Shellah is a member of the Philippine Institute of Certified Public Accountants. She has over 20 years of audit and consulting experience, 16 years of which with Moore Oman. Shellah has led various statutory audit engagements of leading public and private sector companies in Oman.

As leader of the consulting division, she has led consultancy assignments which include valuations, financial modelling, feasibility studies, due diligence, purchase price allocation, management consultancy, other financial, assurance and consulting engagements.