Daniel Brennan started as a trained accountant in his family's accountancy business and went on to become a freelance business adviser and accountant. His company portfolio included setting up the procedures for the purchasing system, sales processes, payroll procedures and debt collection procedures, support for passing industry audit for entering international markets. He went into public office where he became chairman of the finance committee and also sat on the planning committee. He went on to form his own Limited company in early 2016.