
The response came four days after the interview—unusual for Y Combinator, a Silicon Valley startup accelerator, which typically responds to its applicants on the same day. By then, Shaivi Rau, CC ’26, and Elena Zhao, SEAS ’26, had already read every Reddit thread they could find on the firm and sent what Rau called a “strongly worded email” to make their case. Then, a reply landed in their inboxes on Dec. 22, 2025: “Are you free at 4 p.m. for a call?”