Margaret Hassall and Tracy Dunley-Owen were appointed with immediate effect.
Ms Hassall is currently an independent non-Executive director at OneSavings Bank.
Nucleus says she “brings a broad range of experience developed across various industry sectors including manufacturing, utilities, and financial services.”
She spent seven years working for Deloitte as a consultant and led the financial services consulting business for Charteris.
Ms Hassall was also chief operations officer or chief information officer for divisions within some of the world's largest banks, including Bank of America, Merrill Lynch, Barclays and Royal Bank of Scotland and she is also is a non-executive director for Ascension Trust (Scotland).
She will chair Nucleus’ nomination and remuneration committees.
Tracy Dunley-Owen has more than 15 years’ of sector experience, including senior executive roles at Old Mutual, Guardian Financial Services, Swiss Re Life Capital and Celestial Financial Services.
She is also an independent non-executive director at Womens’ Investment Portfolio Holdings and Lifecheq and has served in roles involving strategy and capital management.
She will chair Nucleus’ risk and audit committees.
The firm says the appointments will “further enhance the board of Nucleus on its admission on the alternative investment market.”
Mike Seddon and Stephen Tucker have stepped down from the board with immediate effect.
Angus Samuels, chairman of Nucleus, said: “I’m very pleased to welcome Margaret and Tracy to our board.
“Their extensive financial services and technology experience will be particularly valuable as we continue to develop our market leading platform and work closely with our advisers and clients to realise the many opportunities in this exciting growth market.
“I would also like to thank Mike and Stephen for their contribution towards our considerable success to date."