Hi fellow founder here, just sharing some thoughts. Agree that with AI more eng work can now be handled by a senior dev but a good junior dev using AI is also more capable than ever. I think with a good process in place, you can ramp up a junior dev sooner rather than later. And as good as AI is, there's still a human bottleneck, so I'd assess the quantity of work you have vs. the technical complexity

It's a tough time to make those decisions. I really don't know what juniors will do. Continuity is a real cost, but a long term one. So, early on definitely doesn't make sense, especially when you are laying a foundation. But afterwards, you have to have some form of continuity to maintain the product and the cheapest and best way would be to bring on young talent.