Alignerr is seeking Lean 4 Proof Engineers to translate advanced human-written mathematical proofs into machine-verifiable formalizations to improve AI reasoning. Candidates should hold a Master's degree or higher in a mathematical field and have hands-on experience with proof assistants like Lean, Coq, or Isabelle/HOL. This is a fully remote, flexible freelance role offering $170-$200 per hour for 10-40 hours of work per week.