NewLead Security Engineer with TS/SCI Poly LeidosLead Security Engineer with TS/SCI PolyAnnapolis Junction, MD$154,050–$278,475The selected individual will lead all security engineering efforts for a large, complex network environment with geographically distributed systems; and will manage a team of Information Systems Security Officers (ISSOs) and Information Systems Security Engineers (ISSEs), providing technical leadership and direction to meet program requirements. At least twelve years of experience with defense-in-depth principals/technology (including access control, authorization, identification and authentication, public key infrastructure, network and enterprise security architecture) and applying risk assessment methodology to system development.
NewSystems Integration Engineer (NDA-2) LeidosSystems Integration Engineer (NDA-2)Fort Meade, MD$73,450–$132,775Bachelor's degree plus 5-years of relevant experience, or master’s degree plus 3-years of relevant experience or an associate’s degree plus 7-years of relevant experience or high school diploma/GED plus 9-years of relevant experience may be considered. Relevant experience must be in computer or information systems design/development, programming, information/cyber/network security, vulnerability analysis, penetration testing, computer forensics, information assurance and/or systems engineering.
Senior ISSE/Penetration Tester TS/SCI Polygraph Leidos Holdings IncSenior ISSE/Penetration Tester TS/SCI PolygraphAnnapolis Junction, MD$131,300–$237,350 / yearThe selected candidate will have a range of day-to-day responsibilities across multiple activities, including the following: Validating and verifying system security requirements and establishing system security designs for large-scale systems, major system elements, and interfacing systems that are part of a large complex network environment with geographically distributed components. Must have experience developing and implementing integrated security services management processes, such as assessing and auditing network penetration testing, anti-virus planning assistance, risk analysis, and incident response.
Penetration Tester CACIPenetration TesterAberdeen Proving Ground, MarylandPay Range: There are a host of factors that can influence final salary including, but not limited to, geographic location, Federal Government contract labor categories and contract wage rates, relevant prior work experience, specific skills and competencies, education, and certifications. Expertise in exploitation techniques including buffer overflows, fuzzing, SQL injection, Man-in-the-Middle attacks, covert channels, secure tunneling, XSS, privilege escalation, and lateral movement.
Senior Web Application Penetration Tester SixGen, Inc.Senior Web Application Penetration TesterAnnapolis, MarylandSuccessful 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. 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.
Penetration Tester ManTechPenetration TesterFort Meade, MDBachelor of Science degree in Computer Science, Electrical Engineering, Computer Engineering, Physics or similar technical field and 10 years of penetration testing experience. + Lead the information assurance evaluation of target systems, including developing threat models, conducting security analysis and testing, demonstrating vulnerabilities and documenting the results.
Penetration Tester CACI International IncPenetration TesterAberdeen Proving Ground, MD$82,700–$173,900 / yearPay Range: There are a host of factors that can influence final salary including, but not limited to, geographic location, Federal Government contract labor categories and contract wage rates, relevant prior work experience, specific skills and competencies, education, and certifications. Expertise in exploitation techniques including buffer overflows, fuzzing, SQL injection, Man-in-the-Middle attacks, covert channels, secure tunneling, XSS, privilege escalation, and lateral movement.
NewCyber Vulnerability Analyst - Penetration Tester - TS/SCI w/ Poly Required ParsonsCyber Vulnerability Analyst - Penetration Tester - TS/SCI w/ Poly RequiredAnnapolis JunctionIn this role you will be responsible for simulating adversary tactics and working with other threat analyst team members to inform the proactive identification of cyber threats with the goal to prevent and eradicate threats to critical U.S. systems. We promote a culture of excellence and close-knit teams that take pride in delivering, protecting, and sustaining our nation's most critical assets, from Earth to cyberspace.
Senior ISSE/Penetration Tester BAE Systems PlcSenior ISSE/Penetration TesterAnnapolis Junction, MDfor description visit the url https://jobs.baesystems.com/global/en/job/BAE1US125477BREXTERNAL/Senior-ISSE/Penetration-Tester.
