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.
  • $95 hourly
    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
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    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
  • $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
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    Adobe Experience Manager
    Bootstrap
    Tailwind CSS
    HTML5
    CSS 3
    Vue.js
    JavaScript
    Next.js
    React
    Angular
    Material UI
    Ember.js
  • $20 hourly
    Hi. I'm Fabian, I'm a Senior Product Designer and Front developer that helps your organization achieve goals by understanding problems and proposing tested solutions. I've always been drawn to the overlap between design and development. My skills are broad: from UX to design, front end. I enjoy each aspect, and love building sites & mobile apps from start to finish, for clients all over the world I've done a bit of UI / UX for the +6 years working for startups and mid-sized companies from the United States, Chile, Costa Rica, Mexico, Brazil, UK, Spain, Germany, I know Sketch, Illustrator, and Photoshop like the back of my hand, and also I'm a coder, so I know how to build everything that I design and I understand the process and how to communicate between design and development.
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    UI/UX Prototyping
    Adobe XD
    User Experience Design
    UX Writing
    UX & UI
    Sketch
    Adaptive Web Design
    UXPin
    React
    Rapid Prototyping
    Figma
  • $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.
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    Bug Fix
    Agile Project Management
    Redux
    RESTful API
    Agile Software Development
    Software Debugging
    Git
    MySQL
    MongoDB
    CSS
    Node.js
    React
    HTML5
    JavaScript
    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.
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    Docker
    RESTful API
    Vue.js
    DevOps
    Golang
    Laravel
    GraphQL
    Java
    PHP
    JavaScript
    Node.js
    Swift
    React
    React Native
    PostgreSQL
  • $44 hourly
    Passionate about coding, music and working on new solutions for people. Web development is my main field, but I'm very interested in low level programming, AI and Machine Learning. Quick learner, patient and persistent person. Ability to solve problems, being proactive, good team worker and very communicative when dealing with problems. Ability to work under pressure, easily adapted and integrated.
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    Android Studio
    Android
    C
    API
    Cloud Computing
    Agile Software Development
    API Development
    TypeScript
    Amazon Web Services
    React
    Python
    C++
    Node.js
  • $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
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    PHP
    API Development
    Angular 4
    MySQL
    GraphQL
    NodeJS Framework
    Handlebars
    CSS 3
    Next.js
    React
    JavaScript
    Front-End Development
  • $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
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    Autodesk Fusion 360
    3D Model
    Serverless Stack
    Amazon Web Services
    React
    Node.js
    Golang
    Python
    JavaScript
  • $38 hourly
    I'm currently seeking projects to work on during my free time. With five years of experience as a software developer, I have a track record of delivering high-quality work and contributing innovative ideas to enhance business processes. Over the years, I've polished my technical skills and adopted best practices across various technology domains I am a constant learner and I enjoy learning new technologies and automate manual tasks. I have experience using the below technologies: • UiPath • Azure Cloud • PowerShell • CI/CD • React, C# • SQL
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    CI/CD Platform
    Microsoft Power Automate
    PostgreSQL
    MySQL
    C#
    React
    Microsoft Azure
    UiPath
    Automation
  • $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.
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    Solidity
    Blockchain
    Windows Server
    CSS 3
    ASP.NET Core
    Microsoft Access
    React
    HTML
    Web Development
    Visual Basic
    Rust
    Python
    JavaScript
    SQL
    C#
  • $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)
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    MEVN Stack
    MERN Stack
    CI/CD
    Scrum
    React Native
    HTML5
    SCSS
    Git
    Nuxt.js
    TypeScript
    Amazon Web Services
    Web Application
    JavaScript
    Vue.js
    React
  • $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.
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    HTML5
    CSS 3
    Material UI
    JavaScript
    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
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    MongoDB
    Web Design
    Web Development
    GitHub
    Agile Software Development
    Bootstrap
    ExpressJS
    JavaScript
    TypeScript
    SQL
    HTML
    Git
    Node.js
    React
    CSS
  • $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.
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    REST API
    TypeScript
    JavaScript
    API Integration
    Node.js
    React
    Tailwind CSS
    Next.js
    Web Application
  • $20 hourly
    I'm developer currently working as a Senior Front-end Engineer. Passionate about software development and UI/UX design. I have experience building small and medium websites for clients and working for bigger companies. - I'll handle fullstack development of a project using JavaScript libraries and frameworks like React, Node.js and ExpressJs, Python or other technologies if needed. - I'll manage your project from brief to finished product. I'm really excited to help people and create awesome projects!
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    Agile Software Development
    Node.js
    ExpressJS
    MongoDB
    SQL
    Data Processing
    Data Visualization
    D3.js
    Python
    React
    User Experience
    UI Graphics
    UX & UI
  • $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!
