Fredrik has many years of experience as a consultant and executive officer within the private as well as the public sector. He has varied experience as a lawyer, with a particular focus on tax law advice in company taxation and for owners, as well as with complaints and equity transactions. At the Tax Administration, he worked particularly with the Tax ABC and with VAT related to real estate.

Fredrik has also been an external examiner and teaching supervisor for master's students at the University of Oslo in tax and corporate law for many years.