Hire the best JavaScript Developers in Simi Valley, CA

Check out JavaScript Developers in Simi Valley, CA with the skills you need for your next job.
Clients rate JavaScript developers
Rating is 4.8 out of 5.
4.8/5
based on 2,042 client reviews
  • $60 hourly
    I’m James Dab-go-tra, Los Angeles native. I've been designing and building websites for two decades. I’m a full-stack LAMP/LEMP web developer with expertise in fully developing and managing enterprise-level sites. I work with JavaScript, PHP, mySQL, and Nginx. I have a knack for realizing the visions of designers. I’ve been developing and fully managing custom WordPress themes and plugins since 2009. I have an expert knowledge in plugins, including avoiding plugins that add bloat. I emphasize performance, SEO, and clean and maintainable code.
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    PSD to WordPress
    Back-End Development
    Front-End Development
    MySQL Programming
    WordPress Theme
    Linux System Administration
    WordPress Development
    PSD to HTML
    CSS
    HTML
    PHP
    WordPress
    NGINX
  • $65 hourly
    • Experienced Full Stack Engineer with a background in front-end development, specializing in creating interactive web applications. • Proficient in both back-end and front-end. React, NextJs, Python, TensorFlow. • Skilled ML Engineer with hands-on experience in developing models for crop classification and detecting highlights in gameplay footage. • Current role in the gaming industry with exposure to AI applications, enhancing gaming experiences and engagement. • Direct involvement with customers, providing tailored solutions and support to meet specific user requirements. • Proven track record in a senior front-end engineering role, focusing on optimizing user interfaces and user experiences. • Competent in a variety of programming languages and frameworks, adaptable to various development environments. • Commitment to staying updated with the latest technologies and methodologies in both web development and machine learning.
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    Next.js
    Web Design
    Web Development
    HTML
    C++
    CSS
    Python
  • $75 hourly
    I am one of the most affordable US-based top rated plus software engineers on Upwork. Located in Southern California, I am honored to be among the top 3% of developers on the platform, showcasing a 100% Job Success Score and a consistent 5-star rating for proficiency in React and Node.js development. In my successful career on Upwork, I have had the privilege of earning the trust of numerous clients, translating into over $100k in project earnings. From spearheading engineering operations for a successful Silicon Valley startup to devising a custom cloud software solution for an upscale security firm in Beverly Hills, my portfolio spans diverse industries and solutions. Noteworthy projects include a web and React-Native mobile app for an innovative cannabis startup, and a social media influencer web application for a thriving Los Angeles startup. Off the clock, my passion for pushing technological boundaries has me developing a cutting-edge deep learning engine capable of detecting human behavior—an exciting glimpse into the future of computer vision. What sets me apart is my capacity to not only excel in development but also to understand and align with your business goals, needs and limitations. My reputation is built on 100% client satisfaction, and I commit to work tirelessly on your project until you are entirely delighted with the results. I believe in maintaining transparency and effective communication with my clients. You will receive daily status reports from me, complete with documentation of key sections of the source code, ensuring you're always in the loop with the project's progress. I believe in maintaining transparency and effective communication with my clients. You will receive daily status reports from me, complete with documentation of key sections of the source code, ensuring you're always in the loop with the project's progress. Here's a snapshot of what I offer: ***AGILE/SCRUM EXPERIENCE***: Extensive experience working in Agile/Scrum enterprise environments, consistently meeting and exceeding challenging sprint demands. ***FRONT-END AND BACK-END PROFICIENCY***: Mastery in front-end and back-end development with React, Redux, Node.js, JavaScript, Express, and Socket.io. ***DATABASE AND CLOUD EXPERTISE***: Proficiency with MongoDB (Mongoose), PostgreSQL (Sequelize), Nginx, and AWS. ***HTML AND CSS WIZARDRY***: Expertise in HTML and CSS, employing Bootstrap and Flexbox to craft seamless user experiences. Why collaborate with me? ***YOUR BUSINESS SUCCESS***: I put your business's success at the forefront, investing this commitment into your React/Node.js application. ***NUANCED UNDERSTANDING***: My experience with enterprise-level clients and small businesses equips me with a nuanced understanding of different needs and objectives. ***AGILE ENVIRONMENT***: I thrive in fast-paced Agile environments, delivering cutting-edge solutions with precision and efficiency. ***BUSINESS-MINDED***: As a business-minded JavaScript programmer, I not only deliver quality work, but also understand the commercial implications of technology decisions. ***CRAFTED SOLUTIONS***: I craft your React front-end—the face of your business—to perfection, while optimizing your Node.js backend—the engine of your application—for resource efficiency and superior performance. Elevate your business with a full-stack web developer you can trust. Let's collaborate to drive your success to the next level!
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    NGINX
    Business with 100-999 Employees
    API
    HTML5
    CSS
    HTML
    Node.js
    Web Application
    MongoDB
    Sequelize
    Flexbox
    Software Development
    React
  • $75 hourly
    30 year professional software developer and on-prem/cloud architect. I have helped design, build, extend and maintain world-class enterprise software platforms for both large Fortune 100 companies as well as start-up companies taking my last startup company to a successful exit selling for $220M. I have extensive experience programming with Python, Java and Javascript. I am also an AWS Certified Cloud Architect with extensive experience in porting applications from on-prem into the cloud as well as from the ground up.
