Senior Penetration Tester (AWS)

The role

You will run hands-on penetration tests and red team exercises across AWS, infrastructure and backend applications. You will also do code audits and work with blue team partners to strengthen detection and response.

What you will do

• Conduct comprehensive code audits across internal applications and infrastructure.
• Conduct comprehensive penetration tests across cloud environments (AWS), infrastructure, and backend applications.
• Collaborate with detection engineering, threat intelligence, and incident response groups to review security controls and find coverage gaps.
• Build, maintain, and evolve custom offensive tools, scripts, and automation frameworks.
• Offer offensive security expertise during incident investigations, including log analysis and root cause reviews.
• Keep up with evolving threats and attack methods; share research internally and engage with the security community.
• Own offensive security projects from start to finish and mentor junior team members.

Required qualifications

• 5+ years of experience in offensive security, penetration testing, red teaming, or a closely related field.
• Extensive experience with conducting code audits to identify and remediate security issues.
• Experience with binary exploitation.
• Mastery of AWS and specific attack techniques and configuration weaknesses.
• Strong understanding of adversary tactics and frameworks like MITRE ATT&CK.
• In-depth knowledge of web application security, including OWASP Top 10, ASVS, and common vulnerability categories.
• Proficiency using offensive security tools such as Burp Suite, nuclei and similar frameworks.
• Strong programming skills in Python, Go, or similar languages, with experience developing tools or automation.
• Excellent written and verbal communication skills, with the ability to present technical details as clear, risk-focused recommendations.
• A natural ability to think like an attacker and assess risk across complex systems.

Nice to have

• Web3 / blockchain security exposure: smart contract auditing, bug bounty hunting (e.g., Immunefi, Code4rena), or DeFi protocol review.
• Familiarity with Ethereum L1 / L2 node architecture and security risks.
• Experience in blockchain infrastructure penetration testing.

Benefits

• Remote-first global workforce and NY office
• Professional reimbursement program (industry conferences, certifications, and more)
• Medical, dental and vision coverage (US and some other countries)
• 401k retirement plan with company match (US only)
• Wellness stipend
• Home office setup and ergonomic equipment program

Before you apply

• 401k company match is for US only; medical coverage is for US and some other countries.

About the company

Offchain builds the Arbitrum stack that powers Arbitrum One, a widely adopted Ethereum scaling solution. The company is backed by $124 million in funding.