Amazon

Software Development Engineer, Kiro Web

Amazon • $143K — $194K *
Seattle, WA 98115In-Person
Enterprise Technology
Less than 5 years of experience
Today
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Job Overview by Ladders

Qualifications

  • 3+ years of professional software development experience
  • 2+ years in design or architecture of systems
  • 1+ years as a software development engineer or similar role
  • 1+ years developing multi-tiered, distributed applications
  • 1+ years of Object Oriented Design experience
  • Bachelor's degree in Computer Science, Engineering, or related field
  • Proficiency in at least one programming language

Responsibilities

  • Build and maintain the Kiro Web server using Fastify/Node.js/TypeScript
  • Implement the process-per-session architecture for managing AI sessions
  • Develop a multi-agent team orchestration layer to facilitate inter-agent communication
  • Design and create a WebSocket fan-out system for real-time notifications
  • Manage Kiro’s multi-platform distribution system for global access
  • Implement tool approval processes to handle execution permissions
  • Write tests and build monitoring/alerting systems to ensure reliability

Benefits

  • Comprehensive health insurance (medical, dental, vision)
  • 401(k) matching
  • Paid time off and parental leave
  • Flexible Spending Accounts
  • Adoption and Surrogacy Reimbursement coverage
  • Mental Health Support and EAP services
Full Job Description
Were looking for a Software Development Engineer to build the server-side systems that power Kiro Web - a local web application that manages multiple AI agent sessions through the Agent Client Protocol (ACP). Youll own the backend that spawns, orchestrates, and communicates with kiro-cli processes, handling JSON-RPC 2.0 messaging over stdin/stdout, WebSocket fan-out to connected browsers, and the REST APIs that enable multi-agent team coordination.

The challenges are systems-level and novel: managing a pool of AI agent child processes with independent lifecycles, building a WebSocket gateway that multiplexes real-time notifications from dozens of concurrent sessions, implementing tool approval interception and relay, and designing the inter-agent communication layer that lets orchestrator agents delegate work to specialized agents via REST. Youll also build the distribution infrastructure that delivers Kiro to millions of developers - multi-platform builds, CDN-backed metadata services, and update delivery mechanisms.

Your impact spans both the local development experience and global distribution. Every developer managing AI sessions through the Kiro Web UI depends on your server layer. Every developer downloading Kiro for the first time uses your distribution systems.

This is your chance to build the engine behind the agent that builds the future.

Key job 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 Kiros 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

About the team

Kiro Web builds the web-based experiences and platform services for Kiro. Our server layer is the bridge between browser UIs and kiro-clis 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. Tech stack: TypeScript, Node.js 22, Fastify, WebSockets, JSON-RPC 2.0, pnpm monorepo. The team is between Seattle and Portland, shipping weekly.

BASIC QUALIFICATIONS

- 3+ years of non-internship professional software development experience

- 2+ years of non-internship design or architecture (design patterns, reliability and scaling) of new and existing systems experience

- 1+ years of software development engineer or related occupational experience

- 1+ years of designing and developing large-scale, multi-tiered, multi-threaded, embedded or distributed software applications, tools, systems, and services using: C#, C++, Java, or Perl experience

- 1+ years of Object Oriented Design experience

- Bachelors degree or foreign equivalent in Computer Science, Engineering, Mathematics, or a related field

- Experience programming with at least one software programming language

PREFERRED QUALIFICATIONS

- 3+ years of full software development life cycle, including coding standards, code reviews, source control management, build processes, testing, and operations experience

- Bachelors degree in computer science or equivalent

The base salary range for this position is listed below. Your Amazon package will include sign-on payments and restricted stock units (RSUs). Final compensation will be determined based on factors including experience, qualifications, and location. Amazon also offers comprehensive benefits including health insurance (medical, dental, vision, prescription, Basic Life & AD&D insurance and option for Supplemental life plans, EAP, Mental Health Support, Medical Advice Line, Flexible Spending Accounts, Adoption and Surrogacy Reimbursement coverage), 401(k) matching, paid time off, and parental leave. Learn more about our benefits at https://amazon.jobs/en/benefits.

USA, WA, Seattle - 143,700.00 - 194,400.00 USD annually

About Amazon

Audible is a provider of spoken audio information and entertainment , on the Internet. They provide premium spoken audio content, such as audio versions of books and newspapers and radio programs, that is delivered over the Internet and played back on personal computers and hand-held electronic devices. The Audible service allows consumers to purchase and download their content from their Website, store it in digital files and play it back on personal computers and electronic devices. More than 15,000 hours of audio content are available on their Web site, including audio versions of books, periodicals and radio programs. Several manufacturers have agreed to support and promote the playback of their content on their hand-held audio-enabled electronic devices.

Amazon Careers

Joining Amazon presents an unparalleled opportunity to become part of a vibrant team pushing the boundaries of innovation and growth in the global marketplace. As a leader in e-commerce, technology, and logistics, Amazon offers a variety of job opportunities that cater to a range of skills and professional interests. Work You’ll Do At Amazon, every day is an opportunity to collaborate with the brightest minds in technology and business to redefine what’s possible. Whether you’re interested in software development, marketing, human resources, or customer service, Amazon has a position waiting for you. Transform the way the world shops and innovates with our diverse and inclusive team. Amazon is not just a company; it’s a community where you can drive real change and contribute to projects impacting millions globally. Lead with Innovation and Leadership Amazon is the perfect place to enhance your leadership and innovation skills. Our culture encourages pushing the envelope and imagining the unimaginable. Here, you will lead projects that challenge the status quo and define new industry standards. Work with a team that values diversity and is committed to creating an inclusive environment. Our leadership is focused on harnessing the collective power of unique perspectives to foster growth and innovation. Explore Amazon’s Employment Benefits Amazon’s commitment to its employees extends beyond just career growth. We offer competitive benefits, including health care, parental leave, and diversity training, ensuring that our team not only excels professionally but also enjoys well-being and security. Internship and Networking Opportunities Start your career with an Amazon internship and gain hands-on experience that matters. Our internships provide a gateway to full-time employment and an opportunity to network with professionals across various sectors of the company. Future-Proof Your Career With Amazon, your career path is filled with numerous opportunities for advancement. Our learning and development programs are designed to nurture your professional growth and keep you at the forefront of industry trends. Stay Connected Join Our Team Discover the job opportunities at Amazon that match your skills and interests. We are constantly on the lookout for passionate, curious, and innovative team players ready to make a difference. Keep Up to Date Stay ahead with career tips, insider perspectives, and industry-leading insights you can put to use today—all from the people who work here. Job Alert Emails Customize your subscription to receive job alerts, the latest news, and insider tips tailored to your preferences. Explore the exciting and rewarding career opportunities that await at Amazon. Amazon is more than just a company—it’s a platform for building a promising future. Whether you’re starting or looking to advance your career, Amazon offers the resources, support, and network you need to succeed. Join us, and be a part of our continuing mission to be Earth's most customer-centric company.
Learn more about Amazon
Size
1,608 employees
Market Cap
$832.6 billion
Industry
Retail & Consumer Goods
Net Income
$21.3 billion
Founded
1994
5 Year Trend
+28.1%
Revenue
$386 billion
NASDAQ
AMZN
* Ladders Estimates

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