In Myanmar, she has been leading the Ayeyarwady Futures (2013-2014) and Chindwin Futures (2015-present), the programs that collaborated with state and non-state agencies to support evidence based multi-stakeholder engagement in water resources management and development in the Chindwin River Basin and Ayeyarwady River Basin.

Prior to joining SEI, Chayanis worked as a Programme Officer and Operational Hydrologist at the Mekong River Commission, Vientiane where she focused on managing the hydro-meteorological database, formulating and managing several projects relevant to water resources monitoring and data collection activities and undertaking various hydro-meteorological analyses as required by the MRC programmes.

Chayanis used to work as a water resources engineer in a number of consulting firms (Dhara Consultants, PAL Consultants and ASPAC Consultants) and as a research assistant in Asian Institute of Technology, an international academic institute in Bangkok, Thailand.

Chayanis holds a Ph.D. in Hydrology and Water Resources Engineering from the University of Tokyo and is the winner of two distinguished scholar prizes in Japan.