Software Development Engineer II, S3 API ; AWS

As a Software Development Engineer (L5) on the S3 Read Object API team, you will build and operate the services responsible for reading and retrieving customer data from Amazon S3 — the world’s most widely used object storage service. The systems you own are foundational to S3, and operating them at S3’s scale presents some of the most demanding and rewarding distributed systems challenges in the industry.

You will contribute to key development projects that integrate with S3 APIs processing hundreds of trillions of transactions per month. Working alongside experienced engineers, you will have the opportunity to shape technical direction, influence architectural decisions, and deliver features that directly impact millions of AWS customers worldwide.

• Design, build, and operate highly available, fault-tolerant, and scalable distributed systems for S3’s read path
• Research and design new product concepts and system architectures that advance the performance and reliability of the S3 Read Object API
• Work closely with fellow engineers to ensure code quality, system scalability, and operational excellence across the full software development lifecycle
• Analyze existing system architectures and proactively identify the most appropriate optimization and refactoring strategies
• Collaborate efficiently with cross-functional teams — including product managers, principal engineers, and partner service teams — to deliver high-impact projects on schedule
• Share your expertise in performance engineering, scalability, distributed systems architecture, and engineering best practices through design reviews, documentation, and mentorship
• Participate in operational on-call rotations, drive root-cause analyses, and continuously improve system observability and reliability

AWS values diverse experiences. Even if you do not meet all of the preferred qualifications and skills listed in the job description, we encourage candidates to apply. If your career is just starting, hasn’t followed a traditional path, or includes alternative experiences, don’t let it stop you from applying.

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• 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…