TypeScript Engineer - Codebase Expert - AI Trainer

• Select tasks from a pre-validated pool of TypeScript repositories, each pinned to a specific git commit and arriving with an engineering question, positive and negative rubrics, foils, and a golden solution.
• Explore the repository until you genuinely understand the subsystem in question, including the relevant PR or issue history.
• Rewrite the task’s question so it defeats frontier coding agents while remaining well-defined and fairly answerable.
• Adjust rubrics and foils to reward correct reasoning and reject plausible-but-wrong answers.
• Run the full validation loop in Studio - Check, Golden, Run, Analyze - and iterate until every stage passes.
• Document your work in the task README and submit for expert review, addressing reviewer feedback on returned tasks., PS: Our team reviews applications daily. Please complete your AI interview and application steps to be considered for this opportunity.

Must-Have

• 3+ years of professional software engineering experience, with substantial production TypeScript.
• Demonstrated ability to navigate a large, unfamiliar TypeScript monorepo and explain how it behaves at runtime.
• Fluency in the advanced type system, module resolution, bundlers and transpilers, and the Node and browser runtimes.
• Precise written English: the questions and rubrics you write are the product.
• Comfortable with git at commit level, containerized environments, and command-line tooling.

Preferred

• Experience with developer tooling, compilers, test frameworks, GraphQL servers, or state machines.

Compensation & Legal

• Payment is per approved task; every task is reviewed by a second engineer and a super reviewer before acceptance., Analysis Skills, Artificial Intelligence (AI), Benchmarking, Command Line, Editing, Engineering, English Language, Git, GraphQL, Legal, Machine Tool, Programming Tools, Public/Media/Press/Analyst Relations, Research Laboratory, Software Engineering, Technical Analysis, Technical Presentation, Testing, Training/Teaching, Transpiler, Web Browsers

Mercor connects elite creative and technical talent with leading AI research labs. Headquartered in San Francisco, our investors include Benchmark, General Catalyst, Peter Thiel, Adam D’Angelo, Larry Summers, and Jack Dorsey.