Javascript Web3 Jobs in North America

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Job Position Company Posted Location Salary Tags

Feldspar & Flint LLC

United States

$160k - $165k

Kiln

New York, NY, United States

$87k - $87k

Baxus

New York, NY, United States

$150k - $200k

PIP Labs

United States

$105k - $171k

travoom

Austin, TX, United States

$87k - $87k

Figment

Canada

$135k - $149k

Blockstream

Mountain View, CA, United States

$98k - $110k

Brave

New York, NY, United States

$54k - $120k

Brave

San Francisco, CA, United States

$84k - $90k

Bitgo

Palo Alto, , United States

$165k - $210k

Bitgo

Palo Alto, CA, United States

$150k - $180k

Robinhood

Toronto, Canada

$145k - $170k

Tether

Mexico

$36k - $54k

Tether

Mexico

$36k - $54k

Tether

Mexico

$36k - $54k

Feldspar & Flint LLC
$160k - $165k
NJ Hudson County US
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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.