Worked on the model-checking/verify-rust-std repository to deliver formal verification proofs for NonZero integer operations in Rust, focusing on core numeric methods such as rotate_left, rotate_right, cmp, max, min, clamp, and count_ones. Leveraged the Kani verification tool to rigorously check correctness across multiple integer sizes and signedness, ensuring edge-case behaviors were properly handled. This effort integrated formal verification into the Rust verification suite, enhancing reliability and safety guarantees for downstream users. The work demonstrated practical application of formal verification, Rust programming, and testing skills, contributing to improved confidence in the correctness of standard numeric operations.