About Ostium
Ostium is a decentralized, self-custodial perpetual swaps protocol built on Arbitrum that enables leveraged trading of real-world assets — including stocks, commodities, indices, forex, and cryptocurrencies — directly from a user's crypto wallet with no broker or custodian. The platform offers up to 200× leverage, transparent on-chain pricing via oracle systems, and a USDC-based liquidity pool, targeting both crypto-native traders and macro investors seeking non-custodial access to global markets.
Company details
Funding
Total raised
$28M
Last stage
Series A
Investors
Founders
Marco Antonio Ribeiro
Harvard graduate and former International Olympiad competitor in physics, biology, and chemistry; co-founded Ostium in 2022 with Kaledora Kiernan-Linn.
LinkedIn
Kaledora Kiernan-Linn
Harvard graduate who cofounded Ostium in 2022. Plans to expand into offshore broker markets targeting non-U.S. investors.
LinkedInRibeiro
Harvard graduate and cofounder of Ostium, founded in 2022, focusing on trading tangible assets like metals and energy.
What happens next.
No applications, no recruiter spam. Just the intro.
Confirm the fit
A few questions to make sure this role is the right shape for you. Two minutes.
I pitch you to the company
I write the intro, send it to the founder, and handle the back-and-forth.
A meeting lands on your calendar
If they’re a yes, I book the chat. You show up — that’s the whole job-hunt.