Senior Software Engineer, API Products

As a Senior Software Engineer on the API Products team at 0x, you'll lead projects from conception to production, building and maintaining APIs that power trading across wallets, exchanges, and trading apps worldwide. The API Products team has shipped Swap, Gasless, and Cross-Chain APIs that have moved billions in volume, and you'll expand what the team can take on next, working closely with product and major customers in a hands-on IC role.

What you'll do

• Build new APIs and trading products, from researching the problem and designing the architecture to shipping the first version
• 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 the root cause
• Work with product, legal, and GTM teams, turning business and compliance needs into technical decisions
• Write design documents for your work and review teammates' designs and pull requests

What you bring

• 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
• A track record as a Senior or Lead Engineer of owning complex projects end to end
• Experience building and maintaining developer-facing APIs
• Deep onchain knowledge, especially EVM: how transactions work, including calldata, contract interfaces, gas, and approvals
• Strong system design experience for production-scale backend services
• Proficiency using AI tools to multiply your impact as an engineer while maintaining your own judgment
• Clear communication skills, comfortable explaining technical tradeoffs to non-engineers
• Alignment with 0x core values: do the right thing, consistently ship, and focus on long-term impact
• Ability to attend annual in-person team offsites around the globe

Nice to have

• Experience with cross-chain protocols, bridging, or DEX aggregation
• Experience with non-EVM ecosystems such as Solana
• Experience with TypeScript and/or Rust, our main languages

What we offer

• Base salary range of USD $150,000-$230,000 plus equity plus ZRX tokens plus benefits. Individual pay is determined by job-related skills, experience, location, business needs, and candidate preferences between compensation elements
• Comprehensive insurance (medical, dental, vision, life, disability) for U.S.-based employees with 100% of base plan covered for you and dependents
• 401k and FSA for U.S.-based employees
• Monthly mobile phone bill, wellness, and pre-tax transportation reimbursement
• Covered mental health benefits including professional therapy sessions
• A supportive remote environment
• Lunch reimbursement for all employees globally
• Stipend for your ideal remote or work-from-home setup: headphones and any other work gear you may need
• 12-week paid parental leave
• Access to a well-located office in the SF Financial District for those in the region
• Flexible vacation: take time when you need it

About 0x

0x is a web3 platform on a mission to "Create a Tokenized World Where All Forms of Value Can Flow Freely". Founded in 2017, 0x has processed over 211M transactions and $180B+ in trading volume through its suite of developer APIs used by Matcha, Coinbase Wallet, Robinhood Wallet, Phantom, Rainbow, MetaMask, and many more. Backed by Greylock Partners, Pantera Capital, and Jump Crypto, 0x is a veteran team of crypto builders focused on code quality, team cohesion, and a culture of learning. Remote roles are preferred for EU timezones.