His expertise encompasses auditing foreign-invested companies, government sectors, and publicly listed companies in Vietnam across diverse industries. These industries include manufacturing, transportation, healthcare, education, information technology, construction, real estate, media, telecommunications, software, and garment production. Additionally, he has overseen numerous financial and tax due diligence assignments for FDI companies and has provided outsourced internal audit support for multinational corporations.

With a high level of interest in energy transition and sustainability, David has pursued and has been awarded with Certified Renewable Energy Project Developer (RENAC, Germany), making him one of the very few accountants in Vietnam who understands the renewable energy industry.