From 2013 – 2014 Sittichai was a Cadet Engineer & Junior Engineer on M.T TASCO 1 (Tanker vessel), with Tipco Maritime Co., Ltd.,
From 2014 – 2016 he worked for the Marine Department Area 6, Thailand as a fishing boat inspector at the Port in Port out controlling center, Rayong, Thailand.
From 2016 – 2018 he was a Service Engineer with Daikai Engineering Co., Ltd.
From 2018 – 2022 Sittichai was a Surveyor at H&M Marine Service (Thailand) Limited, working for P&I Clubs, local Insurers handling hull and machinery damage claims and losses involving damage to jetties and wharf structures. He joined McLarens (Thailand) Ltd. in May 2022.