1 to 25 of 38 Security Penetration Tester Jobs

Cyber Security Engineer (Penetration Tester) Job Category: Information Technology Time Type: Full time Minimum Clearance Required to Start: Secret Employee Type: Regular Percentage of Travel Required: Up to 10% Type of Travel: Continental US The Opportunity: CACI seeks a motivated, mid-level Cyber Security Engineer to support the … C5ISR Center at Aberdeen Proving Ground, MD. You will join a team of cyber security engineers to perform vulnerability assessments for the Cyber Security (CS) Division at the Engineering and Services Innovation (ESI) Directorate. Responsibilities: Work on a small team of cyber engineers to perform security assessments in search of vulnerabilities … and identify mitigations. Conduct vulnerability assessments on web applications, networked devices, standalone software products, and other technologies as assigned using the penetration testing life cycle . Maintain test efficacy by identifying and applying new testing tools and techniques. Conduct research and development efforts to explore current and emerging technologies. Travel up to 10% of the time Qualifications More ❯

This position is contingent upon funding with an expected start date of December 2025 Top Secret / SCI Clearance required SRG is seeking a Red Team Penetration Tester III, you will be responsible for leading and executing complex penetration testing events and conducting offensive cybersecurity operations for the U.S. Government and … DoD systems. You will work collaboratively with Blue Team and Cybersecurity professionals to enhance the overall cyber posture. On-site only, no telework. Develop, modify, and utilize offensive security tools such as Metasploit, NMAP, Kali Linux, and Cobalt Strike Mimic threat actor behavior using TTPs aligned with frameworks like MITRE ATT&CK Conduct assessments across multiple operating … Mathematics with a concentration in Computer Science, or equivalent to above disciplines. Required Certification: • DoD 8570.01-M in accordance with (IAW) DFARS Baseline Certification, minimum CSSP Auditor. • Offensive Security Certified Professional (OSCP), or Offensive Security Certified Expert (OSCE), or Offensive Security Exploitation Expert (OSEE), or Offensive Security Wireless More ❯

This position is contingent upon funding with an expected start date of December 2025 Top Secret / SCI Clerance required SRG is seeking a Red Team Penetration Tester IV, you will be responsible for leading and executing complex penetration testing events and conducting offensive cybersecurity operations for the U.S. Government and … DoD systems. You will work collaboratively with Blue Team and Cybersecurity professionals to enhance the overall cyber posture. On-site only, no telework. Develop, modify, and utilize offensive security tools such as Metasploit, NMAP, Kali Linux, and Cobalt Strike Mimic threat actor behavior using TTPs aligned with frameworks like MITRE ATT&CK Conduct assessments across multiple operating … Mathematics with a concentration in Computer Science, or equivalent to above disciplines. Required Certification: • DoD 8570.01-M in accordance with (IAW) DFARS Baseline Certification, minimum CSSP Auditor. • Offensive Security Certified Professional (OSCP) required, plus one of the following certifications: Offensive Security Certified Expert (OSCE), Offensive Security Exploitation Expert (OSEE), or Offensive More ❯

At Vertical Structure (an Instil Company), we specialise in providing human-focused security and penetration testing services for web applications, cloud infrastructure and mobile applications. The Role We are looking for a CTL (Infrastructure) to join our dynamic team based in Belfast. As a Pen Tester, you will be part of … the delivery team, conducting penetration tests and vulnerability assessments across a range of technologies and a wide range of customers including software, fintech, manufacturing, engineering, legal, and public sector. Your insights will be crucial in identifying security weaknesses and helping clients fortify their systems. We offer varied, challenging work in a supportive environment where … tailored actionable recommendations. Manage end-to-end testing, collaborating with clients during kick-off and discovery sessions, providing expert advice and follow up. Stay current with the latest security threats, vulnerabilities, and trends. Research offensive security techniques to assess and validate infrastructure and technologies, including cloud-based systems continuously incorporating new techniques into the More ❯

Sr. Penetration Tester Job Category: Engineering Time Type: Full time Minimum Clearance Required to Start: TS / SCI with Polygraph Employee Type: Regular Percentage of Travel Required: None Type of Travel: None The Opportunity: Are you ready to shape the future of intelligence systems? CACI is seeking a talented Penetration Tester to join our team in Herndon, VA. If the idea of working with and among a team of true cyber security engineering experts with world class and unique skills excites you, then this might be the opportunity for you! Individuals with experience in or across a range of technical disciplines in IT and cybersecurity … career. You can learn more about our program by accessing the landing page: VORPAL Jobs () Responsibilities: You will lead small project teams with specific experience planning and executing penetration tests in a Windows environment. You will be called upon to solve technical puzzles every day using your breadth of computer, network, and applications pen-testing experience. As More ❯

