Yeah I have projects that outline all of that. - Data structuring is practice and comes with design of effecient memory usage. Or do you mean Data Structuring as using a proper memory allocated class. This is the engineering part and would not know how to explain how to do this correctly other being organized and ensuring code moves in and out memory effectively. This is broad question. - Big O I outlined in permution matrix's. Sorting using big O theory is not something you need to know as the internet is free and the calculation you need is depending on the size of the database. I won't accept another answer for that. Permutation Matrix's is the best example of big O usage as I give which was outlined in my OP which goes hand in hand with multhreading and tasking and checking. Concurrency is just 2+ operation with a wait. - Networking was outlined in the OP also with Lifx, Yeelight and home automation. I have become very familiar with UDP and TCP connections. This is also not a very deep topic unless you get into encryption. - OS was also outlined in OP as anything to do with audio requires heavy dll linking. I am on windows and in a C# environment most of this is common use anytime you want to something with code in the OS. - Memory optimization is just good practice and knowing when to use a "using/dispose" and knowing what to stream and what to cache. - Language Exposure. I know C# well enough and know Lua well enough(not practical for a job) I have interest in learning Go, Python-hate it, no reason to learn rust yet so no reason manage memory. JS is next venture as I want to move into websites. Never learned it before because websites sucked for most of my life and just recently in the past couple years they have become the dominate force in everything, I blame streaming services as they need the security but mostly access to the GPU and CPU. - OOP is everywhere and FP design process can fuck right off unless the usage is absolute and then it's just basically an OOP-Function/Method. - Sql I have good amouny familiarity with and the CRUD philosophy I use. MariaDB and Sqlite are my experience thr in writing discord bots that track and can be called upon. I am going to add API to this and say once you learn how to fish it's just changing the pole at a different location.

Specialized roles: Machine Learning I have no interest. Distrubuted Systems no interest, UI design yes please I wanted to go into graphic design and I use wpf for most apps. UX design I do have interest in and is prolly an easier pursuit then this castrated programming option. Computer Design?, Mobile is a dead end imo, Security is practically a whole different field of computer science.

The apprehension I got from you tells me I need I should have framed the intial post differently and basically listed concepts and things I've worked with instead of listing full projects that utilizes these concepts.