Backend Engineer, AI Agent Orchestration

Edo; Seattle (WA); On-site; USD 140,000 - 180,000; Full time

Job summary

Amazon in Seattle, WA is seeking a Software Development Engineer to build the server-side systems powering Kiro Web, an AI-powered development environment. You will own the backend that spawns kiro-cli processes, handles JSON-RPC, WebSocket fan-out, and REST APIs for multi-agent coordination.

You'll design a scalable, multi-agent architecture, implement a WebSocket gateway, and contribute to distribution infrastructure that delivers Kiro worldwide.

Qualifications

• 3+ years of professional software development experience.
• 2+ years of design or architecture (design patterns, reliability and scaling) of new and existing systems.
• 1+ years of software development engineer or related occupational experience.
• 1+ years of designing and developing large-scale, multi-tiered, multi-threaded, distributed software applications, tools, systems, and services using: C#, C++, Java, or Perl.
• 1+ years of Object Oriented Design experience.
• Bachelor's degree or foreign equivalent in Computer Science, Engineering, Mathematics, or a related field.
• Experience programming with at least one software 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 over stdin/stdout, and handling lifecycle events (crash recovery, session resume, stale PID handling)
• Build the multi-agent team orchestration layer — team session lifecycle, inter-agent prompt routing with topology validation, parallel dispatch, and skill injection
• Design and implement the WebSocket fan-out system that multiplexes notifications from multiple ACP processes onto browser clients, tagged by session/team/role
• Build and operate Kiro's multi-platform distribution system — metadata services, platform detection, CDN configuration (CloudFront), custom channel authorization, and release automation
• Implement tool approval interception: hold execution when agents request permissions, emit approval requests to the frontend, and relay user decisions back to the agent
• Write comprehensive tests, build monitoring/alerting, and participate in on-call rotations
• Contribute to API design, architecture reviews, and team technical direction

Skills

Software development

System design

Distributed systems

Backend architecture

Object oriented design

Education

Bachelor's degree in CS or related field

Job description

Amazon in Seattle, WA is seeking a Software Development Engineer to build the server-side systems powering Kiro Web, an AI-powered development environment. You will own the backend that spawns kiro-cli processes, handles JSON-RPC, WebSocket fan-out, and REST APIs for multi-agent coordination.

You'll design a scalable, multi-agent architecture, implement a WebSocket gateway, and contribute to distribution infrastructure that delivers Kiro worldwide.