I've been interviewing for a QA position with a software company. I had spoke about an (Android) app I have been making and they asked to see the source code. I told them it's not publicly available (in the sense it's not on Github) as the app contains sensitive information like my address and ssn. They said I can redact/remove it, and I think that should be fine.
My only concern is, is there something I'm not thinking about giving a software company an app that isn't publicly available? I have no reason to assume this but I wouldn't want them to steal my work or ideas. Also in the future I may decide to publicly release the app (probably open source and free).
They asked me to email them the source code, should I use any "legal language" in the email? Should I simply say "please don't share this with anyone?" or what?
The app itself is nothing fancy, it basically helps me to fill out a form I have to keep filling out.