(for a U.S.-based eCommerce technology company modernizing its fulfillment and logistics platforms)About the RoleWe’re seeking a Staff .NET Core Developer (C#) to design, build, and scale the internal systems that power one of the nation’s fastest-growing eCommerce logistics operations. You’ll work on complex, high-impact applications that connect digital tools with real-world fulfillment center technology — optimizing how inventory, orders, and operations flow across the network.This is a hands-on technical leadership role — ideal for an engineer who combines strong architectural instincts with a builder’s mindset. You’ll shape foundational systems, mentor other developers, and collaborate across product, UX, and data teams to deliver stable, scalable, and future-ready software.Responsibilities- Design and develop backend systems and APIs using .NET Core (C#).- Lead architectural discussions around scalability, performance, and maintainability.- Partner with product managers, UX, and data engineers to translate operational requirements into technical solutions.- Contribute to system modernization and codebase evolution, introducing best practices and automation.- Support AI-assisted development initiatives to accelerate delivery and quality.- Mentor mid-level developers and help elevate engineering standards across the team.- Ensure reliability and observability through thoughtful design, testing, and monitoring.Requirements- 8+ years of professional experience developing enterprise applications in C# / .NET Core.- Proven experience designing APIs, microservices, and distributed systems.- Strong understanding of Azure or other cloud environments.- Solid grasp of data modeling, performance optimization, and system integration.- Comfortable navigating complex codebases and improving existing architecture.- Excellent communication skills and the ability to collaborate with cross-functional teams.- Self-starter mindset — curious, proactive, and driven to improve systems and team velocity.Preferred Qualifications- Experience in logistics, fulfillment, or eCommerce platforms.- Experience designing distributed or asynchronous backend systems.- Familiarity with CI/CD pipelines and DevOps practices in Azure.What You’ll Love- Working on mission-critical systems that power real-world logistics at scale.- A culture that values craftsmanship, ownership, and initiative.- Collaborating with time-zone-aligned teams in a highly technical, fast-moving environment.- The chance to make architectural decisions that impact thousands of daily operations.