Daryl McMahon has left Ebbsfleet United by mutual consent.
McMahon led Fleet to promotion from National League South and then into the National League play-offs last season.
Club chairman and owner Dr Abdulla Al Humaidi said: “Daryl has worked tremendously hard in getting this club into the National League and consolidating us there.
“Naturally, this is a disappointing day for myself and the board in parting ways with someone who has been part of the very fabric of our club for the past three years.
“However, we believe it is the right decision for the club at this point in our development on and off the field. We wish Daryl all the very best in his future career and reiterate our thanks for all he has accomplished in getting the club to its current position.”