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Freelance Javascript Jobs in Seattle, WA (NOW HIRING)

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Freelance Javascript information

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$16

$54

$150

How much do freelance javascript jobs pay per hour?

As of Jul 30, 2026, the average hourly pay for freelance javascript in Seattle, WA is $54.32, according to ZipRecruiter salary data. Most workers in this role earn between $27.64 and $70.34 per hour, depending on experience, location, and employer.

What are some common challenges faced by freelance JavaScript developers when working with multiple clients?

Freelance JavaScript developers often juggle several projects at once, which can lead to challenges in managing deadlines, communication, and client expectations. Each client may have different coding standards, project management tools, and workflows, requiring adaptability and strong organizational skills. Additionally, freelancers must stay proactive about clarifying project requirements and providing regular updates to avoid misunderstandings, as they typically work remotely and may not have immediate access to team members.

What Are Freelance JavaScript Jobs?

JavaScript is a scripting language that has become a standard in web technology. It is often used on front-end coding to create content updates, animated graphics, and interactive maps. A freelance JavaScript job allows you to accept a project contract and work with a client until they are satisfied with the finished product. There are opportunities available as a Java software developer, programmer, or engineer. While the responsibilities of each job may differ, but ultimately, you communicate with the client to understand what they want and then use software coding to complete your duties.

What are the key skills and qualifications needed to thrive as a Freelance JavaScript Developer, and why are they important?

To thrive as a Freelance JavaScript Developer, you need a strong grasp of JavaScript fundamentals, modern frameworks like React or Vue, and proficiency in web development concepts, often supported by a portfolio of completed projects. Familiarity with source control systems like Git, code editors such as VS Code, and experience with package managers (npm/yarn) are typically required. Strong communication, client management, and time-management skills set top freelancers apart. These abilities ensure you can deliver high-quality, maintainable solutions while effectively collaborating with clients and managing multiple projects.

What does a freelance JavaScript developer do?

A freelance JavaScript developer is a self-employed professional who specializes in using the JavaScript programming language to build websites, web applications, or add interactive features to existing sites. They typically work with clients on a project-by-project basis, handling tasks such as front-end development, back-end scripting (often with Node.js), debugging, and integrating APIs. Freelance JavaScript developers need strong coding skills, good communication, and the ability to manage their own schedules and deliverables.
More about Freelance Javascript jobs
What are the most commonly searched types of Javascript jobs in Seattle, WA? The most popular types of Javascript jobs in Seattle, WA are:
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What cities near Seattle, WA are hiring for Freelance Javascript jobs? Cities near Seattle, WA with the most Freelance Javascript job openings:
Freelance Javascript jobs near you
Infographic showing various Freelance Javascript job openings in Seattle, WA as of July 2026, with employment types broken down into 64% Full Time, 13% Part Time, 2% Temporary, and 21% Contract. Highlights an 67% Physical, 2% Hybrid, and 31% Remote job distribution, with an average salary of $112,990 per year, or $54.3 per hour.

Senior Software Engineer - Agent Evaluation - Freelance/Remote 100+ openings

Braintrust

Seattle, WA • On-site

$139K - $183K/yr

Other

This job post has expired today. Applications are no longer accepted.

Job description

Open to candidates in the North America, South America, Asia and Europe.
Please submit your CV in English and indicate your level of English proficiency.

Mindrift connects specialists with project-based AI opportunities for leading tech companies, focused on testing, evaluating, and improving AI systems. Participation is project-based, not permanent employment.


What this opportunity involves 

We're building a dataset to evaluate AI coding agents - how well a model handles real-world developer tasks.

You'll create challenging tasks and evaluation criteria within realistic simulated environments:

  • Build realistic developer environments - a virtual company with codebase, infrastructure, and context (tickets, docs, conversations) that forms a believable development history
  • Design tasks from intermediate states of these environments - craft the prompt, define what "solved" means, and ensure the task is solvable by an AI agent
  • Write tests that verify agent solutions - accept all valid approaches and reject incorrect ones, neither too strict nor too lenient
  • Iterate on tasks and tests based on QA feedback - review agent solutions, analyze failures, and refine until the evaluation is fair and robust

What this is NOT

  • Not data labeling
  • Not prompt engineering
  • Not writing code from scratch - the agent writes most of the code; you guide and evaluate

What we look for

  • 5+ years in software development
  • Core stack: Python (FastAPI), JavaScript/TypeScript (React), Docker, Postgres, Kafka, Redis
  • Experience writing tests (functional, integration)
  • English proficiency - B2+


Why this is hard 

Frontier models are already good at coding. Creating a task that genuinely challenges the best models is non-trivial. You need to deeply understand where models fail and what scenarios reveal the difference between a good and a bad solution. Tasks have many valid solutions - writing tests that accept all correct solutions and reject incorrect ones is harder than it sounds.


How it works

Apply → Pass qualification(s) → Join a project → Complete tasks → Get paid


Effort estimate

Tasks for this project are estimated to take 20 hours to complete, depending on complexity. This is an estimate and not a schedule requirement; you choose when and how to work. Tasks must be submitted by the deadline and meet the listed acceptance criteria to be accepted.


Hiring & Onboarding Process

The process is designed to move quickly and typically includes the following steps:

  1. App review and invitation to a virtual project introduction session (approximately 30 minutes)
  2. Platform registration and identity verification
  3. Technical assessment (approximately 35 minutes)
  4. Background check (completed at no cost to candidates)
  5. Onboarding and project-specific training tasks
  6. Begin production work!
Additional Requirements
  • Willingness to complete identity verification as part of the onboarding process.
  • Ability to complete a technical assessment.
  • Willingness to join and participate in Discord, which will be used for project communication and updates.
  • Successful completion of a background check is required prior to onboarding.
  • Reliable internet connection and ability to communicate effectively in a remote environment.

Apply