Lean Engineer, Formal Mathematics (Lean 4, Mathlib, Theorem Proving)
- Pay: $90 to $110 / hour
- Contract: Part time
- Who can apply: Open worldwide
- Posted Sep 30, 2026
In short
You can earn between 90 and 110 USD per hour as a Lean Engineer helping a leading AI lab teach models to write machine-checked mathematics. This remote, part-time role offers 36 openings, making it a great fit if you have formal math skills and want flexible hours.
What you will do
- Write Lean 4 statements and proofs that compile against mathlib.
- Turn natural-language math into precise formal statements.
- Review AI-generated proofs and give specific written feedback.
- Help define guidelines and rubrics for proof quality.
What you need to apply
- Hands-on experience writing formal proofs in Lean 4.
- Comfort with mathlib and Lean 4 tactics.
- Background in proof-based mathematics, theoretical computer science, or logic.
- Availability for at least 20 hours per week during weekdays.
Who can apply
This remote position is open worldwide, and you can apply from any country.
My tip
At Simply Remotely, we suggest highlighting your specific experience with Lean 4 and mathlib clearly in your application to stand out.