Mr. Manlangit served as Editor of the Philippine Law Journal from 2022 to 2023.
He represented the Philippines in the 40th Jean Pictet Competition held in Durrës, Albania, where his team emerged as World Champions and where he was recognized as one of the best oralists. He was also the captain of the team which represented the Philippines in the 2021-2022 Monroe E. Price Media Moot Court Competition in Oxford, United Kingdom (via videoconference), where his team finished Top 5 Overall and received the Best Memorials Award.
Mr. Manlangit was admitted to the Philippine Bar in 2023 and is a member of the Pasay-Parañaque-Las Piñas-Muntinlupa (PPLM) Chapter of the Integrated Bar of the Philippines.