- Reduced webserver latency by 72% through kernel parameter tuning and nginx/httpd configuration. This change also significantly reduced the number of visible application errors and exceptions.- Led the transition to HAProxy and ProxySQL, improving system security, reliability and scalability by allowing for more flexibility in our networking configuration.- Enhanced observability by implementing centralized infrastructure metrics using InfluxDB and Grafana, including contributions to the Telegraf project to improve StatsD and network metrics collection.- Streamlined infrastructure management and deployment using Puppet and Ansible.- Developed and maintained code in multiple languages (Go, Python, Bash, Perl, Ruby, PHP) to automate tasks and improve efficiency.- Collaborated with Cloudflare Enterprise to deploy L7 DDoS protection, enhancing security.- Designed and implemented a Naive Bayes classifier to identify and block phishing emails in real-time.- Actively participated in on-call rotation, troubleshooting and resolving downtime emergencies.- Managed comprehensive deleted email and account recovery processes.