Top 258 Network security engineer Jobs in O'fallon, Il

MDA Network Engineer II
Leidos —Scott AFB, IL
- $59,150 - $106,925 a year
- Full-time
- Microsoft Outlook
- Bachelor of Science
- Mid-level
4d
Senior Network Software Engineer
Leidos —Scott AFB, IL
- $87,100 - $157,450 a year
- Full-time
- Bachelor of Science
- Research
- Master's degree
Network Software Engineer
Leidos —Scott AFB, IL
- $69,550 - $125,725 a year
- Full-time
- Research
- Mid-level
- Master's degree
Implementations Network Engineer II
TEKsystems —Scott AFB, IL
- $33 - $38 an hour
- Temporary
- Writing skills
- Mid-level
- 3 years
- Commuter assistance
- Health savings account
11d
Network Engineer IV - Headquarters Network
Edward Jones —St. Louis, MO
- $101,700 - $173,200 a year
- Full-time
- Hybrid work
- 7 years
- Office
- Bachelor's degree
- Profit sharing
- Health savings account
5d
Voice Network Engineer
Abacus Technology Corporation —Scott AFB, IL
- Full-time
- 5 years
- Bachelor's degree
- Senior level
Quick Apply
5d
IT Security Operations Engineer
Certara —St. Louis, MO
- Full-time
- Computer science
- Computer Science
- Mid-level
12d
Security Operations Analyst
CACI —O'Fallon, IL
- $75,200 - $158,100 a year
- Full-time
- Remote
- Computer Science
- Mid-level
- 3 years
- Health insurance
5d
Enterprise Network Engineer (IP)
Innovien Solutions —Scott AFB, IL
- Full-time
- 7 years
- Bachelor of Science
- Bachelor's degree
13d
Network Software Engineer Lead
Leidos —Scott AFB, IL
- $107,900 - $195,050 a year
- Full-time
- 6 years
- Doctoral degree
- Bachelor of Science
Endpoint Security Engineer III
CACI —St. Louis, MO
- $75,200 - $158,100 a year
- Full-time
- Computer Science
- 5 years
- System design
- Health insurance
Transport Network Engineer II
Leidos —Scott AFB, IL
- $59,150 - $106,925 a year
- Full-time
- Bachelor of Science
- System design
- Mid-level
Palo Alto Subject Matter Expert
CACI —St. Louis, MO
- $75,200 - $158,100 a year
- Full-time
- Computer science
- 7 years
- Azure
- Health insurance
Network Engineer III
CACI —St. Louis, MO
- $75,200 - $158,100 a year
- Full-time
- 5 years
- Research
- Bachelor's degree
- Health insurance
Cyber Security Engineer - NSS Tools
CACI —St. Louis, MO
- $75,200 - $158,100 a year
- Full-time
- 7 years
- Computer Science
- Mid-level
- Health insurance
High Speed Guard Engineer
CACI —St. Louis, MO
- $90,300 - $189,600 a year
- Full-time
- 8 years
- Bachelor's degree
- Travel
- Health insurance
Mobile Device Systems Administrator Senior
General Dynamics Information Technology —St. Louis, MO
- $129,813 - $138,000 a year
- System design
- Bachelor's degree
- Experience equivalent to degree accepted
- Paid time off
- 401(k) matching
Network Software Engineer
Leidos —Scott AFB, IL
- $69,550 - $125,725 a year
- Full-time
- Research
- Mid-level
- Master's degree
Implementation Network Engineer
Computer World Services —Scott AFB, IL
- $70,000 - $85,000 a year
- Full-time
- Bachelor of Science
- Mid-level
- Master's degree
Implementations Network Engineer III
Leidos —Scott AFB, IL
- $73,450 - $132,775 a year
- Full-time
- Bachelor of Science
- Master's degree
- Bachelor's degree

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network security engineer jobs near o'fallon, il

MDA Network Engineer II

Leidos -
Scott AFB, IL

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Job Details

Full-time
$59,150 - $106,925 a year
4 days ago

Qualifications

DoD 8570
IAT
IAT Level II

Full Job Description

Description

Our customer is the Defense Information Systems Agency (DISA) and acts as the provider of GIG/Defense Information System Network (DISN) services to its customers, the department of Defense (DoD) and national security organizations. This position directly supports the DISA-provided GIG capabilities and services in the 24x7 DISA Global Operations Center (DGOC).

