Shortly after her education, before leaving London, Tosin worked with Skidmore Owning and Merril's LLP London[1] between June and October 2007 after which she moved to Metropolitan Architecture in Rotterdam from January 2008 to January 2009, where she was part of a team of six that designed the proposed double-decker Forth Mainland Bridge meant to link Ajah and Ikorodu, in Lagos State.[8][9]