React and Next.js Engineer

As a React / Next.js Engineer, you will work remotely on an hourly paid basis to review AI-generated React/Next.js code, frontend architectures, and technical explanations, as well as produce high-quality reference implementations and step-by-step reasoning for complex engineering problems. You will assess solutions for correctness, clarity, accessibility, security, performance, and adherence to the prompt; identify issues in React rendering behavior, state management, SSR/SSG/ISR, routing/data fetching, hydration, caching, and bundle performance; fact-check technical information; write high-quality explanations and model solutions that demonstrate best practices; and rate and compare multiple AI responses based on correctness and reasoning quality.

This fully remote, hourly paid contractor role is with SME Careers, a fast-growing AI data services company and subsidiary of SuperAnnotate that provides AI training data to many of the world’s largest AI companies and foundation model labs—where your frontend expertise will directly help improve the world’s premier AI models used by millions of developers worldwide.

Important: There is no immediate project for this role; however, if qualified, you will be among the first experts we reach out to when relevant opportunities arise. This will also provide you with access to future projects available through our expert network.

Key responsibilities

• Develop AI Training Content: Create detailed prompts across React/Next.js topics and write high-quality reference answers to guide AI learning.
• Optimize AI Performance: Evaluate and rank AI responses to enhance correctness, clarity, accessibility, and performance.
• Ensure Model Integrity: Test AI models for inaccuracies or unsafe recommendations, validating reliability across real-world use cases.

Your profile

• Bachelor’s degree or higher in Computer Science, Software Engineering, or a closely related technical field (or equivalent practical experience).
• 4+ years of professional experience building production web applications with React, including at least 2+ years with Next.js (or equivalent SSR framework experience).
• Expert-level proficiency in modern React: hooks, component patterns, state management, memoization, rendering behavior, and testing.
• Strong Next.js fundamentals (Next 13/14+ preferred): App Router, Server Components (where applicable), route handlers, middleware, caching, and deployment patterns.
• Strong understanding of web fundamentals: HTTP, browser rendering, security basics (XSS/CSRF), cookies/sessions, and OAuth flows.
• Performance mindset: bundle optimization, code splitting, image optimization, Core Web Vitals, and profiling.
• Experience with testing and quality: Jest/Vitest, React Testing Library, Playwright/Cypress, linting, CI/CD.
• Minimum C1 English proficiency (written and spoken), with the ability to write clear technical explanations and follow detailed English-language guidelines.
• Proven experience conducting detailed code reviews and enforcing coding standards for maintainability, correctness, and accessibility.
• Previous experience with AI data training, annotation, or evaluating AI-generated technical content is a strong plus.
• Highly detail-oriented and systematic, with a methodical approach to evaluating reasoning quality and identifying subtle issues in complex UI code.

🌍 Geographic Availability This role is available to qualified experts globally. However, as a U.S.-based company, SME Careers complies with U.S. export control and sanctions regulations. Eligibility depends on your country of residence and any applicable trade restrictions. Some projects may have additional language or region-specific requirements.

💰 Pay Rate May Vary Based on Your Location Your actual compensation will be determined based on your location and local market conditions. See regional job listings for localized pay information, or the application process will clarify your specific rate.

If you're unsure whether you're eligible, proceed with the application—SME's screening will determine your jurisdiction status and applicable compensation.