JavaScript Engineer

About the JavaScript Engineer Role at SME Careers

As an hourly paid, fully remote JavaScript Engineer for AI Data Training, you will play a crucial role in enhancing AI models. Your responsibilities include reviewing complex AI-generated code and explanations, or generating new ones from scratch. You will meticulously evaluate the reasoning quality and step-by-step problem-solving approaches, providing expert feedback to ensure AI models produce accurate, logical, and clearly explained answers.

You will assess solutions for correctness, clarity, and adherence to specific prompts, identifying errors in methodology or conceptual understanding. A key part of your work will involve fact-checking information, writing high-quality explanations and model solutions that demonstrate correct methods, and rating and comparing multiple AI responses based on their correctness and reasoning quality.

This position is with SME Careers, a rapidly expanding AI Data Services company and a subsidiary of SuperAnnotate. SME Careers provides essential AI training data to many of the world’s leading AI companies and foundation model labs. Your contributions will directly improve premier AI models, offering the flexibility of impactful, detail-oriented remote contract work.

Key Responsibilities

• Develop AI Training Content: Create detailed prompts on various topics and generate responses to guide AI learning, ensuring models comprehensively understand diverse subjects.
• Optimize AI Performance: Evaluate and rank AI responses to enhance the model's accuracy, fluency, and contextual relevance.
• Ensure Model Integrity: Test AI models for potential inaccuracies or biases, validating their reliability across various use cases.

Your Profile

• Minimum 2+ years of professional JavaScript experience in production environments.
• Strong understanding of closures, async/await, prototype-based inheritance, and JavaScript event loop behavior, with deep proficiency in modern Vanilla JavaScript (ES6/ES2015+).
• Proven ability to evaluate correctness, readability, and performance of JavaScript code, including identifying subtle logic and edge-case issues.
• Hands-on work experience in software engineering, preferably in roles involving code review, mentoring, or technical design discussions.
• Significant experience using Large Language Models (LLMs) or AI coding assistants while programming, combined with a critical mindset for validating their output.
• Excellent English writing skills, capable of producing clear, concise, and pedagogical technical explanations.
• Strong proficiency with at least one major frontend framework (such as React, Angular, or Vue.js) or backend runtime (such as Node.js with Express or NestJS).
• Minimum Bachelor’s degree in Computer Science or a closely related technical field.
• Previous experience with AI data training, data annotation, or evaluation of AI-generated technical content is a strong plus.
• Minimum C1 English proficiency and a highly detail-oriented working style are required.
• Preferred qualifications include contributions or merged PRs in JavaScript or TypeScript open-source projects, familiarity with bundlers and tooling (Webpack, Vite, Rollup), frontend–backend integration and Node.js runtime behavior, reviewing typed API layers, DTOs, or schema-driven designs, and experience evaluating frontend logic, async patterns, and state management.

Key Skills/Competency

• JavaScript
• ES6+/Modern JavaScript
• AI Model Evaluation
• Code Review
• Technical Writing
• LLM Interaction
• Frontend Frameworks (React, Angular, Vue.js)
• Backend Runtimes (Node.js, Express, NestJS)
• Problem Solving
• Data Annotation