PENETRATION TESTER: Senior and Expert Levels Location: Chantilly, VA US Security Clearance Requirement: TS / SCI with Full Scope Polygraph Clearance Status: Must be Current JOB DESCRIPTION: Inferno Systems is currently looking for Penetration Tester positions with a minimum of 7+ years experience conducting technical … security and / or vulnerability assessments. Please note the security clearance requirement above: candidates MUST have a current / active TS / SCI with Full Scope Poly to be considered. JOB SUMMARY: We are looking for Penetration Testers whose work will directly impact U.S. policymakers, military officials and law enforcement agencies. … architecture. • Understanding in cloud computing platform technologies such as AWS, Microsoft Azure, Google, cloud computing environment and cloud security. • Demonstrated real world experience performing gray and black box penetration testing. • Strong familiarity with some of the following: OWASP top 10, DoD and NSA Vulnerability and Penetration Testing Standards. • Understanding of basic IP fundamentals and More ❯

Responsibilities & Qualifications RESPONSIBILITIES Plan, execute, and document full-scope penetration tests and adversary emulation exercises. Develop, modify, and utilize offensive security tools such as Metasploit, NMAP, Kali Linux, and Cobalt Strike. Mimic threat actor behavior using TTPs aligned with frameworks like MITRE ATT&CK. Conduct assessments across multiple operating systems including Linux, Windows, and … tool developers, and RMF personnel to enhance overall cyber posture. REQUIRED QUALIFICATIONS Experience: Minimum of 7 years of full-time professional experience in each of the following: Conducting penetration testing or offensive cyber operations. Developing and using tools such as Metasploit, NMAP, Kali Linux, and Cobalt Strike. Mimicking threat behavior and adversary simulation. Working across Linux, Windows … . Certifications: DoD Approved 8570 Baseline Certification: Category CSSP Auditor (One of the Following): CEH CySA+ CISA GSNA CFR PenTest+ One or more of the following certifications: Offensive Security Certified Professional (OSCP) Offensive Security Certified Expert (OSCE) Offensive Security Exploitation Expert (OSEE) Offensive Security Wireless Professional (OSWP) Education More ❯

Responsibilities & Qualifications RESPONSIBILITIES Lead and execute complex Red Team penetration tests and cyber adversary emulation operations. Design, develop, and employ offensive tools using platforms such as Metasploit, NMAP, Kali Linux, and Cobalt Strike. Emulate threat actor TTPs based on MITRE ATT&CK, APT profiles, and emerging threat intelligence. Conduct assessments and attacks across various platforms, including Linux … Windows, and macOS. Exploit and manipulate Active Directory environments to assess internal and external threat postures. Perform exploit development and vulnerability research to identify and validate security flaws. Identify limitations in existing toolsets and develop custom techniques to improve effectiveness and stealth. Script and develop tools in at least three programming / scripting languages, such as Python … well as system owners, to document findings and support remediation strategies. REQUIRED QUALIFICATIONS Experience: Minimum of 10 years of full-time professional experience in Red Team operations and penetration testing, including: Developing and leveraging offensive tools such as Metasploit, NMAP, Kali Linux, and Cobalt Strike. Simulating adversary behavior and TTPs. Operating across Linux, Windows, and macOS environments. More ❯

Penetration Tester Job Category: Engineering Time Type: Full time Minimum Clearance Required to Start: TS / SCI with Polygraph Employee Type: Regular Percentage of Travel Required: None Type of Travel: None The Opportunity: CACI is seeking a talented Penetration Tester to join our team in Herndon, VA. If … the idea of working with and among a team of true cyber security engineering experts with world class and unique skills excites you, then this might be the opportunity for you! Be part of a department with an expanding range of programs focusing on Cyber Operations, where you get to grow on and between programs with peers … as prepaid courses to nationally recognized certification courses to grow your career. You can learn more about our program by accessing the landing page: VORPAL Jobs () Responsibilities: As Penetration Tester, you will be a part of planning and executing penetration tests in a Windows environment. You will be called upon to More ❯

