Demo

Principal Software Engineer

Owl Cyber Defense
Columbia, MD Full Time
POSTED ON 3/27/2026
AVAILABLE BEFORE 4/25/2026
Title: Principal Software Engineer Department: Software Development Reports to: Engineering Manager Office: Columbia, MD Work Location: Hybrid – Columbia, MD, Morrisville, NC or Danbury, CT

Owl Cyber Defense is a leader and trusted partner in cyber security. We deliver solutions that protect and connect the world’s most critical networks. Owl’s product lines of cross domain, data diode, and portable media solutions provide the strongest available security checkpoints for threat prevention and secure data availability. Our in-depth expertise in security engineering at the operating system level enables us to help government and commercial customers meet ever-evolving cyber security threats.

Job Summary

In this Software Engineering role, you will be responsible for investigating, enhancing, designing, developing, and testing Linux based security systems. You will work on multiple projects identifying and resolving complex security issues. Projects involve deep security vulnerabilities that target the operating system level. This is an opportunity to deepen your operating system security knowledge with a recognized leader in the industry. You will learn SELinux and other security processes to harden complex systems. This opportunity will allow you to be part of a strong technical team with a high degree of autonomy and significant responsibility. Candidates with Cobal and Fortran experience are highly desired.

This position supports hybrid work. Must be located within reasonable driving distance of an office (Columbia, MD, Morrisville, NC or Danbury, CT, and willing to periodically travel to office.)

Requirements/Qualifications

  • Education
    • Bachelor’s degree or higher in Computer Science, Engineering or Mathematics
  • Experience
    • 15 years software development
    • 3 years in technical leadership or team lead capacity
  • Required Knowledge, Skills & Abilities
    • Advanced proficiency in one or more of the following: Rust, Java, C, or C
    • Understanding of Linux/Unix kernel-level functionality
    • Strong automated testing and quality assurance practices
    • Proven ability to mentor developers and foster collaborative team culture
    • Git version control and collaborative development workflows
    • Excellent written and verbal communication skills
    • Deep understanding of software architecture and design patterns
    • Familiarity with RHEL and systemd
    • Understanding of networking and standard protocols: UDP, TCP, FTP
  • Preferred Knowledge, Skills & Abilities
    • SELinux policy development and hardened operating systems
    • Extensive experience with XML and related technologies (XSD, XSLT, XProc, XML Digital Signature)
    • Common Criteria or government certification processes
    • DFDL
    • Structured data types: MIL-STD-6016, USMTF, VMF
    • Defense, Intelligence, or critical infrastructure experience
    • Experience with Agile development methodologies
  • Additional Competencies/Requirements
    • Candidate must be able to obtain/maintain an active US Government security clearance
About Owl Cyber Defense Solutions, LLC

Owl Cyber Defense Solutions, LLC is a fast-growing cybersecurity solutions company, holding a firm leadership position in network security and secure information transfer. It is a privately-owned US company with offices in Columbia, MD, Danbury, CT and Morrisville, NC. For more information, see http://www.owlcyberdefense.com.

Owl Cyber Defense is Proud to be an Equal Opportunity /Affirmative Action Employer.

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