He is the founder of the law firm Haresh Jagtiani & Associates which is now called Oasis Counsel & Advisory.

During the course of his career, Jagtiani has been Counsel for several large foreign and Indian banks and multinational corporations.

was also an Independent Director on the Board of Bharat Petroleum Corporation Ltd.[1] Jagtiani has represented clients in commercial, criminal, constitutional, civil, maritime and matrimonial disputes, as well as in disputes relating to income tax, power and electricity, intellectual property rights, and customs, excise and other indirect taxes.

Jagtiani's corporate clients have included prominent names such as Unitech, Pantaloon Retail, Indian Overseas Bank, Oriental Bank of Commerce, BNP Paribas, Crompton Greaves, Cable Corporation of India and Lupin.

Haresh Jagtiani has also represented numerous public figures, including Late Shri Madhavrao Scindia, cricketers Sachin Tendulkar and Mohinder Amarnath, jockey Pesi Shroff and film personalities, to name a few.