Full-Stack Engineer

OpenTrain AI is seeking a Full-Stack Engineer for a part-time, remote contractor position focused on AI code evaluation. In this role, you will create and assess realistic software tasks, review AI-generated code, and write reference solutions while applying your engineering expertise. Daily responsibilities include evaluating user-facing features and APIs, tracing requests and data across systems, and ensuring the security, performance, and maintainability of code. Candidates should have substantial experience in building production full-stack applications using various programming languages, along with a strong understanding of full-stack systems, including browser applications, APIs, databases, and debugging. Professional fluency in English is required, as the role involves explaining technical gaps and contributing to software architecture. This position is fully remote, allowing for flexible hours with no fixed shifts, making it suitable for those looking to work under 20 hours a week. The role is ideal for professionals who are comfortable navigating unfamiliar codebases and have a solid background in full-stack development.