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

To thrive as a JavaScript Developer, you need strong proficiency in JavaScript, HTML, CSS, and a solid understanding of web development principles, often backed by a degree in computer science or comparable experience. Familiarity with frameworks like React or Angular, version control systems like Git, and build tools such as Webpack is typically required. Problem-solving, attention to detail, and effective communication are crucial soft skills for collaborating on projects and resolving technical challenges. These skills and qualities ensure the delivery of robust, maintainable, and efficient web applications that meet user and business needs.

What are some common challenges faced by JavaScript Developers when working on large-scale applications?

JavaScript Developers working on large-scale applications often encounter challenges such as maintaining code readability, managing dependencies, and ensuring performance optimization. As projects grow, it becomes essential to implement best practices like modularization, code reviews, and thorough testing to prevent bugs and technical debt. Collaboration with backend developers, designers, and QA testers is frequent, requiring clear communication and an agile mindset to deliver features efficiently and address issues as they arise.

What does a JavaScript Developer do?

A JavaScript Developer is responsible for designing, developing, and maintaining web applications using the JavaScript programming language. They typically work on both the front-end (user interface) and sometimes the back-end (server-side) of web projects, creating interactive features, optimizing performance, and ensuring cross-browser compatibility. Their role often involves collaborating with designers and other developers to deliver a seamless user experience.

What is the difference between Javascript Developer vs Front-End Developer?

AspectJavascript DeveloperFront-End Developer
Primary FocusWriting and optimizing JavaScript codeDesigning and implementing user interfaces
Required SkillsJavaScript, HTML, CSS, frameworks like React or AngularHTML, CSS, JavaScript, UI/UX design
Work EnvironmentWeb development teams, software companiesWeb design agencies, tech firms, startups

Javascript Developers focus on coding and scripting using JavaScript, while Front-End Developers handle the overall design and user experience of websites. Both roles often overlap, but the Javascript Developer specializes in scripting, whereas the Front-End Developer emphasizes UI/UX design and layout.

What other companies are hiring for Javascript Developer jobs?
What are the most popular jobs at G2I?
What are the most popular categories at G2I?
Infographic showing various Javascript Developer job openings at G2I in the United States as of May 2026, with employment types broken down into 7% Full Time, and 93% Contract. Highlights an 9% Physical, and 91% Remote job distribution.
Senior Software Engineer - AI Interaction Evaluator (Codex / Claude Code, up to $200/hr)

Senior Software Engineer - AI Interaction Evaluator (Codex / Claude Code, up to $200/hr)

G2i Inc.

Fairfax, VA • On-site

$200/hr

Contractor

Posted 22 days ago

Job description

Senior AI Interaction Evaluator (Codex / Claude Code)

These roles are currently filled but we hire on a rolling basis as new projects open up. Apply now to join our talent bench - qualified candidates will be contacted directly when roles become available.

Contract | $50-200/hr | 10-20 hrs/week | Start ASAP (through early May)

Check out this Loom video for more details!

We're looking for highly experienced software engineer (SR+) to help evaluate the quality of interactions with modern coding agents such as OpenAI Codex and Claude Code.

This is not a traditional engineering role.

You won't be writing production code.
You'll be evaluating something harder: whether the model thinks like a great engineer.

What This Role Actually Is

You will assess how AI coding agents behave in real-world scenarios - focusing on:

  • Whether the response makes sense

  • Whether the preamble and reasoning are useful

  • Whether the output reflects strong engineering judgment

  • Whether the interaction feels right to an experienced developer

This role is about engineering taste - not syntax correctness.

What You'll Be Doing

  • Evaluate AI-generated coding interactions end-to-end

  • Judge whether outputs are:

    • Useful

    • Correct (at a high level)

    • Aligned with how a strong engineer would think

  • Assess the quality of explanations and reasoning, not just code

  • Distinguish between different levels of response quality (e.g. what makes something a 2 vs 4)

  • Provide clear, opinionated feedback on:

    • What worked

    • What didn't

    • What felt "off" or misleading

  • Help define what great looks like when interacting with tools like Cursor

What We Mean by "Taste"

We're specifically looking for engineers who can answer questions like:

  • Does this feel like something a strong engineer would actually say?

  • Is this explanation helpful, or just technically correct?

  • Is the model guiding the user well, or just dumping output?

  • Would this interaction build or erode trust?

You should be comfortable making subjective but rigorous judgments.

Who You Are

  • Staff / Principal-level engineer (or equivalent experience)

  • Strong background in one of the below:

    • TypeScript / JavaScript

    • Python

  • Hands-on experience using:

    • OpenAI Codex

    • Claude Code

    • Cursor

  • Deep familiarity with modern AI-assisted dev workflows

  • Able to evaluate code without needing to fully execute or deeply review every line

  • Comfortable giving direct, opinionated feedback

  • High bar for what "good engineering" looks like

Nice to Have

  • Experience with tools like Cursor or similar AI-first IDEs

  • Prior exposure to prompt design or evaluation workflows

  • Experience mentoring senior engineers or defining engineering standards

Engagement Details

  • US and Canada up to $200/hr

  • EU and Latam up to $150/hr

  • Other locations up to $100/hr

  • Hours: ~10-20 hours/week

  • Duration: Through early May (with possible extension)

  • Start: ASAP

  • Process:

    • Take-home evaluation exercise

    • One behavioral interview

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About G2i

Sourced by ZipRecruiter

Industry

Software development

Company size

11 - 50 Employees

Headquarters location

Delray Beach, FL, US

Year founded

2012

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