Blockchain Developer, Smart Contract Engineer (US, EU only)

Location: US or EU only

We are looking for a skilled Blockchain Developer / Smart Contract Engineer to join our engineering team and help design, build, and maintain secure smart contracts for decentralised applications, DeFi products, and blockchain protocols.

The ideal candidate has strong Solidity and EVM experience, a solid understanding of DeFi mechanics, and a security-first mindset when developing and reviewing smart contract systems.

Responsibilities

• Design, build, and maintain smart contracts for DeFi and blockchain applications.
• Write secure, clean, gas-efficient, and maintainable Solidity code.
  Develop and maintain automated tests using Foundry, Hardhat, Anchor, or similar frameworks.
• Review smart contracts for security vulnerabilities, bugs, edge cases, and protocol-level risks.
• Analyse and mitigate risks related to flash loans, oracle manipulation, MEV, governance attacks, and other DeFi threat vectors.
• Use security and analysis tools such as Slither, Mythril, Echidna, Certora, Tenderly, or similar platforms.
  Support audits, bug fixes, secure deployments, and post-deployment monitoring.
• Optimise gas usage, storage layout, and contract performance.
  Document technical decisions, protocol assumptions, and security considerations.

Requirements

• Strong experience with Solidity and EVM-based smart contracts.
  Hands-on experience with Foundry and/or Hardhat.
• Good understanding of Ethereum, gas optimisation, storage layout, events, and upgradeable contract patterns.
• Knowledge of DeFi concepts, including token standards, staking, lending, AMMs, bridges, vaults, and governance.
• Ability to write secure, reliable, and maintainable smart contract code.
• Experience testing, debugging, and reviewing smart contracts.
  Understanding of common smart contract vulnerabilities, including reentrancy, access control issues, oracle risks, precision errors, and front-running.
• Familiarity with OpenZeppelin libraries and proxy patterns.
  Strong attention to detail, ownership, and clear communication skills.

Nice to Have

• Experience with Rust, TypeScript, Solana, Anchor, NEAR, or other blockchain ecosystems.
• Previous experience building or auditing DeFi protocols.
  Knowledge of fuzz testing, formal verification, symbolic execution, or invariant testing.
• Experience with Ethereum, Arbitrum, Base, Optimism, Solana, NEAR, or similar networks.
• Experience with AMMs, lending protocols, bridges, staking systems, vaults, or governance mechanisms.
• Familiarity with Tenderly, Etherscan, Blockscout, The Graph, or other blockchain monitoring and indexing tools.

What We Offer

• Competitive salary.
• Healthcare benefits.
• Company-provided computer.
• Paid holidays.
• Flexible working hours.
• Career growth opportunities.
• A friendly, supportive, and collaborative engineering team.