DeFi Smart Contract Engineer: Secure, Scalable Solidity

Rather Labs; Wilmington (DE); On-site; USD 120,000 - 180,000; Full time

Benefits offered by this job

Healthcare benefits

Company computer

Paid holidays

Flexible working hours

Competitive salary

Career growth opportunities

Friendly and collaborative team

Job summary

Rather Labs is seeking a Smart Contract Engineer to join our blockchain engineering team in Wilmington. You will design, develop, test, and review smart contracts across EVMs and other ecosystems, partnering with auditors and product teams to build secure, scalable protocol software.

The ideal candidate brings hands-on experience with Solidity, DeFi protocols, and smart contract security, plus a security-first mindset and strong collaboration skills to ship production-ready code.

Qualifications

• Proven experience writing and auditing Solidity/EVM contracts.
• Hands-on testing with frameworks like Foundry or Hardhat.
• Strong understanding of DeFi protocols and token standards.
• Ability to design secure, maintainable smart contract code.
• Experience reviewing contracts and identifying vulnerabilities.
• Familiarity with common security tools and libraries (OpenZeppelin).
• Excellent analytical thinking and clear communication.

Responsibilities

• Design, develop, and maintain smart contracts for DeFi and blockchain apps.
• Write secure, clean, efficient, and well-tested Solidity code.
• Build and maintain automated tests with Foundry, Hardhat, Anchor, or similar.
• Review contract logic, architecture, and protocol design.
• Identify security risks, logic flaws, and attack vectors.
• Analyze DeFi risks like flash loans, oracle manipulation, and MEV.
• Use tools such as Slither, Mythril, Echidna, and Certora for security analysis.
• Support audits, remediation, fix verification, and deployment.
• Document decisions, security considerations, and implementation details.

Skills

Solidity/EVM

Foundry/Hardhat

DeFi protocols

Secure smart contracts

Testing/debugging

Smart contract security

OpenZeppelin familiarity

Analytical thinking/communication

Tools

Slither

Mythril

Echidna

Halmos

Manticore

Aderyn

Certora

Tenderly

OpenZeppelin

Job description

Rather Labs is seeking a Smart Contract Engineer to join our blockchain engineering team in Wilmington. You will design, develop, test, and review smart contracts across EVMs and other ecosystems, partnering with auditors and product teams to build secure, scalable protocol software.

The ideal candidate brings hands-on experience with Solidity, DeFi protocols, and smart contract security, plus a security-first mindset and strong collaboration skills to ship production-ready code.