Fundraising Fox

Jules Testard

Founder

Founder at Jam.gg (formerly Piepacker)

Paris, Île-de-France, France

FoundedJam.gg (formerly Piepacker) · YC

About

Jules Testard conducted research at UC San Diego and later worked as a software engineer at AWS, Docker, and Madhive, with a background in distributed systems.

Founder at Jam.gg (formerly Piepacker)YC S20

Intro paths

YC

Jules went through Y Combinator (Summer 2020) — any YC alum in your network can reach them through the YC community.

→

In turn, Jules can intro founders to Jam.gg (formerly Piepacker)'s investors below.

Jam.gg (formerly Piepacker)'s investors · 2

Makers FundSingapore · $500K – $40M checksY CombinatorSan Francisco · $500K checks · since 2020

Co-founders at Jam.gg (formerly Piepacker)

BDBenjamin Devienne
Benjamin DevienneFounder

Experience

  1. GCastFoundercurrent2025 — presentParis, Île-de-France, France
  2. PiepackerCo-Founder and CTO2020 — 2025France
  3. MadHiveSenior Software Engineer2019 — 2020Greater New York City Area
  4. Docker, IncSoftware Engineer2017 — 2019San Francisco Bay Area
  5. Amazon Web ServicesSoftware Engineer2016 — 2017San Francisco Bay Area
  6. UC San DiegoPh.D. (started)2013 — 2016
  7. InformaticaSoftware Engineer Internship2015San Francisco Bay Area
  8. YelpSoftware Engineer Internship2014San Fransisco
  9. InriaResearch Assistant2012École normale supérieure de Cachan
  10. Morgan StanleySummer Technology Analyst2012
  11. École Normale Supérieure de CachanResearch Assistant2011
  12. THEM www.them.pro (Search Engine Optimization and Website Development)web developer2010

Skills & more

Java13Python9C++8Ruby1Database Systems1Objective-CRuby on RailsDatabase TheoryUser Interface Design5Web Design3CSS8Databases1
+2 moreMongoDBPostgreSQL

Languages Chinese · English · French · German

From Jules's professional profile.

Frequently asked questions

Who is Jules Testard?
Jules Testard conducted research at UC San Diego and later worked as a software engineer at AWS, Docker, and Madhive, with a background in distributed systems.
Where does Jules Testard work?
Jules Testard is Founder of Jam.gg (formerly Piepacker).
What companies did Jules Testard found?
Jules Testard founded Jam.gg (formerly Piepacker).
Where did Jules Testard go to school?
Jules Testard studied at UC San Diego (Doctor of Philosophy (Ph.D.), Computer Science); McGill University (B.Sc Honours, Computer Science); Lycee International Francais (Bachelor of Science (B.Sc.), Computer Science).

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

UC San Diego mafia113

Also came through, then founded or led a company.

Elad GilBAFounded Brain Co.Chester NgBSFounded DivXPhillip SamayoaPhDFounded Generation Bio +2Sean AinsworthB.S.Founded RetroSense Therapeutics +1Erik T. EngelsonBAFounded Medina Medical +1Sasha OrloffBSFounded LendUp +1

+ 106 more

McGill University mafia80

Also came through, then founded or led a company.

Noubar AfeyanBSFounded ProFound Therapeutics +12Avak KahvejianPh.D.Founded ProFound Therapeutics +5Jeffrey KarpBENGFounded Tissium +3Serge MesserlianMaster of Science - MScFounded Creyon +1Natalia BakaevaArtsFounded cashew +1Jonathan LimMDFounded Boundless Bio +1

+ 73 more

Docker mafia10

Also came through, then founded or led a company.

Sam AlbaFounding Engineer & VP EngineeringFounded Mendral +1Andrea LuzzardiSoftware EngineerFounded Mendral +1Nathan McCauleyDirector, Docker SecurityFounded AnchoragePablo Chico de GuzmanTech Lead Software EngineerFounded OktetoBen FirshmanDirector of Product ManagementFounded ReplicateCesar TalledoPrincipal EngineerFounded Nestybox

+ 3 more

Informatica mafia6

Also came through, then founded or led a company.

Gaurav DhillonCo-founder & CEOFounded SnapLogicAmy ChangBoard Of DirectorsFounded AccompanyMarge BreyaExecutive Vice President, Chief Marketing Officer & Informatica EducationFounded LeadspaceRavi VermaPerformance Engineer TraineeFounded zingbusGavin SaldanhaCloud Software Development InternFounded Lightscreen AI

Same school

Also attended UC San Diego307

Elad GilSolo general partner investing through Gil CapitalMark SusterManaging Partner at Upfront VenturesChester NgGeneral Partner at AtomicBirgitteInvestor at InvestinorHouman HaghighiPartner, Business & Corporate Development at Menlo VenturesFreya Svedberg-KeatingInvestor at Medicxi

+ 301 more

Also attended McGill University425

Harley FinkelsteinInvestor at Felicis VenturesMattias LjungmanInvestor at Moonfire VenturesNoubar AfeyanInvestor at Flagship PioneeringDavid NaultGeneral Partner at Luge CapitalLaviva MazharPrincipal at Luge CapitalLisa PurcellInvestor at Third Rock Ventures

+ 419 more

Shared employers

Also worked at Docker, Inc27

Peter FentonGeneral Partner at BenchmarkSteve SinghManaging Director at Madrona Venture GroupSimon LeveneCo-founder and Partner at Mosaic VenturesJon ChuInvestor at Khosla VenturesMatt CarbonaraInvestor at Mayfield FundEnrique SalemPartner at Bain Capital Ventures

+ 21 more

Also worked at Amazon Web Services270

Nancy WangInvestor at Felicis VenturesJon TurowVenture Partner at Madrona Venture GroupEric AndersonPartner at Scale Venture PartnersKeerthi NalabotuInvestor at True VenturesKen HowardVice President of Technology Services at Flare Capital PartnersEliya ElonInvestor at Notable Capital

+ 264 more

Also worked at Inria32

Arthur MenschCo-founder & CEO of Mistral AISandeep BhadraGeneral Partner at Vertex VenturesKathy PhamInvestor at Blue Tulip VenturesMichal ValkoInvestor at KAYAJean KrivineInvestor at ATKAProf. Sandeep ShuklaProfessor & Director, IIIT Hyderabad at T-Hub

+ 26 more

Also worked at École Normale Supérieure de Cachan3

Benjamin WainstainPartner at InnovacomMichal ValkoInvestor at KAYAEtienne BernardFounder at NuMind