40 doesn't matter. There may be some pockets of ageism but ignore it (a rejection is always a mystery anyway). So go for what you want. You need a you-compatiab

40 doesn't matter. There may be some pockets of ageism but ignore it (a rejection is always a mystery anyway). So go for what you want. You need a you-compatiable job not a 40s-compatiable job. That said I am happy 40's person working at a 10k-100k person tech company. It turned out good so far. There is a bit more bureaucracy but happy to pay that small tax. Also you have to like microservices :) It is very interesting. I have technically interesting work and a humble smart team.