Remote Lean 4 Theorem Prover & Formal Math Engineer

mercor; San Francisco (CA); Hybrid; CAD 177,000 - 216,000; Part time

Job summary

Mercor is seeking a Lean Engineer with a strong background in formal mathematics to work remotely on Lean 4 and mathlib, focusing on theorem proving and formalization of mathematical statements. The role is a contract engagement with 20–40 hours per week and collaboration with AI/ML-related research teams.

You will draft correct Lean statements, review AI-generated proofs, and help establish guidelines for proof quality and mathlib conventions in a collaborative lab environment.

Qualifications

• Hands-on experience writing formal proofs in Lean 4.
• Comfort with mathlib and Lean 4 tactics.
• Strong background in proof-based mathematics or logic.
• Ability to turn statements and proofs into correct formal statements and proofs.

Responsibilities

• Write correct, idiomatic Lean 4 statements and proofs that compile against current mathlib.
• Formalize natural-language mathematics from competition problems and textbook results to research-level lemmas.
• Review AI-generated Lean statements and proofs and provide clear, specific feedback.
• Help define guidelines and rubrics for proof quality and mathlib conventions.
• Collaborate with Lean engineers and researchers to maintain consistent standards and elevate quality.

Skills

Lean 4

Mathlib

Formal proofs

Lean tactics

Communication

Education

Degree in Mathematics/CS

Tools

Lean 4

Mathlib

Job description

Mercor is seeking a Lean Engineer with a strong background in formal mathematics to work remotely on Lean 4 and mathlib, focusing on theorem proving and formalization of mathematical statements. The role is a contract engagement with 20–40 hours per week and collaboration with AI/ML-related research teams.

You will draft correct Lean statements, review AI-generated proofs, and help establish guidelines for proof quality and mathlib conventions in a collaborative lab environment.