Jean Sini
InvestorVenture Partner at Partech Ventures
New York, New York
Writes $100K – $12M checks · typically $8M
About
Jean Sini is the founder and managing partner of Irregular Expressions, where he invests in technical founders at pre-seed and seed stages in data, infrastructure, security AI, and developer tools. He has over two decades of experience building and scaling startups as a co-founder while leading engineering teams, and has been advising and investing in founders since 2012. He has focused full-time on investing in infrastructure software since 2018.
Experience
- Irregular ExpressionsFounder + Managing Partnercurrent2018 — presentNew York, New York, United States
- CanvaInvestor + Advisorcurrent2012 — presentSydney, Australia
- People.aiInvestor + Advisorcurrent2016 — presentSan Francisco Bay Area
- Antheia, Inc.Investorcurrent2015 — presentSan Francisco Bay Area
- PartechVenture Partnercurrent2025 — presentNew York, New York, United States
- PartechGeneral Partner2019 — 2025New York, New York, United States
- ProdPerfectInvestorcurrent2018 — presentGreater New York City Area
- KickpayInvestor + Advisor2014 — 2023San Francisco Bay Area
- MindKick Inc.Investor2017 — 2022San Francisco
- First Round CapitalAngel Track2018 — 2019Greater New York City Area
- Grove (acquired by Wealthfront)Investor + Advisor2016 — 2019San Francisco Bay Area
- Treasure Data, Inc.Investor + Advisor2012 — 2018San Francisco Bay Area
- CadreChief Technology Officer2016 — 2018Greater New York City Area
- Leap LifeAdvisor2016 — 2018San Francisco Bay Area
- BoxbeeInvestor2012 — 2018San Francisco Bay Area
- FountainCo-founder + Chief Technology Officer2013 — 2016San Francisco Bay Area
- One Kings LaneChief Product + Technology Officer2012 — 2013San Francisco Bay Area
- FieldwireAdvisor2011 — 2013San Francisco Bay Area
- IntuitDirector, Software Engineering2009 — 2012Mountain View, California
- IntuitVice President, Data Aggregation2009 — 2012Mountain View, California
Education
- Télécom ParisMS, Computer Science1993 — 1996
- Pierre and Marie Curie UniversityDEA, Computer Systems1995 — 1996
Skills & more
Enterprise Software27Web 2.014JavaScript14SaaS12Java6CSS3Scala2Cascading Style Sheets (CSS)2Software as a Service (SaaS)2Venture CapitalStart-ups89Entrepreneurship68
+12 more
FundraisingProduct StrategySoftware EngineeringProduct DevelopmentSoftware Project ManagementProduct ManagementDistributed SystemsScalabilityArchitectureMobile ApplicationsMobile DevicesSoftware DevelopmentLanguages English · French · Spanish
From Jean's professional profile.
Same school
Also attended Télécom Paris33
Cyril CollonGeneral Partner at Partech VenturesAndré François-PoncetPartner at Partech VenturesJulien-David NitlechManaging Partner at Iris CapitalJonathan DenaisInvestment Director at EducapitalHenri MoissinacInvestor at FELIX CAPITALNoémie Bristol CourgeonInvestment Director at Axeleo Capital
+ 27 more
Also attended Pierre and Marie Curie University32
Jeff ClavierFounding Partner at Uncork CapitalDimitri KrempPrincipal at Axeleo CapitalJack GuedjInvestor at Sand Hill AngelsOphélie LaurinInvestment Associate at World FundRémi DrollerManaging Partner at Kurma PartnersHugues BertinPartner at HCS Capital
+ 26 more
Shared employers
Also worked at People.ai9
Jeff RichardsInvestor at GGV CapitalJake SeidGeneral Partner at Ballistic VenturesIhar MahaniokFounder & General Partner at Geek VenturesNakul MandanFounder & Partner at AudaciousRon HirsonVenture Partner at Founders Circle CapitalOleg RogynskyyStrategic Advisor at Dnipro
+ 3 more
Also worked at ProdPerfect1
Also worked at Grove (acquired by Wealthfront)2
Also worked at Intuit61
Nate WangVP of Investments at Plum Alley InvestmentsDavid HahnCISO Operating Partner at Ballistic VenturesGregory BillingtonResearch at Transform Capital ManagementArjun AroraInvestor at Streamlined VenturesAdam CoccariManaging Director at HubSpot VenturesTekedra MawakanaCo-CEO, Waymo at Operator Collective
+ 55 more
Colleagues at Partech Ventures
Adrian Dincsoy
Partner at Partech Ventures
Aïcha Kane
Office Manager at Partech Ventures
Alexandra Eychenne
Compliance & Risk Officer at Partech Ventures
Alexandre Durrive
Chief Technology Officer at Partech Ventures
Alexis Lancien
Senior Associate at Partech Ventures
Alison Imbert
Partner at Partech Ventures
André François-Poncet
Partner at Partech Ventures
Andrew Whiting
Partner at Partech Ventures






















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