Senior Security Engineer (Web3)

TL;DR

Senior Security Engineer (Web3): Leading security assessments, penetration tests, and code reviews across web, mobile, and cloud environments with an accent on Web3 applications and blockchain security. Focus on conducting comprehensive security audits, developing novel pentesting techniques, and contributing to industry-leading blockchain security research.

Location: Must be based in the US (Role is remote-eligible, but compensation and benefits are US-based).

Salary: $100,000 – $180,000

Company

A market-leading blockchain security firm backed by top-tier investors, securing billions in digital assets for enterprise clients.

What you will do

• Lead security assessments across web, mobile, thick client applications, and browser extensions.
• Perform external and internal network penetration testing and source code reviews.
• Conduct cloud security reviews across AWS, Azure, and GCP environments.
• Produce comprehensive pentest reports for both technical and non-technical stakeholders.
• Research and develop novel pentesting techniques specific to the blockchain space.
• Contribute to the security community through tooling, blog posts, and presentations.

Requirements

• Must be based in the US for employment and benefits eligibility.
• 4+ years of experience in application security and penetration testing.
• Strong source code review skills, specifically with JavaScript and TypeScript.
• Proven experience in mobile application penetration testing.
• Proficiency in scripting with Python and/or Bash.
• Solid understanding of cryptography and cloud platform security risks.
• BS/MS/PhD in Computer Science or Information Security.

Nice to have

• Web3 pentesting experience (exchanges, wallets, DApps, custody solutions).
• Smart contract audit experience.
• Browser extension security knowledge.
• Relevant certifications such as OSCP, OSWE, OSCE, or GWAPT.
• Participation in bug bounties or audit contests.

Culture & Benefits

• Full benefits package including medical, dental, and vision insurance.
• 401(k) retirement plan with company matching.
• Flexible Paid Time Off (PTO) policy.
• Opportunity to contribute to high-impact R&D in the blockchain security sector.