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It worries me, if CEO of the company doesn't/can't even read the code the employees write...

I might be decent at writing PHP, C or C++, but when I started, I did really suck at writing JavaScript... That's why there is separate developer in my company that is better than me in writing JavaScript.

A lot of the front-end code for the various websites are written in client-side JavaScript and some of the backend code is written in Node.js... Remaining of the backend code is written as shell scripts or in Python, PHP and C/C++...