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