Software Development Engineer II, AZA (Gen AI)

Aza is Amazon's primary internal AI assistant, serving 1.5M+ employees globally across HR, IT, pay, benefits, and workplace domains. We're not wrapping an LLM with a chat UI — we're building a full-stack agentic platform: 60+ production sub-agents, multi-turn orchestration, real-time skill routing, MCP-based tool integrations, and enterprise-grade evaluation systems.We're looking for an SDE-II who wants to build AI-native systems from the ground up.What makes this role unique:* You'll build the agent, not just use one. Aza 2.0 is built on Strands SDK with dedicated ECS Fargate compute, custom orchestration, and a plugin architecture spanning 60+ sub-agents. You'll own real components of this system.* Greenfield Gen AI engineering. We're actively shipping: agentic inline workflows, voice-enabled agents, RAG pipelines, progressive skill loading, and a self-service developer platform for 50+ away teams building on Aza.* Complex, high-stakes domain. Aza handles questions about pay, benefits, leave, HR policies — across every jurisdiction Amazon operates in. Correctness matters. This is where AI reasoning meets real-world constraints.* Scale that doesn't exist elsewhere. Millions of conversations monthly. Sub-3-second response latency. Production reliability with Sr. PE-level architectural standards.* Visibility and mentorship. SVP-level visibility, Sr. PE driving architectural vision, and a fast-shipping team where engineers own end-to-end features in production.Key job responsibilities1. Design and build agentic systems: orchestration, skills, sub-agents, MCP tools, evaluation frameworks2. Ship features end-to-end from design through production deployment3. Work across the stack: LLM integration, distributed systems, real-time APIs, infrastructure-as-code4. Collaborate with Sr. PE, PEs and Sr. engineers on architecture decisions that shape the platform's futureBasic 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- Experience programming with at least one software programming languagePreferred qualification - 3+ years of full software development life cycle, including coding standards, code reviews, source control management, build processes, testing, and operations experience- Bachelor's degree in computer science or equivalentAmazon is an equal opportunity employer and does not discriminate on the basis of protected veteran status, disability, or other legally protected status.Our inclusive culture empowers Amazonians to deliver the best results for our customers. If you have a disability and need a workplace accommodation or adjustment during the application and hiring process, including support for the interview or onboarding process, please visit for more information. If the country/region you’re applying in isn’t listed, please contact your Recruiting Partner.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 .USA, WA, Bellevue - 143,700.00 - 194,400.00 USD annually