Weihan Yan

Spearheaded backend development for Chewy’s Sponsored Ads platform, delivering low-latency ad-serving and targeting at massive scale (millions of daily customer interactions and billions of high-intent ad impressions annually). Built distributed microservices and APIs that power real-time ad ranking, campaign orchestration, analytics pipelines, and high-throughput attribution services.

Led backend development for Seller Central Fulfillment and Delivery Promise platforms, enabling accurate delivery-date computation and scalable global order processing for 9.6M+ daily orders. Improved delivery accuracy by 12.8%, reduced seller configuration errors by 21%, and increased reliability to 99.96% availability through performance tuning, caching, monitoring, and CI/CD.

Developed RESTful backend services in Node.js and MongoDB to support student application workflows, profile management, and document submission. Deployed AWS infrastructure (EC2, S3) and contributed to CI pipelines to support rapid MVP delivery and live demos.

Engineered embedded C/C++ firmware for a miniature robotics platform, optimizing motion control, sensor processing, and real-time actuation under strict power constraints. Collaborated on electrical and mechanical system integration, including microcontrollers, custom PCBs, and actuator systems for autonomous robotic prototypes.

Completed a Master of Science in Electrical and Electronics Engineering at Northwestern University (2014–2015).

Earned a Bachelor of Science in Electrical and Electronics Engineering at Michigan State University (2010–2014).