Brun worked on packaging and release engineering for the coq/opam repository, focusing on MathComp library updates. He delivered new opam definitions, dependency specifications, and build instructions for the v2.4.0 core libraries and v2.2.0 finmap, using OCaml and Coq to ensure reproducible builds and streamlined downstream integration. His approach included adding explicit metadata and tarball source distributions, which improved release traceability and maintainability. Although no major bugs were addressed during this period, Brun’s work emphasized package management and release processes, resulting in clearer release artifacts and more reliable deployments for mathematical libraries within the Coq ecosystem.