Software Development Engineer II, Seller Flex

Do you want to transform how sellers fulfill millions of orders worldwide Seller Flex is Amazons program that turns a sellers own warehouse into a fulfillment nodeoffering Prime badging and Amazon-orchestrated operations without moving inventory. As we expand into Japan and scale globally were seeking a Software Development Engineer II to tackle some of the most challenging problems in distributed systems seller enablement and fulfillment orchestration.

Youll work on systems that matter: designing for marketplace plurality so launching in new countries becomes a configuration change rather than a months-long effort making seller state provably correct under partial failures and building self-serve onboarding that scales without white-glove handholding. This role offers deep exposure to world-class operational standards the chance to rearchitect fulfillment systems for global scale and agentic operations and the opportunity to drive measurable business value for sellers across India Europe North America Japan and emerging marketplaces.

Key job responsibilities
- Design and implement scalable software solutions across the full development lifecyclefrom scoping and architecture through deployment and operationsfor Seller Flexs warehouse management seller console mobile app and performance platforms
- Root cause and resolve high-impact seller issues by identifying architectural weaknesses and designing systems that prevent recurrence including implementing distributed-systems patterns to ensure seller state consistency across services
- Drive continuous improvement in availability latency scalability and maintainability of fulfillment systems with emphasis on operational excellence and permanent fixes over short-term workarounds
- Collaborate across Amazons Fulfillment Network teams to deliver marketplace-aware primitives self-serve onboarding capabilities and modernized monetization infrastructure that supports global expansion
- Participate actively in code reviews providing meaningful technical feedback document system architecture and operational procedures and mentor new team members on how Seller Flex software is constructed and operated

A day in the life
Your day involves diagnosing and solving needle-moving seller issues such as why a newly onboarded seller is cancelling orders or why a return package is not picked up in a new geography. Youll spend time identifying architectural issues and designing for the future: turning ad-hoc reconciliation into proper distributed-systems patterns or refactoring fee computation to support Japans launch as a configuration change. Youll review and approve designs and code from teammates establish operational standards that prevent issues before they occur and collaborate with teams across the Amazon Fulfillment Network to ensure your solutions integrate seamlessly with the broader ecosystem.

About the team
Seller Flex turns a sellers own warehouse into a fulfillment node within Amazons network. Sellers store inventory in their facilities list products with Prime badging and Amazon orchestrates pick pack and ship through software embedded directly in the sellers operation. The program operates across India Europe North America Japan and emerging marketplaces with the engineering team owning the warehouse management system seller-facing console mobile app performance and metrics platforms returns processing fees and self-serve onboarding stack.

Our team is launching Seller Flex in Japan this year while advancing five major technical bets: designing for marketplace plurality so new countries launch via configuration rather than custom code; making seller state provably correct under partial failure; closing the loop on seller operations with intelligent automation; scaling self-serve onboarding to eliminate manual playbooks; and modernizing the monetization stack for global consistency. We build systems that empower sellers globally while raising the bar on operational excellence and innovation.

- 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 language
- Bachelors degree or equivalent

- Experience debugging profiling and implementing best software engineering practices in large-scale systems
- Knowledge of system performance memory management and parallel computing principles

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