Senior Blockchain/Web3 Engineer

About the role

This role focuses on the development and deployment of secure wallet features within Web3 products. The work includes creating wallet connections, handling transaction signing, managing token transfers, and supporting NFTs. Additionally, the engineer will be responsible for smart contract interactions and Web3 authentication, ensuring robust and secure systems for various blockchain applications.

The position requires building blockchain features for a range of platforms, including DeFi, wallets, GameFi, and other ecosystem tools. A core part of the job involves writing secure and gas-efficient Solidity code, along with developing comprehensive unit tests, integration tests, and deployment scripts. The engineer will also integrate these smart contracts with backend services, frontend applications, APIs, and blockchain infrastructure.

Success in this role means contributing to all stages of the smart contract lifecycle, from design and development to deployment and ongoing monitoring. This includes reviewing existing code, supporting security audits, and resolving production issues. The engineer will also research new blockchain protocols and EVM improvements, contributing to best practices and technical documentation within the team.

The listed salary for this position is 180,000 USD.

Skills that matter here

• Solidity: This role requires strong experience in writing secure and gas-efficient smart contracts using Solidity for Web3 products.
• smart contracts: The engineer will design, develop, test, and deploy smart contracts, and integrate them with various systems.
• EVM: A good understanding of Ethereum / EVM architecture, gas optimization, and smart contract security within the EVM ecosystem is essential.
• JavaScript: Experience with JavaScript, TypeScript, Python, or similar backend technologies is needed for backend integration.
• Web3: The role involves building secure wallet features for Web3 products and integrating with Web3 tools like Hardhat and Ethers.js.
• DeFi: Knowledge of DeFi concepts such as AMMs, staking, lending, and liquidity pools is required for building blockchain features.

Who this role suits

• A developer with at least 1-2 years of experience specifically in blockchain, Web3, crypto, or DeFi projects.
• Someone who is proficient in Solidity and has a deep understanding of EVM architecture and smart contract security.
• An individual who can deploy and maintain smart contracts on both testnet and mainnet, and integrate them with diverse backend and frontend systems.
• A candidate who is familiar with common blockchain security risks and can contribute to code reviews and security audits.

From the employer

Duties/Responsibilities

• Design, develop, test, and deploy smart contracts for Web3 products
• Build blockchain features for DeFi platforms, wallets, GameFi, and ecosystem tools
• Write secure and gas-efficient Solidity code
• Create unit tests, integration tests, and deployment scripts
• Integrate smart contracts with backend services, frontend apps, wallets, APIs, and blockchain infrastructure
• Review existing smart contract code and suggest improvements
• Support audits, security reviews, and vulnerability remediation
• Monitor deployed contracts and help resolve production issues
• Research new blockchain protocols, DeFi mechanics, and EVM improvements
• Contribute to technical documentation and best practices

Required Skills

• 3+ years of software development experience
• 1–2+ years of experience in blockchain, Web3, crypto, or DeFi projects
• Strong experience with Solidity and smart contract development in the EVM ecosystem
• Good understanding of Ethereum / EVM architecture, gas optimization, token standards, and smart contract security
• Experience with Web3 tools such as Hardhat, Foundry, Remix, MetaMask, Ethers.js, Web3.js, Viem
• Experience deploying and maintaining smart contracts on testnet and mainnet
• Knowledge of DeFi: AMMs, staking, lending, bridges, oracles, stablecoins, and liquidity pools
• Backend integration experience: APIs, indexers, event listeners, wallets, or transaction services
• Understanding of common blockchain security risks
• Experience with JavaScript, TypeScript, Python, Node.js, or similar backend technologies
• Familiarity with Git, CI/CD, testing frameworks, code reviews, and documentation