Career
His regular position is winger. Early career and Sevens rugby
Ambaka started his career for Kenya Harlequins in 2010. Harlequins" strength and conditioning coach Geoffrey Kimani recommended Ambaka to the Kenya Sevens head coach, Benjamin Ayimba.
He made his debut for the Kenya Sevens side at the 2011 Hong Kong Sevens tournament.
He represented them during the 2011-2012 and 2012-2013 Institutional Review Board Sevens World Series. He also played at the 2013 Rugby World Cup Sevens in Moscow.
He was also included in the Kenya national team squad that played in the 2014 Africa Cup competition (which doubled up as a 2015 Rugby World Cup qualifying tournament), but had to withdraw after suffering an ankle injury. Lyon
In 2013, Ambaka signed a professional contract with Lyon for the 2013-2014 Rugby Pro D2 season, becoming the first Kenyan rugby player to play for a team in the top two divisions in France.
Western Province
He was signed on the recommendation of Jerome Paarwater, the coach of the Kenya national team and former coach of Western Province.
However, shortly after arriving in Cape Town, he suffered an ankle injury and made no appearances for the team during their title-winning season.