Position: Senior Software Engineer
Category: C++
English level: intermediate
Years of experience: 11

I was responsible for creating and maintaining cores of few telecommunication products. Links are not allowed here unfortunately. 
Few commercial and hobby products for macOS / Android / iOS as well.
Languages: C++ mostly + Python / Flutter + Delphi / C# / Java / Objective-C.

Areas: VoIP (RTP / SIP / ICE), network programming (TLS/TCP/UDP), multithreaded programming.
Software mobile development as well - Android NDK / Flutter / iOS and Android development skills.

Platforms: Linux / macOS / iOS / Android / Windows.

I was responsible for creating and maintaining cores of few telecommunication products. Many platforms, hard to debug problem cases - it is usual work for me.
Responsibility.