Software Development Engineer II, SCOT-Fulfillment Optimization (FO): Outbound Optimization

Have you ever ordered a product on Amazon and wondered how it got to you so fast? Did you ever think about how Amazon decides which warehouse to ship from, or whether your items should come in one box or two? Join us in building the real-time optimization systems that make these decisions — rebalancing millions of shipment assignments every hour across Amazon's US fulfillment network to deliver packages faster, cheaper, and more efficiently. The Outbound Optimization (O2) team, within Fulfillment Optimization (FO), is responsible for developing and operating the systems that improve upon initial fulfillment assignments at a network level. Our flagship system processes all candidate shipments in the country's network hourly, optimizing for plan adherence, delivery speed, capacity utilization, and cost — directly impacting billions of dollars in annual fulfillment spend. We are seeking a talented, driven Software Development Engineer. As an SDE II for O2: - You will design and build distributed optimization pipelines, partner with applied scientists to translate mathematical models into production systems, and own end-to-end delivery of features that have immediate, measurable business impact. - You will work with research scientists, engineers, and peers to design, develop, test and deploy technology that supports our quickly evolving and growing operations. This role is a highly visible and critical position within Amazon with significant customer impact. A successful candidate will have an established background in building distributed systems, strong technical ability, and a motivation to achieve results in a fast-paced environment. Key job responsibilities In this role, you will: - Design and build distributed compute pipelines that process hundreds of millions of shipments per optimization run - Partner with applied scientists to productionize optimization models (Lagrangian decomposition, constraint programming) - Own and operate production services across AWS (Lambda, Fargate, ECS on EC2) - Build new optimization levers — cost dimensions, constraints, and demand models in OPC - Develop data pipelines and validation tooling to measure business impact of optimization decisions - Exercise judgment in making technical tradeoffs between solution quality, latency, and system complexity A day in the life As an SDE II on O2, you might spend your morning whiteboarding with an applied scientist on how to model a new optimization objective, then spend the afternoon turning that math into Kotlin code that will reassign millions of packages across the network. One week you're designing a new cost dimension that penalizes early shipments to unlock consolidation opportunities; the next you're building a combinatorial algorithm that generates fulfillment options faster than a commercial solver. You'll deploy your changes, watch them flow through simulations and see the business impact in dashboards within days. You own problems end-to-end — from the math to the code to production. Your decisions directly move metrics on billions of dollars of shipment flow, and you'll feel that weight and reward daily. If you’re passionate about this role and want to make an impact on a global scale, please apply! Amazon offers a full range of benefits that support you and eligible family members, including domestic partners and their children. Benefits can vary by location, the number of regularly scheduled hours you work, length of employment, and job status such as seasonal or temporary employment. The benefits that generally apply to regular, full-time employees include: - Medical, Dental, and Vision Coverage - Maternity and Parental Leave Options - Paid Time Off (PTO) - 401(k) Plan   If you are not sure that every qualification on the list above describes you exactly, we'd still love to hear from you! At Amazon, we value people with unique backgrounds, experiences, and skillsets. If you’re passionate about this role and want to make