> I've implemented several medium-scale projects that I anticipate would have taken 1-2 weeks manually
A 1-week project is a medium-scale project?! That's tiny, dude. A medium project for me is like 3 months of 12h days.
A 1-week project is a medium-scale project?! That's tiny, dude. A medium project for me is like 3 months of 12h days.
The point that I'm trying to emphasize is that I've had success with it on projects of some scale, where you are implementing (e.g.) multiple related PRs in different services. I'm not just using it on very tightly scoped tasks like "implement this function".
The observation I was trying to make is that at the scope of one week, there's very little you actually get done, and it's likely mostly mechanical work. Given that, I suppose I'm unsurprised LLMs are proving useful. Seems like that's the type of thing they're excelling at.
Concretely speaking (well as concretely as I feel like being without piercing pseudonymity), at my last job I worked on a multi year rewrite of one of our core services. Within that rewrite were ton of much smaller projects that were a few weeks to a month long - refactor this algorithm, improve the load balancing, add a new sharding strategy, etc. An AI tool would definitely not have sped up the whole process. It's not going to, say, speed up figuring out and handling intra-team dependencies or figuring out product design. But speeding up those smaller coding subprojects would have been a huge benefit.
I'm not making any strong claims in my post. I don't have the experience of AI projects allowing me to one shot large projects. But OP asked if anyone has concrete experience with AI coding tools speeding up development, and the answer is yes, I do.