Lean 4 Formal Mathematics Engineer (Remote, 20–40 hrs/wk)

Mercor; San Francisco (CA); Hybrid; GBP 94,000 - 115,000; Part time

Job summary

Mercor seeks a Lean Engineer to advance formal mathematics using Lean 4 and mathlib in a remote, contract role. You will craft correct proofs, translate problems into formal statements, and review AI-generated Lean content for accuracy.

Applicants should have hands-on Lean 4 experience, comfort with mathlib tactics, and a strong proof-based math or logic background, with a commitment of 20–40 hours per week during weekdays.

Qualifications

• Hands-on experience writing formal proofs in Lean 4.
• Comfort with mathlib and Lean 4 tactics.
• Strong background in proof-based mathematics, theory CS, or logic.
• Ability to turn a written statement and proof into a formal statement and proof.
• Engage reliably for at least 20 hours/week during weekdays.
• Clear written communication and ability to explain proof strategy precisely.

Responsibilities

• Write Lean 4 statements and proofs that compile against mathlib.
• Formalize natural-language mathematics from problems to lemmas.
• Review AI-generated Lean statements and proofs with feedback.
• Help define guidelines for proof quality and mathlib conventions.
• Collaborate with Lean engineers to maintain standards.

Skills

Lean 4

Mathlib

Theorem Proving

Coq/Rocq

Haskell

Education

Degree in mathematics or theoretical CS

Tools

Lean 4 metaprogramming

AI-for-math tooling

Job description

Mercor seeks a Lean Engineer to advance formal mathematics using Lean 4 and mathlib in a remote, contract role. You will craft correct proofs, translate problems into formal statements, and review AI-generated Lean content for accuracy.

Applicants should have hands-on Lean 4 experience, comfort with mathlib tactics, and a strong proof-based math or logic background, with a commitment of 20–40 hours per week during weekdays.