Alignerr is seeking Lean 4 Proof Engineers to translate complex mathematical proofs into machine-verifiable formalizations to help train advanced AI systems. Candidates should hold at least a Master's degree in Mathematics or a related field and have hands-on experience with proof assistants like Lean 4, Coq, or Isabelle/HOL. This is a fully remote, flexible freelance position offering $170-$200 per hour.