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.
Founder at SidekickYC S26
Intro paths
YC
Justin went through Y Combinator (Summer 2026) — any YC alum in your network can reach them through the YC community.
GP
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 ↗
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In turn, Justin can intro founders to Sidekick's investors below.
Sidekick's investors · 1
Experience
- Sidekick (YC S26)Founder and CEOcurrent2025 — presentSan Francisco, CA
- ArmFinance Analyst2025 — 2026San Jose, CA
Education
- Y Combinator2026
- University of PennsylvaniaMaster's degree, Computer Science2026
- UC Santa BarbaraBachelor's degree, Economics2021 — 2025
- Lynbrook High SchoolHigh School Diploma, General Studies2017 — 2021
Skills & more
Python (Programming Language)2Microsoft PowerPointMicrosoft ExcelMicrosoft OutlookFinancial Analysis1InvestmentsFinancial ModelingEconomicsDue Diligence1Business AnalysisAccountingLeadership4
+4 more
TeamworkProblem SolvingPersistenceAnalytical SkillsLanguages English · Korean · Spanish
From Justin's professional profile.
Same school
Also attended Y Combinator1,463
Akshat GoenkaInvestor at Moonfire VenturesJon XuGeneral Partner at Y CombinatorTed ChaiAssociate at Scale Venture PartnersLeo LuInvestor at Foundation CapitalMaroof AhmedFounder at Octopus VenturesYusuf SherwaniCo-Founder and CEO at Pelago; a Londoner living in New York City
+ 1,457 more
Also attended University of Pennsylvania646
Dasha MaggioPartner at Felicis Ventures, writer on venture capital and founder psychologyNancy WangInvestor at Felicis VenturesEghosa OmoiguiFounder and Managing General Partner at EchoVC PartnersAkshat GoenkaInvestor at Moonfire VenturesJames KuklinskiInvestor at Spark CapitalKerry KilleenAssociate General Counsel at Revolution
+ 640 more
Also attended UC Santa Barbara179
Arturo LitvinHead of Global Portfolio Development at Intel CapitalKevin ThauInvestor at Spark CapitalErica DelamareInvestor at DaphniTiffany ChandraVice President, Head of Talent Network at Sapphire VenturesStephanie DuranInvestor at True VenturesLouis BernemanFounding Partner at Osage University Partners
+ 173 more
Shared employers
Also worked at Arm23
Simon SegarsExecutive Advisor at Black Opal VenturesBruce BeckloffCo Founder & CEO at Bloc VenturesMichael DimelowCCO at Bloc VenturesAndy GreenNon Executive Director at Bloc VenturesBianca FurtunaHead of Data Science at Founders FactoryNathan YadlinGeneral Partner at Palsar Ventures
+ 17 more