About
Jason Scharff is co-founder of Cobblestone. He previously held engineering roles at Ramp and Robinhood.
Founder at CobblestoneYC W23
Intro paths
YC
Jason went through Y Combinator (Winter 2023) — any YC alum in your network can reach them through the YC community.
GP
Their group partner at YC was Jared Friedman, YC Group Partner — the partner who ran Cobblestone's batch and knows the company first-hand. YC profile ↗
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In turn, Jason can intro founders to Cobblestone's investors below.
Cobblestone's investors · 2
Co-founders at Cobblestone
JM
Jack MastrangeloFounder
Experience
- -.current2025 — present
- CobblestoneCo-Founder, CEO (acquired by 100)2023 — 2025
- RampEngineering2021 — 2022
- RobinhoodEngineering2018 — 2020Menlo Park, California, United States
Skills & more
Languages English · Spanish
From Jason's professional profile.
Frequently asked questions
- Who is Jason Scharff?
- Jason Scharff is co-founder of Cobblestone. He previously held engineering roles at Ramp and Robinhood.
- Where does Jason Scharff work?
- Jason Scharff is Founder of Cobblestone.
- What companies did Jason Scharff found?
- Jason Scharff founded Cobblestone.
- Where did Jason Scharff go to school?
- Jason Scharff studied at Duke University (Bachelor of Science (B.S.), Computer Science); Menlo School.
Founder mafias
Y Combinator mafia8,773
Also came through, then founded or led a company.
Sam AltmanPresidentFounded Tools for Humanity +3Jessica LivingstonCo-founderFounded Y CombinatorAlexis OhanianYC Summer 2005Founded RedditFred EhrsamYC Summer 2012Founded Nudge +1Matt HuangYC Winter 2011Founded HotspotsTrae StephensYC Winter 2022Founded Pursuit +1
+ 8,766 more
Duke University mafia127
Also came through, then founded or led a company.
Fred EhrsamB.S.Founded Nudge +1Zach PerretBSFounded PlaidDavid CummingsBSFounded Undaunted +4Romesh SubramanianM.S.Founded RaNA Therapeutics +2Ian PeikonBSEFounded Cajal Therapeutics +1Carmichael RobertsDoctor of Philosophy (PhD) 1995Founded Lyratherapeutics +1
+ 120 more
Robinhood mafia28
Also came through, then founded or led a company.
Vlad TenevCo-founder & CEOFounded HarmonicBaiju BhattCo-founderFounded Cowboy Space CorporationAyan BandyopadhyaySoftware EngineerFounded Finic +1Jason FanSenior Product ManagerFounded Hypercare +1Sriram Bhargav KarnatiHead of Blockchain EngineeringFounded TheyaIgor GladkoborodovStaff Software EngineerFounded Coub
+ 21 more
Ramp mafia21
Also came through, then founded or led a company.
Ian TraceySenior Staff Software Engineer, Applied AIFounded Hydrant +1Royce ArockiasamyApplied AI EngineerFounded Pleom +1Karim AtiyehCo-Founder, Co-CEO RampFounded Paribus +1Austin HayHead of Marketing TechnologyFounded ClarifyKingsley AdvaniInvestorFounded AllocationsDaniel BessonovInternFounded Avora
+ 14 more
Ramp mafia19
Also came through, then founded or led a company.
Ian TraceySenior Staff Software Engineer, Applied AIFounded Hydrant +1Royce ArockiasamyApplied AI EngineerFounded Pleom +1Daniel BessonovInternFounded AvoraMichael LiuProduct ManagerFounded FinaryJosh WrightStaff Software EngineerFounded ApolloMoritz PailSoftware EngineerFounded Mine
+ 12 more
Same school
Also attended Duke University522
Fred EhrsamCo-founder and Senior Advisor at Paradigm; founder of NudgeJeremy LevinePartner at Bessemer Venture PartnersZach PerretCo-founder & CEO of Plaid; co-founder of MischiefJulie YangVice President at InvestcorpScott RaneyManaging Director at Redpoint VenturesJack Bixby LucasGeneral Partner at Lucas Venture Group
+ 516 more
Also attended Menlo School55
Patrick ChaseManaging Director at Redpoint VenturesJack Bixby LucasGeneral Partner at Lucas Venture GroupDaniel BreyerInvestor and founder in San FranciscoTed BreyerPartner at Breyer CapitalBuzz FannInvestor at IVP (Institutional Venture Partners)Sam ParkerInvestor at IVP (Institutional Venture Partners)
+ 49 more
Shared employers
Also worked at Cobblestone1
Also worked at Ramp53
Logan BartlettManaging Director at Redpoint VenturesAlex TranInvestment Team at General CatalystClay FisherInvestor at Spark CapitalJacob EffronManaging Director at Redpoint VenturesAustin HayInvestor at Khosla VenturesJeannette zu FürstenbergPresident & Managing Director at General Catalyst
+ 47 more
