The blockchain development toolchain has matured dramatically since 2020. You no longer need to wrestle with raw RPC calls or deploy contracts by hand. Modern frameworks like Foundry and Hardhat provide developer experiences that rival traditional web development — here's the stack you need.
Smart Contract Frameworks
Two frameworks dominate smart contract development: Foundry and Hardhat. Brownie (Python-based) is largely deprecated as of 2024. The choice between Foundry and Hardhat depends primarily on your team's language background and existing tooling preferences — both are production-ready and supported by major protocols.
Foundry has become the default choice for new projects since 2023. Its Rust-based architecture makes it 10–100x faster than Hardhat for compilation and testing, and its native Solidity test framework eliminates the context-switching cost of writing tests in JavaScript. For teams building audit-ready code, the faster test loop significantly reduces iteration time.
Rust / Solidity
Fastest (10–100x Hardhat)
Growing — major protocols migrating
Moderate (CLI-first)
CLI Tools
forge (compile + test)cast (chain interaction)anvil (local testnet)chisel (REPL)Best for: New projects, Solidity-heavy teams, CI/CD pipelines
JavaScript / TypeScript
Slower (Node.js-based)
Largest — most tutorials and plugins
Gentle (familiar JS tooling)
CLI Tools
hardhat compilehardhat test (Mocha/Chai)Hardhat Networkhardhat-deploy pluginBest for: Teams with JS background, existing projects, plugin-heavy workflows
Frontend Libraries
The frontend Web3 library landscape has consolidated rapidly. ethers.js dominated from 2017–2022; viem emerged in 2023 as a TypeScript-first replacement with superior developer experience and tree-shakeable modules. The shift from ethers.js to viem mirrors the broader JavaScript ecosystem's move towards type safety and bundle optimisation.
For React applications, wagmi abstracts wallet management, contract interactions, and chain state into hooks — cutting the boilerplate that made early dApp development painful. WalletConnect provides the multi-wallet connection protocol that powers most wallet integrations, while RainbowKit delivers the polished wallet-connection UI that meets user expectations.
viem
Low-level clientTypeScript-first Ethereum library, successor to ethers.js. Lightweight, modular, tree-shakeable. Preferred for new projects due to superior TypeScript types and bundle size.
ethers.js
Low-level clientThe original JavaScript Ethereum library, still widely used. 10M+ weekly npm downloads. Extensive documentation and community examples make it the safest choice when working with legacy codebases.
wagmi
React hooksReact hooks library for Ethereum. Built on viem. Handles wallet connections, contract reads/writes, transaction state, and account management. Dramatically reduces boilerplate for React dApps.
RainbowKit
Wallet connection UIPre-built wallet connection modal supporting 100+ wallets. Built on wagmi. Implements the Connect Wallet UX pattern with near-zero configuration — handles the UI problem so you focus on protocol logic.
Testing and Deployment
Smart contract testing is not optional — it is the primary defence against exploits that can drain protocol funds irreversibly. Professional teams maintain test coverage above 95% and run both unit tests and integration tests against forked mainnet state before any deployment.
🔬Local Testnets
- Anvil (Foundry) — fastest local EVM node, deterministic state
- Hardhat Network — built-in with console.log support for Solidity
- Fork mainnet for realistic DeFi integrations
🚀Deployment Automation
- Foundry scripts — Solidity deployment scripts with forge script
- Hardhat Ignition — declarative deployment graphs with dependency resolution
- Etherscan verification — verify contract source automatically on deploy
🎯Fuzz Testing
- Forge fuzz testing — property-based testing with automatic counterexample generation
- Echidna — invariant fuzzer for finding edge-case vulnerabilities
- Medusa — next-generation fuzzer for complex stateful protocols
✓Formal Verification
- Certora Prover — formal verification for critical contract properties
- Halmos — symbolic execution for automated invariant checking
- Required by top-tier audit firms and DeFi blue chips
Infrastructure and Services
Production blockchain applications require managed infrastructure services to handle concerns that would otherwise require significant operational overhead. The infrastructure stack for a typical dApp spans four layers — RPC access, data indexing, decentralised storage, and monitoring.
dApp Infrastructure Stack
RPC Providers
Alchemy, Infura, QuickNodeManaged node infrastructure for reading and writing to chains without running your own node. Essential for production dApps.
Indexing
The Graph, GoldskyDecentralised indexing protocols for querying historical blockchain data via GraphQL. Eliminates custom indexing infrastructure.
Storage (IPFS)
Pinata, nft.storageManaged IPFS pinning services for decentralised asset storage. Required for NFT metadata and decentralised frontend hosting.
Monitoring
Tenderly, OpenZeppelin DefenderProtocol monitoring, automated transaction simulation, and smart contract admin actions. Critical for production protocol operations.
Tenderly and OpenZeppelin Defender represent the monitoring and automation layer that separates amateur deployments from production-grade protocols. Tenderly provides transaction simulation (test any transaction before broadcasting), real-time alerts for protocol anomalies, and a full execution trace debugger. Defender automates admin actions — pausing contracts during incidents, managing multisig proposals, and running automated bots — reducing operational risk from human error.
Key Takeaways
- 1Foundry is the modern default for new projects (10–100x faster tests); Hardhat remains dominant for teams with JavaScript backgrounds and existing codebases.
- 2Frontend stack in 2026: viem (low-level) + wagmi (React hooks) + RainbowKit (wallet UI) is the standard combination for new dApps.
- 3Testing is non-negotiable — Foundry fuzz testing and mainnet forking are minimum requirements; formal verification required for DeFi blue chips.
- 4Infrastructure services (Alchemy/Infura for RPC, The Graph for indexing, Tenderly for monitoring) are essential for production; running your own nodes is rarely justified.
- 5Deploy scripts and Etherscan verification should be automated from day one — manual deployments introduce configuration drift that creates audit findings.