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École Polytechnique alumni who just went stealth

13 École Polytechnique alumni started a company in stealth in the last 15 weeks.

École Polytechnique
Showing 13 of 13 founders

William Brach

Co-Founder
Left
SearchApi
Technical Researcher
Before that
Went stealthOct 2026
Work
  • Technical Researcher at SearchApi2026-2026 · until Oct 2026
  • Co-Founder at sommify2022-2026
  • Energy Management System Developer at ENERGO - AQUA a.s.2022-2022
  • Microsoft Developer at Axians Slovakia2019-2022
  • Java Developer at Gratex International, a.s.2018-2018
Education
  • École PolytechniquePhD
  • Faculty of Informatics and Information Technologies, Slovak University of TechnologyPhD
  • Syddansk UniversitetPhD

Pierre-Louis Cedoz

Co-Founder & CEO
Left
H Company
CTO
Before that
Went stealthOct 2026
Work
  • CTO at H Company2024-2026 · left Sep 2026
  • Senior Research Engineer at Google DeepMind2023-2024
  • Senior Research Engineer at Google2020-2023
  • Advanced ML Researcher at BenevolentAI2018-2020
  • Deep Learning Research Assistant - Prof Gevaert's Lab at Stanford University School of Medicine2016-2018
  • Deep Learning Research Intern at BenevolentAI2017-2017
  • Machine Learning Visiting Student at Polytechnique Montréal2016-2016
Education
  • Stanford UniversityMS
  • Ecole polytechniqueMEng

Elio SAMAHA

Founder
Left
DRW
Quantitative Researcher
Before that
Went stealthOct 2026
Work
  • Quantitative Researcher at DRW2026-2026 · until Oct 2026
  • Quantitative Researcher and Trader at Verition2025-2025
  • Artificial Intelligence Engineer at Aneo2024-2024
  • Founder and Co-President of the GDSC at Google Developer Student Club - Sorbonne Université2022-2024
  • Tutor at Ostaz2019-2024
  • Mathematics Tutor at Sorbonne University2023-2024
  • AI Developer at Cerema2023-2023
Education
  • École PolytechniqueMS
  • ENS Paris-SaclayMaster's
  • Pierre and Marie Curie UniversityBS

Benjamin Derré

Founder
Left
Armature (YC P26)
Founding Engineer
Before that
Went stealthSep 2026
Work
  • Founding Engineer at Armature (YC P26)2026-2026 · until Sep 2026
  • Senior Data Scientist at BCG X2022-2026
  • Data Science Intern at Amazon2021-2021
  • Data Scientist Intern at EagleAI2020-2020
  • Intern at Gendarmerie Nationale2018-2019
Education
  • École Polytechnique
  • HEC ParisMS

Axel Moyal

Co-founder
Left
H Company
Member of technical staff
Before that
Went stealthSep 2026
Work
  • Member of technical staff at H Company2025-2026 · until Sep 2026
  • Staff / Lead Applied Scientist at Upstart2021-2025
  • Graduate Research Assistant at Stanford University School of Medicine2019-2021
  • Data Scientist at Meta2020-2020
  • Quantitative Analyst at Eisler Capital2019-2019
  • Data Scientist at Viaccess-Orca2018-2018
  • Cadet Officer at Armée de l’air et de l’espace2016-2017
Education
  • École Polytechnique
  • Stanford UniversityMS
  • Stanford UniversityIgnite

Florentin Koch

Tech Co Founder
Left
FEE Lyon Tech
Etudiant entrepreneur, Collège d'ingénierie Lyon St Etienne (Centrale, INSA, Mines, ENTPE)
Before that
Went stealthSep 2026
Work
  • Etudiant entrepreneur, Collège d'ingénierie Lyon St Etienne (Centrale, INSA, Mines, ENTPE) at FEE Lyon Tech2025-2025 · left Jul 2025
  • AI Engineer at Onepoint2024-2024
  • Employé de rayon en supermarché at Casino, Spar, Vival2020-2020
Education
  • École PolytechniqueMS
  • UC BerkeleyLearn2Launch
  • HEC ParisMS

Antoine Barre

Co-founder
Left
Qube Research & Technologies
Non compete
Before that
Went stealthAug 2026
Work
  • Non compete at Qube Research & Technologies2023-2026 · until Aug 2026
  • Corps des Ponts Fellowship at Ministry of Economy2022-2024
  • Machine Learning Researcher at Ministère des Affaires étrangères français2021-2021
  • Machine Learning Researcher at Alstom2019-2019
  • Research Project (Statistics, Machine Learning) at TotalEnergies2019-2019
Education
  • École Polytechnique
  • ENS Paris-SaclayMaster's
  • École nationale des ponts et chausséesMBA

