1. What is a Embedded Engineer at Viasat?

As an Embedded Engineer at Viasat, you are at the forefront of connecting the world. Viasat is a global communications company that designs and builds satellite networks, secure networking equipment, and commercial aviation connectivity solutions. In this role, you are not just writing code; you are building the critical, resource-constrained software that powers high-speed satellite modems, secure government encryption devices, and advanced ground infrastructure.

The impact of this position is massive. The embedded software you develop directly dictates the reliability, throughput, and security of networks relied upon by commercial airlines, enterprise businesses, and the United States government. Because Viasat operates in both the commercial and defense sectors, your work will often bridge the gap between cutting-edge networking protocols and rigorous, safety-critical security standards.

What makes this role uniquely challenging and interesting is the intersection of scale and constraint. You will be working with high-performance networking data planes, implementing advanced security protocols, and increasingly leveraging modern systems languages like Rust alongside traditional C/C++. Whether you are optimizing packet processing on an embedded Linux system or designing secure boot architectures for defense-grade hardware, you will be solving complex problems that require a deep understanding of both hardware limits and software architecture.

2. Common Interview Questions

While the exact questions will vary based on your interviewers and the specific team, Viasat relies on consistent patterns to evaluate Embedded Engineer candidates. The goal of these questions is to test your fundamental knowledge and see how you apply it to realistic engineering scenarios.

C/C++/Rust & Embedded Concepts

These questions test your mastery of the languages used to build embedded systems and your understanding of hardware-software interactions.

• How do you prevent memory leaks in a long-running embedded C application?
• Explain the concept of ownership and borrowing in Rust. Why is it advantageous for embedded systems?
• What is a race condition, and how do you prevent it in an RTOS environment?
• Walk me through the steps of an interrupt handling routine. What should you avoid doing inside an ISR?
• How do you write a custom device driver for an I2C or SPI peripheral in Embedded Linux?

Networking & Network Security

Given Viasat's focus, you must prove your ability to handle data moving across networks securely and efficiently.

• Can you draw and explain the TCP state transition diagram?
• How would you implement a rate limiter for incoming network traffic on an embedded device?
• Explain how IPsec provides both confidentiality and integrity for network packets.
• What is the difference between a switch and a router at the embedded software level?
• Walk me through the process of a TLS handshake.

System Design & Architecture

These questions evaluate your ability to architect robust systems from the ground up, balancing performance, security, and hardware constraints.

• Design the software architecture for a secure, remotely manageable satellite modem.
• How would you design a logging system for an embedded device that has limited flash memory and cannot lose data during a sudden power loss?
• Design a high-throughput packet processing pipeline for an embedded network appliance.
• How do you architect a system to safely recover from a corrupted firmware update?

3. Getting Ready for Your Interviews

Preparing for an interview at Viasat requires a strategic approach. The hiring teams are looking for engineers who can seamlessly navigate the boundary between hardware and software while maintaining a strong focus on security and network performance.

Here are the key evaluation criteria you should focus on:

Technical Depth and Systems Mastery – This is the core of the Embedded Engineer evaluation at Viasat. Interviewers will assess your fluency in C, C++, or Rust, your understanding of memory management, concurrency, and your ability to interact directly with hardware. You can demonstrate strength here by confidently discussing how you optimize code for CPU and memory-constrained environments.

Networking and Security Fundamentals – Because Viasat is a communications company, embedded roles heavily index on networking. You will be evaluated on your knowledge of OSI layers, TCP/IP, routing, and layer 2/layer 3 protocols. For defense and security-focused teams, demonstrating a strong grasp of cryptography, secure boot processes, and network security protocols will significantly elevate your candidacy.

Problem-Solving in Ambiguous Constraints – Embedded systems rarely have straightforward solutions. Interviewers want to see how you approach debugging complex system-level issues, such as race conditions, memory leaks, or intermittent hardware failures. You demonstrate this by thinking out loud, asking clarifying questions about hardware constraints, and systematically breaking down the problem.

