I also wanted to familiarize myself with a frontend framework. I am a very experienced Go developer, but this is my first webapp built with vuejs (or any JS framework for that matter). Honestly, as a full-stack developer, I used to feel like frontend was something I had to 'endure', but vuejs somehow managed to make it quite enjoyable.
I'm always interested in teaming up with intelligent and like-minded people; not necessarily for note.delivery, but it would be ideal to begin with a small-size project to see if we are a good fit. As for note.delivery, I see several potential revenue streams, e.g. by including user support, allowing customers to store their notes on an account, or obtain the ability to write notes that only they themselves could delete, or to let notes automatically delete after X amount of time, or let us post a physical mail on their behalf without anyone being able to associate that mail to them, etc.
Ideally, I'd like to find someone who's great at marketing, selling, or have good connections. I'd also love to team up with a talented artist (for game dev). As for fellow developers, the ideal partner would be someone who's great at building scrapers, or capable of building great native applications.