Senior Penetration Tester

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

• 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

• Competitive compensation and performance-based equity opportunities

• Flexible work hours with hybrid remote options

• Opportunity to work with international cybersecurity experts

• Strong career progression in a rapidly expanding early-stage company

• Exposure to cutting-edge research, tools, and techniques in offensive security

Additional Organization Details

• BreachLock Website
• Leadership Team
• Meet the BreachLockers Video Series
• Reuters Coverage
• CEO Interview – Cybercrime Magazine
• Seemant Sehgal Interview on RT4 & RTLZ