Backend Engineer for AI Agent Orchestration

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

Benefits offered by this job

Health insurance

Stock options

Paid time off

Parental leave

Job summary

Amazon Development Center U.S., Inc. is seeking a Software Development Engineer to build the server-side systems powering Kiro Web. You will own the backend that spawns kiro-cli processes, manage JSON-RPC messaging, and orchestrate multi-agent teams via REST APIs.

The role involves creating a scalable WebSocket gateway and a robust distribution system for worldwide delivery. This is a systems-level position requiring experience with TypeScript/Node.js, Fastify, and distributed architectures.

Qualifications

• 3+ years of non-internship professional software development experience.
• 2+ years of non-internship design or architecture experience (design patterns, reliability, scaling).
• 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.

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

Non-internship software development

Object Oriented Design

Distributed systems

REST/JSON-RPC

C++, Java, C#

Problem solving

Education

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

Tools

Fastify

Node.js

TypeScript

WebSocket

JSON-RPC 2.0

Job description

Amazon Development Center U.S., Inc. is seeking a Software Development Engineer to build the server-side systems powering Kiro Web. You will own the backend that spawns kiro-cli processes, manage JSON-RPC messaging, and orchestrate multi-agent teams via REST APIs.

The role involves creating a scalable WebSocket gateway and a robust distribution system for worldwide delivery. This is a systems-level position requiring experience with TypeScript/Node.js, Fastify, and distributed architectures.