About the company
We founded Ostium with a simple mission: Anyone with a digital wallet should be able to trade stocks, commodities, currencies, and crypto in one place, with full transparency. This started in a hacker house, running arbitrage on offshore CFD brokers - until they froze our accounts and withheld our deposits. We learned the hard truth: their terms meant nothing. The Market We're Going After. CFDs are the worldās largest retail derivatives market - over $10T monthly volume across every major asset class - but they're built on black-box execution, custodial discretion, and antiquated tech. Weāre turning that system on its head. Ostium is building a decentralized perpetuals protocol for real-world markets, with onchain transparency replacing blind trust. Spreads, liquidations, and collateral are visible to everyone. No brokers. No freezes. No hidden spreads.
Job Summary
Responsibilities
šDesign, implement, and audit Solidity smart contracts that enable perpetual trading on real-world assets šDevelop upgradeable and gas-optimized contracts for order execution, margining, funding rate settlement, and liquidation Integrate Chainlinkās Functions product and our proprietary oracle system with core protocol logic šCollaborate closely with backend engineers to ensure seamless contract <-> off-chain service integration šBuild Foundry-based unit and integration tests, fuzzing scenarios, and formal assertions šParticipate in contract audits and bounty programs šWrite detailed documentation and participate in technical architecture reviews šStay on top of the latest DeFi protocol designs and security best practices
Requirements
šStrong proficiency in Solidity and deep understanding of EVM internals šExperience with smart contract development tools: Foundry, Hardhat, Slither etc. šExperience writing gas-optimized, upgradeable contracts (UUPS, Diamond Pattern, etc.) šFamiliarity with Chainlink, EIP-712, off-chain oracles, and cross-chain bridging šUnderstanding of DeFi primitives: perpetuals, AMMs, LP vaults, oracles,collateralization
If youāre passionate about blockchain and decentralized technologies, explore more opportunities in web3 and cryptocurrency careers.
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