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Formal Methods (Lean 4) Expert

Mercor

AI Expert - Mathematics Contractor Project-based
Remote (Global) $95 – $95/hr July 25, 2026

Job description

Role Overview

Mercor is seeking Formal Methods (Lean 4) Experts to help advance frontier AI systems by strengthening their formal reasoning capabilities. In this fully remote contract role, you will create expert-level theorem-proving and formal verification challenges, review technical content authored by other specialists, and evaluate AI-generated proofs and formalizations for correctness, rigor, and logical soundness.

This opportunity is ideal for researchers and engineers with deep expertise in interactive theorem proving, formal verification, and proof assistants such as Lean 4, Coq, Isabelle, or Agda.

Key Responsibilities

Develop Formal Methods Problems

  • Design expert-level problems covering theorem proving, program verification, and mathematical formalization.
  • Create technically rigorous evaluation tasks suitable for frontier AI models.
  • Produce accurate reference solutions and formal specifications.

Review Technical Content

  • Review problems created by other experts for clarity, correctness, and appropriate difficulty.
  • Validate formal proofs and ensure reliable ground-truth solutions.
  • Recommend improvements to increase technical quality and precision.

Evaluate AI Proofs

  • Assess AI-generated proofs, tactics, and formalizations.
  • Compare model outputs against expert standards.
  • Deliver Accept, Revise, or Reject decisions with detailed written rationale.

Required Qualifications

  • Strong background in formal verification or interactive theorem proving.
  • Hands-on experience with one or more of:

- Lean 4

- mathlib

- Coq

- Isabelle

- Agda

  • Familiarity with:

- Type Theory

- Mathematical Logic

- Program Verification

  • Strong technical writing skills.
  • Excellent attention to detail.

Preferred Qualifications

  • Experience formalizing mathematical proofs.
  • Experience reviewing formal verification projects or research.
  • Interest in AI model evaluation and automated reasoning.

Compensation

  • $95 per hour
  • Weekly payments via Stripe or Wise

Work Arrangement

  • Fully Remote
  • Independent Contractor
  • Flexible schedule
  • Project-based engagement with opportunities for extension based on project needs and performance
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Frequently asked questions

Is Mercor legitimate?
Yes, Mercor is a legitimate company listed on RemoWork. We verify all companies on our platform. However, we always recommend doing your own research before sharing personal information or starting work. Check reviews from other users and visit the company's official website for the most up-to-date information.
How do I get started with Mercor?
To get started, visit Mercor's official website and look for their careers or sign-up page. Create an account, complete your profile with relevant skills and experience, and apply for available positions or projects. Some companies may require you to pass a qualification test or assessment before you can start working.
Does Mercor offer remote work?
Yes, Mercor offers remote work opportunities. Most tasks and positions can be completed from anywhere with a reliable internet connection and a computer or smartphone. Specific location requirements may vary by project or role, so check individual listings for details.
How does Mercor pay its workers?
Payment methods and schedules vary. Common payment options include PayPal, bank transfers, Payoneer, and other digital payment platforms. Visit Mercor's official website or check their payment/FAQ section for specific details about payment methods, minimum thresholds, and payout schedules.
What skills do I need to work with Mercor?
Required skills vary by role and project. Generally, you'll need a reliable internet connection, basic computer literacy, strong attention to detail, and good communication skills. Some positions may require specialized expertise, language proficiency, or technical qualifications. Check individual job listings for specific requirements.
What is Mercor's vetting process like?
Mercor uses an AI-powered vetting process that evaluates candidates through technical assessments, interviews, and skill verification. The platform matches vetted talent with companies looking for specific expertise. The process is designed to be efficient and identify top-tier professionals quickly.
What types of roles does Mercor offer?
Mercor connects professionals with AI engineering, software development, data science, machine learning, and other tech-focused roles. The platform works with startups and enterprises, offering both contract and full-time remote positions across various technical domains.
Is Mercor free for job seekers?
Yes, Mercor is free for job seekers and freelancers. The platform earns revenue from companies hiring through the network. Candidates can create profiles, get vetted, and apply for positions at no cost.
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