Leidos

Defensive Cyber Software Developer

United States · Work style not stated · Full time

Apply on the employer’s site ↗See how well you match this job

You apply directly with the employer. ROLIVA does not submit applications from this page and is not the employer.

About the role

Description from the employer’s posting. Check the employer’s page for the current version.

EmployerLeidos
LocationUnited States
Work styleWork style not stated
Employment typeFull time
Employer posted7 Oct 2026

Leidos Dynetics is seeking an Entry Level Defensive Cyber Software Developerto 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.

Since those adversaries have such a board scope, our approach to developing detection measures and mitigations need to be as well. This position will grow and shift depending on skill sets gained as well as needs identified, as all the positions in our department do. Initially, we are seeking someone with skills focused primarily on software development for cyber intrusion detection systems.

Show full description

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 Clearance.

Primary Responsibilities

Working with a team to develop 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.
Developing technical solutions that require collaboration with internal experts, deep analysis and understanding of impact on end-product/solution.
Researching toward development of signature and behavior-based defensive techniques against adversarial attacks on tactical networks.

Basic Qualifications

Bachelor’s Degree in computer science, computer engineering, cyber engineering, or similar degree
Experience (professional or not) development in C, C++, Rust, Go, or similar compiled languages
Experience (professional or not) with Python, or scripting languages.
Basic understanding of networking – protocols at all layers of the networking stack and network architecture.
Familiarity in Linux, basic navigation and editing
US Citizenship required
Must be able to obtain and maintain a TS/SCI Clearance
Ability to travel to customer sites up to 20% of time

Preferred Qualifications

Familiarity using Wireshark
Familiarity with basic cybersecurity concepts
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
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 7, 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 $57,850.00 - $104,575.00

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.

See how well you match this job Apply on the employer’s site ↗

Check your resume against this job Free, no sign-up. Nothing you paste is stored.

Staying safe while you apply

Never pay to apply, interview or accept an offer. ROLIVA never asks you for payment to apply to a job.
Apply only through the official “Apply on the employer’s site” button, on the employer’s own site, and check that a recruiter’s email uses that employer’s own domain rather than a free email address.
Be cautious of an offer made with no real interview, or pressure to decide quickly or share financial details early.

Does something look wrong with this listing? Use “Report broken link” in the role details, or read ROLIVA’s full job-safety guidance ↗.

Preparing for this role with ROLIVA

Check the fit.
Compare the requirements with the experience you have confirmed, including gaps.
Prepare honestly.
Build interview stories and application drafts from your own evidence.
Keep track.
Save the role and record your own application status and follow-ups.

Create a free workspace or log in.