Would developing your own Bitcoin Wallet be safer than using known ones like Electrum? It would obviously be much simpler, with no GUI, worse overall security but no one could get their hands on its source code. I have enough programming experience myself to make it but I'm wondering if it even makes sense to do so.
Thank for your help!
The first thing most programmers do usually before they contemplate in coding anything, is, find out if anyone has solved the problem they want to solve. In this case the answer is yes. There are more than a handful of wallets that are secure.
I don't see a need to code your own wallet, unless you want to do it as a project for the learning experience. The electrum wallet is a great lite wallet, and there are others.