Marwa was the first FIFA official from Kenya and he made his debut at the 2011 FIFA U-17 World Cup. He was named as an assistant referee in the 2012 and 2013 Africa Cup of Nations.
Marwa was named as a reserve official at the 2014 FIFA World Cup and an assistant referee at the 2016 FIFA Club World Cup. He was included as CAF’s assistant referee in the 2017 FIFA Confederations Cup, where he served alongside Bakary Gassama, Jean-Claude Birumushahu, and Malang Diedhiou.
To see all the matches he has officiated click here
Marwa was due to officiate at the 2018 FIFA World Cup in Russia, but a week before the tournament was due to start, the BBC released an investigation conducted by a Ghanaian journalist which implicated Marwa in a bribery scandal. He was filmed receiving $6000 US dollars before a previous game. He subsequently withdrew from the World Cup.