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Best JavaScript freelancers to hire in California 2025

Looking to hire JavaScript freelancers in California for your next project? Browse the world’s best JavaScript freelancers in California on Contra.

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Logo for Wix StudioLogo for RiveLogo for WebstudioLogo for GlorifyLogo for JitterLogo for FlutterFlowLogo for PeachWebLogo for CanvaLogo for Lottie FilesLogo for Workshop BuiltLogo for BuildshipLogo for AppsumoLogo for FramerLogo for BarrelLogo for BubbleLogo for LummiLogo for WebflowLogo for GrayscaleLogo for Stride UXLogo for InstantLogo for SplineLogo for KittlLogo for RelumeLogo for HeyGenLogo for Replo

People also hire

Explore JavaScript projects in California on Contra

Cover image for Sarah Jane Dias
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35

Sarah Jane Dias

Cover image for Crypto Luminary Web App
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77

Crypto Luminary Web App

Cover image for SkyScribe Weather Telegram Bot
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110

SkyScribe Weather Telegram Bot

Cover image for NFT Mint Telegram Bot
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292

NFT Mint Telegram Bot

Cover image for Web Development & Design for Quartile
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47

Web Development & Design for Quartile

Cover image for Mobile Development & Design for Quartile
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29

Mobile Development & Design for Quartile

Cover image for Data Legal Drive
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17

Data Legal Drive

Cover image for Base.club Miami
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135

Base.club Miami

Cover image for Faranak Shahroozi  • Specialized Webflow Design & Dev Sprint
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2

Faranak Shahroozi • Specialized Webflow Design & Dev Sprint

Cover image for Cenario’s Pizza • $340k/Year Webflow Transformation
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4

Cenario’s Pizza • $340k/Year Webflow Transformation

Cover image for Corporate LP | Framer | Figma |  UIUX
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2

Corporate LP | Framer | Figma | UIUX

Cover image for Spark: A synthesizer keyboard.
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3

Spark: A synthesizer keyboard.

Cover image for Customized ERC-20 Token
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3

Customized ERC-20 Token

Cover image for Prevail Legal
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2

Prevail Legal

Cover image for Non-Profit Web Apps 🤲💙🌎
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0

Non-Profit Web Apps 🤲💙🌎

Cover image for UNC-Chapel Hill - Web Application Design and Development
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3

UNC-Chapel Hill - Web Application Design and Development

Cover image for Lids - They Gave Us Game | Web Application Design & Development
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6

Lids - They Gave Us Game | Web Application Design & Development

Cover image for RetroFlix | AI Chatbot and Web Development
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2

RetroFlix | AI Chatbot and Web Development

Cover image for Putzel Kitchen | Full-stack development
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0

Putzel Kitchen | Full-stack development

Cover image for GhostCoat | Web application development
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0

GhostCoat | Web application development

Cover image for TellaVsn | Brand-Centric Digital Strategy
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0

TellaVsn | Brand-Centric Digital Strategy

Cover image for Smart AI-Powered Appraisal Reviews
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0

Smart AI-Powered Appraisal Reviews

Cover image for Fiverr: Blog Migration
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1

Fiverr: Blog Migration

Cover image for Fiverr: Business Needs Index
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0

Fiverr: Business Needs Index

Cover image for Fiverr: Accelerator Program
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1

Fiverr: Accelerator Program

Cover image for Magnet: Rebrand + Migration
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2

Magnet: Rebrand + Migration

Cover image for Blood as an Oratory Vessel
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4

Blood as an Oratory Vessel

Cover image for Add Time Intervals in JavaScript the Easy Way
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1

Add Time Intervals in JavaScript the Easy Way

Cover image for Hair Extensions Landing Page
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1

Hair Extensions Landing Page

Cover image for Redesign Website | UX/UI Design
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0

Redesign Website | UX/UI Design

Cover image for SurplusRadios E-commerce Website
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1

SurplusRadios E-commerce Website

Cover image for Zilp Social Network and Ride-Sharing Application
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1

Zilp Social Network and Ride-Sharing Application

Cover image for ContentHub Content Creation and Client Management Dashboard
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0

ContentHub Content Creation and Client Management Dashboard

Cover image for ACEA Landing Page Redesign
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3

ACEA Landing Page Redesign

Cover image for Website for Marx Digital Manufacturing
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36

Website for Marx Digital Manufacturing

Cover image for Exodus Auto Sales Website Redesign
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3

Exodus Auto Sales Website Redesign

Cover image for Outsourced Chief Investment Officer Due Diligence Platform
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0

Outsourced Chief Investment Officer Due Diligence Platform

Cover image for Esaar: Micro-donations platform for emerging markets
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20

Esaar: Micro-donations platform for emerging markets

Cover image for React Native Python App
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44

React Native Python App

Cover image for Update product page to enhance aesthetics and boost conversation
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5

Update product page to enhance aesthetics and boost conversation

Cover image for Coffee Job
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Coffee Job

Cover image for Long-Term, Head of QA Engineering for Metaverse Startup
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4

Long-Term, Head of QA Engineering for Metaverse Startup

Cover image for Celsius.com | Custom WordPress Theme Development
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1

Celsius.com | Custom WordPress Theme Development

Cover image for NocsProvisions.com | Custom Shopify Theme Development
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3

NocsProvisions.com | Custom Shopify Theme Development

Cover image for Campuswave
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0

Campuswave

Cover image for Football Jobs USA
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1

Football Jobs USA

Cover image for Style Refresh / Redesign
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0

Style Refresh / Redesign

Cover image for BookTix Chart Builder
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2

BookTix Chart Builder

Top services from JavaScript freelancers in California on Contra

FAQs

Begin by outlining the project's goals and specific functionalities you expect to be built. Create a detailed project brief that includes mockups, user personas, and any technical requirements. This document should be shared with potential freelancers to ensure they understand the full scope and the expectations. Establishing these elements upfront will help in aligning the freelancer's skills with your project needs and set the foundation for agreeing on deliverables.
Review the freelancer's previous work and portfolio to see if they have experience with projects similar to yours. Conduct a video call or interview to discuss your project in detail and ask about their approach to problem-solving and handling challenges. Asking for references or testimonials from previous clients can also provide additional assurance of their capabilities and professionalism.
Establish regular check-ins, such as weekly or bi-weekly meetings, to discuss project progress and address any questions or issues. Use project management tools to track tasks, deadlines, and deliverables. It is important to agree on a primary channel of communication (email, Slack, etc.) and response times for both parties to ensure smooth and effective communication throughout the project.
Contra is designed for both freelancers (referred to as "independents") and clients. Freelancers can showcase their work, connect with clients, and manage projects commission-free. Clients can discover and hire top freelance talent for their projects.
Contra aims to revolutionize the world of work by providing an all-in-one platform that empowers freelancers and clients to connect and collaborate seamlessly, eliminating traditional barriers and commission fees.

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