OS & Programming concepts with language proficiency: C, C++, Multi-threading, Concurrency, Cmake build system, Cross compilation, Linux understanding (process, filesystem, permission, memory), Linux shared library analysis, Linux IPC/message queues, Parse & analyze journald logs, Debug core dump files, Troubleshooting. Expert OS & programming skill: Boost ASIO, Linux boot-up, Linux interprocess communication, Linux Services/Daemon, Socket Programming, OOAD (Object-Oriented Analysis and Design), C++ 14 & 17 features (std: optional, std: async etc.).