Senior Software Engineer, API Products

About the role

At 0x, the Senior Software Engineer will be instrumental in building and maintaining developer-facing APIs that enhance trading experiences. This role involves designing new APIs, extending existing ones, and ensuring they remain fast and reliable as user traffic increases.

The team values code quality and collaboration, making it essential for the engineer to communicate effectively with both technical and non-technical stakeholders. Success in this role means delivering impactful solutions while adhering to the company's core values.

The salary range for this role is between $150,000 and $230,000, complemented by equity and additional benefits.

Skills that matter here

• backend engineering: This role requires significant experience in backend engineering to develop and maintain robust APIs.
• API development: Candidates will focus on building new APIs and enhancing existing ones to meet user needs.
• EVM: A deep understanding of EVM is crucial for handling transactions and integrating with blockchain technologies.
• TypeScript: TypeScript will be used in the development of APIs to ensure type safety and better code quality.
• Rust: Rust may be utilized for building performance-critical backend components.

Who this role suits

• An experienced engineer with a strong background in DeFi and trading applications.
• Someone who thrives in a remote work environment and values team cohesion.
• A clear communicator who can articulate technical concepts to diverse audiences.
• A proactive individual aligned with long-term impact and ethical practices.

From the employer

• Build new APIs and trading products, from researching the problem and designing the architecture to shipping the first version.
• Maintain and extend our existing APIs, including support for new chains, bridges and customer-requested features.
• Keep our 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, turning business and compliance needs into technical decisions.
• Write design documents for your work and review your 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.
• Senior or Lead Engineer with a track record of owning complex projects end to end.
• Built and maintained 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.
• Clear communicator, comfortable explaining technical tradeoffs to non-engineers.
• Aligned with our core values: do the right thing, consistently ship, and focus on long-term impact.
• Able to attend annual in-person team offsites around the globe.

• The base salary range for this position is USD $150,000 - $230,000 + equity + ZRX tokens + benefits.
• Comprehensive insurance (medical/dental/vision/life/disability) for U.S.-based employees — 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 expense.
• Covered mental health benefits (included professional therapy sessions).
• A supportive remote environment.
• Lunch reimbursement for all employees across the globe!
• Stipend for your ideal remote / WFH set-up: headphones, and any other work gear you may need.
• 12-week paid parental leave.
• Great office conveniently located in the SF Financial District for those in the region!
• Flexible vacation: Take time when you need it (and we really mean it!).