Colorado Springs, Colorado

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Secure our Nation, Ignite your Future

Become an integral part of a diverse team while working at an Industry Leading Organization, where our employees come first.  At ManTech International Corporation, you’ll help protect our national security while working on innovative projects that offer opportunities for advancement.

Currently, ManTech is seeking a motivated, career and customer-oriented Information System Security Engineer, L3-Sr. to join our team in Colorado Springs, CO.

Responsibilities include, but are not limited to:

  • Provide subject matter expertise and capability to consult/troubleshoot security related matters for enterprise information systems and network architectures, system access problems and implementation of security policies and procedures. Ensure security access and protect against the unauthorized access, modification, or destruction of systems or data.  Demonstrate familiarity with a variety of security concepts, practices, and procedures, including the importance of building security requirements and practices into the systems engineering process and the software development lifecycle.  A wide degree of security-relevant creativity and latitude is expected. 
  • Apply solid knowledge of information security principles and practices.  Manage and maintain the security integrity of all IT systems and network architectures.  Ensure systems are securely operated, maintained, and disposed of in accordance with security policies and practices defined by the federal government and outlined in the security plan.   Develop and maintain security plans and associated documentation.  Ensure all system users have the correct authorizations and privileges to perform their jobs, and are aware of their security responsibilities while accessing the system. 
  • Provide training to system users on preferred security practices.  Author risk assessments and support certification and accreditation activities.  Participate in system reviews, to include custom, COTS and GOTS software and hardware, and in-house software development, and provide recommendations for securing the systems and software.
  • Other facets of the IT Security Engineer responsibilities include the following:
    • Provide daily, ongoing security oversight of assigned systems, to include the security impact of proposed modifications, additions, and technology refresh evolutions
    • Advise users of the security features and procedures used in their Information Systems
    • Understand system security vulnerabilities and associated threats, and assess the overall security risks to the system.
    • Provide mitigation recommendations to reduce identified security risks
    • Work directly with internal IT staff and customer to establish and enforce IT security best practices, protection objectives, process improvements and effective IT security controls
    • Perform application, database and system vulnerability scanning using approved software tools
    • Thoroughly understand software installations, systems monitoring and troubleshooting, account management, and overall efforts to minimize system downtime
    • Thoroughly understand the administration of critical server infrastructure, including stand-alone and virtual servers, server backup and recovery, and platforms such as file servers and web servers
  • Provide support to the administration staff for security-relevant applications, such as IDS/IPS and log manager, and associated accounts.  Assist in IT security incident response and documentation.  Perform regularly scheduled security reviews (e.g., technology, operations, and personnel).
  • Participate in all stages of higher headquarters assessments to include Audits of Privileged Accounts, Security Control Assessments, High Value Asset assessments and Penetration tests. 
  • Serve as the primary interface to government compliance and policy teams to ensure the system consistently meets the requirements for certification and accreditation.  Participate in designing and managing IT Security strategy including both infrastructure and applications.  Lead security and compliance-based projects.  Consult with users to determine requirements and provide security solutions to meet needs.  Assist with projects involving database and security issues and requirements.

Basic Qualifications:

Ability to demonstrate technical knowledge of one or more of the below mentioned technologies.

  • Current CISSP certification or equivalent level of certification (CASP+CE, CCNP Security, CISA, CISSP (or Associate), GCED, GCIH, CCSP)
  • Experience as a Security Engineer supporting software architecture development environments
  • Experience on security directives, policies, publications and regulations
  • Experience in creating and maintaining System Security Plans
  • Experience with Disaster Recovery and Contingency planning
  • Experience in IT security certifications (CIPP, CompTIA Security +, CPP, PSP)
  • Possess clear understanding of security protocols and standards and have experience with software and security architectures.
  • Understand how to design and implement security tests in accordance with stated criteria
  • Experience with security practices of Intranet and Extranet
  • Experience with packet analyzers
  • Experience with Linux/UNIX Windows servers
  • Experience understanding protocols, such as, SSL/TLS, CIFS, HTTP/S, DHCP, SMTP, LDAP/S and DNS
  • Experience in networking concepts and services, such as, VPNs, IPSec, PKI and TCP/IP
  • Expertise with the accreditation process, such as Risk Management Framework (RMF), with knowledge of NIST 800.53
  • Bachelor's degree or equivalent in Computer Science, Information Systems Management, Information Technology or other related discipline with 5 or more years related professional experience.  AGILE certification desired.

