He specializes in representing clients before the Tax Court, handling cases related to corporate income tax and value-added tax (VAT), and has been practicing since 2019. He has a wealth of litigation experience, having taken part in trials in numerous Indonesian courts for more than ten years. Chessa has experience providing litigation legal services, including:
- In 2026, Mr. Chessa Ario Jani Purnomo represented a corporate entity in a lawsuit against the Director General of Taxes at the Jakarta Administrative Court.
- In 2025, Mr. Chessa Ario Jani Purnomo provided representation to a foreign private company in a tax appeal concerning income tax matters before the Tax Court.
- In 2025, Mr. Chessa Ario Jani Purnomo, acting on behalf of a private entity, presented a petition for judicial review concerning excessive taxation before the Supreme Court of the Republic of Indonesia.
- In 2023, Mr. Chessa Ario Jani Purnomo represented a private company director as a public defender in a criminal tax review petition at the Central Jakarta District Court.
- In 2022, Mr. Chessa Ario Jani Purnomo represented the Director of a private corporation as a public defender in matters pertaining to embezzlement and money laundering.
