Comment by usgroup

This is very noticeable in London. It's a relative rarity to find a dev that's worked anywhere longer than a couple years. The simple economics of it is that until a certain salary, there is no easier way to ratchet up the pay scale then to use the negotiating leverage of having a job to get the next one on better terms. Meanwhile, the supply situation for devs is such that employers have to accept the situation. I'm not sure it's an employer led effect at all; especially given the size of the SME scene in London.