Cyber Vulnerability Analyst - Penetration Tester Parsons CorpCyber Vulnerability Analyst - Penetration TesterAnnapolis Junction, MD$134,100–$241,400 / yearIn this role you will be responsible for simulating adversary tactics and working with other threat analyst team members to inform the proactive identification of cyber threats with the goal to prevent and eradicate threats to critical U.S. systems. We promote a culture of excellence and close-knit teams that take pride in delivering, protecting, and sustaining our nation''s most critical assets, from Earth to cyberspace.
Senior Systems Security Specialist (Penetration Testing & Offensive Security) ASCENDING, Inc.Senior Systems Security Specialist (Penetration Testing & Offensive Security)Baltimore, MDWe are seeking a Senior Systems Security Specialist to lead and execute offensive security initiatives, including advanced penetration testing and red team engagements across networks, applications, APIs, and cloud environments. Responsibilities: Conduct internal and external penetration testing of networks, web applications, APIs, and cloud environments to uncover security vulnerabilities and exploit paths.
Systems Security Specialist - Penetration Testing MATRIX SYSTEMS & TECHNOLOGIES INCSystems Security Specialist - Penetration TestingBaltimore, MDMatrix Systems and Technology is seeking a Systems Security Specialist to perform internal and external penetration testing of networks, web applications, API's, and cloud environments to identify security vulnerabilities and exploit paths, and other related tasks. A minimum of five (5) years of working with NIST Cybersecurity Framework, NIST 800-53 or similar federal control frameworks, MITRE ATT&CK and OWASP Top 10 A minimum of five (5) years of experience mapping findings to security control frameworks.
SME Penetration Testing Analyst Leidos Holdings IncSME Penetration Testing AnalystGaithersburg, MD$131,300–$237,350 / yearLeidos Digital Modernization sector is seeking an experienced SME Penetration Testing Analyst to support the delivery, enhancement, and adoption of enterprise data and analytics products used across multiple DoD organizations. Ideal candidates are motivated by mission impact, comfortable operating in complex stakeholder environments, and interested in building deep domain expertise while delivering capabilities with real-world national security outcomes.
SME Penetration Testing Analyst LeidosSME Penetration Testing AnalystGaithersburg, VirginiaLeidos Digital Modernization sector is seeking an experienced SME Penetration Testing Analyst to support the delivery, enhancement, and adoption of enterprise data and analytics products used across multiple DoD organizations. Ideal candidates are motivated by mission impact, comfortable operating in complex stakeholder environments, and interested in building deep domain expertise while delivering capabilities with real-world national security outcomes.
Pen Tester | Annapolis Junction, MD (FS Poly Required) August SchellPen Tester | Annapolis Junction, MD (FS Poly Required)Annapolis Junction, MarylandThe selected individual will work on a team of cyber Subject Matter Experts (SMEs) who are providing support to a large, complex technical program for preventing, identifying, containing and eradicating cyber threats to networks through monitoring, intrusion detection, and protective security services on information systems including local area networks/wide area networks (LAN/WAN), commercial Internet connections, public facing websites, security devices, servers and workstations. A Lead Penetration Tester is needed to join a high performing agile team using the Scaled Agile Framework (SAFe) methodology on a large, complex program that provides system engineering, development, test, integration and operational support.
Senior Penetration Testing Analyst Leidos Holdings IncSenior Penetration Testing AnalystGaithersburg, MD$107,900–$195,050 / yearLeidos Digital Modernization sector is seeking an experienced Senior Penetration Testing Analyst Lead to support the delivery, enhancement, and adoption of enterprise data and analytics products used across multiple DoD organizations. Ideal candidates are motivated by mission impact, comfortable operating in complex stakeholder environments, and interested in building deep domain expertise while delivering capabilities with real-world national security outcomes.
Systems Security Specialist (Senior) ExpediteInfoTech, IncSystems Security Specialist (Senior)Rockville, MDOur clients include the US Department of Education, US Department of Transportation, US Department of Justice, US Department of Health & Human Services, Montgomery County government, Prince George's County Government, the governments of the State of Maryland and the District of Columbia. A minimum of five (5) years conducting network penetration testing, web application and API testing, internal and external vulnerability assessments and threat modeling and attack path analysis.
