On a dramatic day in Hertfordshire Stevenage sacked manager Paul Tisdale, after a run of three points in nine League Two games sent the club hurtling towards relegation, and appointed Evans.
Evans left Gillingham by mutual consent on January 9 and has not worked since. He was manager at Posh for 11 months before he was sacked in January, 2019 to make way for the return of Darren Ferguson.
Evans take over at Stevenage with the club third from bottom League Two. They are three points above next-to-bottom Oldham who have two games in hand.
Evans has nine games in which to save Stevenage from the National League starting at promotion-seeking Mansfield on Saturday (March 19).