Call: JWT structure?; What is a binary tree?; Web security? Technical interview: Promises vs Callbacks Pros and Cons of JWT SSE vs WebSocket In tests, SPY vs MOCK Put vs Patch HTTP methods useCallback vs useMemo localStorage vs sessionStorage vs cookies Explain XSS Explain DNS and how it's used to restrict access to the website Code-reviewing a React application Hiring manager call: What you know about Kaseya?