Medium-level statistics interview questions covering hypothesis testing, regression analysis, and statistical inference. Q1: Explain hypothesis testing: null hypothesis, alternative hypothesis, p-value, and significance level. Answer: Key Concepts Null Hypothesis (H₀): Statement being tested (usually "no …

Medium-level backend interview questions covering microservices, advanced databases, message queues, and performance optimization. Q1: Explain microservices architecture and its trade-offs. Answer: Monolith vs Microservices Advantages Independent deployment: Deploy services separately Technology flexibility: Different …

Medium-level Cardano interview questions covering advanced Plutus development and optimization. Q1: How do you optimize Plutus contract execution costs? Answer: Optimization: Minimize on-chain code Use off-chain code when possible Optimize datum/redeemer size Batch operations Q2: How do you implement complex state …

Medium-level Cosmos chain operation questions covering advanced chain operations, consensus algorithms, and validator management. Q1: How does the Tendermint consensus algorithm ensure safety and liveness? Answer: Safety Properties: Validity: Only valid blocks are committed Agreement: All honest validators commit same …

Medium-level Cosmos SDK interview questions covering advanced module development, SDK internals, and Ignite customization. Q1: How do you implement custom state transitions and state machines in a module? Answer: State Machine Pattern: 1package keeper 2 3import ( 4 sdk "github.com/cosmos/cosmos-sdk/types" 5) 6 …

Medium-level frontend interview questions covering advanced React, Vue, state management, and performance optimization. Q1: Explain React Context API and when to use it. Answer: Prop Drilling Problem Context Solution 1import { createContext, useContext, useState } from 'react'; 2 3// Create context 4const …

Medium-level Polkadot interview questions covering advanced Substrate development and parachain architecture. Q1: How do you implement custom consensus in Substrate? Answer: Custom Consensus: 1use sc_consensus::{BlockImport, BlockImportParams}; 2 3pub struct CustomBlockImport; 4 5impl BlockImport<Block> for …

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 …

Medium-level Solana interview questions covering advanced program development, optimization, and architecture. Q1: How do you implement cross-program invocations (CPIs)? Answer: CPI Basics: 1use solana_program::{ 2 program::invoke, 3 account_info::AccountInfo, 4}; 5 6pub fn call_other_program( 7 program_id: …

Medium-level Web3 interview questions covering DeFi, advanced Solidity, security, and protocol design. Q1: Explain DeFi and common DeFi protocols. Answer: DeFi Stack Automated Market Maker (AMM) Constant Product Formula: $x \times y = k$ Q2: What are Solidity modifiers and function visibility? Answer: Modifiers …

Medium-level AI/ML interview questions covering neural networks, ensemble methods, and advanced concepts. Q1: Explain backpropagation in neural networks. Answer: How It Works: Backpropagation is the algorithm for training neural networks by computing gradients of the loss with respect to weights. Forward Pass: Input …

Medium-level software architecture interview questions covering distributed systems, event-driven architecture, and advanced patterns. Q1: Explain Event-Driven Architecture and its benefits. Answer: Definition: Architecture where components communicate through events (state changes) rather than direct calls. Core …

Medium-level algorithm interview questions with detailed approach explanations and solutions. Problem 1: Longest Substring Without Repeating Characters Problem: Find length of longest substring without repeating characters. Example: 1Input: s = "abcabcbb" 2Output: 3 3Explanation: "abc" is longest …