- Beko/Arçelik, ŞOK Market, Metro Market, Danone, Kahve Dünyası, logo.com.tr, ToyzzShop, Pronet, MutluAkü/Toyota- Management of 250+ VM- Managed  Kubernetes clusters and Istio- I migrated 2 huge projects monolithic  to microservices- PG2Mongo (Written with golang and maintained. A streaming connector that writes 5K transactions per second PostgreSQL to MongoDB)- PostgreSQL Performance Tuning & Capacity Monitoring && Standby/Failover Administration && Patroni (PostgreSQL High Scalability) and handled query ~6K TPS.- Log centralization && collecting  && indexing && readable dashboards (Fluentd, ELK, Grafana and dozens of prometheus collector)- OS Tuning and Hardening (sysctl <3)- Implemented security best practices in CI/CD pipelines (automated security scans, dependency checks)- Integrated security tools such as Clair for container security, ensuring all images are free from vulnerabilities- Managed secrets and sensitive information using Vault and Kubernetes secrets- Developed and maintained compliance automation scripts to ensure adherence to industry standards and regulations (PCI-DSS)- Overhauled the shell deploy scripts to implement a CI/CD process that reduced the time to deploy from 20 minute to 3 minutes.