Cyber Security - Penetration Tester Location: Belfast Hybrid (2 days in office / client site as required) Type: Full-time | Flexible working hours | Hybrid Our client is a long established and independent cyber security firm based in Belfast. As the premier NCSC-approved supplier for CHECK Penetration … to grow, having recently secured several high-impact, multi-year contracts across Northern Ireland, they're strengthening their technical team to meet demand. They are looking for experienced Penetration Testers who are passionate about cyber security, thrive on technical challenges, and want to be part of a trusted and growing consultancy. What You'll … Be Doing: Conducting penetration tests across infrastructure, applications, cloud environments, mobile platforms and operational technology. Performing both manual and automated testing using a range of tools and techniques. Producing clear, concise reports with actionable remediation advice tailored to client needs. Engaging directly with clients to understand requirements and deliver technical debriefs. Staying ahead of evolving threats, techniques More ❯

Penetration Tester Location: Fort Belvoir Work Type: Onsite Remote Work: No Job Description Are you looking for an opportunity to use your technical expertise and grow your skills to provide technical solutions in support of our warfighters? We're looking for a Red Team Penetration Tester to help … test, configure, and maintain military critical operating systems. As a Red Team Penetration Tester on our project, you'll work with other technical experts to help our customer overcome tough challenges and help improve the readiness of military units to perform their roles. Your communication skills will come in handy as you share your … 7+ years of experience in Information Technology, or Bachelor's degree and 3+ years of experience in Information Technology Linux Computing Environment (CE) Certification Windows CE Certification Offensive Security Certified Professional (OSCP) or GIAC Penetration Tester (GPEN) Certification DoD Approved 8570 Information Assurance Technician (IAT) Level III Certification, including CASP+ CE More ❯

As a Senior Security Penetration Tester , you will be responsible for supporting the design, implementation, and maintenance of TVM (Threat & Vulnerability Management) solutions, controls and processes across the organisation. You will be liaising with Digital teams to ensure appropriate mitigation and remediation of vulnerabilities detected across our IT estate. This role … as the ability to collaborate effectively with cross-functional teams. The ideal candidate will possess strong communication skills and will be committed to ensuring the highest level of security, compliance, and user experience. What you'll be doing as a Senior Security Penetration Tester Help support and develop … an internal penetration testing function. Conduct network, application penetration testing, code and security reviews. Identify and exploit vulnerabilities through proof-of-concept testing. Support vulnerability management across the enterprise, ensuring that a framework for identification, categorisation and mitigation exists and is implemented and maintained. Responsible for supporting the creation of the More ❯

Consultant – Cyber Security (Penetration Tester) RSM UK Greater London, England, United Kingdom Join or sign in to find your next job Join to apply for the Consultant – Cyber Security (Penetration Tester) role at RSM UK Consultant – Cyber Security (Penetration Tester) RSM UK Greater London, England, United Kingdom 2 weeks ago Be among the first 25 applicants Join to apply for the Consultant – Cyber Security (Penetration Tester) role at RSM UK Get AI-powered advice on this job and more exclusive features. Direct message the … our clients in achieving their strategic goals and empower our people to make an impact and develop their own unique career path. We are seeking an enthusiastic Cyber Security Consultant to join our team. Working alongside our experienced team of specialists, you’ll be delivering offensive security services including digital footprint reconnaissance, social engineering More ❯

Penetration Tester Job Category: Engineering Time Type: Full time Minimum Clearance Required to Start: TS / SCI with Polygraph Employee Type: Regular Percentage of Travel Required: None Type of Travel: None The Opportunity: Perform computer network evaluations to include penetration security assessments in a cybersecurity red team environment. … Perl or Ruby, Systems Programming is a plus. Existing Subject Matter Expert of Advanced Persistent Threats and Emerging Threats. Proactive interest in emerging technologies and techniques related to penetration testing. Demonstrated real world experience performing grey and black box penetration testing. Have an understanding of and interest in common web application vulnerabilities like XSS … understanding of networking, TCP / IP, virtualization and cloud / data center architecture. Strong familiarity with some of the following: OWASP top 10, DoD and NSA Vulnerability and Penetration Testing Standards. Knowledge of exploitation concepts including phishing and social engineering tactics, buffer overflows, fuzzing, SQLi, MiTM, covert channels, secure tunneling and open source exfiltration techniques. Bachelors degree More ❯

s teams are growing, and our software is in demand globally by firefighters, paramedics, hospitals and governments. To meet this demand, we are building an industry-leading cyber security team in Belfast to protect our customers and data from a variety of fast moving and constantly evolving threats. We are looking for an Application Security … are used to help our customers go about their daily job of protecting their communities and saving lives. You will refine our application design and protection using offensive security techniques like design assessment, research, threat intelligence, threat modelling, and controls optimization. You will conduct security assessments of our applications, identify issues, and help address … them early in the development cycle. You'll also support developers in improving coding practices to enhance security and assist with remediating findings from security assessments. Our Security Engineering team operates autonomously within a motivated and forward-thinking Security team. Join our diverse, growing team, working on mission More ❯

