Databases, Java, Load Balancers, Dockers, Cloud Storage, Linux, Networking, Gcp, C, Golang, Data Structure And Algorithms, AWS, Kubernetes, Python, Azure, C-sharp, REST API design and implementation, Monitoring, Cloud service APIs, Backup Restore software, Scaling, Distributed System Design, Caching, Container based technologies, Object and Block Storage, Filesystem development, Data protection technologies, Unix-like Operating Systems