Sr. Software Development Engineer, Kiro Web

The future of software development is agentic. AWS is building Kiro a frontier AI-powered development environment that autonomously tackles development tasks maintains context across interactions and continuously learns from its work. Kiro is already transforming how developers build and maintain software and were just getting started.

Were looking for a Senior Software Development Engineer to be a technical leader on the Kiro Web team. Youll own the full-stack architecture of a system thats genuinely novel: a web application that orchestrates teams of AI agents collaborating on code in real time with dynamic topology control inter-agent communication streaming visual interfaces and tool approval workflows all built on the Agent Client Protocol (ACP).

Youll make the hard architectural decisions: how to scale the process-per-session model as users run dozens of concurrent agents how to design the state synchronization between server-side ACP processes and browser-side React stores how to architect the multi-agent team orchestration layer so that agents can dynamically activate/deactivate teammates and modify communication topologies at runtime and how to build enterprise features (multi-tenant RBAC usage metering) without compromising the localhost-first simplicity that makes Kiro Web fast and ergonomic.

Your influence will define the teams technical trajectory. Youll mentor engineers across the full stack lead design reviews drive cross-team initiatives with the Kiro CLI and Kiro IDE teams and translate ambiguous product requirements into concrete systems. When novel problems emerge and they will because multi-agent orchestration UIs are a new category youll be the one who designs the solution.

This is your chance to lead the engineering that powers the agent that builds the future.

About the team
Kiro Web builds the browser-based experiences and orchestration platform for Kiro. We own: (1) Kiro Web a full-featured local web application for managing AI coding agent sessions with real-time streaming multi-agent team orchestration dynamic topology control tool approval diff views and session resume (2) the public portal (downloads docs changelog pricing on Harmony) and (3) emerging enterprise console experiences. Our stack: React 19 TypeScript Vite Fastify 22 TailwindCSS v4 Zustand WebSockets JSON-RPC 2.0 pnpm monorepo. Were 15 engineers between Seattle and Portland building a genuinely new category of developer tool interface.

- 5 years of non-internship professional software development experience
- 5 years of programming with at least one software programming language experience
- 5 years of leading design or architecture (design patterns reliability and scaling) of new and existing systems experience
- Experience as a mentor tech lead or leading an engineering team

- 5 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

Amazon is an equal opportunity employer and does not discriminate on the basis of protected veteran status disability or other legally protected status.

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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 WA Seattle - 168100.00 - 227400.00 USD annually