Since 2001, Endjärv has worked in the architectural bureau Agabus, Endjärv & Truverk OÜ as an architect and partner. Since 2009, he has also been active in the Allianss Arhitektid OÜ architectural bureau.
The most notable works by Endjärv are the villa in Otepää in southern Estonia, the new building of the University of Tallinn, the Viimsi School and the library of the Tallinn Technical University.
Endjärv is a member of the Union of Estonian Architects.