Yudhanjaya Wijeratne is an author, data scientist, and journalist from Sri Lanka. He is also the co-founder and editor-in-chief of Watchdog Sri Lanka, a factchecker, investigative journalism hub, and community tech builder. The organization has led major investigations, such as using satellite imagery analysis to locate mass graves, archiving and analysis of vast troves of government data to explain electricity and infrastructure failures, and building open-source medical donations software subsequently used by the Red Cross and Ministry of Health.

His fiction includes novels like Numbercaste, The Wretched and the Damned, and The Salvage Crew, as well as short stories and occasional game design.

His work has won the Gratiean Prize, been nominated for the Nebula and Independent Games Festival awards, appeared in publications including Wired, Foreign Policy, and Slate, and been Washington Post and Audible bestsellers.