Cyber Security Engineer, Jr.

VulnU; Florham Park, Northern (NJ, KY); Hybrid; USD 61,000 - 122,000; Full time

Benefits offered by this job

Flexible PTO

Learning budget

Job summary

CACI is seeking a Junior Cyber Security Engineer in Florham Park, NJ to design, implement, and remediate technical cyber controls across DoD contractor and commercial environments. The role emphasizes Linux hardening, secure coding, and applying NIST guidelines.

You will work with teams to develop secure designs, perform vulnerability assessments with Nessus and Splunk, and document remediation plans. The ideal candidate has hands-on Python/Flask, shell scripting, and strong communication.

Qualifications

• Hands-on design and implementation of technical cyber controls.
• Linux hardening (RHEL, Alma Linux, Ubuntu) with SELinux and least privilege.
• Secure coding in Python/Flask and threat modeling.
• Experience with NIST SP 800-53/800-171, RMF, CMMC and POA&Ms.
• Familiarity with CIS Benchmarks, DISA STIG, and FIPS 140-2.
• Vulnerability tools: Nessus, Splunk, Elastic, SentinelOne, Wireshark.
• Bash and PowerShell scripting, cron automation.
• Strong documentation and communication skills.

Responsibilities

• Design, develop, and implement technical cyber controls for security applications and infrastructure.
• Harden Linux servers with SELinux, least privilege, and scripting.
• Apply secure coding practices in Python/Flask and manage secrets.
• Assess and remediate controls per NIST SP 800-53/171; track POA&Ms.
• Perform vulnerability assessments and prioritize findings by risk.
• Collaborate with development teams to integrate security requirements.
• Prepare design alternatives, deployment plans, and testing approaches.

Skills

Technical cyber controls design

Linux hardening

Secure coding in Python/Flask

NIST standards familiarity

Documentation skills

Tools

Tenable Nessus

Splunk

Elastic

SentinelOne

Wireshark

Kali Linux

Bash scripting

PowerShell

Job description

# Cyber Security Engineer, Jr.CACI · caci.comCategory: Security EngineeringLocation: Florham Park, NJ, USLevel: JuniorSalary: $61,100 – $122,200Clearance: Top Secret## Quality of lifeWhat the posting states. Hover or tap a perk to see the line it came from.* Flexible PTO* Learning budgetJob Title: Cyber Security Engineer, Jr.Job Category: Information TechnologyTime Type: Full timeMinimum Clearance Required to Start: Top SecretEmployee Type: RegularPercentage of Travel Required: Up to 10%Type of Travel: Local\\* \\* \\*The Opportunity:CST is seeking a skilled Cybersecurity Engineer with hands-on experience in designing, implementing, and remediating technical cyber controls across DoD contractor and commercial environments. The ideal candidate will demonstrate expertise in Linux hardening, secure coding, and compliance with NIST standards, as well as strong documentation and communication skills.Responsibilities:- Design, develop, and implement technical cyber controls for security applications and infrastructure.- Harden Linux servers (RHEL-family, Alma Linux, Ubuntu, Kali) using SELinux, firewalled, least privilege, and shell scripting.- Apply secure coding practices in Python, including input allow listing, secrets management, and constant-time authentication checks.- Prepare design alternatives, deployment requirements, and testing approaches for security applications.- Assess and remediate controls derived from NIST SP 800-53 and NIST SP 800-171; track remediation through POA&Ms.- Conduct vulnerability assessments using Tenable Nessus and prioritize findings by CVSS score and business risk.- Monitor and investigate security alerts across Splunk, Elastic, Lima Charlie, and Sentinel One; escalate confirmed threats.- Author technical documentation, including POA&Ms, design specifications, deployment instructions, and testing plans.- Collaborate with development teams to integrate security controls and requirements into new and existing applications.- Research and configure cyber controls to align with CIS Benchmarks, DISA STIG, and FIPS 140-2 guidelines.Qualifications:Required: - Technical cyber controls design and implementation.- Linux hardening and systems-level configuration tuning.- Secure coding practices in Python and Flask (REST APIs).- Experience with NIST SP 800-53, NIST SP 800-171, NIST RMF, CMMC, POA&Ms, DoD requirements.- Familiarity with CIS Benchmarks, DISA STIG, FIPS 140-2.- Vulnerability assessment tools: Tenable Nessus, Splunk, Elastic, SentinelOne, Wireshark, Kali Linux.- Bash and shell scripting, cron automation, PowerShell.- Strong professional documentation and communication skills.-What You Can Expect: A culture of integrity.At CACI, we place character and innovation at the center of everything we do. As a valued team member, you’ll be part of a high-performing group dedicated to our customer’s missions and driven by a higher purpose – to ensure the safety of our nation.An environment of trust.CACI values the unique contributions that every employee brings to our company and our customers - every day. You’ll have the autonomy to take the time you need through a unique flexible time off benefit and have access to robust learning resources to make your ambitions a reality.A focus on continuous growth.Together, we will advance our nation's most critical missions, build on our lengthy track record of business success, and find opportunities to break new ground — in your career and in our legacy.Pay Range:There are a host of factors that can influence final salary including, but not limited to, geographic location, Federal Government contract labor categories and contract wage rates, relevant prior work experience, specific skills and competencies, education, and certifications. Our employees value the flexibility at CACI that allows them to balance quality work and their personal lives. We offer competitive compensation, benefits and learning and development opportunities. Our broad and competitive mix of benefits options is designed to support and protect employees and their families. At CACI, you will receive comprehensive benefits such as; healthcare, wellness, financial, retirement, family support, continuing education, and time off benefits.The proposed salary range for this position is:$61,100 - $122,200CACI is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, pregnancy, sexual orientation, age, national origin, disability, status as a protected veteran, or any other protected characteristic.