Senior Penetration Tester (US)

Company Description

BreachLock is a global leader in Offensive Security including Red Teaming, Continuous Attack Surface Discovery and Penetration Testing services. We help organizations discover, prioritize, and mitigate exposures with evidence-backed Attack Surface Management, Penetration Testing, and Red Teaming. BreachLock provides an attacker's perspective that goes beyond standard vulnerabilities, enabling organizations to build a comprehensive, proactive defense strategy.

Role Description

Penetration Tester (Mid-Senior) | Full-Time | Remote (US)

As a penetration tester on BreachLock's US Strategic delivery team, you'll execute manual, methodology-driven engagements across web applications, APIs, and internal networks — including assumed breach simulations — for enterprise clients. You'll work directly with delivery leadership, contribute to internal tooling and quality systems, and help raise the bar for the team around you.

Key Responsibilities

• Execute web application, API and mobile penetration tests with a focus on manual testing beyond automated scanning — business logic, authentication abuse, authorization flaws, and injection chains
• Conduct internal network assessments, external network assessments and assumed breach engagements, including Active Directory enumeration, lateral movement, privilege escalation, and post-exploitation
• Leverage frameworks including MITRE ATT&CK, PTES, and OWASP to structure assessments and findings
• Develop and contribute to internal tooling — automation scripts, reporting utilities, and workflow improvements using Python, Bash, or similar
• Participate in QA review cycles, providing structured feedback on findings, CVSS scoring accuracy, and report quality
• Mentor junior testers through technical guidance and finding review
• Collaborate with delivery leadership on scoping, client kickoff calls, and remediation guidance

Requirements

• 3–5 years of professional penetration testing experience in a delivery or consulting context
• Strong web application and API testing fundamentals — Burp Suite proficiency, OWASP Top 10 and beyond, authentication and session management testing
• Solid internal network assessment skills — AD enumeration, Kerberoasting, NTLM relay, ADCS misconfigurations, assumed breach methodology
• Proficiency in scripting and automation (Python, PowerShell, Bash)
• Strong written communication — capable of writing clear, accurate, well-scoped findings independently
• Familiarity with PTaaS delivery models or platform-based reporting workflows is a plus
• US-based and eligible to work without sponsorship
• Preferred
• Experience with C2 frameworks (Cobalt Strike, Havoc, Sliver, or similar)
• Active involvement in cybersecurity communities, research, or bug bounty programs
• Certifications such as OSCP, BSCP, CRTO, GWAPT, GPEN, or equivalent practical credentials
• Experience with SIEM platforms or EDR tools from an adversarial perspective