For a first attempt it may help to keep the focus on what you find interesting. I just built a very simple web app that connects to strava api and emails me if "i'm slacking" based on my weekly time / mileage. The UI kinda sucks right now, but it works completely off a raspberry pi and I can access it from the web. If I'm looking to hire and you have a hosted, working example to point to then I would think you're fairly capable as a developer. You can add on to it and make it nicer to show off other skills.