Software and Systems Engineer

MANTECH seeks a motivated, career-oriented SOFTWARE & SYSTEMS ENGINEER to join our team supporting the Marine Corps in STAFFORD, VA.

This position will ensure our technical initiatives are executed optimally utilizing modern Dev Sec Ops , programming, and Systems Engineering principles as well as strong project management discipline to tackle operational problems by creating viable technical solutions for transition through research, development, testing & evaluation.

• Provide senior-level expertise in the research, design, and deployment of complex hardware/software solutions, leading prototyping initiatives and maintaining comprehensive architecture documentation and runbooks.
• Develop, review, and execute highly detailed engineering artifacts (e.g., SEPs, ICDs) and lead Systems Engineering Technical Review (SETR) milestones from preliminary design through software acceptance.
• Drive the assessment and integration of transformative technical capabilities across ground, air, maritime, and space platforms within both tactical and enterprise information environments.
• Design and execute comprehensive Test and Evaluation Strategies (TES/TEMP), conducting rigorous functional, integration, regression, and performance testing to validate system requirements.
• Define and support rigorous Configuration, Change, and Release Management processes (including Engineering Change Proposals) while leading multi-phase risk management assessments.
• Oversee operational security compliance (DISA STIGs, GPOs, ACAS), perform system monitoring and root-cause analysis, and provide expert Tier 3 troubleshooting for complex Linux-related issues.
• Lead coordination efforts with vendors, technical staff, and cross-functional stakeholders across multiple organizations to ensure the timely and successful delivery of capabilities.

• Master’s degree in engineering, computer engineering, information technology, systems engineering, or a related technical discipline with 12 or more years of experience, OR Bachelor’s Degree with similar discipline and 14 or more years of experience.
• Must hold an active DoD 8570/ DoDi 8140 IAT Level III certification (e.g., CISSP).
• Extensive experience directing technical teams through the entire SDLC for complex enterprise or tactical operational problems, providing hands-on engineering down to the component, subcomponent, and circuit level; proven background supporting the Marine Corps Information Environment Enterprise (or similar DoD environments) while adhering to ISO/IEC/IEEE, Military (MIL-STD), and Federal (FED-STD) standards, and managing lifecycle testing (unit, integration, system, acceptance) with rigorous test standards, scripts, and plans.
• Strong proficiency designing, deploying, hardening, patching, and maintaining RHEL server infrastructures in production environments, with in-depth technical knowledge of SELinux, fapolicy, systemd, firewall configuration, kernel tuning, and performance optimization to troubleshoot complex system and application issues.
• Proven experience leveraging Red Hat Satellite, Ansible, and Automation Platform for configuration management alongside virtualization/containerization (KVM, Podman, Docker, Open Shift), CI/CD pipelines, Git, Dev Ops workflows, and foundational networking (TCP/IP, DNS, DHCP, routing, firewalls, VLANs), combined with hands‑on expertise implementing secure protocols, PKI concepts (CA, CRLs, OCSP, key generation/lifecycle management using OpenSSL and Keytool), and RHEL identity tooling to integrate systems with IdM/FreeIPA, LDAP, Active Directory, and Multi‑Factor Authentication (MFA).
• Self-driven analytical thinker capable of managing priorities in fast-paced environments and delivering technical briefings to senior government organizations (including Officer, Enlisted, and Civilian personnel); highly proficient with the Microsoft Family of Software and Tools (Office, Visio, SharePoint, Project) alongside development/task management capabilities like Jira and Confluence.

• Direct experience engineering systems/software in the R&D phase aligning with Technology Readiness Levels (TRL) 4 through 7; deep understanding of UAF and DoDAF artifacts, Model-Based Systems Engineering (MBSE), and lifecycle management to design secure, scalable, and redundant architectures. INCOSE CSEP/ESEP certification is highly desirable.
• Proven experience utilizing ITIL, ITSM, or similar maturity models within Agile Scaled Environments (SAFe); strong familiarity with Agile software coding principles and possession of professional leadership certifications such as Project Management Professional (PMP), Certified Scrum Master (CSM), or Lean Six Sigma.
• Familiarity with the Marine Corps Operational Test and Evaluation Activity (MCOTEA), including the MCOTEA Operational Test & Evaluation Manual (6th Edition); experience planning Field User Evaluations and Joint Service Exercise events incorporating…