Hard-level statistics interview questions covering advanced inference, multiple comparisons, non-parametric methods, and complex experimental design. Q1: Explain the multiple comparisons problem and how to address it. Answer: The Problem When testing multiple hypotheses simultaneously, probability of at least one Type …

Hard-level frontend interview questions covering advanced patterns, performance optimization, and complex architectures. Q1: Explain React Fiber architecture and reconciliation. Answer: Fiber Architecture Reconciliation Phases Priority Levels Concurrent Features 1import { useTransition, useDeferredValue } from …

Hard-level Protocol Buffers interview questions covering advanced topics, performance optimization, and complex scenarios. Q1: How does Protocol Buffer encoding work internally? Answer: Varint Encoding: Variable-length encoding for integers Smaller numbers use fewer bytes Most significant bit indicates continuation …

Medium-level Protocol Buffers interview questions covering advanced features, schema evolution, and best practices. Q1: How do you handle schema evolution and backward compatibility? Answer: Backward Compatibility Rules: Never change field numbers: 1// ❌ BAD: Changing field number breaks compatibility 2message User { 3 …

Hard-level Web3 interview questions covering MEV, zero-knowledge proofs, advanced DeFi, and protocol design. Q1: Explain MEV (Maximal Extractable Value) and mitigation strategies. Answer: Sandwich Attack MEV Mitigation 1// ✅ Use private mempools (Flashbots) 2// ✅ Implement slippage protection 3contract MEVProtected { 4 …

Python metaclasses with visual explanations using Mermaid diagrams. What are Metaclasses? Metaclasses are classes that create classes. In Python, everything is an object, including classes: $$ \text{type}(\text{instance}) = \text{class} $$ $$ \text{type}(\text{class}) = \text{metaclass} $$ Class Creation Flow Basic …