Lean Engineer, Formal Mathematics, Lean 4, Mathlib, Theorem Proving

🔥 2 minutes ago

🇺🇸 United States – Remote

💵 $90 - $110 / hour

⏱ Part Time

🟡 Mid-level

🟠 Senior

👷🏻‍♀️ Engineer

👻 Ghost score 9%

What it means: how likely this posting is sitting open without active hiring.How to read it: 60% or higher means we think this is a ghost. Lower scores are less of a worry.How we score it: age, reposts, open roles vs team size, how fast jobs close, and whether pay is listed.Fine print: an estimate from public data, not a judgment of the company. Real jobs can score high, so treat it as a hint, not a fact.

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Mercor

WebsiteLinkedInAll Job Openings

51 - 200 employees

Founded 2023

🔥 Funding within the last year

💰 $350M Series C - Mercor on 2025-10

Mercor is a company for which no descriptive text was provided in the input. Additional information (products, services, target customers, or industry specifics) is needed to create an accurate summary and select appropriate industries.

📋 Description

• Write correct, idiomatic Lean 4 statements and proofs compiling against current mathlib • Work across algebra, analysis, number theory, combinatorics, and logic • Formalize natural-language mathematics, including competition problems, textbook results, and research-level lemmas • Review AI-generated Lean statements and proofs • Identify failures or cases where proofs establish the wrong claim • Provide clear, specific written feedback • Help define guidelines and rubrics for proof quality, statement fidelity, and mathlib conventions • Collaborate with Lean engineers and lab researchers to maintain consistent standards and improve quality • Work on projects training and enhancing AI systems

🎯 Requirements

• Hands-on experience writing formal proofs in Lean 4 • Comfort with mathlib and Lean 4 tactics, including finding and using appropriate lemmas • Strong background in proof-based mathematics, theoretical computer science, or logic through a degree or research record • Ability to turn written statements and proofs into correct formal statements and checking proofs • Ability to engage reliably for at least 20 hours per week during weekdays • Clear written communication and ability to explain proof strategy and formalization choices precisely • Nice to have: experience with Coq/Rocq, Isabelle, Agda, Haskell, Lean metaprogramming, or AI-for-math work • Must not be an H1-B or STEM OPT candidate, as sponsorship/support is unavailable

🏖️ Benefits

• Part-time schedule of at least 20 hours per week, with the option to increase to up to 40 hours per week • Fully remote work on your own schedule • W-2 employment, payroll, benefits, and compliance through Cincinnatus LLC or an appropriate international entity • Weekly payments via Stripe or Wise based on services rendered • Competitive pay • Opportunity to collaborate with leading researchers • Opportunity to help shape the next generation of AI systems • Referral payments of up to $1,760 per successful referral