Software Development Engineer III, SC.os Auth and Vendor Service

Are you passionate about building software systems that operate at massive scale? Do you thrive when tackling ambiguous technical challenges and turning them into elegant, well-architected solutions? As a Software Development Engineer III at Amazon, you will lead the design and delivery of complex software systems that directly impact millions of customers. You will own your team"s architectural direction, drive technical strategy, and mentor engineers while continuing to write exemplary code. This role offers the opportunity to work across the full software lifecycle - from defining product strategy through deployment and operations - solving problems where constraints are real and tradeoffs matter. If you are a collaborative, curious engineer who loves building things that last, we want to hear from you.

Key job responsibilities

• Lead the design, implementation, and delivery of multi-engineer software projects, owning your team"s architectural direction and ensuring systems are well-designed, extensible, performant, and secure.
• Write high-quality, production-ready code that demonstrates best practices in organization, clarity, error handling, and documentation, while evaluating opportunities to integrate generative AI tools to augment productivity.
• Drive technical strategy by balancing short-term delivery needs against long-term maintainability, identifying one-way-door decisions, and advocating for the right solutions across your team and dependent systems.
• Collaborate with cross-functional teams to define requirements, clarify assumptions, and resolve conflicting constraints, ensuring alignment on system design tradeoffs including scalability, performance, and security.
• Mentor and coach engineers on your team and across related teams, contribute to recruiting efforts, and establish strong operational practices including alarms, telemetry, runbooks, and retrospective processes.

A day in the life

You start your morning reviewing operational dashboards and addressing any alerts from overnight. By mid-morning, you are deep in a design review with engineers from a partner team, working through interface contracts and dependency tradeoffs. After lunch, you pair with a teammate on a tricky implementation problem, then shift to writing a technical design document for an upcoming project. You close the day in a mentoring session, helping a colleague think through their career growth and next technical challenge.

About the team

Our team builds software that matters to Amazon"s customers and business at scale. We value technical excellence, thoughtful collaboration, and a commitment to getting the details right. We believe great software comes from inclusive teams where every voice is heard and engineers are empowered to take ownership of meaningful problems. We are focused on building reliable, scalable systems for the long term, and we are looking for engineers who share that vision and want to grow alongside us.