About
Co-founder of Den, which develops AI agents that learn from user conversations to handle communications on behalf of their owners via text or phone.
Founder at DenYC X25
Intro paths
Justin went through Y Combinator (Spring 2025) β any YC alum in your network can reach them through the YC community.
Their group partner at YC was Tom Blomfield, Monzo and GoCardless co-founder; Y Combinator partner on leave and Anthropic compute-team member. β the partner who ran Den's batch and knows the company first-hand. YC profile β
In turn, Justin can intro founders to Den's investors below.
Den's investors Β· 2
Co-founders at Den
Experience
- Den (YC X25)Co-Foundercurrent2025 β present
- Lyrebird HealthFounding Engineer2023 β 2025
- AtlassianSoftware Engineer2024 β 2025
- AffindaIntern2023
Frequently asked questions
- Who is Justin Lee?
- Co-founder of Den, which develops AI agents that learn from user conversations to handle communications on behalf of their owners via text or phone.
- Where does Justin Lee work?
- Justin Lee is Founder of Den.
- What companies did Justin Lee found?
- Justin Lee founded Den.
- Where did Justin Lee go to school?
- Justin Lee studied at Y Combinator; University of Melbourne (Bachelor of Science - BS, Computer Science); St Leonard's College.
Founder mafias
Y Combinator mafia8,773
Also came through, then founded or led a company.
+ 8,766 more
Y Combinator mafia4,716
Also came through, then founded or led a company.
+ 4,709 more
University of Melbourne mafia24
Also came through, then founded or led a company.
+ 17 more
Lyrebirdhealth mafia2
Also came through, then founded or led a company.
Same school
Also attended Y Combinator2,000
+ 1,994 more
Also attended University of Melbourne231
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+ 225 more
Also attended St Leonard's College1
Shared employers
Also worked at Den (YC X25)1
Also worked at Lyrebird Health4
Also worked at Atlassian69
+ 63 more