Lead Security Engineer with TS/SCI Poly Leidos Holdings IncLead Security Engineer with TS/SCI PolyMD$154,050–$278,475 / yearThe selected individual will lead all security engineering efforts for a large, complex network environment with geographically distributed systems; and will manage a team of Information Systems Security Officers (ISSOs) and Information Systems Security Engineers (ISSEs), providing technical leadership and direction to meet program requirements. At least twelve years of experience with defense-in-depth principals/technology (including access control, authorization, identification and authentication, public key infrastructure, network and enterprise security architecture) and applying risk assessment methodology to system development.
Senior Systems Security Specialist Digital Management LLCSenior Systems Security SpecialistBaltimore, MDDMI, LLC is seeking a Senior Systems Security Specialist to perform internal and external penetration testing of networks, web applications, APIs, and cloud environments to identify security vulnerabilities and exploit paths, and other related tasks. With a focus on end-to-end managed IT services, including managed mobility, cloud, cybersecurity, network operations, and application development, DMI supports public sector agencies and commercial enterprises around the globe.
Principal Cybersecurity Assessment Engineer Mitre CorpPrincipal Cybersecurity Assessment EngineerLexington Park, MD$172,800–$216,000 / yearBasic Qualifications: Requires a minimum of 10 years of related experience with a Bachelor's degree; or 8 years and a Master's degree; or a PhD with 5 years' experience; or equivalent combination of related education and work experience. This dual focus enables us to address the evolving needs of our sponsors, ensuring scalable and effective cybersecurity solutions that meet today's challenges and anticipate tomorrow's threats.
Lead Cybersecurity Assessment Engineer Mitre CorpLead Cybersecurity Assessment EngineerLexington Park, MD$158,800–$198,500 / yearBasic Qualifications: Requires a minimum of 8 years of related experience with a Bachelor's degree; or 6 years and a Master's degree; or a PhD with 3 years' experience; or equivalent combination of related education and work experience. This dual focus enables us to address the evolving needs of our sponsors, ensuring scalable and effective cybersecurity solutions that meet today's challenges and anticipate tomorrow's threats.
FIPS 140 Security Engineer StratAcuity Staffing Partners IncFIPS 140 Security EngineerColumbia, MD$55–$62 / hourIn terms of professional development, Everforth Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6+ months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA. Everforth Apex also offers a HSA (Health Savings Account on the HDHP plan), a SupportLinc Employee Assistance Program (EAP) with up to 8 free counseling sessions, a corporate discount savings program and other discounts.
Staff Engineer - Red Team (AI) GEICO GENERAL INSURANCE COMPANYStaff Engineer - Red Team (AI)Chevy Chase, MD$110,000–$260,000 / yearSuccess in this role means you can champion operations end-to-end: shape the scope and objectives, define safety controls and deconfliction, build or tailor emulation plans, execute advanced operator tradecraft in authorized environments, and deliver clear findings mapped to TTPs, telemetry gaps, and detection opportunities. Partner with defenders: work directly with Detection Engineering, Threat Intelligence, and Risk Management to validate telemetry coverage, tune detections, improve response playbooks, and close visibility gaps.
Engineering Project Manager CACIEngineering Project ManagerAberdeen Proving Ground, MarylandPay Range: There are a host of factors that can influence final salary including, but not limited to, geographic location, Federal Government contract labor categories and contract wage rates, relevant prior work experience, specific skills and competencies, education, and certifications. You'll have the opportunity to work across diverse technical and security domains, collaborating with subject matter experts, highly skilled engineers, and penetration testers while introducing modern project management methodologies to drive mission success.
Engineering Project Manager CACI International IncEngineering Project ManagerAberdeen Proving Ground, MD$75,200–$158,100 / yearPay Range: There are a host of factors that can influence final salary including, but not limited to, geographic location, Federal Government contract labor categories and contract wage rates, relevant prior work experience, specific skills and competencies, education, and certifications. You''ll have the opportunity to work across diverse technical and security domains, collaborating with subject matter experts, highly skilled engineers, and penetration testers while introducing modern project management methodologies to drive mission success.