Preferred Qualifications:

  • 5+ years of experience in IT security field
  • Ability to function as an integral member of the Security Team, demonstrating a desire to share and receive knowledge and mentorship as needed.  
  • Ability to work with minimal supervision and to function as an integral member of the security team.
  • Strong communication skills, both oral and written
  • Organized, responsive and highly thorough problem solver
  • Familiar with security controls of Federal Information Systems
  • Familiar with high-availability (HA) and failover implementations for network infrastructure and server systems
  • Familiar with SAN implementations and server clusters

Security Clearance Requirements:

  • Active DOD Secret clearance and ability to obtain agency suitability clearance

Physical Requirements:

  • The person in this position must be able to remain in a stationary position 50% of the time. Occasionally move about inside the office to access file cabinets, office machinery, or to communicate with co-workers, management, and customers, via email, phone, and or virtual communication, which may involve delivering presentation.
  • This position supports an IT operations environment.  All employees should expect to support work on nights and weekends and may be included in an on-call rotation for after-hours support.

The projected compensation range for this position is $105,000-$175,000. There are differentiating factors that can impact a final salary/hourly rate, including, but not limited to, Contract Wage Determination, relevant work experience, skills and competencies that align to the specified role, geographic location (For Remote Opportunities), education and certifications as well as Federal Government Contract Labor categories. In addition, ManTech invests in it’s employees beyond just compensation. ManTech’s benefits offerings include, dependent upon position, Health Insurance, Life Insurance, Paid Time Off, Holiday Pay, Short Term and Long Term Disability, Retirement and Savings, Learning and Development opportunities, wellness programs as well as other optional benefit elections.

For all positions requiring access to technology/software source code that is subject to export control laws, employment with the company is contingent on either verifying U.S.-person status or obtaining any necessary license. The applicant will be required to answer certain questions for export control purposes, and that information will be reviewed by compliance personnel to ensure compliance with federal law. ManTech may choose not to apply for a license for such individuals whose access to export-controlled technology or software source code may require authorization and may decline to proceed with an applicant on that basis alone.

ManTech International Corporation, as well as its subsidiaries proactively fulfills its role as an equal opportunity employer. We do not discriminate against any employee or applicant for employment because of race, color, sex, religion, age, sexual orientation, gender identity and expression, national origin, marital status, physical or mental disability, status as a Disabled Veteran, Recently Separated Veteran, Active Duty Wartime or Campaign Badge Veteran, Armed Forces Services Medal, or any other characteristic protected by law.

If you require a reasonable accommodation to apply for a position with ManTech through its online applicant system, please contact ManTech's Corporate EEO Department at (703) 218-6000. ManTech is an affirmative action/equal opportunity employer - minorities, females, disabled and protected veterans are urged to apply. ManTech's utilization of any external recruitment or job placement agency is predicated upon its full compliance with our equal opportunity/affirmative action policies. ManTech does not accept resumes from unsolicited recruiting firms. We pay no fees for unsolicited services.

If you are a qualified individual with a disability or a disabled veteran, you have the right to request an accommodation if you are unable or limited in your ability to use or access as a result of your disability. To request an accommodation please click and provide your name and contact information.

Colorado Springs, Colorado

ManTech was founded in 1968 to provide advanced technological services to the United States government. We began with a single contract with the U.S. Navy to develop war-gaming models for the submarine community. Over the years, our government's technology needs have increased dramatically in scope and sophistication, and we have grown to meet that challenge.


For more than 4 decades, we kept a careful eye on where emerging technologies were taking the government, and we developed the resources to master those technologies—by staying close to our customers and anticipating their needs, hiring talented professionals to propel us into the future, and acquiring companies with proven capabilities.


Today, we are a multi-billion-dollar public company that provides the innovation, adaptability, and critical thinking our government needs for success in defense, intelligence, law enforcement, science, administration, health, and other fields—throughout the nation and in many countries throughout the world. We are now applying the lessons learned in the unforgiving arena of national security to help the private sector protect networks and critical information.

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