Mark Milastsivy
FounderFounder at Firstbase.io
New York, New York, United States
FoundedFirstbase.io · YC
About
Mark Milastsivy is founder and CEO of Firstbase.io, based in New York City.
Founder at Firstbase.ioYC W21
Intro paths
YC
Mark went through Y Combinator (Winter 2021) — any YC alum in your network can reach them through the YC community.
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In turn, Mark can intro founders to Firstbase.io's investors below.
Firstbase.io's investors · 7
Amino CapitalPalo Alto · $100K – $10M checksAndreessen HorowitzMenlo Park · $500K – $50M checksKleiner PerkinsMenlo Park · $500K – $15M checksOyster VenturesSan Francisco · $25K – $200K checksQuest VenturesSingapore · $50K – $10M checksStartersHubİstanbul · $20K – $821K checksY CombinatorSan Francisco · $500K checks · since 2021
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Experience
- RodeoFoundercurrent2026 — presentNew York, New York, United States
- FirstbaseFounder & CEO2019 — 2025New York, New York, United States
Skills & more
Design5Business Strategy9Marketing Strategy5Business Development3Management3Media2
From Mark's professional profile.
Frequently asked questions
- Who is Mark Milastsivy?
- Mark Milastsivy is founder and CEO of Firstbase.io, based in New York City.
- Where does Mark Milastsivy work?
- Mark Milastsivy is Founder of Firstbase.io.
- What companies did Mark Milastsivy found?
- Mark Milastsivy founded Firstbase.io.
- Where did Mark Milastsivy go to school?
- Mark Milastsivy studied at Y Combinator.
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
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