Denys worked on the zephyrproject-rtos/poky repository, focusing on improving build determinism and reliability in embedded systems development. He addressed nondeterminism in GCC-based build environments by removing absolute paths from include-fixed header directories and libtool scripts, ensuring reproducible builds across target, cross, and cross-canadian variants. Using Shell scripting and deep knowledge of build systems and the Yocto Project, Denys sanitized build scripts and headers to eliminate TMPDIR-related issues that previously caused QA failures. His work demonstrated a strong understanding of cross-compilation strategies and build-system hygiene, resulting in more reliable CI processes and traceable, maintainable code changes.