Collaboration and Culture Fit – Viasat values engineers who can work cross-functionally. You will be evaluated on your ability to communicate complex technical concepts to hardware engineers, QA teams, and systems architects. Showing that you are adaptable, safety-conscious, and proactive in a team setting will prove you are a strong cultural fit.

4. Interview Process Overview

The interview process for an Embedded Engineer at Viasat is designed to be rigorous but highly collaborative. Rather than trying to trick you with obscure algorithmic puzzles, the process focuses on practical, real-world engineering challenges that mirror the actual work you will do. You can expect a steady progression from high-level background discussions to deep, system-level technical evaluations.

Typically, the process begins with a recruiter screen to align on your background, clearance eligibility (if applicable), and role expectations. This is followed by a technical phone screen with a hiring manager or senior engineer, which usually involves a mix of embedded trivia, networking concepts, and a lightweight coding exercise. Viasat places a strong emphasis on understanding how you think, so expect these early conversations to be highly interactive.

The final stage is a comprehensive panel interview, which may be conducted virtually or onsite depending on the specific team and location (such as Carlsbad, CA or Linthicum Heights, MD). This panel dives deeply into systems design, low-level coding, hardware-software integration, and behavioral scenarios. The company's interviewing philosophy is heavily data-driven and user-focused; they want to see that you can build secure, resilient software that performs reliably in the field.

This visual timeline outlines the typical stages of the Viasat interview loop, from initial screening through the final technical and behavioral panels. Use this module to pace your preparation, ensuring you allocate enough time to practice both low-level coding and high-level system design before the final rounds. Note that specific stages may vary slightly depending on whether you are interviewing for a commercial or government-focused team.

5. Deep Dive into Evaluation Areas

To succeed in the Viasat interview, you need to demonstrate mastery across several core technical domains. The following areas represent the most critical evaluation points for Embedded Engineer candidates.

Embedded Software and Systems Programming

This area evaluates your foundational ability to write efficient, safe, and performant code for resource-constrained devices. Interviewers want to see that you understand what your code is doing at the machine level. Strong performance means writing clean C, C++, or Rust code while explicitly managing memory and avoiding common pitfalls like buffer overflows or race conditions.

Be ready to go over:

• Memory Management – Pointers, dynamic vs. static allocation, memory fragmentation, and alignment.
• Concurrency and RTOS – Mutexes, semaphores, spinlocks, interrupt service routines (ISRs), and task scheduling.
• Modern Systems Languages – For roles specifying Rust, expect deep dives into ownership, borrowing, lifetimes, and safe concurrency paradigms.
• Advanced concepts (less common) – Cache coherency, compiler optimization flags, and custom linker scripts.

Example questions or scenarios:

• "Implement a thread-safe ring buffer in C or Rust for passing data between an ISR and a background task."
• "Explain the volatile keyword and provide a scenario where omitting it would cause a catastrophic failure."
• "Walk me through how you would debug a system that occasionally hard-faults after running for several days."

Networking and Protocols

Given Viasat's core business, a deep understanding of networking is non-negotiable. You will be evaluated on your ability to implement, debug, and optimize network stacks on embedded devices. A strong candidate can seamlessly traverse the OSI model and explain how packets move from the physical layer up to the application layer.

Be ready to go over:

• L2/L3 Networking – Ethernet, MAC addressing, IP routing, ARP, and VLANs.
• Transport Protocols – The intricacies of TCP (handshakes, windowing, congestion control) versus UDP.
• Socket Programming – Implementing non-blocking sockets, select/poll/epoll, and handling network timeouts.
• Advanced concepts (less common) – Custom satellite communication protocols, DPDK, or hardware offloading.

Example questions or scenarios:

• "Describe exactly what happens at the network level when a device boots up and requests an IP address via DHCP."
• "How would you design an embedded application to handle thousands of concurrent UDP streams efficiently?"
• "Explain how you would implement a reliable data transfer mechanism over a highly lossy satellite link."

