Raised uptime from 99.5% to 99.95% and reduced major incidents by 70% through improved monitoring, on-call playbooks, service health dashboards, and blameless post-mortems. Executed a 14-month migration from data centers to AWS with no customer-facing downtime, finished 2 months early, and reduced annual hosting costs by $3.2M using AWS, Kubernetes, and Terraform; hired 11 engineers, promoted 6 (including 2 into management), and co-wrote the engineering career framework used to level and promote 200+ engineers.

Reduced billing processing errors by 85% by leading a 6-engineer rewrite of the billing system. Built the backend for a patient scheduling system used by 600 clinics and created the company's first developer onboarding program, reducing time to first shipped code from 3 weeks to 3 days.

Increased release frequency from monthly to weekly by automating the release process. Built features for a logistics tracking web application serving 2,000 business customers.