mark | Cosign

Mark Milastsivy founded Firstbase, which helps entrepreneurs launch and manage U.S. businesses, and served as its CEO through 2025. He now builds Rodeo.

Career

RodeoFounder

Aug 2026 — Present

FirstbaseFounder and CEO

Jun 2019 — Dec 2025

Cosigns Received

Featured Media

hackernoon.com

Building a Business OS — 2023 interview

An interview on Firstbase’s origins, designing for international founders, and expanding incorporation into a broader business platform.

Career

RodeoFounder

FirstbaseFounder and CEO

Cosigns Received

Featured Media

Building a Business OS — 2023 interview

Mark's Collections

Mark's Lists

In these lists

Cosigns Given