Fundraising Fox

Jean Sini

Investor

Venture 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.

Contact· published on Jean's own website

Experience

  1. Irregular ExpressionsFounder + Managing Partnercurrent2018 — presentNew York, New York, United States
  2. CanvaInvestor + Advisorcurrent2012 — presentSydney, Australia
  3. People.aiInvestor + Advisorcurrent2016 — presentSan Francisco Bay Area
  4. Antheia, Inc.Investorcurrent2015 — presentSan Francisco Bay Area
  5. PartechVenture Partnercurrent2025 — presentNew York, New York, United States
  6. PartechGeneral Partner2019 — 2025New York, New York, United States
  7. ProdPerfectInvestorcurrent2018 — presentGreater New York City Area
  8. KickpayInvestor + Advisor2014 — 2023San Francisco Bay Area
  9. MindKick Inc.Investor2017 — 2022San Francisco
  10. First Round CapitalAngel Track2018 — 2019Greater New York City Area
  11. Grove (acquired by Wealthfront)Investor + Advisor2016 — 2019San Francisco Bay Area
  12. Treasure Data, Inc.Investor + Advisor2012 — 2018San Francisco Bay Area
  13. CadreChief Technology Officer2016 — 2018Greater New York City Area
  14. Leap LifeAdvisor2016 — 2018San Francisco Bay Area
  15. BoxbeeInvestor2012 — 2018San Francisco Bay Area
  16. FountainCo-founder + Chief Technology Officer2013 — 2016San Francisco Bay Area
  17. One Kings LaneChief Product + Technology Officer2012 — 2013San Francisco Bay Area
  18. FieldwireAdvisor2011 — 2013San Francisco Bay Area
  19. IntuitDirector, Software Engineering2009 — 2012Mountain View, California
  20. IntuitVice President, Data Aggregation2009 — 2012Mountain View, California
  21. Twelvefold MediaChief Technology Officer2008 — 2009San Francisco Bay Area
  22. ActiveweaveCo-founder + Chief Technology Officer2005 — 2008San Francisco Bay Area
  23. Symbol Technologies, Inc.Senior Director, Engineering2004 — 2005San Francisco Bay Area
  24. Oracle CorporationDirector, Software Engineering1996 — 2004San Francisco Bay Area

Skills & more

Enterprise Software27Web 2.014JavaScript14SaaS12Java6CSS3Scala2Cascading Style Sheets (CSS)2Software as a Service (SaaS)2Venture CapitalStart-ups89Entrepreneurship68
+12 moreFundraisingProduct StrategySoftware EngineeringProduct DevelopmentSoftware Project ManagementProduct ManagementDistributed SystemsScalabilityArchitectureMobile ApplicationsMobile DevicesSoftware Development

Languages English · French · Spanish

From Jean's professional profile.

Colleagues 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
Andrew Whiting
Partner at Partech Ventures
Ariadne Lemieux-Cumberlege
Senior Associate at Partech Ventures
Arnaud De Keulenaer
Senior Legal Counsel at Partech Ventures
Arnaud Minvielle
General Partner at Partech Ventures

Frequently asked questions

Who is Jean Sini?
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.
Where does Jean Sini work?
Jean Sini is Venture Partner at Partech Ventures.
What check size does Jean Sini write?
Jean Sini typically writes checks of $100K – $12M.
Where did Jean Sini go to school?
Jean Sini studied at Télécom Paris (MS, Computer Science); Pierre and Marie Curie University (DEA, Computer Systems).

Same school

Also attended Télécom Paris49

Arthur MenschCo-founder & CEO of Mistral AICyril CollonGeneral Partner at Partech VenturesJulien-David NitlechManaging Partner at Iris CapitalJonathan DenaisInvestment Director at EducapitalHenri MoissinacInvestor at FELIX CAPITALNoémie Bristol CourgeonInvestment Director at Axeleo Capital

+ 43 more

Also attended Pierre and Marie Curie University51

Thomas WolfCo-founder & Chief Science Officer of Hugging FaceJeff ClavierFounding Partner at Uncork CapitalDimitri KrempPrincipal at Axeleo CapitalJack GuedjInvestor at Sand Hill AngelsOphélie LaurinInvestment Associate at World FundRémi DrollerManaging Partner at Kurma Partners

+ 45 more

Shared employers

Also worked at People.ai12

Jeff RichardsInvestor at GGV CapitalJake SeidGeneral Partner at Ballistic VenturesIhar MahaniokFounder & General Partner at Geek VenturesNakul MandanFounder of Audacious Ventures, an early stage VC firm partnering with ambitious technology foundersRon HirsonVenture Partner at Founders Circle CapitalOleg RogynskyyStrategic Advisor at Dnipro

+ 6 more

Also worked at ProdPerfect1

James Lu MorrisseyGeneral Partner at Umami Capital

Also worked at Grove (acquired by Wealthfront)1

Hannah NixonOperations Manager at Hack VC

Also worked at Intuit107

Nate WangVP of Investments at Plum Alley InvestmentsDavid HahnCISO Operating Partner at Ballistic VenturesAnkita BalotiaPrincipal at Fireside Ventures Advisory LlpGregory BillingtonResearch at Transform Capital ManagementArjun AroraInvestor at Streamlined VenturesAdam CoccariManaging Director at HubSpot Ventures

+ 101 more