Consultant – Cyber Security (Penetration Tester) RSM UK Manchester, England, United Kingdom Join or sign in to find your next job Join to apply for the Consultant – Cyber Security (Penetration Tester) role at RSM UK Consultant – Cyber Security (Penetration Tester) RSM UK Manchester, England, United Kingdom 2 weeks ago Be among the first 25 applicants Join to apply for the Consultant – Cyber Security (Penetration Tester) role at RSM UK Get AI-powered advice on this job and more exclusive features. Direct message the job … support our clients in achieving their strategic goals and empower our people to make an impact and develop their own career path. We are seeking an enthusiastic Cyber Security Consultant to join our team. Working alongside our experienced team of specialists, you’ll be delivering offensive security services including digital footprint reconnaissance, social engineering More ❯

our clients in achieving their strategic goals and empower our people to make an impact and develop their own unique career path. We are seeking an enthusiastic Cyber Security Consultant to join our team. Working alongside our experienced team of specialists, you'll be delivering offensive security services including digital footprint reconnaissance, social engineering … penetration testing and vulnerability assessments to high profile clients across all industries. The purpose of this role is to deliver our offensive security services including digital footprint reconnaissance, social engineering, vulnerability assessments, penetration testing, threat modelling, cyber-attack simulation exercises, and more to high profile clients across all industries. You'll … making improvements, this role is perfect for you! We value diverse experiences and perspectives. Here's what we're looking for in our ideal candidate: Experience in offensive security and penetration testing. Demonstrable experience in infrastructure and web application testing; experience in API testing is desirable. Demonstrable experience using common pentesting tools including Kali More ❯

in the Belfast office / client site as required) Type: Full-time Flexible working hours Hybrid Essential: UK or Irish nationality, or an equivalent status that permits full security clearance (sponsorship is not available) . Cyber Guarded Ltd is a long-established and independent cyber security firm based in Belfast. As the premier NCSC … approved supplier for CHECK Penetration Testing in Northern Ireland, including Cyber Incident Exercising being conducted at the highest levels, along with Cyber Advisor Cyber Essentials, we support clients across both public and private sectors. We re looking for experienced Penetration Testers who are passionate about cyber security, thrive on technical challenges … and want to be part of a trusted and growing consultancy. Conduct infrastructure, app, cloud & OT penetration testing 2+ years paid employment in penetration testing Strong knowledge of networks, OS (Linux / Windows), web tech Proficient with Burp, Metasploit, Nessus, Kali Linux Eligible for full UK security clearance (no sponsorship offered More ❯

Role Summary: Join our dynamic Offensive Security Team! As we expand, we are looking for a Pentester / Red Teamer who is enthusiastic about undertaking a range of security assessments, including penetration testing, red team exercises, vulnerability scanning, and physical access evaluations for our clients. Key Responsibilities: Client Engagement Management: Lead … client projects, ensuring clear communication, timely delivery, and exceeding expectations. Act as the primary liaison, providing updates and guidance. Security Assessment Execution: Conduct detailed security assessments, including penetration testing and vulnerability analysis. Systematically identify and document vulnerabilities across network, application, and physical layers. Prepare concise reports for both technical and non … technical stakeholders. Red Team Challenges: Participate in red team simulations, encompassing social engineering attacks and advanced penetration tactics. Post-initial access, perform internal testing to escalate privileges and gain high-level access. Document methodologies and outcomes, providing actionable insights for enhancing security. Technical Proficiencies: Python / Scripting: Demonstrate a high level of proficiency in Python, essential for More ❯

