Fundraising Fox

Constantin Schreiber

Founder

Founder at Fastgen · Founder at Blair

Berlin, Berlin, Germany

FoundedBlair · YCFastgen · YC

About

Constantin Schreiber left college to co-found Blair, a Y Combinator-backed income-based financing platform for U.S. students that raised over $100M. He previously worked on autonomous drone projects and has experience with engineering and software systems.

Founder at FastgenYC W23

Intro paths

YC

Constantin went through Y Combinator (Winter 2023) — 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 Fastgen's batch and knows the company first-hand. YC profile ↗

→

In turn, Constantin can intro founders to Fastgen's investors below.

Fastgen's investors · 4

468 CapitalBerlinRainfall VenturesSan Francisco · $100K – $1M checksRebel FundSan Francisco · $100K – $5M checksY CombinatorSan Francisco · $500K checks · since 2023

Co-founders at Fastgen

MMMike Mahlkow
Mike MahlkowFounder
DNDavid Nordhausen
David NordhausenFounder

Founder at BlairYC S19

Intro paths

YC

Constantin went through Y Combinator (Summer 2019) — any YC alum in your network can reach them through the YC community.

→

In turn, Constantin can intro founders to Blair's investors below.

Blair's investors · 8

BONDSan Francisco · since 2026General CatalystSan Francisco · $30M checks · since 2026Index VenturesSan Francisco · $540K – $10.8M checks · since 2026Lightspeed Venture PartnersMenlo Park · $1.7M – $87M checks · since 2026Rainfall VenturesSan Francisco · $100K – $1M checksStepstone GroupCharlotte · since 2026Vibe CapitalSan Francisco · $250K – $500K checksY CombinatorSan Francisco · $500K checks · since 2019

Co-founders at Blair

MMMike Mahlkow
Mike MahlkowFounder
DNDavid Nordhausen
David NordhausenFounder

Experience

  1. Fastgen (YC W23)Co-Foundercurrent2023 — presentNew York, New York, United States
  2. Blair (YC S19)Co-Founder2019 — 2023San Francisco, United States
  3. unicon - hosted at CODECo-Founder2017 — 2019Berlin, Germany
  4. Carl Mollenkopf GmbHInterim CIO2017 — 2018Neckarsulm, Germany
  5. foodspringBusiness Intelligence Intern2016Berlin, Germany
  6. EBSpreneurship ForumChairman2014 — 2015Oestrich-Winkel, Germany
  7. West Design Products LimitedPerformance Marketing Intern2013Folkestone, United Kingdom

Skills & more

Leadership9Management5Entrepreneurship23Strategic Partnerships14Online Marketing15Business Development11Social Networking16Web Design13Web Development10Analytics8SEO6Social Media Marketing4
+2 moreOnline AdvertisingWordPress

Languages Chinese · Englisch · German · Latin · Spanisch

From Constantin's professional profile.

Frequently asked questions

Who is Constantin Schreiber?
Constantin Schreiber left college to co-found Blair, a Y Combinator-backed income-based financing platform for U.S. students that raised over $100M. He previously worked on autonomous drone projects and has experience with engineering and software systems.
Where does Constantin Schreiber work?
Constantin Schreiber is Founder of Blair and Founder at Fastgen.
What companies did Constantin Schreiber found?
Constantin Schreiber founded Blair, Fastgen.
Where did Constantin Schreiber go to school?
Constantin Schreiber studied at Y Combinator (W23 Batch); Y Combinator (S19 Batch); CODE University of Applied Sciences (B.A., Software Engineering).

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

Stanford University mafia903

Also came through, then founded or led a company.

Peter ThielJ.D.Founded PayPal +1Reid HoffmanB.S.Founded LinkedIn +2Joe LonsdaleBSFounded Opto +3Mike Maples JrBSFounded Pattern BreakersSteve JurvetsonMSEEFounded Mojo VisionBalaji SrinivasanGraduate StudentFounded Counsyl +1

+ 896 more

CODE University of Applied Sciences mafia11

Also came through, then founded or led a company.

Arne StrickmannBS Software EngineeringFounded Emdash +1Marinho GomesSoftware EngineeringFounded KiwifyAlexander KübelBachelorFounded KomboAike HillbrandsBachelor of Science - BSFounded KomboLennard SchmidtFounded LangdockJonas BeisswengerSoftware EngineeringFounded Langdock

+ 4 more

EBS Universität für Wirtschaft und Recht mafia5

Also came through, then founded or led a company.

David NordhausenBachelor of Science (B.Sc.)Founded Fastgen +1Dr. Tobias ReichmuthDr. rer. polFounded Singularity GroupSeb RothlisbergerUndergraduateFounded VascoSaskia BruystenMBAFounded Carbon Equity

Same school

Also attended Y Combinator2,000

Tarek MansourCo-founder & CEO of KalshiSuhail DoshiFounder of Mixpanel; founder of ParticleSubomi OluwalanaCo-founder & CEO of ConvoyArhaan A.Deeptech Fellow at Clear VenturesMaroof AhmedFounder at Octopus VenturesJustin SwartPartner at Bitkraft Esports Ventures

+ 1,994 more

Also attended CODE University of Applied Sciences16

Henrik BredenbalsCo-Founder & Partner at w3 fundVicktoria KlichCo-Founder at w3 fundJonathan KuhlCo-Founder at w3 fundAndy TothVenture Partner, Berlin at Scale CapitalTom KlingeHead of Product at FINVIA Family Office GmbHChad LarsonSenior Advisor at KawiSafi Ventures

+ 10 more

Also attended EBS Universität für Wirtschaft und Recht109

Gülsah WilkeInvestor at DN CapitalJohn GregerCPO & Portfolio Partner at Burda Principal InvestmentsYi Min LohInvestment Associate at Burda Principal InvestmentsRouven DresselhausInvestor at Cavalry VenturesChristian WenigerVenture Partner at Storm VenturesJulia Novaes RouxGeneral Partner, Head of Investor Relations & Marketing at TCV

+ 103 more

Also attended Stanford University2,000

Peter ThielCo-founder & Partner at Founders FundReid HoffmanCo-founder of LinkedIn; Partner at GreylockDavid SacksCo-founder & General Partner at Craft Ventures; former White House AI & Crypto CzarKeith RaboisManaging Director at Khosla VenturesGarry TanPresident & CEO of Y CombinatorAlfred LinPartner at Sequoia Capital

+ 1,994 more

Shared employers

Also worked at Blair (YC S19)4

Mike MahlkowFounder at BlairDavid NordhausenFounder at BlairTobias KemkesFounder at LangdockLukas VollmerFounder at Uplane

Also worked at unicon - hosted at CODE2

Tobias KemkesFounder at LangdockLukas VollmerFounder at Uplane

Also worked at foodspring3

Viktoria LindnerInvestor at Enzo VenturesTeresa BudettaCo-Founder and CMO at AVEA at MaximonMarc HermannFounder at Everlab

Also worked at EBSpreneurship Forum2

Gülsah WilkeInvestor at DN CapitalDavid NordhausenFounder at Blair