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Awesome if I can help in any way I'm here!

If you are concerned about the security of the app, you should try bug bounty programs where people search for bugs in your app. I recommend www.bugcrowd.com or www.hackerone.com. You can choose to give reward for bugs or not. I think it's important for an app like this to be secure because it holds very confidential informations!

Do you have development skills?

I'm actually a Hacker by trade, I just decided to switch to design recently so I agree with you,security is very important.

Same for me, I'm more in the security field! Maybe you can find some developers here!