AI Phone - Senior Agent Runtime Engineer

Location: Seoul, South Korea; hybrid workplace

Company

hirify.global is building proactive AI-native applications and devices that bring intelligence into daily conversations, coordination, and workflows.

What you will do

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

Requirements

• Strong backend engineering experience.
• Experience with distributed systems and asynchronous workflows.
• Experience integrating LLMs into production applications.
• Strong knowledge of API and service architecture.
• 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.

Culture & Benefits

• Hybrid work arrangement in Seoul, South Korea.
• Full-time employment within the ActAI - Realware department.
• Work focused on building execution infrastructure for proactive, intuitive, and low-cost AI agents.