A Security Engineer at Viasat plays a critical role in safeguarding a global communications network that spans satellite systems, ground stations, commercial aviation internet, and secure defense communications. Because Viasat provides high-speed, high-reliability connectivity to commercial, residential, and government clients worldwide, the security of this infrastructure is of paramount importance. As a member of the security team, you will be responsible for protecting complex, distributed systems against sophisticated threats, ensuring that millions of users remain safely connected.

In this role, your impact extends far beyond standard corporate IT security. You will be working on securing cutting-edge satellite technology, cloud-native environments, and massive physical network infrastructures. This unique combination of space-tech, telecommunications, and enterprise software engineering makes the Security Engineer position both intellectually challenging and strategically vital to Viasat's business operations and global reputation.

Candidates who succeed in this position are those who possess a deep curiosity about how things work under the hood, a strong grasp of networking and operating system fundamentals, and a proactive mindset toward identifying and mitigating risks. You will collaborate closely with software developers, network architects, and systems engineers to build security directly into the lifecycle of Viasat's products and services.

The questions you will face during the Viasat hiring process are designed to evaluate your fundamental knowledge of systems, networks, and security practices. While the exact questions will vary depending on your background and the specific team you are interviewing with, they generally focus on core engineering principles rather than obscure trivia.

Networking & Protocols

Because Viasat is a global communications company, a flawless understanding of networking is essential. Expect interviewers to test your knowledge of how data moves across networks and how to secure those pathways.

• Explain the step-by-step process of a TCP three-way handshake and how it can be abused in a DDoS attack.
• What is the difference between TCP and UDP, and in what security scenarios would you prioritize monitoring one over the other?

Preparing for an interview at Viasat requires a balanced approach of reviewing core technical fundamentals and practicing your communication style. You should approach your preparation with the mindset of a builder who understands how to break, analyze, and ultimately secure complex systems.

Networking Fundamentals – You must have a rock-solid understanding of networking protocols, routing, and traffic analysis. Interviewers will expect you to explain how data travels across the internet and how to secure it at every layer of the OSI model.

Linux System Administration – Be ready to discuss how to navigate, configure, and secure Linux environments. You should be comfortable discussing command-line utilities, system logs, permissions, and process management.

Problem-Solving & Threat Modeling – Viasat values engineers who can think critically under pressure. When presented with a scenario, break down the problem systematically, identify potential attack vectors, and propose practical, layered defense strategies.

Cultural Alignment & Collaboration – Security is a highly collaborative function at Viasat. You will need to demonstrate that you can communicate risk effectively to non-security stakeholders and work productively with engineering teams to implement security controls.

The interview process for a Security Engineer at Viasat typically takes around three weeks to complete. The process is designed to evaluate both your technical depth and your cultural fit through a series of progressive conversations and assessments.

The journey begins with an initial phone screen with a recruiter, which focuses on your background, career goals, and basic biographical details. If there is alignment, you will move forward to a technical phone screen with a security engineer. This technical screen is typically a 30-to-45-minute conversation that covers fundamental networking concepts, security protocols, and Linux commands.

Following a successful technical screen, you will be invited to the final round. Depending on the team and location, this may consist of a virtual panel interview with three to four team members, or a comprehensive, all-day on-site interview at one of Viasat's primary offices, such as Carlsbad, CA. During this final stage, you will meet with multiple interviewers individually or in small panels, with each session focusing on a different area of security expertise, system design, or behavioral competencies.

The timeline above illustrates the standard progression from your initial contact to the final decision. Candidates should use this timeline to pace their preparation, ensuring they master foundational concepts before diving into the multi-faceted scenarios presented during the panel and on-site stages.

To succeed in the Viasat interview process, you must perform well across several distinct technical and professional domains. The engineering team evaluates candidates on their practical knowledge and ability to execute.

Networking & Infrastructure Security

This area evaluates your understanding of how data is securely routed, transmitted, and monitored across global networks. Because of Viasat's satellite and telecommunications focus, network security is a core pillar of the engineering organization.

Be ready to go over:

• Routing Protocols and Security – Understanding BGP, OSPF, and how to prevent routing attacks.
• Firewall and IDS/IPS Configuration – How to design network boundaries and analyze traffic anomalies.
• Cryptographic Protocols – Deep understanding of TLS, SSL, and IPsec implementations.
• Advanced concepts (less common) – Satellite link encryption, RF signal jamming mitigation, and software-defined networking (SDN) security.

Example questions or scenarios:

• "How would you design a secure network architecture for a ground station communicating with a satellite payload?"
• "Describe how you would detect and mitigate a rogue DHCP server on an enterprise network."

Linux & Operating System Security

Most of Viasat's infrastructure runs on Linux-based operating systems. You must demonstrate that you can secure these systems, audit them for vulnerabilities, and respond to host-based security incidents.

Be ready to go over:

• Host-Based Hardening – Disabling unnecessary services, configuring firewalls (iptables/nftables), and managing SSH security.
• Log Analysis and Auditing – Using tools like journalctl, syslog, and auditd to track system activity.
• Privilege Management – Configuring sudoers files, managing user groups, and enforcing the principle of least privilege.
• Advanced concepts (less common) – Kernel hardening, SELinux/AppArmor policy creation, and container security (Docker/Kubernetes).

Example questions or scenarios:

• "A Linux server is showing unusually high outbound traffic. Walk me through the exact commands you would run to investigate this."
• "How would you implement a centralized logging architecture for thousands of distributed Linux nodes?"

Threat Modeling & Incident Response

This area assesses your ability to identify potential threats before they manifest and react effectively when a security incident occurs. Interviewers want to see a structured, methodical approach to risk management.

Be ready to go over:

• Threat Modeling Frameworks – Using methodologies like STRIDE or PASTA to analyze applications and infrastructure.
• Incident Response Lifecycle – Understanding the phases of preparation, detection, containment, eradication, recovery, and lessons learned.
• Vulnerability Management – How to prioritize vulnerabilities based on exploitability, impact, and business context.

Example questions or scenarios:

• "Walk me through how you would perform a threat model on a new web application that handles customer billing data."
• "You discover that an employee's credentials have been compromised and used to access internal source code repositories. What are your immediate next steps?"

As a Security Engineer at Viasat, your daily responsibilities will span both proactive engineering and reactive defense. You will work at the intersection of software development, network engineering, and operations to maintain a robust security posture.

You will spend a significant portion of your time designing and implementing security controls across physical, virtual, and cloud-based infrastructures. This includes configuring network security devices, hardening operating systems, and integrating security scanners into continuous integration and continuous deployment (CI/CD) pipelines. You will partner with development teams early in the product lifecycle to ensure that new features and platforms are secure by design.

Additionally, you will participate in security reviews, risk assessments, and threat modeling exercises for critical systems. When security events or anomalies are detected, you will collaborate with the Security Operations Center (SOC) and incident response teams to investigate, contain, and remediate the threats. Your role is highly collaborative, requiring you to translate complex technical risks into actionable mitigation steps for engineering and product teams across the company.