Frontend Engineer

This position is a good fit for a Mid-to-Senior Frontend Engineer with strong React and TypeScript skills who is interested in Web3 and DeFi products. It suits someone experienced in building performant, real-time user interfaces, comfortable collaborating with backend teams, debugging complex UI issues, and working with modern Git-based workflows. The ideal candidate is curious about on-chain trading, eager to learn Web3 technologies (e.g. ethers.js/web3.js), and motivated to build scalable frontend features for multi-chain analytics and trading platforms.

1. How do you structure a React + TypeScript codebase for a data-heavy trading dashboard?
   I organize by domains/features (e.g. markets, wallet, portfolio) with shared UI and hooks in separate folders, use strict TypeScript types for API and on-chain data models, and encapsulate data fetching in hooks (e.g. useMarketsData) to keep components focused on presentation.

2. How would you integrate a Web3 wallet (e.g. MetaMask, WalletConnect) into a React app?
   I’d use an abstraction layer (like wagmi or a custom hook) that handles provider detection, connection, chain switching, and account state, expose that via React context, and build UI around connection status, errors, and network mismatches with proper event listeners on accountsChanged and chainChanged.

3. Explain how you’d fetch and display real-time DEX price and liquidity data efficiently in the UI.
   I’d combine websockets or RPC subscriptions for live updates with periodic REST/GraphQL snapshots, normalize the data in a client store (e.g. Zustand or RTK Query), and throttle/debounce UI updates or use windowing for large tables to avoid unnecessary re-renders.

4. How do you handle signing and sending transactions from the frontend while keeping the UX safe and clear?
   I clearly separate simulation and signing steps, show a summary of what the user is signing (token, amount, slippage, chain), use the wallet provider to request signatures, and provide clear status states: pending, in-mempool, confirmed, failed—with links to the block explorer and robust error handling.

5. What’s your approach to managing application state in a complex Web3 app (balances, positions, settings, modals)?
   I keep server/on-chain data in a query layer (React Query or similar) and use a lightweight global store (Zustand, Redux Toolkit) for UI state and user preferences, avoiding a single monolithic store and ensuring derived data is memoized and computed in selectors, not components.

6. How would you design a reusable component for showing token amounts and prices across chains?
   I’d define a shared Token and TokenAmount type, then build a presentational component that accepts these types plus formatting options (fiat vs token, decimals, chain badge), so the component is purely deterministic and independent of fetching logic.

7. How do you optimize a React UI that renders fast-moving price charts and order books?
   I rely on canvas or performant chart libs optimized for real-time data, batch updates, use React.memo/useCallback where appropriate, avoid passing new object references unnecessarily, and offload heavy computations to web workers if needed.

8. Describe how you’d use AI tools (e.g. Copilot, Claude, Cursor) in your day-to-day frontend work without sacrificing quality.
   I use AI to scaffold components, tests, or boilerplate, and to explore alternative implementations, but I always review and refactor the generated code for correctness, security, and performance, and ensure it matches our patterns, typings, and linting rules.

9. How would you debug an issue where a user’s on-chain balance is correct in their wallet, but the UI shows an outdated value?
   I’d first verify the RPC / indexer responses in the network tab or via direct curl/web3 calls, then confirm cache settings and query keys in the client, check for stale polling intervals or missed subscription updates, and add logging around the balance-fetching hook to trace the data flow.

10. What security and UX considerations are specific to building a Web3 trading frontend?
    I avoid exposing private keys, never sign arbitrary strings without context, clearly indicate contract addresses and chains, validate user inputs on both client and backend, protect against phishing-like UI (e.g. spoofed tokens), and design flows that minimize accidental trades—like confirmations, slippage warnings, and clear display of what will actually be executed on-chain.

This position is a strong match for a front-end React/TypeScript engineer in Asia who wants to work fully remote on real DeFi infrastructure—building a multi-chain DEX data analytics and trading platform inside the Binance ecosystem. You’ll own core UI features in React/TS, work closely with backend and product on on-chain trading workflows, and optimize real-time, data-heavy interfaces where performance matters. It’s especially suited if you’re excited about Web3/DeFi, comfortable with modern Git-based workflows and AI-assisted development, and keen to deepen your experience with wallets, on-chain integrations (ethers.js/web3.js), and cross-chain trading experiences at massive global scale.