When companies pay "market rates" for their developers, there should be no surprise that there's high turnover. They'll easily get a better deal going somewhere

When companies pay "market rates" for their developers, there should be no surprise that there's high turnover. They'll easily get a better deal going somewhere else simply due to the variance in those market rates. Here's one easy solution: pay the people at your company more so they don't want to leave for an offer that will certainly be less good than what they have with you. Good software engineers are hard to find. You should be paying them their weight in gold.