Steadfast International Services, LLC is hiring a

Blockchain Lead

Job Title: Associate Director, Blockchain Engineering

Location: Jersey City, NJ / Tampa, FL (Hybrid: 3 days onsite – Tuesdays, Wednesdays, plus 1 flex day)

Type: Full-Time | Mid-Senior Level

Function: Information Technology

Industry: Financial Services

Overview:

We are seeking a seasoned Solidity Engineer with strong expertise in Quantitative Finance to join our blockchain engineering team. The ideal candidate should possess a deep understanding of financial instruments—such as derivatives, swaps, lending, repo markets, and collateral management—and a strong background in blockchain development and smart contract implementation.

Key Responsibilities:

• Design, develop, test, and deploy smart contracts for quantitative finance (QuantFi) applications.
• Model and implement complex financial instruments and systems.
• Collaborate with frontend/backend teams to integrate smart contracts into web platforms.
• Build cross-chain interoperability and work with various Layer 1 technologies.
• Conduct thorough code reviews ensuring security, performance, and quality.
• Maintain and enhance deployed smart contracts as business needs evolve.
• Stay up to date with blockchain and cryptographic innovations to identify and mitigate security risks.
• Work with product managers and stakeholders to define technical requirements and system architecture.
• Communicate blockchain concepts to both technical and non-technical team members.
• Debug and resolve issues with deployed smart contracts.

Required Qualifications:

• Bachelor’s degree in Computer Science, Engineering, Finance, or related STEM field.
• 7+ years of software development experience.
• Proven experience in Solidity development and Quantitative Finance.
• Background in finance, banking, or trading with understanding of financial systems and instruments.
• Strong knowledge of blockchain security principles and smart contract vulnerabilities.
• Proficiency with Hardhat, Foundry, and Solidity security tools (e.g., Slither, Mythril).
• Strong scripting skills in JavaScript or TypeScript.
• Experience with unit/integration testing and best development practices.

Preferred Qualifications:

• Advanced degree in Computer Science, Engineering, Finance, or a related field.
• Hands-on experience in DeFi infrastructure, including derivatives, lending, collateral, and risk systems.

Interview Process:

1. Initial Screening: HireVue
2. Technical Interview: Zoom with Hiring Manager
3. Final Round: Onsite Interview

Benefits Include:

• Performance-based bonus
• Health and life insurance
• Retirement plans
• Generous leave policy including personal/family care

Apply Now: