investigation Skills Critical Thinking LANGUAGE English C1 - C2 (Advanced) LESCO (Basic) ABOUT ME I'm thrilled to achieve my goals as a software developer entrepreneur for apps and new services related with AI. I'm passionate and discipline about my hobbies and different projects that I visualize in my career path. First, I want to graduate and as soon as I finish I will like to continuing on developing my craft on apps services.
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    Critical Thinking Skills
    Communications
    TypeScript
    Technical Support
    Customer Service
  • $70 hourly
    As a senior software engineer with 10+ years of experience building and designing web solutions my goal is to figure out what is the best tailored solution for your business. This are my main areas of expertise: - Web development using the latest React based frameworks like NextJS and Qwik - Mobile development using React native - Serverless backends using AWS - Agile methodology to expedite software development - Vast experience modeling with Autodesk Fusion 360 to create product prototypes - Basic electronics and PCB design experience
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    Autodesk Fusion 360
    3D Model
    Serverless Stack
    Amazon Web Services
    React
    Node.js
    Golang
    Python
  • $45 hourly
    I'm a software developer with a knack for problem-solving. I thrive on learning new technologies and embracing challenges. My proactive approach and quick adaptability enable me to tackle complex projects with confidence and efficiency. I'm dedicated to technical excellence and constantly seek opportunities to enhance my skills and knowledge.
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    Solidity
    Blockchain
    Windows Server
    CSS 3
    ASP.NET Core
    Microsoft Access
    React
    HTML
    Web Development
    Visual Basic
    Rust
    Python
    SQL
    C#
  • $60 hourly
    I am a passionate software engineer with a geek spirit and a constant learning mindset. From my immersion in blockchain technology to my daily life as a developer, I am always looking for new opportunities to grow and improve. Ready to conquer the digital world with my passion and my code!
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    Python
    React
    PHP
  • $40 hourly
    I am a seasoned Digital/Email Marketing Specialist with a rich background in crafting visually compelling email templates and executing successful campaigns. In a previous role at Wunderman Thompson, I further refined my email marketing skills, utilizing Adobe Campaign to craft targeted emails. I specialized in creating workflows to seamlessly connect emails with specific target audiences, ensuring precision in campaign execution. Additionally, I played a key role in implementing A/B testing and designing complex campaigns. At Cheetah Digital, I honed my skills in HTML/CSS, creating bespoke email templates based on client specifications. My expertise extends to developing intricate audience criteria, managing campaigns from basic to advanced levels, and implementing dynamic content, A/B testing, and detailed reporting.
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    CSS
    Search Engine Optimization
    Digital Marketing
    Query Language
    SQL
    Database Administration
    Data Analysis
    Salesforce
    Figma
    HTML5
    A/B Testing
    HubSpot
    Klaviyo
    Email Marketing
  • $45 hourly
    I‬‭ am‬‭ a‬ Software‬‭ Engineer‬‭ with‬‭ over‬‭‬‭ 12‬‭ years‬‭ as‬‭ a Web‬‭ Developer‬‭ .‬‭ I‬‭ have‬‭ worked‬‭ as‬‭ a‬‭ Frontend‬‭ Developer‬‭ and‬ Full-Stack Developer‬‭ building‬‭ Single Page Applications‬‭ and‬‭ Progressive Web Apps‬‭ for small, medium, and large-sized businesses. Whether you are planning to start a project or already have an application up and running, I can help. These are my main tech skills and stacks that I have the most experience with: ‭‬React‬‭ .js (+7 years)‬, Vue‬‭ .js (+6 years)‬, Javascript‬‭ (+12 years)‬, Typescript‬‭ (+6 years)‬, Node‬‭ .js with‬‭ Express‬‭ .js (+6 years)‬, MERN‬‭ stack (+6 years)‬, MEVN‬‭ stack (+5 years)‬, SPA‬‭ (+8 years)‬, PWA‬‭ (+5 years)‬, AWS Amplify, Lambda, S3‬‭ (+4‬ years)‬, DigitalOcean‬‭ (+3 years)‬, Heroku‬‭ (+2 years)‬, SVN,‬‭ Git‬‭ ,‬‭ GitHub‬‭ , GitLab, Bitbucket‬‭ (+10 years)
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    MEVN Stack
    MERN Stack
    CI/CD
    Scrum
    React Native
    HTML5
    SCSS
    Git
    Nuxt.js
    TypeScript
    Amazon Web Services
    Web Application
    Vue.js
    React
  • $27 hourly
    As a dedicated and experienced Front-End Developer, I specialize in creating dynamic and user-friendly websites and web applications. With a strong background in HTML, CSS, and JavaScript, I possess the expertise to transform design mock-ups into pixel-perfect, responsive interfaces. I am passionate about delivering exceptional user experiences through the implementation of cutting-edge front-end technologies and frameworks. Skills: Front-End Development: Proficient in HTML, CSS, and JavaScript, I have a deep understanding of web development principles and best practices. I have the ability to create clean and maintainable code, ensuring compatibility across different browsers and devices. Responsive Design: I have expertise in responsive design techniques, allowing me to create interfaces that adapt seamlessly to various screen sizes. By utilizing media queries and a mobile-first approach, I guarantee an optimal user experience across all platforms. Front-End Frameworks: I am experienced in working with popular front-end frameworks like React, Angular, or Vue.js. Leveraging these frameworks, I build efficient and scalable web applications, utilizing reusable components and advanced state management techniques. UI/UX Implementation: With a keen eye for design and a thorough understanding of user experience principles, I excel at translating design concepts into intuitive and visually appealing interfaces. I ensure that every element of the user interface enhances usability and maximizes engagement. Cross-Browser Compatibility: I am well-versed in testing and ensuring cross-browser compatibility for websites and web applications. By conducting comprehensive browser testing and utilizing compatibility tools, I deliver a consistent experience across different platforms. Performance Optimization: I prioritize performance optimization techniques to create fast-loading websites. By optimizing code, minimizing file sizes, and implementing caching mechanisms, I enhance page load times and overall site performance. Collaboration and Communication: I am a strong communicator and work effectively in collaborative environments. I actively participate in discussions, provide valuable insights, and ensure smooth coordination with designers, back-end developers, and project stakeholders. Problem-Solving and Debugging: I possess excellent problem-solving skills and have a knack for debugging. I am adept at identifying and resolving issues quickly and efficiently, ensuring the smooth functionality of websites and applications. By hiring me as your Front-End Developer on Upwork, you can expect a dedicated professional who is committed to delivering high-quality results. I am passionate about creating visually appealing and user-friendly interfaces that exceed client expectations. With my technical expertise and strong collaboration skills, I am well-equipped to contribute to the success of your web development projects.
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    Adobe After Effects
    PSD to WordPress
    PSD to HTML
    HTML5
    CSS
    HTML
    WordPress
    Sass
    jQuery
  • $60 hourly
    I'm a 100% bilingual Full Stack and Automation Engineer with over 20 years of experience working with US-based companies. I've done mostly Web Development, REST APIs, QA lead, Test Automation and DevOps-related tasks, like deployment and provisioning automation. Regarding Web Development, I specialize in Wordpress, PHP and Java, and I have thorough experience integration with 3rd party APIs, like payment gateways and social media sites. I also focus on the client project as a whole thing, and not only as a development project, so I will suggest and encourage usage of web analytics, cloud based solutions and anything I can do to help your business succeed. Regarding QA and Test Automation, I have experience as QA Manager, handling teams of QA Engineers, and I have successfully implemented test automation frameworks for ECommerce and SaaS applications. These frameworks were based on Selenium WebDriver, using Java, TestNG and Maven. In addition to this, I have implemented internal Selenium Grids, using virtual machines and Docker containers, that supported up to 60 concurrent tests, executed by a Jenkins job. This enabled a suite of almost 300 regression tests to run in under 15 minutes, enabling the development team to run full regressions on the sites multiple times per day. I'm more than happy to offer you my services, so I'm always willing to be contacted for an interview. I'll be thrilled to be a part of your projects!
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    Project Management
    Selenium WebDriver
    Selenium
    PHP
    HTML5
    Java
    WordPress
    CSS 3
  • $20 hourly
    Hi! My name is Andres Saurez, I'm a very curious and proactive person. I got my major in Mechanical Engineer, and I'm self-taught in computer science mostly through online courses. I have worked as a front end and back end software engineer. I have experience in Python, Java, Javascript, and Scala from the programming side, and knowledge in AutoCAD, SolidWorks, Fusion 360 and Ansys, from the mechanical engineer part. I've made web scraping programs, web pages, machine learning models, data mining, data analytics, and robotic projects, among others, but most of them were from personal projects. I've also created some drone designs, designed a concrete pump alongside its economic and mechanical analysis, among other projects
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    Microservice
    Vue.js
    3D Design
    3D Modeling
    CFD Analysis
    SolidWorks
    Spring Boot
    NumPy
    Python
    Scala
    Java
    OpenCV
  • $12 hourly
    I'm a React Developer with 1 year of developing React.js/Firebase/MongoDB full stack applications. I have in-depth knowledge in JavaScript/Typescript and Next.js, experienced in responsive websites and that heavily interact with APIs like CRUD applications that run on local global state or server state. For managing state, my main technologies are: Redux Toolkit (Local global state) Zustand (Local global state) - preferred React Query (Server side state) - preferred -I'm experienced in HTML, CSS, JavaScript, Typescript, React.js, Next.js, Redux, Zustand, React Query, Firebase and MySQL. I am data driven from my industrial engineering background, which also gave me project management experience and understanding of methodologies like Agile. My communication capacity is excellent, we will keep in touch so that we are always aligned on our goals. As a developer, something I always do is learning, so if there is something I don't know, I am capable of learning and delivering great quality of work.
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    HTML5
    CSS 3
    Material UI
    Next.js
    MySQL Programming
    Node.js
    Google Ads
    React
    Paid Media
    GitHub
    MySQL
  • $25 hourly
    I'm a former lawyer who found her passion in Web Development. Excellent design skills and attitude always willing to bring 110% to the table. Great customer treatment and an eager learner, with great desire to gain experience. - Excellent HTML, CSS and JS experience - Front End framework knowledge (React) - Back End technologies experience (Node, express, SQL and MongoDB) - Great communication skills
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    MongoDB
    Web Design
    Web Development
    GitHub
    Agile Software Development
    Bootstrap
    ExpressJS
    TypeScript
    SQL
    HTML
    Git
    Node.js
    React
    CSS
  • $20 hourly
    Hi I am a software developer with 4 years of experience working in many industries. I have knowledge in aws as well
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    Spanish to English Translation
    English to Spanish Translation
    Web Design
    Translation
    Transcript
    Node.js
    AWS Lambda
    Angular
    React
  • $17 hourly
    I am a developer experienced in building websites and online stores for businesses of any kind. If you are trying to get your website up and running rapidly, optimized and with the latest technologies, I am your go-to.
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    REST API
    TypeScript
    API Integration
    Node.js
    React
    Tailwind CSS
    Next.js
    Web Application
  • $20 hourly
    Hi there! I'm a Web Developer with a keen interest in building effective web solutions. While I'm early in my career, I've already worked on several small projects that have helped me develop key skills in creating websites and web applications. What I Bring to the Table: - Web Development: Proficient in HTML, CSS, JavaScript, React, Tailwind, and Astro to create attractive and functional websites. - Basic SEO Optimization: Knowledgeable in basic SEO practices to improve your site's visibility on search engines. - Commitment and Learning: Focused on understanding your needs and working closely with you to deliver a product that meets your expectations. I'm dedicated to continuous learning and skill improvement. Why Choose Me: - Attention to Detail: I strive for excellence by paying close attention to every detail of the project to ensure high-quality results. - Open Communication: I believe clear and consistent communication is key to project success. I'm always available to discuss progress and make necessary adjustments. - Personalized Approach: Although I'm a junior developer, I aim to provide a personalized service tailored to your specific requirements. I'm excited to collaborate on your next project and bring my enthusiasm and skills to help you achieve your goals. Let's connect and create something amazing together!
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    SEO Performance
    Web Development
    Git
    Landing Page
    CSS
    HTML
    Tailwind CSS
    React
    Front-End Development
  • $12 hourly
    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.
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    Next.js
    CSS
    HTML
    React
    Tailwind CSS
    Front-End Development
  • $20 hourly
    I have experience in both black-box and white-box testing. I used to test web interfaces and different API. For web testing I worked with Selenium bindings in Python, JS and Java (both vanilla Selenium and Selenide). Beside of QA, I have some experience in development of micro-services in Spring and frontend in React. My tech stack includes Java, JavaScript, TypeScript, Python, Selenium and TestCáfe, SQL and noSQL (mongo) databases.
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    Quality Assurance
    API Development
    Web Application
    API
    Web API
    Testing
    QA Testing
    Java
    Python
    Test Results & Analysis
    Software QA
    Software Testing
    Selenium
    Selenium WebDriver
  • $30 hourly
    I am a highly motivated, results driven IT enthusiast and technical consultant with over 9 years of experience working with SMB and large e-commerce and government customers in integrating CDN, SaaS and front-end products, as well as a robust background in full stack software development, programming/scripting, web technologies, networking and troubleshooting.
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    Software Development
    Scripting
    Python
    HTML
    CSS
    SSL
    TCP/IP
    DNS
    HTTP
    SQL
    API Development
    API Integration
    AWS CloudFront
    API
  • $60 hourly
    I’m a developer experienced in building websites for medium-sized businesses. I can help with 3rd party services integrations, support and gradually improve legacy projects.
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    SendGrid
    OKTA
    HubSpot
    PHP
  • $45 hourly
    I’m a bioinformatics data analyst skilled in Python, React, and JavaScript. I can help analyze and visualize your data, develop efficient data pipelines, and build interactive dashboard. Let’s collaborate to transform your data into actionable insights.
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    Data Visualization
    Bioinformatics
    Python
    React
    Data Science
    Data Analysis
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