The Leidos Digital Modernization Sector and Global Solutions Management-Operations II (GSMO-II) have an opening in our Missile Defense Agency (MDA) Operations Support Cell for a Network Engineer at Scott AFB, IL.

Responsibilites

Responsible for performing the following duties:

Execute network operations to include configuration and analysis of customer circuits across optical and electro-optical multiplexers, , Time Division Multiplexing (TDM), routers, and switches.
Perform real-time circuit redesign (alternate routing) to restore customer connectivity during scheduled and unscheduled outages and maintenance actions.
Work directly with supported customers and engineers across other NOCs to ensure maximum network availability to minimize or eliminate mission and operational impact.
Proactively monitor network alarms across platform specific network management tools.
Utilize incident management applications to document all aspects of reported outages/degradations, isolations, escalations, and resolutions during the lifecycle of a service impacting network incident.
Assess, identify and recommend resolutions to various network incidents and/or deficiencies leveraging knowledge in one or more of following: routers, switches, crypto devices, Ciena, CISCO, Juniper, MSPP, DWDM, Optical Switching, SONET/SDH, satellite communications.

Basic Qualifications

Hold DoD-8570 IAT Level 2 baseline certification (Security+ CE or equivalent) prior to start date.
Requires BS degree and 2 – 4 years of prior relevant experience or Masters with less than 2 years of prior relevant experience. (Or equivalent combination of education and/or experience.)
Able to work in a 24x7 shift work environment.
Must have an active DoD Secret security clearance.
Requires working knowledge and understanding of both Transport and IP network topologies.

Preferred Qualifications

Tech control facility or cyber transport experience
Circuit actions experience
Telco NOC, inside or outside plant experience.
Experience with MS Office suite, i.e. Outlook, Excel, Word, Access, PowerPoint, TEAMs.
Experience with one or more of the following: alarm surveillance, fault management, LAN maintenance, performance management.

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:

September 2, 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 $59,150.00 - $106,925.00

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.

About Leidos

Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. Headquartered in Reston, Virginia, with 47,000 global employees, Leidos reported annual revenues of approximately $16.7 billion for the fiscal year ended January 3, 2025. For more information, visit www.Leidos.com.

Pay and Benefits

Pay and benefits are fundamental to any career decision. That's why we craft compensation packages that reflect the importance of the work we do for our customers. Employment benefits include competitive compensation, Health and Wellness programs, Income Protection, Paid Leave and Retirement. More details are available at www.leidos.com/careers/pay-benefits.

Securing Your Data

Beware of fake employment opportunities using Leidos’ name. Leidos will never ask you to provide payment-related information during any part of the employment application process (i.e., ask you for money), nor will Leidos ever advance money as part of the hiring process (i.e., send you a check or money order before doing any work). Further, Leidos will only communicate with you through emails that are generated by the Leidos.com automated system – never from free commercial services (e.g., Gmail, Yahoo, Hotmail) or via WhatsApp, Telegram, etc. If you received an email purporting to be from Leidos that asks for payment-related information or any other personal information (e.g., about you or your previous employer), and you are concerned about its legitimacy, please make us aware immediately by emailing us at [email protected].

If you believe you are the victim of a scam, contact your local law enforcement and report the incident to the U.S. Federal Trade Commission.

Commitment to Non-Discrimination

All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, veteran or military status, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories consistent with relevant laws.

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Refine Your Search

network security engineer jobs in o'fallon, il

MDA Network Engineer II

Senior Network Software Engineer

Network Software Engineer

Implementations Network Engineer II

Network Engineer IV - Headquarters Network

Voice Network Engineer

IT Security Operations Engineer

Security Operations Analyst

Enterprise Network Engineer (IP)

Network Software Engineer Lead

Endpoint Security Engineer III

Transport Network Engineer II

Palo Alto Subject Matter Expert

Network Engineer III

Cyber Security Engineer - NSS Tools

High Speed Guard Engineer

Mobile Device Systems Administrator Senior

Network Software Engineer

Implementation Network Engineer

Implementations Network Engineer III

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