AlignerrDomain experts
Lean 4 Mathematical Formalization Expert
up to $200/hr
About this role, in Alignerr's words
What if your deep expertise in formal mathematics could directly shape how AI reasons, proves, and verifies mathematical truths? We're looking for Lean 4 specialists to translate complex mathematical arguments into precise, machine-checked formalizations — working at the frontier where mathematics meets artificial intelligence.
What you'll do
- Formalize mathematical content from natural language sources — textbooks, articles, and exercises — into valid, compilable Lean 4 code
- Translate theorems, lemmas, propositions, and proofs into precise formal representations using Lean 4
- Ensure formal code accurately captures the mathematical meaning and logical structure of the original statements
Show all 6 itemsHide the other 3 in What you'll do
- Review and validate Lean 4 formalizations for correctness, consistency, and logical soundness
- Identify ambiguities, missing assumptions, or logical gaps in informal mathematical descriptions
- Contribute to high-quality datasets pairing human-written mathematics with formal Lean 4 equivalents for AI training
Candidate background
Who You Are
- Strong hands-on experience with Lean 4 — you write precise, correct, and maintainable code
- Solid background in mathematics, formal logic, or formal verification
- Comfortable reading advanced mathematical texts and translating them into formal systems
- Exceptional attention to detail and a rigorous logical mindset
- Interested in AI, automated reasoning, and the future of mathematical verification
- Self-directed and reliable when working independently on complex, open-ended problems
Nice to Have
Show all 4 itemsHide these 4 items in Nice to Have
- Experience with other theorem provers or formal systems (Coq, Isabelle, Agda, Metamath, etc.)
- Prior involvement in AI training, expert annotation, or reasoning-focused datasets
- Background in formal methods research or proof assistant development
- Academic or professional experience in pure or applied mathematics
Quoted from selected sections of Alignerr's posting. The full posting may state other conditions. Read the full posting
A closer look
More context, when you need it.
Full job descriptionThe original posting, in Alignerr's words
Posted by Alignerr, reproduced here so you can judge the role before clicking. Original posting ↗
Lean 4 Mathematical Formalization Expert (AI Training)
About the Role
What if your deep expertise in formal mathematics could directly shape how AI reasons, proves, and verifies mathematical truths? We're looking for Lean 4 specialists to translate complex mathematical arguments into precise, machine-checked formalizations — working at the frontier where mathematics meets artificial intelligence.
This is a fully remote, flexible contract role built for mathematicians and formal verification experts who want to do genuinely challenging, high-impact work on their own schedule.
- Organization: Alignerr - Type: Hourly Contract - Location: Remote - Commitment: Flexible — work on your own schedule
What You'll Do
* Formalize mathematical content from natural language sources — textbooks, articles, and exercises — into valid, compilable Lean 4 code * Translate theorems, lemmas, propositions, and proofs into precise formal representations using Lean 4 * Ensure formal code accurately captures the mathematical meaning and logical structure of the original statements * Review and validate Lean 4 formalizations for correctness, consistency, and logical soundness * Identify ambiguities, missing assumptions, or logical gaps in informal mathematical descriptions * Contribute to high-quality datasets pairing human-written mathematics with formal Lean 4 equivalents for AI training
Who You Are
* Strong hands-on experience with Lean 4 — you write precise, correct, and maintainable code * Solid background in mathematics, formal logic, or formal verification * Comfortable reading advanced mathematical texts and translating them into formal systems * Exceptional attention to detail and a rigorous logical mindset * Interested in AI, automated reasoning, and the future of mathematical verification * Self-directed and reliable when working independently on complex, open-ended problems
Nice to Have
* Experience with other theorem provers or formal systems (Coq, Isabelle, Agda, Metamath, etc.) * Prior involvement in AI training, expert annotation, or reasoning-focused datasets * Background in formal methods research or proof assistant development * Academic or professional experience in pure or applied mathematics
Why Join Us
* Work on cutting-edge AI projects alongside leading research labs * Fully remote and flexible — work when and where it suits you * Freelance autonomy with the structure of clearly defined, meaningful tasks * High-impact work — your formalizations directly improve how AI models reason about mathematics * Top performers are invited to advanced tracks and extended contracts with greater scope and responsibility
Working with AlignerrPay, getting started and work, from Alignerr's own pages
What the platform publishes in general. These are not extra terms confirmed for this particular role.
- Getting paid
- Billed weekly, Monday to Sunday, with approved work paid by the following Friday, according to Labelbox's help center. Payment goes through Stripe Connect or PayPal depending on your location, with one provider per country. intercom.help/labelbox/en/articles/13600616-alignerr-paym..., alignerr.com/process
- Before your first paid task
- Sign up, apply, verify your identity, set up billing and onboard. Some jobs add a Zara AI interview or domain assessments. alignerr.com/process
- How much work
- Time to your first project depends on demand and your skills, and there is no minimum number of hours. alignerr.com/faqs
- Contract
- Independent contractor, under terms with ALIGNERR LLC. alignerr.com/faqs, alignerr.com/privacy
Read on the pages linked above on 24 Sep 2026. Platforms change these terms, so check the linked page before you rely on one.
How does the pay compare?Across Domain experts roles, not this role alone
From our own daily reads of every open listing on the platforms we follow, not from Alignerr's posting. How we count.
Pay across the field: Domain experts
Across 699 roles in this field with a stated hourly rate in US dollars, on 18 platforms, the middle half pays $65 to $130 an hour at the top of the range, and the median is $100. This role's top rate, $200, is in the top quarter. Of the 261 distinct rates we count, 236 are lower and 15 are higher.
| Platform | Roles | Top of range, per hour |
|---|---|---|
| Alignerr (this platform) | 148 | $24 to $200 · median $80 |
| micro1 | 136 | $28 to $400 · median $110 |
| AfterQuery | 88 | $45 to $175 · median $100 |
| Handshake AI | 79 | $30 to $300 · median $85 |
| Mercor | 78 | $55 to $450 · median $120 |
Sources and listing historyWhere this information comes from
This listing's history
- First seen here on 27 Aug 2026, and still on Alignerr's list when we last read it on 13 Oct 2026.
- The listed pay has not changed since then.
- Posted by Alignerr
- First seen by AIPayList
- Last seen live
- Listing ID
- cacb1f43-f6b2-4af7-a525-c54cc62e7aaf
Pay as the source states it: “$170-200/hr”.
Platforms sometimes change a rate after posting. Every listing here is re-read at least once a day and corrected when its source moves, so a difference you see on the platform is usually a change made since the last read. How freshness works.
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