Solidity Blockchain Engineer

• Design, develop, and test smart contracts using Solidity for Ethereum or EVM-compatible chains.
  

• Collaborate with frontend, backend, and protocol teams to define on-chain/off-chain integration.
  

• Write modular, gas-efficient, and auditable contract code.
  

• Design and run unit tests and security validations using frameworks like Hardhat or Foundry.
  

• Participate in code reviews and promote blockchain security best practices.
  

• Integrate smart contracts with Web3 frontends or backend services.
  

• Stay current on trends in the Ethereum ecosystem, including L2s and tooling.

Must-have

• 5+ years of experience in blockchain development with focus on Solidity.
  

• Strong understanding of Ethereum architecture, gas optimization, and security.
  

• Experience with testing and deployment tools (Hardhat, Foundry, Truffle).
  

• Familiarity with on-chain standards (ERC-20, ERC-721, ERC-1155).
  

• Understanding of smart contract upgradeability and design patterns.
  

• Fluent in English. Spanish is a plus.
  

Nice-to-have

• Knowledge of L2 solutions (Optimism, Arbitrum, zk-rollups).
  

• Experience working with oracles (Chainlink, Pyth).
  

• Familiarity with contract auditing and security tools.
  

• Exposure to DeFi protocols and composability patterns.
  

• Contributions to open-source Web3 projects.

• Fully remote work with real autonomy and global collaboration.
  

• Paid time off, birthday leave, and personal days.
  

• Continuous learning: English classes, internal workshops, and training discounts.
  

• Holistic well-being: psychological support, wellness activities, and access to 2,500+ lifestyle benefits.