I don't agree that senior developers can come up to speed on any technology "pretty quick". I don't agreee that you should not ask for specific senior experien

I don't agree that senior developers can come up to speed on any technology "pretty quick". I don't agreee that you should not ask for specific senior experience with specific technologies. It takes years of working intensively with a programming language to really understand it well. If you are wanting to hire in expertise - i.e. someone who really knows how to get things done with your technology stack - then you MUST select for specific previous experience. If however you're not looking for someone with expert level skills then sure, hire openly for "smart people who get things done", but in that case, you need to be ready for the people you get to take a good chunk of time to really come up to speed - like six months at least.