Blockchain Developer
Remote · full time
Practice the Blockchain Developer interview with an AI interviewer: voice, live coding and a scorecard.
Skills the interview covers
- Blockchain Development
- Solidity
- Smart Contracts
- Ethereum / Polygon / Solana
- Rust or Go
- Web3.js / Ethers.js
- Cryptography
- DeFi, NFTs, Token Standards
- API Integration
- Problem Solving
About the role
We are looking for a Blockchain Developer to join our dynamic team and work on cutting-edge blockchain applications. The ideal candidate will have a strong understanding of decentralized technologies, smart contracts, and cryptographic protocols, along with experience in designing and deploying secure, scalable, and efficient blockchain-based solutions.
You will be responsible for developing smart contracts, decentralized applications (dApps), and blockchain infrastructure, while collaborating closely with product managers, backend developers, and security engineers. This is a unique opportunity to build next-generation financial and non-financial applications on blockchain technology.
Responsibilities
Design, develop, test, and deploy smart contracts and dApps.
Work with blockchain protocols such as Ethereum, Polygon, Solana, Hyperledger, Polkadot.
Integrate blockchain applications with backend systems and APIs.
Ensure the security and efficiency of smart contracts.
Research new blockchain technologies and propose innovative solutions.
Collaborate with cross-functional teams to deliver blockchain-powered features.
Optimize gas fees, transaction speed, and scalability.
Maintain blockchain infrastructure and troubleshoot issues.
Skills & Qualifications
Strong knowledge of blockchain fundamentals, consensus algorithms, and cryptography.
Hands-on experience with Solidity, Rust, Go, or JavaScript for blockchain development.
Experience in writing and testing Ethereum smart contracts using frameworks like Truffle, Hardhat, Foundry.
Understanding of DeFi, NFTs, DAOs, and token standards (ERC-20, ERC-721, ERC-1155).
Familiarity with IPFS, Chainlink, The Graph.
Experience integrating Metamask, WalletConnect, or other Web3 wallets.
Strong understanding of RESTful APIs and WebSockets.
Knowledge of security practices for preventing vulnerabilities (e.g., reentrancy, integer overflow).
Broad skills in problem-solving, adaptability, communication, and teamwork