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Application Dev

Web3 Frontend Engineer

Builds responsive web interfaces and integrates them seamlessly with blockchain smart contracts and wallets.

Level: MidMode: High-code#React#TypeScript#Ethers.js#Viem

Next action

Build your Web3 proof-of-work. Start contributing and prepare for interviews based on real scenarios.

Lane Type
Application Dev
Seniority Level
Mid
Execution Mode
High-code

1. Role Overview

The bridge between human users and complex blockchain logic. You build responsive web interfaces (dApps), handle crypto wallet connections, sort transaction statuses, and present on-chain data in real-time.

2. Daily Work

What you will actually do most weeks

Building web interfaces using React.js, Next.js, Tailwind CSS, and TypeScript
Integrating dApps with smart contracts using Web3 libraries like Viem, Wagmi, or Ethers.js
Handling various network states (network switching, pending transactions, wallet disconnections) to keep UX smooth
Optimizing on-chain data loading using RPC services or indexing (The Graph / Subsquid)

Expected Outputs & Deliverables

Fast, responsive, and bug-free dApps across browsers
Stable crypto wallet integrations (MetaMask, WalletConnect, Rabby, Phantom)
Reusable UI Components

3. Skills & Tools

Must-Have Skills

High-level proficiency in JavaScript / TypeScript, React.js, and Next.js
Deep understanding of Web3 integration libraries (Viem, Wagmi, Ethers.js, RainbowKit / Web3Modal)
Asynchronous state management for blockchain RPC calls (React Query / SWR)
Basic understanding of how wallet extensions and cryptographic signing work (EIP-712 signatures)

Ecosystem Tools

Next.js / ReactTypeScriptTailwind CSSViem / Wagmi / Ethers.jsRainbowKit / ConnectKitGit & Vercel

4. Proof-of-Work & Prep

Actionable Proof-of-Work

Live dApp links (hosted on Vercel/Netlify) connected to testnets (Sepolia) or mainnet, complete with public GitHub repositories
Open-source components or contributions to Web3 UI libraries on GitHub

Self-Study Prep

  • Master modern web development with React/Next.js and TypeScript first
  • Learn how to configure Wagmi and RainbowKit to handle multi-wallet connections
  • Practice building clone interfaces of famous dApps like Uniswap or OpenSea on a testnet

5. Apply & Interview

Application Strategy

Include live interactive dApp links in your CV where recruiters can directly connect their testnet wallets and try out your features
Find UI/UX bugs in the target company's dApp, fix them locally, and show a video recording of the fix when applying

Interview Prompts

"How do you handle situations when a user transaction is pending on the blockchain network for over 5 minutes on the UI side?"

"Explain the architectural difference between using Ethers.js versus Viem + Wagmi in modern Next.js apps."

6. Guide Roadmap

Step 1

Modern Frontend Foundation

Master React.js, Next.js, TypeScript, and Tailwind CSS.

Step 2

Web3 Integration Tools

Proficient in using Viem, Wagmi, and RainbowKit for smart contract interaction.

Step 3

Full dApp Project Development

Build 2 functional dApps (e.g., staking dashboard & NFT marketplace) on testnet.

Step 4

Frontend Engineer Application

Apply for Web3 Frontend/Fullstack positions with a live app portfolio.