Computer Engineer (Embedded HW) CACIComputer Engineer (Embedded HW)Aberdeen Proving Ground, MarylandPay Range: There are a host of factors that can influence final salary including, but not limited to, geographic location, Federal Government contract labor categories and contract wage rates, relevant prior work experience, specific skills and competencies, education, and certifications. You'll collaborate closely with penetration testers and other engineers, bringing your computer engineering expertise while cross-training in complementary disciplines to build comprehensive security assessment workflows.
Computer Engineer CACI International IncComputer EngineerAberdeen Proving Ground, MD$90,300–$189,600 / yearPay Range: There are a host of factors that can influence final salary including, but not limited to, geographic location, Federal Government contract labor categories and contract wage rates, relevant prior work experience, specific skills and competencies, education, and certifications. Youll collaborate closely with penetration testers and other engineers, bringing your computer engineering expertise while cross-training in complementary disciplines to build comprehensive security assessment workflows.
Network Exploitation Analyst EverwatchNetwork Exploitation AnalystAnnapolis Junction, Maryland$47.60–$108.18 / hour
Cyber Opportunities LeidosCyber OpportunitiesColumbia, MarylandFebruary 9, 2026For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above. Our talented team is at the forefront in Mission Software, Security Engineering, Computer Network Operations (CNO), Offensive Cyber, AI/ML, Analysis, Signals Intelligence (SIGINT), and Cryptographic Key Management.
Network Exploitation Analyst Booz Allen Hamilton IncNetwork Exploitation AnalystAnnapolis Junction, MD$99,000–$225,000 / yearAs an analyst on our team, you will provide expert analytic support while working alongside the mission owners to tackle complex and challenging problems in computer network analysis, network exploitation, digital network intelligence, dataflow, access development, and target network analysis. This will provide an opportunity to grow your expertise, develop new skills and tradecraft, use and share your methodologies and tool experience with other analysts, and most importantly, be a part of a team conducting offensive cyberspace operations that are crucial to national security.
Senior Backend Data Test Engineer StratAcuity Staffing Partners IncSenior Backend Data Test EngineerHome, MD$41–$46 / hourIn terms of professional development, Everforth Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6+ months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA. The Senior Backend Data Test Engineer will be responsible for validating large-scale data systems, ensuring data accuracy, integrity, and consistency across backend platforms and corresponding frontend/UI applications.
Lead Security Engineer Bart & Associates IncLead Security EngineerSuitland, MDWe are seeking a Subject Matter Expert (SME)level Lead Security Engineer to lead application security across a large-scale, cloud-native federal modernization program supporting the U.S. Census Bureaus Decennial Transformation and Application Modernization (DTAM) effort. In recognition of all these efforts, B&A has been named a Companies as Responsive Employers (CARE) award recipient by Northern Virginia Family Services and nominated by the Northern Virginia Chamber of Commerce for Outstanding Corporate Citizenship Award.
Security Engineer CACISecurity EngineerCollege Park, MarylandPay Range: There are a host of factors that can influence final salary including, but not limited to, geographic location, Federal Government contract labor categories and contract wage rates, relevant prior work experience, specific skills and competencies, education, and certifications. · Implement and manage security technologies including firewalls, intrusion detection/prevention systems (IDS/IPS), endpoint protection, and security information and event management (SIEM) tools.
Lead Security Engineer Revolutional, LLCLead Security EngineerSuitland, MDWe apply modern capabilities, including AI/ML, cloud, cybersecurity, and IT modernization to solve complex challenges, enable faster and more secure operations, and drive measurable mission outcomes. This program is driving a large-scale transformation of systems into a data-centric, cloud-native ecosystem capable of supporting high-volume, near real-time data processing and advanced analytics.