Task Force Talent is seeking a Penetration Tester with an active TS / SCI FSP security clearance. Target salary range is 100k - 210k, depending on experience level. Our client for this role is a small company with very unique experience and expertise in cybersecurity and related areas. Candidates should have a … about networks, forensics, software engineering, or similar areas. This is uniquely rewarding, high-impact work that cannot be done elsewhere. _ NOTE: If you do not have an active security clearance, please apply here instead: _ Qualifications U.S. citizen with active TS / SCI FSP security clearance. (Sorry, we are unable to sponsor or upgrade clearance … s for this role.) Experience with: Grey and black box penetration testing and system exploitation against desktops, servers, applications, operating systems, and security systems to gain root and administrator access Performing reconnaissance, privilege escalation persistence, lateral movement, and payload generation against information systems Analyzing vulnerabilities, identifying network risks, and providing mitigation recommendations If you More ❯

Lead Cyber Security Consultant - Penetration Tester (UK) - Dionach by Nomios 1 day ago Be among the first 25 applicants Direct message the job poster from Dionach This role offers flexibility to work remotely, with occasional visits to client sites. Alternatively, you can choose a hybrid arrangement and work from our offices … Glasgow, if preferred. Why join Dionach by Nomios? Since being acquired by Nomios in late 2024, Dionach by Nomios has continued its dynamic growth as a leading information security company. Specializing in penetration testing and information assurance services, we offer an incredible opportunity to be part of an experienced team, build your skills, and … grow professionally. Dionach by Nomios holds impressive certifications, including CREST, CHECK, PCI QSA, and ISO 27001. With our focus on enhancing customers' security and fostering team development,be joining a company that prioritizes both your growth and the safety of our clients. We're in an exciting phase of expansion and are looking for self-motivated individuals More ❯

Dark Wolf Solutions is actively seeking an experienced Product and Hardware Security Penetration Tester to join our innovative team. This individual will play a critical role in assessing and enhancing the security of various products, including hardware, software, and embedded systems. This role demands a deep understanding of … penetration testing methodologies and advanced exploit development, focusing on identifying and mitigating vulnerabilities across a wide range of technologies. As a Senior Product and Hardware Security Penetration Tester, you will have the chance to work on cutting-edge technologies and contribute to the enhancement of security across a wide range of products. If you possess a strong background in penetration testing and a passion for cybersecurity, we encourage you to apply for this pivotal role. This position is set to be supported in a hybrid work environment out of Colorado Springs, CO. Key responsibilities include, but are not limited to More ❯

Zachary Piper Solutions is currently seeking a Penetration Tester who will support a government contract in Colorado Springs, CO . Responsibilities for the Penetration Tester: Conduct independent penetration testing, data collection, test automation, and reporting. Develop test tools and strategies for cybersecurity testing in DOD. … Perform system security analysis on systems and / or software to understand and identify vulnerabilities. Execute hands-on testing which include technical skills with multiple operating systems. (Windows, Linux, Unix) as well as various software / databases (Apache, SQL Server, Oracle, etc.). Provide technical guidance and support to penetration test teams. Document and … technical and non-technical user groups in written and oral formats. Provide technical support in the management, planning, and execution of CVI, ACD, and CVPA Qualifications for the Penetration Tester: 3 to 5 years of relative experience Clearance: Top Secret Need to have one of the following certifications: CISSP, CASP, OSCP, OSEP, OSWA, OSWE More ❯

the amazing things we offer. Did we also mention that we've been awarded Gold Investors in People for a fourth consecutive time? About the role A technical security expert with the ability to conduct penetration tests and the appetite to deliver a wide spectrum of interesting security-related work, seeking … a new challenge to join our growing Cyber team to help shape the company's security and compliance services nationwide for a leading IT and business consultancy, supporting national and international clients. Day to day responsibilities Leading and delivering web application penetration testing, with an expectation to participate in infrastructure penetration testing, vulnerability assessments, and security audits across various business functions as needed Lead technical scoping activities and understand a client's requirements to ensure they get the most out of their engagement with Waterstons Write clear, concise, and professional reports that are understandable to both technical and non-technical stakeholders. Maintain up-to-date More ❯

Penetration Tester / Cyber Security Analyst Country: United Kingdom Location: Remote Sector: Other Salary: GBP Market related Job Type: Contract Technologies: Penetration Testing, Hacking, Ethical Hacking, Cyber Security We are looking for a Penetration Tester with solid experience in … this role. Our client has previously outsourced these tasks and is now looking to bring them in-house. The Cyber Security Analyst will be responsible for designing and setting up the Penetration Testing Environment for both on-premise and cloud solutions. Security is essential given that our client manages multiple large More ❯