Sajith is a Research Scientist at the National Laboratory of the Rockies of the United States of America. His research involves grid-level decarbonization, increasing resilience of human settlements against extreme climates, advanced building energy modeling and advanced thermal energy storage systems analysis. In addition to that he is a Visiting Scientist at the Colorado School of Mines where he contributes to research on the same topics above. He works for and assist co-manage three Clean Energy Ministerial work streams. (i) Solutions Center (SC), which provides assistance to developing countries to design and implement clean energy policies, and resolve deployment-related challenges, (ii) NICE Future Initiative on Nuclear Energy policy assistance (iii) 21st Century Power Partnership which serves as a platform for public-private collaboration to advance policy for the large-scale deployment of renewable energy in combination with deep energy efficiency and smart grid solutions.

He is a Global Expert on SDG7 to the UNDESA UN-Energy process and a IRENA Youth Council Member. He is also a Climate Negotiator for Sri Lanka on Global Stocktake. IEEE MGA has appointed him as a representative to the Sustainable Climate Matrix Organization (TSCMO) to lead its external outreach subcommittee and IEEE PES has appointed him to lead the young professionals advisory council 2026-27.