Backend Engineer for AI Agent Orchestration

Amazon; Portland (OR); On-site; USD 144,000 - 194,000; Full time

Job summary

Kiro Web builds the web-based experiences and platform services for Kiro. Our server layer is the bridge between browser UIs and kiro-cli's Agent Client Protocol — we spawn and manage AI agent processes, multiplex their real-time output to the browser via WebSocket, and orchestrate multi-agent teams through REST APIs.

We also own the distribution platform that delivers Kiro builds worldwide via CloudFront. The role will own the backend services, support multi-platform distribution, and implement

Qualifications

• 3+ years of non-internship professional software development experience.
• 2+ years of design or architecture experience for large-scale systems.
• 1+ years of software development engineering or related experience.
• 1+ years designing and developing distributed software applications or services.
• 1+ years of object-oriented design experience.
• Bachelor's degree or foreign equivalent in CS, Engineering, Mathematics, or a related field.
• Experience programming with at least one programming language.

Responsibilities

• Build and maintain the Kiro Web server (Fastify/Node.js/TypeScript) — session manager, ACP client adapter, WebSocket gateway, and REST API
• Implement the process-per-session architecture: spawning kiro-cli ACP child processes, managing JSON-RPC 2.0 communication, and lifecycle events
• Build the multi-agent team orchestration layer and inter-agent routing
• Design the WebSocket fan-out system to multiplex notifications to browsers
• Develop Kiro's distribution system across platforms and CDN, with release automation
• Implement tool approval interception and user decision relay
• Write tests, monitoring, and participate in on-call rotations
• Contribute to API design and team technical direction

Skills

Software development

System design

OO design

Programming languages

Distributed systems

Leadership/team collaboration

Education

Bachelor's degree in Computer Science, Engineering, Mathematics, or a related field

Bachelor's degree in computer science or equivalent

Job description

Kiro Web builds the web-based experiences and platform services for Kiro. Our server layer is the bridge between browser UIs and kiro-cli's Agent Client Protocol — we spawn and manage AI agent processes, multiplex their real-time output to the browser via WebSocket, and orchestrate multi-agent teams through REST APIs.

We also own the distribution platform that delivers Kiro builds worldwide via CloudFront. The role will own the backend services, support multi-platform distribution, and implement