Staff Software Engineer (Fullstack, BE-leaning)

Scope3 operates the Interchange for agent-to-agent advertising, enabling brands and their agents to transact across various advertising surfaces. They are seeking a Staff Software Engineer to lead the development of APIs and agent interfaces for their AI-driven advertising platform, focusing on architectural decisions and mentoring team members.

Responsibilities:

• Design and architect scalable APIs for both human and AI agent clients
• Lead development of agent interfaces, MCP servers, and A2A communication layers
• Build and operate high-throughput systems for real-time advertising transactions
• Evaluate and integrate emerging agent frameworks and protocols
• Partner with product and design to define clear, agent-friendly API contracts
• Drive architectural decisions around authentication, protocols, and transaction flows
• Collaborate with external DSPs, SSPs, and agent platform partners
• Mentor engineers on API design, distributed systems, and agent architectures
• Anticipate and address edge cases in autonomous agent behavior

Requirements:

• 8+ years building distributed backend systems at scale
• 4+ years in a technical leadership role
• 4+ years working professionally within the AdTech ecosystem
• Strong expertise in API design and architecture (REST, event-driven systems, auth, versioning)
• Experience with AI agent frameworks and communication protocols, or the ability to rapidly learn and evaluate them
• Proficiency with TypeScript/Node.js, React, and cloud platforms (GCP or AWS)
• Experience designing systems for autonomous or semi-autonomous decision-making
• Track record of mentoring engineers and fostering a collaborative team culture
• Comfort working in fast-moving, evolving environments