Formal Methods (Lean 4) Expert
Mercor • Remote
Education
Any
Type
hourly
Pay Rate
$95/hr
Listed
4d ago
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About this Role
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
Why This Role
Shape the "brain" of future AI. By working as a Formal Methods (Lean 4) Expert, you ensure that future models understand the nuance of your field. At $95/hr, it's a lucrative way to preserve the integrity of your profession in the digital age.
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Frequently Asked 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.
Does it cost money to apply to Mercor?
No, applying and joining Mercor is free. Mercor's revenue comes from a fee it charges the client on top of your hourly rate, not from applicants. Treat any request for payment to join as a red flag.
Is AI training work the same as traditional consulting?
No. Instead of client deliverables, you're given complex scenarios to evaluate: grading the AI's logic, correcting its hallucinations, and supplying expert-level reasoning it doesn't have on its own. The job is closer to teaching than consulting.
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 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.