Defensive Cyber Software Developer

Leidos has a new and exciting opportunity for a Defensive Cyber Software Developer in our INTEL Sector's Cyber & Analytics Business Area (CABA) . Our talented team is at the forefront in Security Engineering, Computer Network Operations (CNO), Mission Software, Analytical Methods and Modeling, Signals Intelligence (SIGINT), and Cryptographic Key Management. At Leidos , we offer competitive benefits , including 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, and much more. Join us and make a difference in National Security!

The Defensive Cyber Software Developer will work with a diverse, highly skilled team to develop unique solutions for Cyber, EW, and PNT threats against US weapon systems. Our products are responsible for alerting our varied array of customers of potential cyber and EW attacks by creative Adversaries highly skilled at attacking. With that problem set in mind, our products need to be developed by equally creative minds that enjoy digging, researching, programming, questioning, and generally learning all they can do to do those exact things the Adversaries would.

This is a full-time position with the Leidos Cyber Electromagnetic Activity (CEMA) team that is based in Lawton, OK, and will require the candidate to be able to obtain and maintain a TS/SCI security clearance.

Primary Responsibilities:

Developing software and/or techniques in the protection of data and networks on tactical systems as well as detection of, identification of and potential response to attacks.

Researching and developing signature and behavior-based defensive techniques against adversarial attacks on tactical networks.

Working with a development team to provide quality performant solutions that require collaboration with internal experts, deep analyses and understanding of impact on end-product/solution.

Basic Qualifications:

Bachelor’s Degree in computer science, computer engineering, cyber engineering or similar degree from an ABET-accredited program

Minimum 2+ years of professional development in C, C++, Rust, Go, or similar compiled languages

Minimum 2+ years of experience (professional or not) with Python and various scripting languages.

Experience using Linux at a comfortable daily use level

Experience with version control tools

Familiarity with an iterative software design process, such as Agile and/or Continuous Delivery, as well as common tooling associated with the process, such as Jira and Jenkins

A good understanding of networking – protocols at all layers of the networking stack and network architecture.

Knowledge of general software development best practices

Must be a US Citizen and be able to obtain and maintain a TS/SCI security clearance.

Ability to travel to customer sites up to 20% of time

Preferred Qualifications:

Experience using Wireshark

Firm understanding of Cybersecurity

Basic understanding of UI/UX principles along with familiarity of web development

Certifications such as Network+, Security+, CySA+, Linux+

If you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo — because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 — and moving faster than anyone else dares.

Original Posting: October 6, 2026

For 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.

Pay Range: Pay Range $69,550.00 - $125,725.00

The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.