
Lean Engineer, Formal Mathematics β Lean 4, Mathlib, Theorem Proving
Posted 2 hours ago

Posted 2 hours ago
This is a fully remote position, open to applicants in United States.
β’ Compose accurate and idiomatic Lean 4 statements and proofs that compile with the current mathlib.
β’ Formalize mathematical content from natural language, including competition problems, textbook results, and research-level lemmas.
β’ Assess AI-generated Lean statements and proofs.
β’ Identify inaccuracies in proofs or those that yield incorrect conclusions, providing clear and constructive written feedback.
β’ Assist in establishing guidelines and rubrics for proof quality, statement accuracy, and mathlib conventions.
β’ Collaborate with Lean engineers and research lab personnel to uphold consistent standards.
β’ Engage in projects focused on training and enhancing AI systems.
β’ Practical experience in writing formal proofs using Lean 4.
β’ Proficiency with mathlib and Lean 4 tactics, including the ability to locate and utilize relevant lemmas.
β’ Strong foundation in proof-based mathematics, theoretical computer science, or logic, supported by a degree or research history.
β’ Capability to transform written statements and proofs into accurate formal statements and validate proofs.
β’ Availability for a minimum of 20 hours per week during weekdays.
β’ Excellent written communication skills and the ability to articulate proof strategies and formalization decisions clearly.
β’ Preferred: experience with Coq/Rocq, Isabelle, Agda, Haskell, Lean metaprogramming, or AI applications in mathematics.
β’ Unable to accommodate H1-B or STEM OPT candidates at present.
β’ W-2 employment through Cincinnatus LLC (or the relevant international entity).
β’ Payroll, benefits, and compliance managed by the employer of record.
β’ Fully remote work environment.
β’ Flexible scheduling / ability to work at your own pace.
β’ Weekly payments facilitated through Stripe or Wise.
β’ Opportunity to work alongside leading researchers.
β’ Referral bonuses of up to $1,760 for each successful referral.
Mercor
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