David Cohen is a seasoned system administrator, DevOps engineer, and software developer with experience spanning small businesses, mid-size companies with over a hundred employees, to large tech and engineering firms boasting staffs exceeding ten thousand. He is currently honing his skills as a Site Reliability Engineer (SRE) at a leading tech unicorn. Throughout his diverse career, David has concentrated on Linux, Cloud Infrastructure, DevOps, and programming in languages such as Python, Ruby, JavaScript, and Go, with a special emphasis on web security. He has an impressive track record, which includes contributing to the design of two Tier-4 data centers and serving as an infantryman. David's passion for teaching and technology shines through on his tutorialinux YouTube channel, where he has empowered tens of thousands to master both the fundamental and intricate aspects of system administration and software engineering.