Staff Software Engineer (Fullstack, BE-leaning)

Role overview Provide hands-on technical leadership for a marketplace where AI agents can discover, negotiate, and transact advertising inventory. You’ll shape APIs, authentication, and communication protocols for both human and agent clients, while contributing production code and guiding architectural decisions. The role combines backend-heavy full-stack development with prototyping and mentoring in a fast-moving environment.

Responsibilities - Design scalable REST and event-driven APIs for people and AI agents. - Lead development of agent interfaces, MCP servers, and agent-to-agent communication layers. - Build and operate high-throughput services for real-time advertising transactions. - Set direction for authentication, protocol design, API contracts, and transaction flows. - Evaluate emerging agent frameworks and work with product, design, and external platform partners. - Mentor engineers and address edge cases in autonomous agent behavior.

Requirements - At least 8 years building distributed backend systems at scale, including 4 or more years in technical leadership. - Strong API architecture experience, including REST, event-driven design, authentication, and versioning. - Experience with AI agent frameworks and communication protocols, or the ability to assess and learn them quickly. - Proficiency in TypeScript/Node.js, React, and a cloud platform such as GCP or AWS. - Experience designing systems for autonomous or semi-autonomous decisions. - A record of mentoring engineers and working effectively in evolving, fast-paced environments.

Nice to have - Advertising technology experience. - Familiarity with PostgreSQL, BigQuery, Cloud Storage, or Redis.

Benefits and work setup - Remote work, with location-based compensation bands for the US and Canada. The stated salary ranges are $180,000–$230,000 USD or $190,000–$245,000 CAD; individual offers depend on location, experience, and role expectations. - Benefits include medical, dental, and vision coverage; disability coverage; health or flexible spending accounts; and an employer-matched 401(k) or RRSP. - Paid time off, statutory holidays, year-end office closure, and 13 weeks of paid parental leave (eligibility requirements apply). - Home office equipment and setup stipend, access to WeWork spaces, and stock options.