C/C++ programming for userland Linux middleware/backend/application. Multithreading - preemptive (using coroutines) and concurrent. Implement communication with Postgres, SQLite DB and SOLR nosql data storage. Implement interserver communication using TCP/IP or UDP. Also, I have some experience with Qt3 and Qt4 libraries.
The backends I implemented include:
Also I was involved in runtime library development for SYCL compiler.
Support for CMake, makefile, bash scripting, etc.