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Senior Security Engineer Jobs in O Fallon, IL (NOW HIRING)

The Timberline Group

Sr Security Engineer

Saint Louis, MO · On-site +1

$111K - $152K/yr

* The Cyber Security Audit Engineer will manage a variety of technical security auditing capabilities, including a holistic auditing approach of applications, databases, servers, networking devices ...

Stellar IT Group

Application Security Engineer

Saint Louis, MO · On-site

$57 - $76.25/hr

Application Security Engineer (Senior AppSec) Location: Remote Duration: 6-12+ Months Contract Role Overview We are seeking experienced Senior Application Security Engineers to join our team and play ...

Armaninollp

Senior Cloud & Security Engineer

Saint Louis, MO · Hybrid

$111K - $152K/yr

Establish engineering standards for identity, networking, monitoring, resiliency, backup, and operational support * Partner with architecture, infrastructure, networking, and security teams to ...

Boeing

Senior DevSecOps Engineer

Berkeley, MO · On-site

$107K - $147K/yr

This position will focus on supporting the Boeing Defense, Space & Security (BDS) Software Engineering organization. The Mission Systems Senior DevSecOps Engineer will be responsible for establishing ...

Boeing

Senior DevSecOps Engineer

Berkeley, MO · On-site

$107K - $147K/yr

This position will focus on supporting the Boeing Defense, Space & Security (BDS) Software Engineering organization. The Mission Systems Senior DevSecOps Engineer will be responsible for establishing ...

ECS

Sr Security Analyst

Scott Air Force Base, IL · On-site

$92K - $121K/yr

ECS is seeking a Senior Security Analyst to work in our Scott AFB, IL office. As a leading managed ... Threat Detection Engineering (Analyst-led): Implement and improve log-based and endpoint-based ...

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All JobsSecurity Engineer JobsSenior Security Engineer JobsSenior Security Engineer Jobs in O'Fallon, IL

Senior Security Engineer information

See O Fallon, IL salary details

$68.6K

$127.9K

$174K

How much do senior security engineer jobs pay per year?

As of Aug 18, 2026, the average yearly pay for senior security engineer in O'Fallon, IL is $127,916.00, according to ZipRecruiter salary data. Most workers in this role earn between $106,800.00 and $146,400.00 per year, depending on experience, location, and employer.

What skills and qualifications are needed to be a senior security engineer?

To thrive as a Senior Security Engineer, you need deep expertise in network security, risk assessment, incident response, and a relevant degree or equivalent experience. Familiarity with security tools such as SIEM platforms, firewalls, IDS/IPS, and certifications like CISSP or CEH are typically required. Strong analytical thinking, effective communication, and leadership abilities help you excel in complex security environments. These skills and qualifications are crucial to safeguard organizational assets and maintain robust defense against evolving cyber threats.

How does a senior security engineer collaborate with other departments to enhance organizational security?

Senior Security Engineers frequently work cross-functionally, partnering with IT, software development, and compliance teams to implement security best practices and respond to incidents. They play a key role in conducting security reviews, advising on secure design, and leading incident response efforts. Effective communication and collaboration are essential, as these engineers often translate technical risks into business terms and provide guidance during audits or vulnerability assessments. This collaborative approach helps ensure comprehensive protection across all organizational assets.

What is the difference between Senior Security Engineer vs Security Analyst?

AspectSenior Security EngineerSecurity Analyst
Required CredentialsCertifications like CISSP, CISA, CEH; Bachelor's or Master's in Cybersecurity or related fieldsCertifications like CompTIA Security+, GIAC Security Essentials; Bachelor's in Cybersecurity, Information Technology, or related fields
Work EnvironmentDesigning security systems, implementing security measures, leading security projectsMonitoring security alerts, analyzing threats, conducting security assessments
Employer & Industry UsageUsed in tech companies, finance, healthcare for security infrastructure rolesCommon in various industries for threat detection and incident response

The main difference is that Senior Security Engineers focus on designing and implementing security solutions, while Security Analysts primarily monitor and analyze security threats. Both roles require relevant certifications and work in similar environments, but their responsibilities differ in scope and focus.

What cities near O'Fallon, IL are hiring for Senior Security Engineer jobs?

