Smart Contract Engineer (Solidity) at Ostium

Job Description

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Ostium is building the premier onchain platform for trading real-world assets. By bringing traditional financial markets such as Gold, the S&P 500, and Tesla onchain, Ostium is redefining how global markets are accessed through decentralized finance.

Company: Ostium
Location: Remote (Worldwide)
Level: Mid-Level
Category: Engineering / Web3

Role Overview

Ostium is seeking a Smart Contract Engineer to design, develop, and deploy secure, gas-efficient Solidity smart contracts that power perpetual trading of real-world assets. You will work closely with protocol, backend, and security-focused engineers to build reliable and scalable DeFi infrastructure.

Key Responsibilities

• Design, implement, and audit upgradeable, gas-optimized Solidity smart contracts
• Build core perpetual trading logic, including:
  • Margining systems
  • Funding rate mechanisms
  • Liquidation processes
  • Trade execution flows
• Integrate Chainlink and off-chain oracle systems
• Write, maintain, and execute robust smart contract tests using Foundry
• Collaborate with backend engineers on protocol and infrastructure integrations
• Contribute to security-first development practices and code reviews

Requirements

• Strong proficiency in Solidity with deep understanding of the EVM
• Hands-on experience with Foundry, Hardhat, and DeFi primitives
• Familiarity with:
  • Smart contract upgrade patterns
  • Oracle systems
  • On-chain security best practices
• 2+ years of experience building Web3 or DeFi protocols (preferred)

Why Join Ostium

• Competitive compensation
• Fully remote role with flexible working hours
• Opportunity to work on onchain TradFi derivatives with real-world impact
• Collaborative, security-focused engineering culture