Senior Lean Engineer & Formal Mathematician ($90-$110/hr)

APPLY DIRECTLY HERE: https://t.mercor.com/ltxOi
Role Overview A leading AI research lab is looking for Lean Engineers, Formal Mathematicians, and Proof Engineers to help its AI models state and prove mathematics correctly. In this remote role, you will write and review Lean 4 proofs, turn informal mathematics into precise formal statements, and evaluate whether AI-generated proofs are mathematically sound and faithful to the original intent.
Key Responsibilities
Write correct, idiomatic Lean 4 statements and proofs that compile against current mathlib across areas such as algebra, analysis, number theory, and combinatorics.
Formalize natural-language mathematics (from competition problems to research-level lemmas) into precise Lean 4 code.
Review AI-generated Lean statements and proofs, identify logical failures, and provide clear, specific written feedback.
Collaborate with AI researchers to define guidelines and rubrics for proof quality and mathlib conventions.
Core Qualifications
Technical Experience: Hands-on experience writing formal proofs in Lean 4 (e.g., mathlib contributions, a formalization project, or autoformalization work).
Ecosystem Knowledge: Strong comfort with mathlib, Lean 4 tactics, and finding/using the right lemmas.
Academic Background: A robust background in proof-based mathematics, theoretical computer science, or logic.
Communication: Fluent in written English, with the ability to clearly explain proof strategies and formalization choices.
Availability: Ability to engage reliably for at least 20 hours/week during weekdays (with the option to increase up to 40 hours/week).
Nice to have (but not required): Experience with other proof assistants (Coq/Rocq, Isabelle, Agda), Lean metaprogramming, or AI-for-math work (LLM provers, miniF2F).
Engagement Details & Compensation
Work Structure: 100% remote, independent contractor status. Flexible schedule.
Compensation: Highly competitive rate ranging from $90.00 to $110.00 per hour, depending on expertise.
Payments: Processed securely and weekly via Stripe or Wise based on services rendered.
(We consider all qualified applicants without regard to legally protected characteristics and provide reasonable accommodations upon request.)

Work arrangement
Yes