They also inked forward Graham Slaggert, who spent last season with the Toronto Marlies, to a one-year AHL deal.
Jobst, 29, set career highs across the board last year, scoring 14 goals and 38 points in 61 regular-season games. He enjoyed the best stretch of his pro career during the Calder Cup Playoffs, recording a team-high 10 assists and 13 points, which tied for the Amerks’ lead, in 14 contests.
Meanwhile, Houser, 30, registered a 9-8-2 record with a 2.80 goals-against average and a .906 save percentage in 21 games last season. He hadn’t stayed in the AHL for a full campaign since 2014-15.
In February, the Buffalo Sabres signed Houser to a two-way contract during the season for the third consecutive year.
He has played six games for the Sabres, compiling a 4-2-0 mark with a 2.00 goals-against average and a .948 save percentage.
Warren, 26, compiled three goals and seven points in 43 regular-season games last season and one goal and five points in eight playoff appearances.
Slaggert, 24, scored six goals and 10 points in 63 games last season, his first full AHL campaign. He played four seasons at Notre Dame.
In other news, the Pittsburgh Penguins on Friday signed former Sabres winger Vinnie Hinostroza to a one-year, $775,000 contract. Hinostroza, 29, spent the last two seasons with Buffalo.