Application Security Engineer ConsultNetApplication Security EngineerRockville, MDThe ideal candidate brings strong hands-on application security expertise, experience integrating security into CI/CD pipelines, and the ability to leverage modern automation and GenAI technologies to scale secure code review and vulnerability analysis capabilities. For over 25 years, we have connected thousands of consultants with meaningful roles through a personal, communication-driven approach, partnering with a diverse client base to build high-performing teams and create lasting impact.
Application Security Engineer (REMOTE) EnerSysApplication Security Engineer (REMOTE)MDRemote$117,200–$146,600 / yearCollaborate within an expanding Cybersecurity team, and work closely with internal EnerSys teams to ensure new and continued compliance with cybersecurity frameworks and required programs and initiatives. Serve as a primary liaison between the Cybersecurity and development teams, ensuring security is integrated into design, development, deployment, and operations.
Security Engineer CACI International IncSecurity EngineerCollege Park, MD$86,600–$181,800 / yearPay Range: There are a host of factors that can influence final salary including, but not limited to, geographic location, Federal Government contract labor categories and contract wage rates, relevant prior work experience, specific skills and competencies, education, and certifications. • Implement and manage security technologies including firewalls, intrusion detection/prevention systems (IDS/IPS), endpoint protection, and security information and event management (SIEM) tools.
System Security Engineer (Engineering, Analyst) The Mil CorpSystem Security Engineer (Engineering, Analyst)Lexington Park, MD$70,000–$104,000 / yearThe MIL Corporation provides a full range of engineering services including cyber resiliency engineering, vulnerability research, software and hardware penetration testing, reverse engineering, support of the NAVAIR Red Team, as well as other System Security Engineering (SSE) support to Naval Aviation acquisition programs. Analyzes designs, develops, implements, tests, or evaluates software, components, or systems related to engineering or functional requirements of military weapons systems, associated support systems, or management information systems.
Senior Offensive Security Engineer HuntressSenior Offensive Security EngineerColumbia, MDRemoteAnalyze and exploit vulnerabilities through detailed operational logging, leveraging strong documentation and communication skills to translate complex technical findings into actionable remediation guidance that directly hardens the organization's security. Utilize a mix of traditional scripting and generative AI platforms to rapidly prototype tools, replicate sophisticated cyber threats, and automate repetitive workflows during live engagements.
Senior Application Security Engineer Software Guidance & AssistanceSenior Application Security EngineerRockville, MD$87–$90 / hourThis role involves in evaluating security vulnerabilities, security tools, implementing security solutions, and leveraging latest solutions to secure code review capabilities. The main function of senior application security engineer is to plan, coordinate and implement application security practices in each phase of software development life cycle though testing, remediation support, tool evaluation, etc.
Lead Security Engineer Onyx Government Services,LLCLead Security EngineerSuitland, MDFull timeIn support of our various efforts, we have developed the Onyx Data Management Toolkit, a combination of Agile Development principles, COTS Integration, and custom software, to deliver flexible, cost-effective solutions to a variety of Department of Defense, Intelligence Community, and Law Enforcement agencies. We are seeking a Subject Matter Expert (SME)–level Lead Security Engineer to lead application security across a large-scale, cloud-native federal modernization program supporting the U.S. Census Bureau’s Decennial Transformation and Application Modernization (DTAM) effort.
Sr. ISSE with TS/SCI Polygraph Leidos Holdings IncSr. ISSE with TS/SCI PolygraphMD$131,300–$237,350 / yearOur team of security engineers support enhancements to system security architecture and cyber security capabilities; manage multiple system security plans for development, test and production systems following the Risk Management Framework (RMF); manage cross domain capabilities; and support Security Verification Testing (SVT) of relevant Type 1 devices. The strongest candidates will have experience working in these areas: Validating and verifying system security requirements and establishing system security designs for large-scale systems, major system elements, and interfacing systems that are part of a large complex network environment with geographically distributed components.
Senior Application Security Engineer SGA Inc.Senior Application Security EngineerRockville, MDThis role involves in evaluating security vulnerabilities, security tools, implementing security solutions, and leveraging latest solutions to secure code review capabilities. The main function of senior application security engineer is to plan, coordinate and implement application security practices in each phase of software development life cycle though testing, remediation support, tool evaluation, etc.
