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About
Justin So holds a Master's degree in Computer Science from the University of Pennsylvania and previously worked in a finance role at Arm. He is co-founder and CEO of Sidekick.
CEO at SidekickYC S26
Intro paths
Justin went through Y Combinator (Summer 2026) — any YC alum in your network can reach them through the YC community.
Their group partner at YC was Aaron Epstein, General Partner at Y Combinator — the partner who ran Sidekick's batch and knows the company first-hand. YC profile ↗
In turn, Justin can intro founders to Sidekick's investors below.
Sidekick's investors · 6
Co-founders at Sidekick
Frequently asked questions
- Who is Justin So?
- Justin So holds a Master's degree in Computer Science from the University of Pennsylvania and previously worked in a finance role at Arm. He is co-founder and CEO of Sidekick.
- Where does Justin So work?
- Justin So is CEO of Sidekick.
- What companies did Justin So found?
- Justin So founded Sidekick.
Founder mafias
Y Combinator mafia10,594
Also came through, then founded or led a company.
UC Santa Barbara mafia227
Also came through, then founded or led a company.
arm mafia31
Also came through, then founded or led a company.
About this profile. Compiled from public sources — Sidekick's own website and public professional profiles — and summarised by Fundraising Fox; every fact is kept with where it came from. Spotted an error, or would rather not be listed? Email privacy@fundraisingfox.com · How we build profiles · Your rights