Lean Proof Engineer - Mathematical Formalization

Lean 4 Proof Engineer
- Mathematical Formalization

What if your deep mathematical training could directly shape the future of AI - by pushing the boundaries of what machines can understand, verify, and reason about?

We're looking for mathematicians and formal verification specialists to translate rigorous mathematical arguments into machine-verifiable Lean 4 proofs for cutting-edge AI research. This role sits at the frontier of mathematics and computer science, where human intuition meets the precision of formal proof systems.

This is a fully remote, flexible contract role - ideal for someone who finds genuine satisfaction in the challenge of expressing elegant mathematical arguments in a form a machine can verify.

• Organization:
  Alignerr
• Type:
  Hourly Contract
• Location:
  
  Remote
• Commitment: 10-40 hours/week

• Translate informal mathematical proofs into clean, structured Lean 4 formalizations with an emphasis on clarity, correctness, and reproducibility
• Analyze proofs across domains - identifying gaps, hidden assumptions, and formalizable sub-structures
• Work at the frontier of formal verification, constructing proofs that test or exceed the current capabilities of automated provers
• Investigate where automated provers break down and articulate why - missing lemmas, complexity limits, insufficient libraries
• Collaborate with researchers to design and refine strategies for improving formal verification pipelines
• Guide proof decomposition, lemma selection, and structuring techniques for formal models
• Formalize classical proofs and compare machine-verifiable structures against textbook arguments
• Develop Lean proofs that surface deeper patterns or generalizations implicit in the original mathematics

• Hold a Master's degree or higher in Mathematics, Logic, Theoretical Computer Science, or a closely related field
• Strong foundation in rigorous proof writing across areas such as algebra, analysis, topology, logic, or discrete mathematics
• Hands-on experience with Lean (Lean 3 or Lean
  4), Coq, Isabelle/HOL, Agda, or comparable proof assistants
  - Lean 4 strongly preferred
• Able to translate dense informal arguments into clean, structured formal proofs
• Deeply enthusiastic about formal verification, proof assistants, and the future of mechanized mathematics

• Familiarity with type theory, the Curry-Howard correspondence, and proof automation tools
• Experience contributing to large-scale formalization projects such as Mathlib
• Exposure to theorem provers where automated reasoning frequently fails or requires manual scaffolding
• Prior experience with data annotation, quality evaluation, or AI training workflows
• Strong communication skills for articulating formalization decisions, edge cases, and reasoning strategies

• Work on genuinely frontier problems at the intersection of mathematics and AI
• Collaborate with world-leading AI research teams and labs
• Fully remote and flexible - work when and where it suits you
• Freelance autonomy with the structure and intellectual depth of meaningful research-adjacent work
• Gain exposure to how advanced AI models are trained and evaluated
• Potential for ongoing work and contract extension as projects evolve