AI Phone - Senior Agent Runtime Engineer

The role

This role focuses on building the execution infrastructure for AI agents. You will implement agent runtime and orchestration components to support multi-step and long-running task execution.

What you will do

• Implement agent runtime and orchestration components.
• Build tool-calling and execution interfaces.
• Support multi-step and long-running task execution.
• Manage task state, execution history and asynchronous workflows.
• Implement error handling, retries and recovery mechanisms.
• Integrate multiple model providers.
• Build observability and tracing for agent execution.
• Optimize latency, reliability and inference costs.
• Work with context and memory components to provide relevant information to agents.

Required qualifications

• Strong backend engineering experience.
• Experience with distributed systems and asynchronous workflows.
• Experience integrating LLMs into production applications.
• Strong API and service architecture knowledge.
• Experience with queues, state management and observability.
• Good understanding of tool calling and structured outputs.

Nice to have

• Production agent framework or custom agent runtime experience.
• Experience with Temporal or similar workflow orchestration systems.
• Experience with model routing and inference optimization.
• Experience with AI evaluation and tracing.

About the company

The company is reimagining the phone to build proactive applications and devices that bring intelligence into daily conversations, coordination and workflows.