Daniel contributed to both the mozilla/gecko-dev and thunderbird/thunderbird-android repositories, focusing on build system configuration, schema definition, and version management using Gradle, Kotlin, and Python. In mozilla/gecko-dev, he enhanced the Treescript payload builder by adding an optional actions parameter, allowing more flexible task execution and aligning the schema with previous stability improvements. For thunderbird-android, Daniel managed a version bump to 13.0 across multiple Android modules, standardizing release processes and ensuring consistent upgrade paths without functional code changes. His work demonstrated careful attention to automation, cross-module consistency, and collaboration with review teams, reflecting a methodical engineering approach.