Over the course of his career, Flett has worked in product management, marketing and service operations, while at BT he helped the organisation achieve "a world number one ranking for customer services".
Flett will sit on the JT board in addition to his current role as CEO of Smart Data Communications Company.
He said: "JT’s reputation among much larger businesses in the UK and overseas is already excellent and that reputation is growing rapidly.
"It is a forward-looking company that is doing remarkable things in the Channel Islands and around the world. That’s why I wanted to join the JT Board, and I’m delighted to be working with such a creative, ambitious and diverse company. What impresses me more though is how well embedded JT is in its community. This was demonstrated this year when it won Silver at the UK Customer Experience Awards, beating BT in its category, I might add.
"Listening to customers and acting on their feedback to develop products and services shows JT is a company that is moving forward and taking its core customers with them," he continued.
Established in 1888, JT employs more than 600 people across seven global locations. Flett will sit on the board alongside chairman Phil Male, group CEO Graeme Millar, CFO Hélène Narcy, and non-exec directors Meriel Lenfestey, Joe Moynihan, Sean Collins and Mark Shuttleworth.
Millar added: "We’re delighted to welcome someone of Angus’s calibre to JT. His expertise and experience will greatly bolster JT’s long-term plans and strategies. It is also hugely beneficial that he comes from a background of customer service and customer relationship management, an area that is very important to us and our people as we continue to provide and receive positive customer experience feedback, which is crucial to the success of our business.”