Worked on the zed-industries/zed repository to deliver two backend features focused on improving dev container reliability and compatibility. Developed robust bare variable expansion for Dockerfiles by introducing a helper in Rust, ensuring accurate $VAR substitution and comprehensive unit testing. Added a configuration setting to enable the classic Docker builder for environments lacking BuildKit, such as Apple Container, enhancing cross-engine support. Updated documentation and expanded test coverage to reflect these changes, with end-to-end validation confirming compatibility in Rails dev container scenarios. The work demonstrated a methodical approach to backend development, DevOps, and Docker integration, addressing real-world build environment challenges.