Formal Methods (Lean 4) Expert
Mercor • Remote
Education
Not stated
Type
Hourly
Pay Rate
$95/hr
Listed
70d ago
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From the Mercor listing
Role Overview
Mercor is partnering with a leading AI lab to strengthen expert-level reasoning in frontier models. We are hiring formal-methods experts to author and review challenging formal-verification and theorem-proving problems and to evaluate AI-generated proofs and formalizations for correctness and rigor.
What You'll Do
- Design expert-level problems in formal methods: theorem proving, program verification, and formalization of mathematics
- Review problems authored by peers for clarity, genuine difficulty, and ground-truth correctness
- Evaluate and compare AI model outputs (proofs, tactics, formalizations), delivering Accept / Revise / Reject verdicts with detailed written rationale
Ideal Qualifications
- Strong background in formal verification / interactive theorem proving, with hands-on experience in Lean 4 (and mathlib), Coq, Isabelle, or Agda
- Familiarity with type theory, mathematical logic, and program verification
- Strong technical writing and meticulous attention to detail
Requirements
- Must be eligible to work in Remote
- Fluent proficiency in English (Written & Verbal)
- Reliable high-speed internet connection
- Bachelor's degree or equivalent professional experience
- Demonstrated expertise in Mathematics
How long hiring takes
Across the AI training platforms we refer candidates to, the median gap between referral and hire is about 30 days. It varies by platform and role, so treat it as a rough guide for this one.
Talent Pool members
Apply through this link and we can put you forward to Mercor when your profile is a strong match. Not every applicant is submitted. If you're not in the pool yet, set up your profile first.
Set up your profile →Why this role
Few outlets pay Mathematics specialists what the leading AI labs pay for direct judgment. At $95/hr, this Formal Methods (Lean 4) Expert role prices in the expertise itself, separate from hours billed or clients managed.
Talent pool
We're light on Mathematics candidates
We've matched 65 people with a Mathematics background against 726 Mathematics listings we've tracked, so most go out without one. Set up a profile and we'll consider you for a role like this one.
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Common questions
Is Mercor for freelancers or full-time contractors?
Mercor places you with one client for a defined engagement, like 'Python Tutor for 3 months', rather than having you grab small tasks from a shared queue. Most roles function as steady contract work, not one-off gigs.
Does Mercor's application require an on-camera interview?
Yes, every applicant records a video interview with an AI interviewer that asks questions about your resume. Clients review that recording to judge communication skills before matching, so there's no way to apply without going on camera.
Why do these AI training roles pay so much?
Because general knowledge isn't what's being tested. The model already knows the basics; what it needs is expertise on edge cases, the rare, difficult, highly technical judgment calls only a senior professional in the field would make correctly.
What does the day-to-day workload look like for elite-expert AI training roles?
Slow and deep, not fast and repetitive. A single task can take 45-60 minutes of researching citations or verifying complex calculations. Quality is what's being measured here, not throughput.
What does Mathematics work look like for a Formal Methods (Lean 4) Expert?
Tasks here are scoped to Mathematics, not generic labeling. As a Formal Methods (Lean 4) Expert, expect to draw on real domain judgment (evaluating outputs, correcting errors, or providing expert reasoning specific to Mathematics) rather than following a one-size-fits-all rubric. If you don't have hands-on Mathematics background, this is likely not the right listing to start with.
What specific skills does this listing call for?
Expert is named directly in the listing. If you don't have hands-on experience with this, expect the screening process to test for it directly rather than accepting adjacent experience as a substitute.
How much does this specific role pay?
This listing is posted at $95/hr, an hourly rate. Pay can change between when we last checked the listing and when you apply, so confirm the current number on the platform's own application page before committing time.
What happens when I click Apply on this listing?
You'll be taken to Mercor's external site to complete your application there. This listing links through a referral, but the process is identical to applying directly; the link just routes you correctly. Create an account on their site and follow their onboarding steps.
How soon will I start working after applying to Mercor?
Not immediately. Mercor is a talent marketplace, not a task queue, so applying puts you in a pool of candidates. You start working only once a specific client, like a major AI lab, selects your profile, and that matching process can take weeks.