Cities near O'Fallon, IL with the most Senior Security Engineer job openings:

Senior Security Engineer jobs near you
Infographic showing various Senior Security Engineer job openings in O'Fallon, IL as of August 2026, with employment types broken down into 89% Full Time, 9% Part Time, and 2% Contract. Highlights an 92% Physical, 3% Hybrid, and 5% Remote job distribution, with an average salary of $127,916 per year, or $61.5 per hour.

Sr Security Engineer

The Timberline Group

Saint Louis, MO • On-site, Remote

$111K - $152K/yr

Full-time

Re-posted 25 days ago

Job description

  • The Cyber Security Audit Engineer will manage a variety of technical security auditing capabilities, including a holistic auditing approach of applications, databases, servers, networking devices, and software. Responsible for demonstrating skills in assessing IT process and technology risks, identifying and evaluating the design of IT controls, designing, executing and documenting IT audit tests, and making initial determination of reportable issues. Assist with HIPAA / HITECH assessments, and data breach preparedness. Will work in close coordination with team members and other business owner's partners to carry our customer requirements.
    Job Description:
    ROLES and RESPONSIBILITIES:
    • Design, build, implement and monitor a holistic audit program across the enterprise.
    • Develop understanding of appropriate business aspects, IT risks, IT control requirements, processes and systems under review.
    • Perform process and technology risk analysis with a cybersecurity mindset and focus, prepare process maps and flowcharts, prepare effective and efficient compliance and substantive technical approach; and execute in depth IT audit review.
    • Perform assessment of IT process and security controls within information systems environment.
    • Evaluate test results: accurately identify symptoms, root cause, problems, identify alternative controls and develop recommendations.
    • Perform audit reviews of technology such as applications, databases, servers, networking devices (i.e., firewalls and routers), and security tools such as IDS/IPS, anti-malware, and authentication systems (e.g., Active Directory).
    • Performing technology assessments in a wide variety of business environments, including:
    • Information Technology Operational and Cyber Security Assessments in accordance with industry frameworks, such as COBIT 5, ISO 27001, ISO 27005, and NIST SP 800-30 and Cybersecurity Framework
    • HIPAA Security Rule and HITECH Act Compliance
    • Cloud Security Compliance
    • Assisting clients with the performance of Business Impact Analyses (BIAs) along with the development of business continuity and disaster recovery plans (BCPs and DRPs);
    • Assisting organizations with all aspects of data breach and information security Incident Response preparation and management
    • Performing Service Organization Control Examinations in accordance with AICPA requirements (SOC 1 SSAE 16, SOC 2 AT 101, SOC 3 AT 101)
    • Providing data classification services
    • Developing information technology and security policies and procedures
    • Providing trusted advisory services and guidance to clients that will reduce organizational risk and improve their overall cyber security posture
    • Preparing reports and other deliverables that contain strategy, technical analysis, and findings in connection with our advisory and assessment engagements and communicating those results to client management
    • Excellent technical and interpersonal skills required.
    • Experience with Qualys / Nessus Vulnerability scanning tools.
    • Cloud Experience a plus

    EXPERIENCE, QUALIFICATION AND EDUCATION
    • Minimum of 5 of experience with Enterprise Network, DMZ, and Security infrastructure, including design, implementation, and ongoing management and troubleshooting required.
    • Minimum of 5 years' experience in designing, developing, implementing, and managing solutions across cybersecurity domains (Cyber Defense, Threat and Vulnerability Management. Advanced Security Analytics, Data Security, Identity Management, Security Operations and Managed Security Services etc.)
    • Three years or more of professional experience or job-related experience in Information Security, or Information Technology
    • Extensive knowledge and skill of IT analysis which includes expertise in analyzing confidentiality, integrity, availability of complex IT systems.
    • Familiarity with Secure Software Development practices
    • Hands On experience with various programming languages or scripting languages and tools.
    • Effective oral and written communication skills.
    • Strong interpersonal skills and demonstrable leadership ability.
    • Certifications in one or more of the following: CISSP, CWSP, CCNP, ACE, CCNP Security, Security+, or related.
    • Familiarity with various operating system platforms (Linux, Windows) and databases security best practices for each.
    • Strong analytical and problem-solving ability.
    • Ability to work independently.

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