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    SEO Performance
    Web Development
    Git
    Landing Page
    CSS
    HTML
    JavaScript
    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.
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    Next.js
    CSS
    HTML
    React
    JavaScript
    Tailwind CSS
    Front-End Development
  • $30 hourly
    Professional Master Software Engineer with +6.5 years of development experience in object-oriented programming. Relevant experience in stages of the software development life cycle such as requirements gathering, design, coding, code reviews, testing and maintenance using diverse agile methodologies and different technology stack. Strong ability to complete complex tasks on time based on my analytical, debugging and troubleshooting skills. TECHNICAL SKILLS Programming Languages: - Java versions 8, 11, 17 - Groovy - Python - JavaScript Testing frameworks: - Junit Powermock - Mockito - TestNG - Spock Front End Technologies: - React Js - Vue.js - HTML5 - CSS3 - React Bootstrap - jQuery - Primefaces Web Technologies: - JSP - JSF Servlets - XML - JSON Database: - Postgresql 9.5 - Redis - MongoDB - MySQL - MS SQL Server Frameworks/APIs: - Spring MVC - Spring Framework - Spring Boot - Spring Security - REST Event-Driven Technologies: - Kafka - Confluent - RabbitMQ Cloud Services: AWS Services: - Lambda - S3 - EC2 - DynamoDB - SQS - SNS - API Gateway Basic exposure to GCP and Azure. PROFESSIONAL SKILLS Committed to excellence. Strong teamwork and mentoring skills. Fast learner. Responsible Self-Organized and Detail Oriented. Proactive. Strong sense of ownership. Strong moral compass. Methodical problem solver. High verbal and written English communication skills. (C1 on BELT Test) ARCH ITECTURAL SKILLS Microservices Model View Controller (MVC) Layered Event-Driven (EDD) Test-Driven (TDD) Domain-Driven (DDD) CQRS Event Sourcing Hexagonal Architecture Design Principles SOLID principles RESTful API Design OAuth and OpenID Connect
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    Software Testing
    Software Design Pattern
    Software Architecture
    Auth0
    Kubernetes
    Docker
    Vue.js
    React
    Python
    RabbitMQ
    Apache Kafka
    Spring Security
    Hibernate
    Spring Boot
    Java
  • $10 hourly
    ¡Hola! Mi nombre es Alex González Bonilla, y soy un desarrollador de software y web con casi dos años de experiencia. Aquí están las áreas en las que destaco: - Desarrollo Frontend y Backend: Capaz de manejar ambas caras del desarrollo web para ofrecer soluciones completas. - Tecnologías: Experto en C#, Angular, SQL Server, AstroJS, React, Tailwind, Bootstrap y JQuery. Esta amplia gama de tecnologías me permite construir y optimizar aplicaciones robustas y eficientes. - Bases de Datos: Manejo de bases de datos NoSQL, lo que me permite trabajar con estructuras de datos flexibles y escalables. - Administración de Servidores: Experiencia en la administración de servidores tanto Ubuntu como Windows Server, asegurando un rendimiento óptimo y seguridad.
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    Tailwind UI
    Windows Server
    Ubuntu
    .NET Core
    Bootstrap
    Tailwind CSS
    Amazon DynamoDB
    MongoDB
    React
    TypeScript
    C#
    .NET Framework
    Angular
    Node.js
    Microsoft SQL Server
  • $30 hourly
    🙋‍♂️Hello! I'm an AI engineer with a deep passion for NLP and ML, particularly in the realm of Conversational AI. From designing sophisticated chatbots to creating powerful sentiment analysis models, I've got a wealth of experience under my belt.🥇 ⭐I pride myself on delivering top-notch, innovative solutions, always with a keen eye on client satisfaction. I'm excited to bring cutting-edge technology to your projects. Let's connect and make something amazing together! 💎About Me: I'm an experienced AI engineer with a strong specialization in Natural Language Processing (NLP), Machine Learning (ML), and Conversational AI systems. My expertise lies in developing state-of-the-art chatbots, with extensive hands-on experience in GPT-based models and Language Model Learning Machines (LLMs). 🎫What I Do: ✔Chatbots: I've built intelligent chatbots for a variety of business applications. ✔Sentiment Analysis: I've developed robust sentiment analysis models for large-scale social media platforms. ✔Data Preprocessing: I've optimized data preprocessing pipelines to enhance text classification accuracy. ✔Data Scraping: I've scraped large amount of data from online. ✔ML model design 💪Beyond Text: My skills aren't limited to text-based solutions. I also have a solid background in processing non-textual data, including images and binary data, making me a versatile asset for any project. 🥽My Focus: Delivering high-quality, efficient, and innovative solutions that exceed client expectations is my top priority. Having worked with diverse teams on numerous projects, I understand the importance of timely communication and place a high value on client satisfaction. 🤲Let's Work Together: Whether you need help developing advanced conversational AI systems or require expertise in NLP and ML, I'm here to provide reliable, cutting-edge solutions. I'm eager to connect and collaborate to achieve your project's goals. Thank you for visiting my profile. I look forward to embarking on this technological journey with you!
