Senior Web Application Penetration Tester

SIXGEN; Alexandria (VA); Remote; USD 125,000 - 165,000; Full time

Benefits offered by this job

Health insurance

Disability insurance

401K with employer contribution

Professional development reimbursement

Flexible remote work policies

Flexible PTO

Job summary

SIXGEN is seeking a Senior Web Application Penetration Tester to join the cyber operations team. The role emphasizes in-depth assessments beyond automated scans, testing web apps, APIs, mobile apps, and supporting infrastructure using custom tools and advanced exploitation methods.

The candidate should have 5+ years of experience, familiarity with cloud/post-exploitation, and ability to obtain a Secret Clearance. Remote work with up to 10% travel is offered, with competitive rewards and benefits.

Qualifications

• 5+ years of experience in web application pentesting or offensive cybersecurity.
• Demonstrated experience performing manual web app security assessments.
• Knowledge of modern web vulnerabilities, attack methods, and exploitation techniques.

Responsibilities

• Conduct penetration testing of web applications, APIs, mobile apps, databases, and client-side tech.
• Perform enumeration, vulnerability research, and exploitation activities.
• Identify, validate, and assess vulnerabilities across complex environments.

Skills

Web pentesting

Manual testing

Vulnerability research

Exploitation techniques

Network mapping

Report writing

Tools

Burp Suite

Nessus

Wireshark

Metasploit

Kali Linux

Job description

SIXGEN's mission is to deliver agile, mission-ready cybersecurity solutions that empower government and critical infrastructure organizations to stay ahead of advanced cyber threats. We combine innovation, deep expertise, and cutting-edge capabilities to uncover vulnerabilities, protect vital systems, and ensure operational superiority in an ever-evolving digital landscape.

Position Overview

Position: Senior Web Application Penetration Tester

Job Type: Full-time

Location: Remote

Clearance Requirements: Must be able to obtain a Secret Clearance

Travel Requirements: Up to 10%

Experience: 5+ years

Salary

$125-$165K

What You'll Do

We are seeking a skilled and motivated Senior Web Application Penetration Tester to join our growing cyber operations team. The ideal candidate will possess deep expertise in web application security testing, vulnerability research, and exploitation techniques, with the ability to identify complex attack paths and develop creative solutions to challenging security problems. This role goes far beyond automated scanning. Successful candidates will conduct in-depth assessments of web applications, APIs, mobile applications, and supporting infrastructure while leveraging custom tooling, manual testing techniques, and advanced exploitation methodologies to uncover impactful security findings.

Key Responsibilities

• Conduct penetration testing of web applications, APIs, mobile applications, databases, and client-side technologies.
• Perform application enumeration, endpoint discovery, vulnerability research, and exploitation activities.
• Identify, validate, and assess vulnerabilities across complex environments.
• Analyze attack paths and security weaknesses to determine business and operational impact.
  

Technical Analysis & Research

• Develop and utilize custom tools, scripts, and payloads to support testing activities.
• Perform network mapping, vulnerability analysis, and security assessments across applications and supporting infrastructure.
• Research emerging vulnerabilities, attack techniques, and exploitation methodologies.
• Support post-exploitation activities involving cloud and enterprise environments when applicable.
  

Client Engagement & Reporting

• Collaborate with clients and internal teams to define scope, review findings, and recommend remediation strategies.
• Communicate technical concepts and findings to both technical and non-technical stakeholders.
• Produce comprehensive reports, including detailed findings, exploitation procedures, risk analysis, and mitigation recommendations.
• Participate in client meetings and provide ongoing updates throughout assessment activities.
  

Qualifications

• 5+ years of experience in web application penetration testing or offensive cybersecurity.
• Demonstrated experience conducting manual web application security assessments.
• Knowledge of modern web application vulnerabilities, attack methodologies, and exploitation techniques.
• Experience with network mapping, vulnerability scanning, and penetration testing methodologies.
• Familiarity with NIST 800-series standards and cybersecurity best practices.
• Experience developing scripts, payloads, or custom testing tools.
• Strong analytical, problem-solving, and communication skills.
  

Preferred Certifications

• CWES (preferred)
• CWEE (preferred)
• OSCP
• OSWA
• OSWE
• CRTO
• GWAPT
• Other relevant hands-on offensive security certifications
  

Preferred Qualifications

• Experience with cloud environments and post-exploitation activities.
• Experience with Active Directory security assessments.
• Familiarity with FISMA compliance requirements.
• Experience supporting government or regulated industry clients.
• Proficiency with common offensive security tools and frameworks.
  

COMPENSATION & BENEFITS

At SIXGEN, we are committed to fair and equitable compensation practices. Compensation for this role will be based on experience, qualifications, technical expertise, and overall alignment with the position.

• Employer-paid health insurance premiums (medical, dental, vision) for you and your family
• Employer-paid short/long term disability insurance and basic life/AD&D insurance
• 401K with a 4% employer contribution
• Professional development reimbursement options available (training, certification, education, etc)
• Flexible and remote work policies for most positions
• Flexible PTO and holiday schedule
  

For more information, please reach out to our Director of Human Resources, Amy Maxwell at [e-mail].

OUR COMMITMENT

SIXGEN is an Equal Opportunity Employer. We ensure that all applicants are considered for employment without regard to race, color, religion, sexual orientation, gender identity, national origin, disability, age, marital status, ancestry, projected veteran status, or any other protected group or class. We are committed to fostering an inclusive culture that values diversity in our people, reflecting the communities we serve and our customer base. We strive to attract and retain a diverse talent pool and create an environment where everyone is empowered to be their authentic selves at work.