backend developer for web3 APIs

0x provides developer APIs for web3 builders, enabling faster trading, better prices, and improved user experiences. Its API Products team turns trading-route optimization into APIs used by wallets, exchanges, trading apps, bridges, and developers worldwide.

• Build new APIs and trading products, from researching problems and designing architectures to shipping initial versions
• Maintain and extend existing APIs, including support for new chains, bridges, and customer-requested features
• Keep APIs fast and reliable as traffic grows, and participate in the on-call rotation
• Investigate failed trades and stuck transfers using logs, traces, and onchain data, and resolve root causes
• Work with product, legal, and GTM teams to turn business and compliance needs into technical decisions
• Write design documents and review teammates’ designs and pull requests

• 6+ Years of backend engineering experience, including at least 2 years in DeFi at a trading app, wallet, DEX aggregator, onchain data company, or similar
• Track record of owning complex projects end to end as a Senior or Lead Engineer
• Experience building and maintaining developer-facing APIs
• Deep onchain knowledge, especially EVM, including transactions, calldata, contract interfaces, gas, and approvals
• Strong system design experience for production-scale backend services
• Use AI to increase engineering impact while applying independent judgment
• Communicate clearly and explain technical tradeoffs to non-engineers
• Align with the values of doing the right thing, shipping consistently, and focusing on long-term impact
• Able to attend annual in-person team offsites around the globe
• Будет плюсом: experience with cross-chain/bridging or DEX aggregation, experience with ecosystems outside EVM such as Solana, TypeScript and/or Rust

• Base salary range: USD $150,000 - $230,000 + equity + ZRX tokens + benefits
• Comprehensive medical, dental, vision, life, and disability insurance for U.S.-based employees; 100% of the base plan is covered for employees and dependents
• 401K and FSA for U.S.-based employees
• Monthly mobile phone bill, wellness, and pre-tax transportation expenses
• Covered mental health benefits, including professional therapy sessions
• Lunch reimbursement for employees worldwide
• Stipend for remote/WFH equipment, including headphones and other work gear
• 12-Week paid parental leave
• Flexible vacation
• Office in the SF Financial District for employees in the region