Dolphin joins having spent the last two and a half years at Atom Bank, while he has previously enjoyed lengthy spells at Lloyds Bank and Santander.
The challenger lender has recently been on a recruitment drive, bringing in five other new starters to take its total number of employees to 55.
Gary Wilkinson, chief executive officer and co-founder of Redwood Bank, said Dolphin’s wealth of experience would be a valuable asset to the firm, adding: “As we continue to develop and grow, it’s key that we have the very best people on board who are committed to delivering a first-class service for all our business customers.
“He is passionate about customer service, delivery and making a difference in helping SMEs, the lifeblood of the UK economy, achieve their goals and aspirations.”