Cubic Security Engineer interview questions & guide 2026

The interview process at Cubic is designed to evaluate both your technical competence and your collaborative problem-solving style. The questions outlined below are compiled from real interview experiences of candidates who have gone through the Security Engineer loop. Use these categories to guide your technical study and scenario preparation.

Network Security & Perimeter Defense

This category focuses on your hands-on knowledge of network protocols, traffic management, and perimeter controls. You must demonstrate a clear understanding of how data moves securely across networks.

• Explain the difference between standard and extended Access Control Lists (ACLs).
• How would you configure a Network Address Translation (NAT) gateway to allow secure outbound traffic while blocking unsolicited inbound requests?

Preparing for an interview at Cubic requires a balanced approach. You must demonstrate deep technical proficiency while also showing that you are a pragmatic, collaborative team player who understands the operational realities of a large enterprise.

Technical Fundamentals – You must have a strong grasp of foundational networking and security concepts. Be ready to write out commands, explain protocols, and detail how traffic flows through security appliances. Brush up on firewalls, routing, and access control mechanisms.

Pragmatic Problem-Solving – Interviewers want to see how you approach real-world constraints. At Cubic, security solutions must be reliable, compliant, and scalable. Focus on explaining why you choose a particular approach, taking into cost, complexity, and operational impact.

Clear Communication – Since you will be interviewing with cross-functional panels, you must be able to translate technical security risks into business impacts. Practice structuring your answers using the STAR method (Situation, Task, Action, Result) to keep your behavioral responses concise and impactful.

The interview loop for a Security Engineer at Cubic is structured to be smooth, friendly, and highly collaborative. Candidates consistently report a relaxed and conversational atmosphere, where interviewers are genuinely interested in understanding your background rather than trying to trip you up with trick questions.

The process typically begins with a resume review and a follow-up phone interview with a recruiter or hiring manager. This initial conversation is used to align on basic qualifications, discuss the scope of the role, and introduce you to Cubic's business divisions. Following a successful screen, you will move to a more comprehensive technical and behavioral evaluation.

In many locations, this second stage takes the form of a panel or board interview. You will present to and converse with a small group—typically consisting of a site manager, an IT lead, and an active peer from the security team. This format allows the team to evaluate your technical skills and team fit simultaneously.

The timeline shown above outlines the typical progression from your initial application to the final onboarding steps. Because Cubic handles sensitive government contracts, the post-offer stage includes rigorous background checks and mandatory drug screenings, which are initiated immediately upon accepting an offer.

To succeed in the Cubic hiring process, you must perform well across several distinct evaluation areas. Below is a detailed breakdown of what the engineering panels look for in each domain.

Network & Perimeter Security

This is the most critical technical domain for the Security Engineer role. Interviewers expect you to have hands-on, practical experience with network defense mechanisms.

Be ready to go over:

• Access Control Lists (ACLs) – Understand standard vs. extended ACLs, placement rules (source vs. destination), and the commands used to apply and modify them.

As a Security Engineer at Cubic, your day-to-day work will span both tactical defense configurations and strategic security planning. You will be embedded within engineering or IT operations teams, acting as the primary line of defense for critical systems.

Your primary responsibilities will include:

• Designing, deploying, and maintaining security controls across enterprise networks, cloud environments, and specialized tactical hardware.
• Configuring and managing firewalls, intrusion detection systems, and network access controls (ACLs) to block unauthorized access.
• Conducting regular security assessments, vulnerability scans, and code reviews to identify and mitigate risks before they can be exploited.
• Collaborating with site managers, IT leads, and system administrators to ensure all systems comply with internal security policies and external government regulations.
• Participating in incident response activities, performing root-cause analysis, and implementing preventative measures following any security events.
• Preparing documentation and technical evidence for security audits, compliance reviews, and government clearance validations.

To be competitive for the Security Engineer position at Cubic, you should possess a strong blend of technical expertise, regulatory knowledge, and interpersonal skills.

• Must-have technical skills – Strong proficiency in network security concepts, including firewalls, NAT, ACLs, and VPNs. Experience with enterprise-grade network hardware and security appliances is essential.
• Must-have compliance knowledge – A solid understanding of security frameworks and compliance standards relevant to government contracting (e.g., NIST SP 800-53, ISO 27001, or PCI-DSS).
• Nice-to-have skills – Relevant industry certifications such as CISSP, CompTIA Security+, CEH, or CCNP Security. Experience with cloud security (AWS or Azure) and scripting languages (Python, Bash) for automation is a major plus.
• Security Clearance Eligibility – Because of the nature of Cubic's government contract work, candidates must be U.S. citizens (or local equivalents) and be fully eligible to obtain and maintain a security clearance.
• Soft skills – Strong verbal and written communication skills, with the ability to confidently present technical security risks and solutions to a multi-disciplinary panel.

Q: How difficult is the Security Engineer interview at Cubic? A: Candidates generally describe the interview as average to easy in terms of raw technical difficulty, provided you have solid foundational knowledge. The atmosphere is relaxed, and the team focuses on practical, real-world scenarios rather than abstract academic puzzles.

Q: What is the panel interview format like? A: The panel typically consists of three members: a site manager, an IT lead, and an active security team member. They will take turns asking questions, ranging from high-level behavioral scenarios to specific, hands-on technical questions about network security.

Q: Are background checks and drug screenings mandatory? A: Yes. Because Cubic is a major defense contractor, a comprehensive background check is required to perform government contract work. Additionally, a mandatory drug screening is conducted as one of the first steps immediately after accepting an offer.

Q: What is the work culture like for Security Engineers? A: The culture is highly collaborative and mission-oriented. Because the systems you protect have real-world impacts on defense and public transit, there is a strong sense of responsibility and pride in the work. The environment is supportive, with an emphasis on team success over individual competition.

• Review the basics: Do not overlook fundamental concepts. Be ready to explain simple security mechanisms, write basic ACL commands, and walk through the mechanics of NAT.
• Understand Cubic's business: Take time to research Cubic's two main divisions: Cubic Transportation Systems and Cubic Mission and Performance Solutions. Knowing which division you are interviewing for will help you tailor your security scenarios.
• Show compliance awareness: Emphasize your understanding of security frameworks and government standards. Demonstrating that you respect and understand compliance will immediately set you apart.

• Be honest about your experience: If you do not know the answer to a specific technical question, admit it and explain how you would go about researching the solution. The panel values honesty and resourcefulness over guessed answers.

Securing a role as a Security Engineer at Cubic is a highly rewarding career step. You will have the opportunity to protect critical infrastructure, support national defense initiatives, and solve complex security challenges that have a direct, tangible impact on the physical world.

To maximize your chances of success, focus your preparation on core networking fundamentals, master the configuration of firewalls and access controls, and practice communicating your technical decisions clearly to diverse audiences. By demonstrating both your technical capability and your alignment with Cubic's collaborative, mission-driven culture, you will stand out as an exceptional candidate.

The compensation data above reflects the competitive market rates for this role. Use this information to guide your expectations and conversations with recruiters. To explore deeper insights, review real interview questions, and access additional preparation resources, continue your journey on Dataford. Good luck with your preparation—you are well on your way to a successful interview experience at Cubic!