Akshay Saini is an Indian developer and the founder of NamasteDev — one of the largest Indian-origin JavaScript / React tutorial brands, with the Namaste JavaScript series anchoring a generation of working developers' deep-dive into the JavaScript engine internals. His YouTube channel has millions of subscribers and the paid NamasteDev courses extend the same depth into longer-form material.
His CourseFlix listing carries three NamasteDev titles: Namaste React, Namaste Node.js, and Namaste Frontend System Design. The teaching style is unusually rigorous about the engine fundamentals underneath the framework material — Namaste JavaScript in particular goes into V8 internals, scope chain, hoisting, and the call stack at a level most JS courses skip.
Material is paid and aimed at developers ready to deepen their craft on the JavaScript / React stack. For broader content, see CourseFlix's React.js, Node.js, and Frontend System Design category pages.