Senior Blockchain Engineer - $180k Job at Feldspar & Flint LLC, Hudson County, NJ

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  • Feldspar & Flint LLC
  • Hudson County, NJ

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.

Job Tags

Contract work,

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