Defensive Cyber Software Developer

Leidos is hiring a Defensive Cyber Software Developer for its Leidos Cyber Electromagnetic Activity (CEMA) team in Lawton, OK. In this full-time role, you will develop software capabilities that help defend against cyber, EW, and PNT threats to US weapon systems, while supporting customer alerting for potential attacks. The position is onsite and requires TS/SCI clearance eligibility.

You will focus on building and refining defensive techniques for tactical environments, combining research, development, and collaboration with internal experts to deliver quality, high-performance solutions.

Responsibilities

• Develop software and/or techniques for protecting data and networks on tactical systems, including detection, identification, and potential response to attacks.
• Research and develop signature-based and behavior-based defensive techniques targeting adversarial attacks on tactical networks.
• Work with a development team to produce performant solutions, coordinating with internal experts and applying deep analysis to understand impact on end-product or solution.

Requirements

• Bachelor’s Degree in computer science, computer engineering, cyber engineering, or a similar ABET-accredited program.
• 2+ years of professional development in C, C++, Rust, Go, or similar compiled languages.
• 2+ years of experience (professional or not) with Python and various scripting languages.
• Comfortable daily use experience with Linux.
• Experience using version control tools.
• Familiarity with an iterative software design process such as Agile and/or Continuous Delivery, including common tooling like Jira and Jenkins.
• Strong understanding of networking, including protocols across the stack and network architecture.
• Knowledge of general software development best practices.
• US Citizenship and ability to obtain and maintain a TS/SCI security clearance.
• Ability to travel to customer sites up to 20% of the time.

Technologies

• C, C++, Rust, Go
• Python
• Linux
• Agile
• Continuous Delivery
• Jira, Jenkins
• Wireshark

Benefits

• Paid Time Off
• 11 paid Holidays
• 401K with a 6% company match and immediate vesting
• Flexible Schedules
• Discounted Stock Purchase Plans
• Technical Upskilling
• Education and Training Support
• Parental Paid Leave
• Competitive benefits
• Health and Wellness programs
• Income Protection
• Paid Leave and Retirement

Preferred Qualifications

• Experience using Wireshark.
• Firm understanding of cybersecurity.
• Basic understanding of UI/UX principles and familiarity with web development.
• Certifications such as Network+, Security+, CySA+, Linux+.

Compensation: USD 69,550 - 125,725 per yearly.

Original posting date: October 6, 2026.

U.S. positions: While subject to change based on business needs, Leidos reasonably anticipates the job requisition will remain open for at least 3 days from the original posting date, with an anticipated close date no earlier than 3 days after the original posting date listed above.