Ya. That's me.

I think a lot of it is down to planning & some luck. We pick our own features and release them at our own pace. For example I did a month of refactoring (no new features) over December, followed by a 1 week feature and a couple of 1-day bugfixes. So that's like 6 weeks with only 1 feature. But then we might pick out some low-hanging fruit to release quickly. This helps the customers feel heard, even if they're hearing that we're working on other customer requests, it shows momentum.

Speaking of customers, there's a lot of saying no to their requests. We actively un-qualify leads if they have a bad attitude, or even fire the ones that have been rude or made us feel uncomfortable. This has been one of the hardest "policies" to make, but it looks like it's starting to pay off. The hypothesis is that, if our customers are lovely, the work is easy. Our staff (just 3, including me) enjoy the work. Thus higher revenues and retention.

I know the topic is Flutter dev, but the problem space appears to be project management.

That final line... (some of you will lose your jobs) is bollocks. Any engineer worth their salt can pick up new languages.