Chilwan has been Group CEO at DIB since 2013. DIB serves more than 11 million customers with a workforce of over 12,000 employees and a network of more than 545 branches. In June 2026, DIB priced a $1 billion Additional Tier 1 Perpetual Non-Call 6-Year Sukuk, attracting an orderbook of over $2.3 billion and a 2.3x oversubscription rate. In Q1 2026, it reported total assets of $114.3 billion. Chilwan is the chairman of DIB Bank Kenya and serves on the boards of Deyaar, TOM Bank, and the International Islamic Financial Market.