Sirous is a Principal Urban Designer with a background in architecture and 15 years of experience, specializing in master planning for campuses, waterfronts, downtowns, and new communities across North America, the UK, and Asia. His current focus is on major master planning projects in British Columbia, where he collaborates closely with First Nation communities. He is leading the master plan for the Huu-ay-aht First Nations and the ʔəy̓alməxʷ/Iy̓álmexw/Jericho Lands development for the Musqueam, Squamish, and Tsleil-Waututh Nations in Vancouver.

His notable projects include award-winning Campus Master Plan for the University of Ottawa, the Simon Fraser University Campus Plan, and Tewin, a development partnership with the Algonquins of Ontario. Additionally, Sirous has contributed to various urban design projects, such as the Niagara Complete Streets initiative and several Community Design Plans and Master Plans in Toronto and Ottawa. His international portfolio includes projects like the Kam Sheung Road Development in Hong Kong, the Bidadari Master Plan in Singapore, and the Cardiff Waterfront Master Plan.

Sirous is also committed to academia, currently teaching at the University of Toronto and Vancouver Island University.