Full-Stack Engineer (React/TypeScript, Web3) for Ethereum Token App

Data Lake is a decentralized science company. Our ecosystem helps patients reach better treatments through registries, patient-support programs, and software for research consents. LAKE is the utility token for that community. We are looking for a full-stack engineer to take the Data Lake Token App to a production release on Ethereum mainnet. THE PROJECT The Token App is a React and TypeScript app where users connect a wallet to view LAKE stats, claim vested tokens, buy crypto through Transak, swap, and provide Uniswap v3 liquidity. A Go API, built by our Golang Engineer, serves LAKE price and circulating supply. Signing always stays in the user's wallet. The app never holds keys. The app works, but it is not ready for mainnet. It still targets a retired testnet, some failures show up as a $0 value instead of an error, and the wallet connection uses a WalletConnect version that has been shut down. WHAT YOU WILL DO - Move the app and its configuration from the retired testnet to Ethereum mainnet - Make every dashboard number correct, or clearly marked unavailable. A silent 0 is not acceptable - Replace WalletConnect v1 with a supported wallet connection - Agree the API contract with the Golang Engineer and integrate the app with it, including errors and stale data - Own the app's deployment, environment configuration, and monitoring - Add tests for the logic users rely on, especially vesting amounts and price figures - Write short release notes and a rollback plan for each deployment WHAT YOU BRING - 4+ years of React and TypeScript in production - Hands-on experience with ethers.js or viem, wallet connections, and reading contract data - Enough backend experience to agree an API contract, read a Go service, and debug across the client and the API - Experience deploying and running a frontend in production: CI, environment configuration, error monitoring - Experience with Uniswap v3 positions or other DeFi frontends is a strong plus - You find bugs by running the app, and you write down how to reproduce them - Clear written English HOW WE HIRE 1. Proposal review. Tell us about one web3 frontend you shipped and what you owned in it. 2. Paid technical assessment (4 hours, fixed fee through Upwork). 3. A 45-minute call about your assessment. No live coding. 4. Offer.