Owned backend systems across Order, Inventory, EDI, Onboarding, and Waystation workflows supporting supplier operations at scale. Mentored 6 engineers, conducted code reviews, and contributed to architecture and design decisions. Led project as interim Engineering Manager, established milestones & drafted technical roadmaps for 6 months. Reduced supplier onboarding time from 28 days to 7 days (75% reduction). Led end-to-end development of the Subscription Management system across backend and frontend, increasing email action rate to 13%. Developed notification microservice for 20K+ suppliers, reducing manual effort by 70%+. Architected Kafka-based event-driven system across 5+ services, reducing synchronous dependencies and enabling independent scaling. Built 8+ Datadog dashboards across multiple services, improving observability and debugging efficiency. Built change-log and audit workflow to improve traceability of operational and product-level updates. Re-architected focus-areas upload pipeline from ~500 to ~10M rows, enabling large-scale operational processing.