About the jobWe are searching for a Senior Smart Contract Developer to architect and build the core tokenomics engine, powering an innovative gacha-based rewards system, NFT marketplace, and key producer alignment features.Job Responsibilities:Design and deploy production-grade smart contracts for our bottle NFT marketplace, including vault accounting, gacha reward mechanics, and distribution logic.Implement cryptographic randomness solutions using Chainlink VRF or alternative verifiable random functions to ensure fair, auditable reward draws.Build token economics infrastructure, including price oracles (TWAP), adjustment factors, fee distribution, and treasury management contracts.Architect staking and alignment systems that allow collectors to lock CRU tokens with producers, manage time-based incentives, and implement penalty mechanisms.Develop on-chain points and status tier logic or hybrid on-chain/off-chain solutions using Merkle proofs for gas optimisation.Implement anti-abuse mechanisms, including wash-trade detection, minimum holding periods, and suspicious activity throttling at the contract level.Design privacy-preserving patterns such as commit-reveal schemes or ZK approaches to maintain "mystery vault" UX while ensuring fairness.Collaborate with backend, product, and design teams to integrate smart contracts with off-chain services and deliver seamless user experiences.Conduct security audits and gas optimisation to ensure contracts are battle-tested, efficient, and resistant to common attack vectors.Champion best practices through comprehensive testing (Foundry/Hardhat), documentation, and code reviewsQualifications:3+ years of Solidity development with production experience deploying and maintaining smart contracts on EVM chains (Avalanche, Ethereum, Polygon, Base, Arbitrum, etc.)Deep understanding of ERC standards (ERC-20, ERC-721, ERC-1155) and NFT marketplace mechanics.Proven experience with DeFi primitives, including staking contracts, reward distribution, vesting schedules, and tokenomics implementation.Strong knowledge of Oracle integration (Chainlink Price Feeds, VRF) and secure randomness generation.Expertise in smart contract security, including common vulnerabilities (reentrancy, front-running, access control), testing frameworks (Foundry, Hardhat), and audit preparation.Gas optimisation experience and ability to balance on-chain vs. off-chain logic for cost-effective solutions.Familiarity with Web3 development tools (ethers.js, viem, wagmi) and backend integration patterns.Excellent communication skills, fluent in English, able to explain complex technical tradeoffs to non-technical stakeholdersNice to have:Experience with privacy-preserving techniques (commit-reveal, zero-knowledge proofs, encrypted state).Knowledge of game theory and tokenomics modelling, especially gacha/loot box mechanics.Familiarity with Merkle tree implementations for scalable claims and airdrops.Experience with upgradeable contract patterns (proxies, diamond pattern) and migration strategies.Background in quantitative analysis or financial modelling for emissions control and sustainability.Previous work on marketplace platforms or loyalty/rewards programs.Open-source contributions to Web3 tooling or DeFi protocols.Experience working with regulatory compliance requirements (KYC integration, geo-restrictions).
