Lead Blockchain Developer - Arbitrum Prediction Market

ArbMarket is building a decentralized, non-custodial prediction market protocol on Arbitrum — think Polymarket, but Arbitrum-native from day one, with plans for ARB-denominated markets and Arbitrum ecosystem grant/incentive integration. What you'll own: Smart contract architecture (market factory, outcome-token minting/redemption, AMM pools, fee distribution, resolution module) on Arbitrum Migrating the frontend from the mock REST backend to a real indexer + direct contract calls (wagmi/RainbowKit wallet integration) Optimistic-oracle resolution design (propose → dispute window → finalize, UMA-style) Technical leadership as we scale the eng team post-conversion What we're looking for: Strong Solidity / EVM smart contract development experience (production-shipped, not just tutorials) Hands-on dApp development experience — frontend-to-contract integration, wallet connection flows, subgraph or custom indexers Comfortable in React.js and Node.js/Express (you'll need to read and extend our existing MVP codebase) Bonus: AMM or prediction-market-specific experience, familiarity with optimistic oracle patterns (UMA or similar), Arbitrum-specific deployment experience