• $30–$100 per hour equivalent, paid per accepted task • 100% remote • Part-time • Fully flexible schedule Work on the cutting edge of AI coding systems, on your own schedule, and get paid for the backend engineering judgment you already have. The AI coding systems changing how software gets built are trained and tested by real engineers. The teams building them need backend engineers who can create realistic feature and bug-fix tasks, judge the code AI produces, write the solution a strong engineer would deliver, and explain exactly where the implementation falls short. Your judgment helps shape the next generation of AI systems. This is that work, done remotely around your current job. What you'll do • Create realistic backend coding tasks for feature development and software bug fixes • Build reliable checks that accept valid solutions and reject incorrect or incomplete implementations • Review AI-generated code for correctness and maintainability • Assess debugging and performance work, including the quality of automated tests Why this is worth your time • Get paid the equivalent of $30–$100 an hour to build real AI skills, on top of your current job • Work directly with frontier AI coding tools and see how they are built, tested and improved, experience most backend engineers will not have for years • Build a career edge for what comes next: AI is reshaping backend engineering, and the engineers who understand it from the inside will lead that change • Fully remote, fully flexible, no minimum shift, no commute Who this is for • Professional backend development experience with Java, Node.js, Go, Rust, TypeScript, Python, C++ or a similar language • Experience building scalable services and APIs • Professional fluency in English and strong technical communication skills • No AI experience needed. You bring the expertise; we bring the training on the tools. Pay and details • $30–$100 per hour equivalent; pay is per accepted task, as an independent contractor • Fully flexible schedule; fully remote, Brazil How to apply 1. Apply on OpenTrain (about two minutes; upload your resume). 2. Complete a short application on the hiring platform. 3. If shortlisted, take a conversational AI interview with technical questions and a coding challenge, whenever it suits you. Most people hear back within days. Ready to put your backend engineering skills to work at the frontier of AI? Apply today. About OpenTrain AI OpenTrain AI connects experienced professionals with paid, part-time AI training work: shaping and improving the AI systems that companies are building right now.