Sifa Ozen contributed to the wireapp/wire-avs and wireapp/kalium repositories by delivering features and fixes that improved Linux build stability, developer experience, and network quality testing. Sifa addressed a Linux build failure by tuning C++ compiler flags, ensuring reliable CI pipelines and repeatable builds. For wireapp/kalium, Sifa enhanced the Linux bootstrap process and introduced a CLI option for injecting custom SFT URLs into call configurations, leveraging C, C++, and JSON manipulation. Additionally, Sifa made the network quality handler reconfigurable with unit tests and resolved test build issues, demonstrating depth in Linux build systems, scripting, and software architecture across both projects.