Job Description

Feldspar & Flint is a NYC metro-based Recruiting firm dedicated to identifying and providing exceptional candidates to meet the specific needs of our clients.

Job Summary:

We are seeking a highly skilled and experienced Senior Blockchain Engineer with a strong background in Solidity development and Quantitative Finance. The ideal candidate will possess deep expertise in financial instruments such as derivatives, swaps, lending, repo markets, collateral management, and liquidation , along with a solid understanding of blockchain technology and smart contract development .

You will play a key role in designing, developing, and deploying secure and scalable smart contracts that power next-generation DeFi infrastructure.

Key Responsibilities:

• Design, develop, test, and deploy smart contracts using Solidity for complex QuantFi use cases.
• Collaborate with product and finance teams to translate financial models into blockchain-based solutions.
• Conduct rigorous security testing using tools like Slither and Mythril to ensure contract integrity.
• Utilize frameworks such as Hardhat and Foundry for development and testing.
• Write scripts and automation tools using JavaScript or TypeScript .
• Participate in code reviews, audits, and continuous improvement of smart contract architecture.
• Stay current with DeFi trends, security best practices, and emerging technologies.

Must-Have Qualifications:

• Bachelor’s degree in Computer Science , Engineering , Finance , or a related STEM field.
• Proven experience in Quantitative Finance , including derivatives, lending, and collateral systems.
• Strong proficiency in Solidity and smart contract development.
• Experience with Solidity security testing tools (e.g., Slither, Mythril).
• Hands-on experience with Hardhat and/or Foundry .
• Proficiency in scripting languages such as JavaScript or TypeScript .

Nice-to-Have Qualifications:

• Experience building or contributing to DeFi infrastructure , especially in areas like derivatives, collateral, lending, risk management, or compliance.
• Familiarity with on-chain risk modeling and oracle integration.
• Contributions to open-source blockchain projects.

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