About
Daniel Grittner is co-founder and CTO at Hey Telo. He previously worked as a software engineer at Amazon and Celonis, where he focused on database infrastructure, and has published computer vision research. He holds a BS in Computer Science from Technical University of Munich and completed bioinformatics coursework at ETH Zurich.
Founder at Hey TeloYC W25
Intro paths
YC
Daniel went through Y Combinator (Winter 2025) — any YC alum in your network can reach them through the YC community.
GP
Their group partner at YC was Gustaf Alstromer — the partner who ran Hey Telo's batch and knows the company first-hand. YC profile ↗
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In turn, Daniel can intro founders to Hey Telo's investors below.
Hey Telo's investors · 1
Co-founders at Hey Telo
CG
Christopher GrittnerFounder
Experience
- Hey Telo (YC W25)Co-Foundercurrent2025 — presentMunich, Bavaria, Germany
- Stealth StartupCo-Founder2024San Francisco Bay Area
- AmazonSoftware Development Engineer2022Luxembourg
- TUMResearch Assistant - Computer Vision Group2021 — 2022Munich, Bavaria, Germany
- CelonisSoftware Engineer (Database Development)2020 — 2022Munich, Bavaria, Germany
- ORDASoftware Engineer2019Munich, Bavaria, Germany
- Rödl & Partner (Geschäftsfeld Unternehmens- und IT-Beratung)IT-Consultant2017Nürnberg
Skills & more
Rust (Programming Language)1C++3Java5Python5JavaScript3HTML4CSS2Mac OSX2Git2React.jsNode.jsC
+12 more
SQLReact NativeCircleCIPyTorchCreativityStart-upsSoftware EngineeringWeb DevelopmentInvestitionenEntrepreneurshipSoftware DevelopmentManagementLanguages Deutsch · Englisch · Französisch · Spanisch
From Daniel's professional profile.
Frequently asked questions
- Who is Daniel Grittner?
- Daniel Grittner is co-founder and CTO at Hey Telo. He previously worked as a software engineer at Amazon and Celonis, where he focused on database infrastructure, and has published computer vision research. He holds a BS in Computer Science from Technical University of Munich and completed bioinformatics coursework at ETH Zurich.
- Where does Daniel Grittner work?
- Daniel Grittner is Founder of Hey Telo.
- What companies did Daniel Grittner found?
- Daniel Grittner founded Hey Telo.
- Where did Daniel Grittner go to school?
- Daniel Grittner studied at Y Combinator (W25); Technical University of Munich (Master of Science - MS, Computer Science); ETH Zürich.
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
Y Combinator mafia4,716
Also came through, then founded or led a company.
Ryan SheaEntrepreneurshipFounded StacksTarek MansourFounded KalshiSuhail DoshiEating beans & riceFounded Playground +1Subomi OluwalanaW22Founded ConvoyDarius "Bubs" MonsefS19Founded Sightbox +3Matthew ScholzFounded Oisin Biotechnologies +3
+ 4,709 more
ETH Zürich mafia103
Also came through, then founded or led a company.
Veronica Gambillara FonckEngineerFounded LimmaTech Biologics +1Thomas DübendorferMastersFounded Spontacts +1Dr. Hanspeter FässlerHonorary Councillor Award (Ehrenrat)Founded Gravis Robotics +1Nikolay KobyshevDoctor of Science (Dr. sc.)Founded Assaia +1Toni RosinolMaster of ScienceFounded Stack AI +1Robin GuldenerBsc.Founded Nango +1
+ 96 more
Celonis mafia6
Also came through, then founded or led a company.
Same school
Also attended Y Combinator2,000
Tarek MansourCo-founder & CEO of KalshiSuhail DoshiFounder of Mixpanel; founder of ParticleSubomi OluwalanaCo-founder & CEO of ConvoyMaroof AhmedFounder at Octopus VenturesJustin SwartPartner at Bitkraft Esports VenturesCollin WallaceGeneral Partner at Lobby Capital
+ 1,994 more
Also attended Technical University of Munich282
Daan BoekhoudtInvestment Analyst at Cottonwood Technology FundJulian von EckartsbergManaging Director Europe at Burda Principal InvestmentsHannes Voucko-GlocknerInvestment Analyst at Burda Principal InvestmentsThomas MeierPartner, Head of Resilience in Energy & Resources Investments at Verve VenturesNiklas Born de AndrésInvestment & Product Intern at Kibo VenturesItziar EstevezPartner - Growth at Iris Capital
+ 276 more
Also attended ETH Zürich225
Bastian HasslingerInvestor at Index VenturesSteve VassalloInvestor at Foundation CapitalHelge DaebelPartner, Head of Water at Emerald Technology Ventures AgMaurin DaiInvestment Manager, Physical AI & Robotics at Emerald Technology Ventures AgChristoph FreiPartner, Head of Energy at Emerald Technology Ventures AgMax HeftiInvestment Director - Energy at Emerald Technology Ventures Ag
+ 219 more
Also attended EF Language Abroad9
Yagiz KARADENIZManaging Partner at DOMiNO VenturesAndrés EsquivesIntern at Salkantay VenturesMario PadillaInvestor at ActyusLarissa SequeiraInvestor at Spring ActivatorYannick SchelbertHead Risk, Legal & Compliance at GWM AGLukas ThielePlatform Team at First Momentum
+ 3 more
Shared employers
Also worked at Hey Telo (YC W25)1
Also worked at Stealth Startup351
Andrew ChenGeneral Partner at Andreessen HorowitzGabriel PereyraCo-founder & President of HarveyErica VanInvestment Director at Intel CapitalHemamAdvisor at Clear VenturesHamish GarnettAssociate at Manta Ray VenturesFranz KoflerInvestor at Next Frontier Capital
+ 345 more
Also worked at Amazon645
Apoorva MehtaFounder of Instacart; founder of Cloud Health SystemsBinny BansalCo-founder of Flipkart; co-founder of PhonePe and OppDoorBrad PorterFounder & CEO of Collaborative RoboticsJane MooneyCo-founder & VP, Strategy and Finance at Collaborative RoboticsNick FrosstCo-founder of CohereDave MunichielloInvestor at GV (Google Ventures)
+ 639 more