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    Stock Market
    Scrum
    GitHub
    Java
    HTTP
    SaaS Development
    NoSQL Database
    Relational Database
    Agile Software Development
    Cloud Development
    Cloud Architecture
    Architectural Design
    Microservice
    Python
  • $15 hourly
    Hello, I am a skilled and experienced freelancer with expertise in HTML5, CSS, JavaScript, Angular, and React. I specialize in creating custom websites and webpages tailored to your specific needs, ensuring a professional and polished end result. With my knowledge and expertise, I can design and develop your online presence just the way you envision it. Let's work together to bring your ideas to life and create a stunning and functional website for your business or personal brand.
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    App Development
    Node.js
    ExpressJS
    GitHub
    jQuery
    Bootstrap
    Angular
    React
    Web Development
    CSS 3
    HTML5
    SQL
    C++
  • $50 hourly
    With over a decade immersed in the world of web and desktop app development, I've become a seasoned pro in navigating the intricacies of software creation and the full Software Development Life Cycle (SDLC). I bring a wealth of experience to the table, capable of managing every aspect of crafting top-tier systems while ensuring client needs are not just met, but exceeded. My portfolio boasts a diverse array of projects spanning industries such as Education, Government, Finance, and Employment Services. This breadth of experience equips me with the versatility to take on any challenge with confidence. One of my standout skills is my ability to demystify technical complexities, translating them into plain language that everyone can understand. Whether it's a one-on-one conversation or a group setting, I make sure everyone is on the same page, fostering clear communication and collaboration. Here's a snapshot of my expertise: 🚀 Proficient in .Net Core, .Net Framework, WPF, UWP, and ASP.NET for robust backend development. 🚀 Well-versed in SQL Server, MySQL and Oracle for efficient database management. 🚀 Specialized in building scalable systems that can grow alongside your business without missing a beat. 🚀 Skilled in Typescript, JavaScript, jQuery, HTML, CSS, Bootstrap for creating dynamic and user-friendly frontend interfaces. 🚀 Capable of crafting APIs using Rest API, and Firebase to facilitate seamless integration. 🚀 Familiar with cloud platforms like Azure and AWS for scalable and reliable hosting solutions. I'm eager to bring my expertise to your team, collaborating to deliver exceptional results and drive your projects to success.
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    Web API
    LINQ
    Model-View-Controller
    .NET Core
    Microsoft IIS
    GitHub
    AJAX
    jQuery
    Bootstrap
    CSS 3
    HTML5
    Microsoft SQL Server
    C#
    Entity Framework
  • $75 hourly
    Want to build a great online community to achieve great things? NationBuilder is an accessible, affordable software platform that helps leaders grow and organize communities to achieve great things Let Outreach Nation help transform your vision into an engaging Social Media driven machine guaranteed to get you votes, customers, donations, volunteers, or whatever it is that you desire We take full advantage of NationBuilder’s easy-to-update websites which include a people database and communication tools like email, text messaging and social media – all in one system. Businesses, nonprofits, governments, and politicians use NationBuilder to organize their communities and build more meaningful relationships with customers, supporters, and constituents. OUTREACH: NATION is a full service web design and online marketing firm established in 2010. We specialize in building elegant highly functional websites in both the Wordpress & NationBuilder platforms. We have been Certified NationBuilder Architects & Experts for approximately 1 year now and have worked with clients ranging from Political Parties, Advocacy Groups, Non Profits, Musicians, Restaurants, & Businesses.
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    Ruby on Rails
    CSS
  • $45 hourly
    I am a Software Engineer and a passionate learner, always curious about learning how everything around me works, avid programmer who likes solving complex and challenging problems. I love team work, and good communication. I have experience with: - Building and deploying Android and iOS apps. - Creating and maintaining Firebase databases. - Creating and maintaining GCP Cloud Functions.
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    TypeScript
    Docker
    Google Cloud Platform
    Git
    GitHub
    Dart
    Firebase
    Java
    Python
    Flutter
  • $30 hourly
    Summary * 25 years of experience in IT Industry in Quality Assurance and software development with strong technical skills in testing, test management, and automation of large Enterprise applications * Experience in setting up and managing a distributed QA team (onsite and offshore) * Handling client relationship for upcoming vendors for demos * Thorough participation and interaction with UATer's, Business Users and Vendors * Created customized automation framework and guided automation testing team to build automation scripts and doing an ROI. * Extensively involved in establishing QA methodology, preparing test plans, and managing the execution of test cases for UI, APIs, Data Warehouse and ETL * Strong technical background and ability to manage complex problems/situations. * Strong analytical skills, excellent communication, people skills and management skills. Great collaborator
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    Full-Stack Development
    React
    Test Management
    TypeScript
    API Testing
    SQL
    Cypress
    Postman
    Automated Testing
    Quality Assurance
    Test Results & Analysis
    Software Testing
    QA Testing
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