Blockchain & Web3 Smart Contracts
Web3 development bridges cryptography, smart contract security, and distributed ledgers. Learn how to write secure Solidity code, prevent re-entrancy attacks, and deploy decentralized frontends with Ethers.js and Wagmi.
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Core Track Highlights
Structured Phase-by-Phase Syllabus
Focus on build-by-doing milestones rather than passive video consumption.
Phase 1: Cryptography & Solidity Basics
- EVM mechanics, gas optimization, state variables
- Solidity syntax, modifiers, events, and mappings
- ERC-20 token standards and OpenZeppelin libraries
Phase 2: Hardhat Testing & Security Auditing
- Hardhat / Foundry test suites and fuzz testing
- Common smart contract vulnerabilities (Reentrancy, Front-running)
- Static analysis with Slither and Mythril
Phase 3: Full-Stack dApp Frontend & Webhooks
- Connecting wallets with Wagmi and RainbowKit
- The Graph subgraphs for indexing blockchain events
- Deploying on Polygon and Arbitrum L2 testnets
Technical Interview Questions & Answers
Q1: What is a Reentrancy attack in Solidity and how do you prevent it?
A reentrancy attack occurs when an external malicious contract calls back into the calling contract before the initial state balance is updated. It is prevented by using the Checks-Effects-Interactions pattern and OpenZeppelin ReentrancyGuard.
Frequently Asked Questions
Is Web3 development only about cryptocurrency speculation?
No. Web3 engineering is used in supply chain traceability, decentralized identity (DID), tokenized real estate, and verifiable credentials.
Target Job Roles
Solidity Smart Contract Developer
Demand: HighWeb3 Security Auditor
Demand: Very HighRelated Career Tracks
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