About this opportunity
Confidential lists this Lean Engineer, Formal Mathematics opportunity in Jollyville, Texas. Review the employer’s description below for duties, qualifications and application requirements.
Job description
Role Overview
Help advance AI systems that produce real, machine-checked mathematics in Lean. In this role, you will write and assess Lean 4 proofs, translate informal mathematical ideas into precise formal statements, and evaluate whether model-generated proofs establish the intended result, not merely something accepted by the checker.
Key Responsibilities
Write correct, idiomatic Lean 4 statements and proofs that compile against current mathlib across algebra, analysis, number theory, combinatorics, and logic.
Formalize natural-language mathematics, including competition problems, textbook results, and research-level lemmas, while ensuring the formal statement faithfully reflects the original.
Review AI-generated Lean statements and proofs, identify failures or unintended conclusions, and provide clear written feedback.
Develop guidelines and rubrics for proof quality, statement fidelity, and mathlib conventions.
Collaborate with Lean engineers and researchers to maintain consistent standards and improve proof quality.
Qualifications
Hands-on experience writing formal proofs in Lean 4, such as through mathlib contributions, a formalization project, a Lean library or tool, or autoformalization work.
Comfort using mathlib, Lean 4 tactics, and relevant lemmas.
A strong background in proof-based mathematics, theoretical computer science, or logic through a degree or research record.
Ability to convert written mathematical statements and proofs into correct formal statements and machine-checked proofs.
Clear written communication and the ability to explain proof strategies and formalization choices precisely.
Preferred Experience
Experience with Coq/Rocq, Isabelle, Agda, Haskell, Lean metaprogramming, or AI-for-mathematics work such as LLM provers, Lean agent environments, miniF2F, ProofNet, or PutnamBench.
Not every preferred qualification is required to apply.
Work Terms
Remote, hourly W-2 employment.
Commitment of at least 20 hours per week on weekdays, with the option to work up to 40 hours per week.
Employees may be placed with an AI lab as part of its extended workforce.
Compensation
$90 to $110 per hour.
Equal Opportunity
Employment decisions are made without discrimination based on race, religion, color, national origin, sex, including pregnancy, childbirth, reproductive health decisions, related medical conditions, sexual orientation, gender identity, gender expression, age, protected veteran status, disability, genetic information, political views or activity, or any other legally protected characteristic.
Who can apply
Review the original listing for work authorization, qualifications and employer requirements.