Duijnstee started his professional career at ING bank, where he was responsible for acquisition & relationship management for the 6 offices of the ING Bank Zaandam District. After ING, he joined Prudential-Bache, the international subsidiary of Prudential Securities, as Senior Vice President heading a team of Financial Advisors. He continued his trajectory towards UHNWI Wealth Management and Institutional Investment Management Services management at Merrill Lynch (later Bank of America ML). Here he nurtured the professional relationship and investment strategies of priority clients across northern Europe. In 2017 he started his career at Cashforce, as Business Development Manager for the Netherlands. As the business and momentum grew for Cashforce, Duijnstee quickly took the lead of the international commercial team as Global Head of Sales & Marketing and is currently responsible for leading the expansion with new clients and strategic partners.