Javascript - Senior Developers - AI Training - Long Beach, US

Prolific is building a global platform for high-quality human data used by AI developers, researchers, and organizations.

The role

We're looking for JavaScript Experts to join an Expert Network to help train and evaluate cutting-edge AI models using real engineering expertise. Candidates complete a short assessment to evaluate their suitability for AI tasks. Successful applicants can join as participants and get paid to train and evaluate AI models.

Researchers looking for these skills tend to pay up to $50 per hour. Tasks may require one hour of uninterrupted work, though many are shorter.

What you'll bring

• BS, MS, or PhD in Computer Science, Software Engineering, or a closely related technical field
• Professional experience building scalable web applications using JavaScript/TypeScript
• Ability to solve LeetCode Medium to Hard-level problems in JavaScript independently
• Expert understanding of the Event Loop, closures, prototypical inheritance, and asynchronous patterns including Promises and async/await
• High standard for clean code, including modularity, readability, and adherence to modern ES6+ standards
• Ability to identify subtle logical flaws, memory leaks, and security vulnerabilities such as XSS and prototype pollution in generated code

What you'll be doing in the role

• Review AI-generated JavaScript and TypeScript code for correctness and best practices
• Audit AI reasoning and explanations for algorithmic solutions
• Execute generated scripts in Node.js or browser environments to verify performance and output
• Identify inefficient solutions, deprecated syntax, or hallucinated library methods
• Provide structured feedback on frontend and backend architecture discussions

Key Technologies

• Expert mastery of JavaScript (ES6+) and TypeScript
• Experience with React, Node.js, Vue, or Angular
• Proficiency with Jest, Cypress, Webpack, and Vite
• Strong understanding of RESTful APIs, GraphQL, and server-side logic in a Node environment

Why join as a Participant

Joining the Expert Network provides the opportunity to contribute professional expertise toward the development of future AI systems while benefiting from flexible hours, remote work, and competitive pay rates.

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