Laura Roduner

Co-Founder
Left
BMW Group
Autonomous Driving Software Engineer
Before that
Went stealthAug 2026
Work
  • Autonomous Driving Software Engineer at BMW Group2025-2026 · until Aug 2026
  • Professional Athlete at Swiss Equestrian2018-2024
  • Robot Simulation at Disney Research2023-2024
  • Semester Project at AVL Software and Functions GmbH2023-2023
  • Intern at KYBURZ Switzerland AG2022-2022
  • Intern at Felix Eberhard Traktoren und Landmaschinenbetrieb2018-2018
Education
  • École PolytechniqueMaster's
  • ETH ZürichBachelor's
  • Eastbourne College

Oscar HU

Founder
Left
Crédit Agricole CIB
Quantitative Researcher
Before that
Went stealthAug 2026
Work
  • Quantitative Researcher at Crédit Agricole CIB2026-2026 · until Aug 2026
  • Mathematics Tutor at Complétude2025-2026
  • French-Mandarin Chinese Translator at Ministère de l'Intérieur2023-2023
  • Intern at CLIMESPACE2021-2021
  • Intern at Huawei2021-2021
Education
  • École Polytechnique
  • Telecom Paris
  • Stanislas Paris

Jan D.

Co-Founder
Left
Finanzguru
Data Analyst
Before that
Went stealthJul 2026
Work
  • Data Analyst at Finanzguru2024-2025 · left Oct 2025
  • Research Assistant at KIT Institute for Information Systems (WIN)2022-2023
  • Software Engineer at FZI Research Center for Information Technology2022-2022
Education
  • École Polytechnique
  • Karlsruhe Institute of Technology (KIT)MS
  • University of KarlsruheBS

Julien Keller

Founder
LeftNot listed
Before thatNone listed
Went stealthJul 2026
Education
  • École PolytechniqueMaster's
  • UC Berkeley
  • HEC ParisMS

Louis Sylvestre

Founder & CEO
Left
Sirius Space Services
Bras droit du directeur de site - Production
Before that
Went stealthJul 2026
Work
  • Bras droit du directeur de site - Production at Sirius Space Services2026-2026 · until Jul 2026
  • Visiting Student Research Collaborator at Princeton Plasma Physics Laboratory (PPPL)2025-2025
  • Vice président at Duo Conseil X-HEC2024-2025
  • Formation TTVS (Techniques et Technologies des Véhicules Spatiaux) at Centre National d'Études Spatiales2024-2024
  • Ingénieur systèmes électroniques at The Spring Institute for Forests on the Moon2023-2024
  • Consultant junior at Roland Berger2024-2024
  • Interrogateur Oral en Physique at Lycée Sainte-Geneviève2023-2024
Education
  • École Polytechnique
  • Mines Paris
  • EOGN

Frédéric Ollier

Founder and CEO
Left
Unobravo
International Expansion and Growth
Before that
Went stealthJul 2026
Work
  • International Expansion and Growth at Unobravo2023-2024 · left May 2024
  • VP LATAM Pro Marketplace at BlaBlaCar2015-2022
  • Sr Consultant at NeoFocus Strategy & Finance2015-2015
  • Senior Consultant at Cepton2015-2015
  • Investments / New projects - supervisor at Biosev2013-2014
  • Analyst at Louis Dreyfus Company2012-2012
  • Cofounder at Navendis2009-2012
Education
  • Mines ParisMS
  • Ecole polytechniqueMS

Built on Crustdata. Build your own.

Crustdata tracks hundreds of millions of professional profiles. This directory is one saved search: "current title includes founder, current company is Stealth", re-run every week. Point the same search at your own market.

Get an API key 
# the one request behind this page
curl https://api.crustdata.com/watch/person/search \
  -H "authorization: Bearer $CRUSTDATA_KEY" \
  -H "x-api-version: 2025-11-01" \
  -d '{
    "filters": { "op": "and", "conditions": [
      { "field": "experience.employment_details.current.company_name",
        "type": "[.]", "value": "stealth" },
      { "field": "experience.employment_details.current.title",
        "type": "(.)", "value": "founder" }
    ]},
    "fields": ["basic_profile", "experience", "education"],
    "config": { "trigger": { "type": "interval", "every_hours": 168 } }
  }'
# [.] = exact phrase, (.) = all words. Each week it returns only the new matches.

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About this list

What "stealth" means here: the person's current job is a founder title (Founder, Co-Founder, Founder & CEO…) at a company listed as "Stealth", "Stealth Startup" or similar, because they haven't announced it yet.

Where it comes from: public professional profiles, via the Crustdata API. A new search runs every week and adds whoever newly matches. Profiles can take a few weeks to show up, and start dates are by month.

The company on each row is the most recent job before going stealth, with the title they held there. Where we can, we skip internships, advisor seats and freelance stints. On a "former employer" page it shows the job at that employer instead. Click a row for their full work history and education.