Weijia Yu
About Weijia Yu
Weijia Yu is a co-founder of Retell AI, a company that builds AI voice agents for phone calls. Retell AI was founded in 2023 and went through Y Combinator's Winter 2024 batch. Its other co-founders are Bing Wu (CEO), Zexia Zhang (CTO), Todd Li (President) and Evie Wang (CMO). Retell's own site and Sacra list Weijia Yu as COO.
Before Retell, he worked at Meta from March 2020 to January 2024, according to his LinkedIn profile. A startup profile site describes the role as a product manager and tech lead hybrid on a Facebook product team. From February 2017 to February 2020 he worked at ObEN, Inc., an AI startup. The same profile site says he led app development there, covering text-to-speech, computer vision and chatbot products.
Retell AI announced a seed round led by Alt Capital, with Y Combinator and Carya Venture also participating. Press coverage puts total funding at about $5.1 million.
Crunchbase describes him as a co-founder of Retell AI and an angel investor. It counts 1 investment, 1 portfolio company, 0 lead investments and 0 exits. It also lists 1 company founded.
The name of the portfolio company, the investment date and the amount are not shown in the public sources reviewed. This page does not name one.
His public work in AI is as an operator. Retell AI is a developer-facing platform for building and running conversational voice agents, including for contact centers. His earlier work at ObEN involved AI products such as text-to-speech and computer vision. No public record of a specific AI angel investment by him was found.
He has not publicly stated a stage, sector or geographic focus for angel investing. No check size has been published. Founders in voice AI or AI infrastructure may find his operating background relevant, but that is an inference from his career and not a stated thesis.
Investing activity
Weijia Yu has made 1 investment according to Crunchbase across 1 portfolio company, and has founded 1 company.
Deals
Frequently asked questions about Weijia Yu
Who is Weijia Yu?
Weijia Yu is a co-founder of Retell AI, a Y Combinator W24 company that builds AI voice agents. Crunchbase also lists him as an angel investor. He previously worked at Meta and ObEN.
Is Weijia Yu an active angel investor?
Crunchbase shows 1 investment and 1 portfolio company, with no lead investments or exits. No further angel activity is public.
What is Weijia Yu's check size?
No check size has been published. Check size is not stated on Crunchbase or in the other sources reviewed.
What stage and sectors does Weijia Yu invest in?
He has not publicly stated a stage or sector focus. His operating experience is in AI voice agents, and earlier in consumer and AI software at Meta and ObEN.
What is Weijia Yu's role at Retell AI?
Retell AI's site and Sacra list him as COO and co-founder. Retell was founded in 2023 and is based in the San Francisco Bay Area.
How can founders contact Weijia Yu?
He has a LinkedIn profile listing him as co-founder of Retell AI. No personal website or X account was found.
Is Weijia Yu an angel investor?
Yes. Weijia Yu invests personally as an angel. Crunchbase counts 1 investment.
How can founders reach Weijia Yu?
Founders on Lounge can see Weijia Yu's contact details in AI Investor Contacts (paid plans), check for a warm introduction through members who worked with them under Warm Paths, and add Weijia Yu to their Investor Pipeline to track the conversation.