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    Problem Solving
    Neural Network
    Natural Language Processing
    Generative AI
    AWS Cloud9
    PostgreSQL
    Claude
    OpenAI API
    TensorFlow
    Django
    Flask
    React
    ML Automation
    Rasa
    LangChain
  • $60 hourly
    I am a developer experienced in designing and developing medium and high complexity solutions for multiple customers. If you require Data Visualisation Solutions, Application Development or Software Design, I am the guy for you. I include: - Project Documentation - Full Project Management - Fast response times and regular communication
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    Data Visualization
    Data Cleaning
    Data Analysis
    IT Support
    Software Architecture
    QA Testing
    SQL
    Data Science
    Automation
    Supply Chain & Logistics
    C#
    Python
    Next.js
    React
  • $10 hourly
    Computer engineer with more than five years of experience in the IT area, from technical support, network systems, and currently focused on fullstack software development with different technologies and web design architectures, mvc, backend services with programming languages such as Java, C#, and front end with js such as react js or angular
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    Product Development
    Software Development
    React Bootstrap
    React
    CSS
    JavaScript
    HTML
    PostgreSQL
    MySQL
    MongoDB
    Spring Boot
    ASP.NET Core
  • $20 hourly
    I am passionate about technology, I enjoy working in teams and learning from others. I always look forward to professional growth. I am someone who can solve problems effectively, facing challenges and finding innovative solutions in various situations. I am committed to continuous learning and excited about opportunities that allow me to contribute and further develop in the technology field.
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    Scrum
    Web Application Development
    Bootstrap
    SQL
    JavaScript
    Java
    C#
    C++
    HTML5
    CSS 3
    React
  • $4 hourly
    ¡Hello, my name is Emily Chacón! I am a responsible person with experience in customer service, as well as in the administrative and accounting area. In addition, I am currently studying Systems Engineering, which has allowed me to acquire knowledge in the field of web development. I have experience in Java and JavaScript programming languages, and I am currently studying CISCO networks. During my career, I have acquired skills in customer service, problem solving and management of administrative tasks. My experience in the accounting area has given me solid knowledge in recording financial transactions, invoice control and reporting. As a Systems Engineering student, I am passionate about technology and I am constantly learning. My main focus is on the development of applications and the use of programming languages such as Java and JavaScript. In addition, I have knowledge in the area of networks and communications, specifically in Cisco technologies. I am a proactive person, results oriented and with the ability to work independently or in a team. I easily adapt to new environments and I have a great capacity for learning. I am excited to put my skills and knowledge at the service of your projects and help you achieve your goals.
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    CSS 3
    Sass
    HTML
    JavaScript
    Java
    React
    Scrum
    Microsoft Outlook
    Office 365
    Cisco Certified Entry Networking Technician
    Receptionist Skills
  • $15 hourly
    I am a Computer Engineering student who loves technology and problem-solving. I have skills in project management, different programming languages ​​​​, data base , and some technologies for web development. Also, I have a certification in Marketing and Regular English level. I worked for some companies like Community Manager, intern in Software engineering and administrative assistant. -Knows HTML, React, Css,Java , Python, SQL , Mongo DB , C++. -Knows Microsoft Office: Excel, Word, Power Point. -Experience in Project Management. -Experience teaching different subjects. -Regular communication is important to me, so let’s keep in touch.
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    PostgreSQL
    React
    Jira
    GitHub
    Git
    MongoDB
    SQL
    CSS
    Java
    Python
    HTML
    Excel Formula
    Business Management
    Management Skills
    Administrate
  • $5 hourly
    I have experience in developing software applications for various university projects and my recently position as a student worker in Intel. Skilled in working with databases, APIs, and software development tools. My student intern experience also includes collaborating with cross-functional teams to deliver high-quality software solutions.
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    CI/CD
    GitHub
    ExpressJS
    Node.js
    MySQL
    MongoDB
    TypeScript
    React
    Database
    Software
    JavaScript
    Product Development
    Software Development
  • $22 hourly
    Soy un desarrollador de software y estudiante de la carrera Ingeniería en Sistemas de Software en la Universidad Nacional de Costa Rica, me gusta ayudar a solucionar problemas de la gente. Tengo un conocimiento intermedio en diversos lenguajes de programación y no tengo problema en adaptarme a nuevas tecnologías.
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    Material UI
    Tailwind CSS
    WordPress
    Software Development
    Web Application Development
    Next.js
    Git
    React
    Responsive Design
    React Native
    JavaScript
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