Creating cyber security software is very difficult. Think about it, the best hackers (whitehat, greyhat, and blackhat) are always looking for ways in which to break into systems for a variety of reasons. So your software needs to be able to outsmart them and patch holes faster than they can find them. Unless you can put together a team of the best software developers, it is better to try and use an out of the box solution, or even a custom solution, compared to building one yourself.
That said, you can still protect your data by following development best practices to ensure that you aren’t leaving easy access points to bad actors, even without creating a cyber security software of your own.