This was all solo and I am having a lot of fun. I also work +70 hours a week, with 2 nights till 3am. Our customers see the emails at 5am all the time, I get a couple wellness checks here and there but I have a good rhythm and still work out 3x a week and go outside daily. I have found I can pretty much figure any development problem out now, just a matter of how much time it takes and if it's worth it.
Although each product is different and some will need bigger more specialized devs the trend is to get ultra lean. I was reading about how we'll see the first
1 person billion dollar company soon. They hedge in the article and say 1b with 3 people (ceo, product. ops) in 3-5 years. The other big takeaway is on the most important skill is selecting and managing vendors
I am more excited about doing everything in public, versus all the secrecy normally associated with development.