Senior Systems Security Engineer (Security Engineering, Senior Associate) The Mil CorpSenior Systems Security Engineer (Security Engineering, Senior Associate)Lexington Park, MD$170,000–$210,000 / yearThe MIL Corporation provides a full range of engineering services including cyber resiliency engineering, vulnerability research, software and hardware penetration testing, reverse engineering, support of the NAVAIR Red Team, as well as other System Security Engineering (SSE) support to Naval Aviation acquisition programs. The MIL Corporationseeks aSeniorSystems Security Engineer (Security Engineering, Senior Associate)that will support our Naval Aviation acquisition programs, which has an exciting opportunitysupporting a major ACAT developmental program.
AWS Security Engineer Angarai International, Inc.AWS Security EngineerCollege Park, MD3+ years of hands-on AWS security engineering experience with in-depth knowledge of: IAM VPC security KMS GuardDuty CloudTrail Security Hub S3 security controls AWS Security Specialty or AWS Solutions Architect certifications (preferred). Overview We are seeking an experienced AWS Security Engineer to ensure the security, integrity and compliance of cloud infrastructure and applications hosted on Amazon Web Services (AWS).
Senior Information Security Engineer Offensive Security Verite Group, Inc.Senior Information Security Engineer Offensive SecurityMaryland, MDSeeking experienced offensive security professionals to conduct security assessments, red team operations, and network exploitation activities in support of client security requirements. Bachelor Degree in Computer Science or related field is required or 5 years of direct work experience.
Security Engineer III, Exploitation Analyst / Incident Responder (TS Clearance) Deloitte Touche Tohmatsu LtdSecurity Engineer III, Exploitation Analyst / Incident Responder (TS Clearance)MD$102,500–$188,900 / yearExperience with network traffic analysis, log analysis, digital forensics, Windows, Linux, macOS, common network protocols, scripting languages such as Python, PowerShell, or Bash, and security monitoring tools such as security information and event management (SIEM), intrusion detection systems (IDS), intrusion prevention systems (IPS), or endpoint detection and response (EDR). The wage range for this role takes into account the wide range of factors that are considered in making compensation decisions including but not limited to skill sets; experience and training; licensure and certifications; and other business and organizational needs.
Security Engineer Booz Allen HamiltonSecurity EngineerAnnapolis Junction, MarylandOnsite: If this position is listed as onsite, work will primarily be performed at a Booz Allen office or customer facility, where employees will collaborate directly with colleagues and customers as required by the role. Experience building or fine-tuning ML models outside Elastic, including Python, scikit-learn, and PyTorch, for security use cases such as threat detection or lateral movement scoring.
Principal Test Engineer GliaCell TechnologiesPrincipal Test EngineerAnnapolis Junction, MarylandWe also provide customer solutions in the areas of CND, CNE, and CNO by providing our customers with assessments and solutions in Threat Mitigation, Vulnerability Exposure, Penetration Testing, Threat Hunting, and Preventing Advanced Persistent Threat. Bachelor’s degree in System Engineering, Computer Science, Information Systems, Engineering Science, Engineering Management, or related discipline from an accredited college or university is required.
Advanced Security Engineer, Enterprise Security Relativity ODA LLCAdvanced Security Engineer, Enterprise SecurityMaryland, MD$104,000–$156,000 / yearRole Responsibilities: • Design, implement, and operate endpoint security controls across laptops and mobile devices • Build automation and tooling to enforce secure configuration baselines and reduce manual effort • Partner with IT on device management, deployment, and lifecycle security • Reduce enterprise risk by hardening devices, limiting standing privilege, and improving visibility • Participate in incident response and endpoint‑related investigations in partnership with Cyber teams • Continuously improve endpoint security posture using metrics, telemetry, and risk insights. Required Skills: • Endpoint Security • Network Security • Penetration Testing • Security Architecture Design • Security Automation • Security Information • Security Information and Event Management (SIEM) • Security Operations • Threat Modeling • Vulnerability Management.