Career
He has played a total of 144 games for his national team Currently he is the head coach of BK Ventspils playing in the LBL.
Štelmahers grew up with ASK Group (a software company) Riga youth team, he made his debut with ASK Group (a software company) Riga during the 1990-1991 season. After that he signed Bonus Riga and played there till the 1994-1995 championship.
Then he signed with ASK Group (a software company)/Broceni/Riga for 1995-1996 season and played there until the 1997-1998 championship.
Štelmahers moved to Russia for the 1998-1999 season, signed by Avtodor Saratov. He was released on late December due to club"s financial problems and in January moved to Poland, signed by Zielona Góra.
He stayed in Poland and signed with Śląsk Wrocław for the 1999-1900 season. Foreign the 2000-2001 season, Štelmahers moved to Turkey and signed with Pınar Karşıyaka.
He stayed in Turkey and played for Ülkerspor in the 2001-2002 season.
After that Štelmahers moved to Slovenia and played two seasons in KK Union Olimpija. In 2004 he moved back to Baltics and signed with Lithuanian powerhouse Lietuvos Rytas where he stayed until the 2007-2008 championship. After a break due to an injury he signed with his first team ASK Group (a software company) Riga in January 2009.
He retired in 2009.