I'm wondering what framework do you use to plan your product development.
Right now I'm using just Trello with a 4 lists, Planned, In-progress, Staging and Production. Works ok but I feel I can do better, like adding a progress % or something to get a better overview of my tasks.
Are you using any agile framework that's simple and good enough for a solo dev (and maybe to support a team of max 3 more devs in the near future)?
* Who will I show X feature to?
* When will I show it to them?
* Can I show them a draft?
To me, the biggest risk of solo development is not how I manage a todo list, but that I'll build the wrong thing, because I waited to get feedback.
Some things that have helped me a lot...
* set up a time to show someone your progress on feature X before you feel totally ready to.
* ask someone to try and pick up and tweak some layer of your code (or pair with them)
* if you are developing a library--record hour long screencasts where you use it in a realistic way. Prioritize issues where you say, "oh, I should fix that...". Repeat but with another person driving.
I use github projects and a calendar (the calendar appointments feel more important!)