Formal Methods (Lean 4) Expert

Role Overview

Mercor is partnering with a leading AI lab to strengthen expert-level reasoning in frontier models. We are hiring formal-methods experts to author and review challenging formal-verification and theorem-proving problems and to evaluate AI-generated proofs and formalizations for correctness and rigor.

What You'll Do

• Design expert-level problems in formal methods: theorem proving, program verification, and formalization of mathematics
• Review problems authored by peers for clarity, genuine difficulty, and ground-truth correctness
• Evaluate and compare AI model outputs (proofs, tactics, formalizations), delivering Accept / Revise / Reject verdicts with detailed written rationale

Ideal Qualifications

• Strong background in formal verification / interactive theorem proving, with hands-on experience in Lean 4 (and mathlib), Coq, Isabelle, or Agda
• Familiarity with type theory, mathematical logic, and program verification
• Strong technical writing and meticulous attention to detail

We consider all qualified applicants without regard to legally protected characteristics and provide reasonable accommodations upon request.

Contract and Payment Terms

• You will be engaged as an independent contractor.
• This is a fully remote role that can be completed on your own schedule.
• Projects can be extended, shortened, or concluded early depending on needs and performance.
• Your work at Mercor will not involve access to confidential or proprietary information from any employer, client, or institution.
• Payments are weekly on Stripe or Wise based on services rendered.
• Please note: We are unable to support H1-B or STEM OPT candidates at this time.

About Mercor

Mercor partners with leading AI labs and enterprises to train frontier models using human expertise. You will work on projects that focus on training and enhancing AI systems. You will be paid competitively, collaborate with leading researchers, and help shape the next generation of AI systems in your area of expertise.