I've worked on a consumer [mobile app](https://itunes.apple.com/app/apple-store/id1214741326?mt=8) so not everything will be directly applicable to you, but these two things helped me promote my app in the very early phase:

1. Sending DMs to hypothetical target users: I did this primarily on IG. I checked out popular accounts in the space my app was in (e.g., fashion), checked who liked their popular feed posts, and then DMed those people directly. I heard back from a significant number of people and got useful data about the market. This didn't confirm my product added real value, but helped me realize some of the target demographics I had in mind weren't a good fit for my product. One caveat is that I did this many years ago when IG didn't "hide" DMs from unrelated accounts under a tab.
2. At least for my product, almost all my best users/customers came through their organic searches in the App Store. So, ASO (App Store Optimization) worked well for me. I guess SEO is analogous to it, which has been discussed above. One additional thing maybe is that I'd recommend setting up analytics and start measuring retention early. Eventually, I think you will be interested in identifying long-term users and learn more about them.

Senior Software Engineer at Lookscope

Jay Son

Side projects

This is one of most important interview rounds, especially for engineers targeting more senior levels. However, so many engineers struggle in these interviews due to poor communication skills. Use this playlist to learn how to come across as a strong, personable hire.