Remote Web3 Blockchain Engineer: Smart Contracts & Security

CoinCortex Finance; United States; Hybrid; USD 120,000 - 160,000; Full time

Job summary

CoinCortex Finance is seeking a Blockchain Engineer to design, implement, and review smart contracts and protocol integrations that run in production for institutional clients.

You will work in Solidity and adjacent Web3 tooling with a security-first mindset, optimizing gas and upgrade paths while collaborating with product, security, and backend teams to align on-chain behavior with financial controls.

Qualifications

• 3+ years building smart contracts in Solidity or comparable languages.
• Production experience with Ethereum, EVM chains, and Web3 tooling.
• Strong grasp of security, gas optimization, and protocol design.
• Familiarity with testing frameworks, audits, and secure deployment practices.
• Ability to collaborate with product and backend teams on production releases.

Responsibilities

• Design, implement, and maintain smart contracts and protocol integrations
• Review code for security, correctness, gas efficiency, and upgrade safety
• Integrate Ethereum and EVM-chain infrastructure with CoinCortex services
• Write tests, deployment procedures, and operational documentation
• Support incident response and on-chain monitoring for production systems

Skills

Solidity

Ethereum experience

Web3 tooling

Security & gas optimization

Collaborative release process

Job description

CoinCortex Finance is seeking a Blockchain Engineer to design, implement, and review smart contracts and protocol integrations that run in production for institutional clients.

You will work in Solidity and adjacent Web3 tooling with a security-first mindset, optimizing gas and upgrade paths while collaborating with product, security, and backend teams to align on-chain behavior with financial controls.