Senior Blockchain Developer Web3 Integrations
Overview
We’re seeking a Senior Blockchain Developer to lead the technical implementation of cutting‑edge Web3 integrations across multiple blockchain ecosystems. You’ll be responsible for architecting and developing complex integrations with DID providers, Layer 2 solutions, educational platforms, and DeFi protocols while building scalable on‑chain identity and reputation systems. This role is perfect for an experienced blockchain developer who thrives on solving complex multi‑chain challenges, implementing innovative Web3 protocols, and driving the future of decentralized professional networking. Candidate requirements
- 4+ years of blockchain development experience with production deployments
- Strong Solidity development skills with experience in complex smart contract architecture
- Multi‑chain development experience (Ethereum, Base, Solana, Polygon)
- Deep understanding of EVM and blockchain fundamentals
- Experience with Layer 2 solutions (Optimism, Arbitrum, Base)
- Advanced knowledge of smart contract security best practices and audit processes
- Experience with OpenZeppelin contracts and established patterns
- Proficiency in testing frameworks (Hardhat, Foundry, Truffle)
- Understanding of gas optimization techniques and contract upgradeability
- Experience with multi‑signature wallets and timelock mechanisms
- Extensive experience with Web3.js/Ethers.js and blockchain API integration
- Wallet integration expertise (MetaMask, WalletConnect, Phantom, Rainbow)
- Experience with IPFS/Arweave for decentralized storage
- Knowledge of GraphQL for blockchain data querying (The Graph Protocol)
- RESTful API development for Web3 applications
- Understanding of DeFi protocols (Uniswap, Aave, Compound)
- Experience with token standards (ERC‑20, ERC‑721, ERC‑1155, SPL tokens)
- Understanding of tokenomics and mechanism design
- Experience with stablecoin integration and payment rails
Desirable
- Experience with zero‑knowledge proofs (zk‑SNARKs, zk‑STARKs)
- Knowledge of account abstraction (ERC‑4337) and gasless transactions
- Familiarity with MEV protection and transaction optimization
Job responsibilities
- Design and develop smart contracts for identity verification, attestation systems, and reputation scoring
- Implement cross‑chain bridges and multi‑chain wallet integration
- Build escrow systems and payment processing for freelancer marketplace
- Develop tokenized bounty and referral systems with automated distributions
- Integrate with Base L2, Solana, and other blockchain networks
- Implement Layer 2 scaling solutions and optimize gas costs
- Build cross‑chain attestation services and reputation portability
- Develop multi‑signature wallet systems and account abstraction
- Implement zero‑knowledge proof verification systems
- Build privacy‑preserving authentication mechanisms
- Develop on‑chain credential verification and attestation systems
- Integrate stablecoin payment systems (USD1, USDC, etc.)
- Implement yield farming and staking mechanisms
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