Security and Cryptography

For roles focused on Viasat Government or secure networking, this is a critical evaluation area. Interviewers will assess your understanding of how to protect data at rest and in transit. Strong performance involves demonstrating a "security-first" mindset and an understanding of how cryptographic primitives are applied in embedded systems.

Be ready to go over:

• Cryptography Fundamentals – Symmetric vs. asymmetric encryption, hashing (SHA), MACs, and digital signatures.
• Secure Architecture – Secure boot processes, trusted execution environments (TEE), and hardware security modules (HSM).
• Network Security – IPsec, MACsec, TLS/SSL handshakes, and certificate management.
• Advanced concepts (less common) – Side-channel attacks, zero-trust architectures, and FIPS compliance.

Example questions or scenarios:

• "Design a secure over-the-air (OTA) firmware update process for a remote satellite modem."
• "Explain the difference between IPsec and TLS, and discuss when you would use one over the other in an embedded device."
• "How do you ensure that cryptographic keys are securely stored and utilized on a device with physical access vulnerabilities?"

6. Key Responsibilities

As an Embedded Engineer at Viasat, your day-to-day work will revolve around designing, developing, and deploying robust software for complex communication systems. You will be responsible for the entire software lifecycle, from translating high-level product requirements into low-level architectural designs, to writing the actual code, and finally debugging it on target hardware. Your deliverables will directly impact the performance and security of satellite modems, routers, and encryption devices.

Collaboration is a massive part of this role. You will rarely work in isolation. You will partner closely with hardware engineers to bring up new boards, verify schematics, and write device drivers. You will also work alongside systems architects and product managers to ensure that the networking and security features you implement meet stringent commercial or government standards.

Typical projects might include migrating legacy C/C++ networking stacks to memory-safe Rust, implementing high-throughput IP routing features on embedded Linux platforms, or developing secure bootloaders for next-generation defense hardware. You will spend a significant amount of time in the lab, using oscilloscopes, logic analyzers, and network traffic generators to validate your software against real-world physical constraints.

7. Role Requirements & Qualifications

To be a competitive candidate for the Embedded Engineer position at Viasat, you must bring a blend of low-level programming expertise and domain-specific knowledge in networking or security.

• Must-have skills – Expert-level proficiency in C, C++, or Rust. You must have hands-on experience with Embedded Linux or RTOS environments, strong knowledge of TCP/IP networking protocols, and a solid understanding of memory management and concurrent programming.
• Must-have qualifications – For roles within Viasat Government (such as those in Carlsbad or Linthicum Heights), US Citizenship and the ability to obtain and maintain a US Government Security Clearance are strictly required.
• Experience level – Senior roles typically require 5+ years of relevant industry experience in embedded software development, ideally within telecommunications, aerospace, or defense sectors.
• Nice-to-have skills – Experience with Yocto or Buildroot for custom Linux distributions, scripting skills in Python or Bash for testing automation, and familiarity with cryptographic libraries (like OpenSSL or wolfSSL).
• Soft skills – Strong analytical problem-solving abilities, excellent cross-functional communication skills, and the capacity to take ownership of complex, ambiguous technical challenges.

8. Frequently Asked Questions

Q: Do I need an active security clearance to be hired? For most Viasat Government roles, you do not necessarily need an active clearance to be hired, but you must be a US Citizen and eligible to obtain one. The company will often sponsor your clearance process. However, having an active clearance can significantly accelerate your onboarding and make you a highly competitive candidate.

Q: How deeply do I need to know Rust for the Rust-specific roles? If the job title explicitly mentions Rust, you should expect rigorous technical screening on the language. Interviewers will want to see that you understand its unique memory safety guarantees, concurrency models, and how to interface Rust with existing C codebases (FFI) in an embedded context.

Q: What is the culture like for Embedded Engineers at Viasat? The culture is highly collaborative and engineering-driven. Because the products are often mission-critical, there is a strong emphasis on quality, safety, and thorough testing. Engineers are encouraged to take ownership of their systems and are given the autonomy to propose architectural improvements.

Q: How long does the interview process typically take? From the initial recruiter screen to the final offer, the process usually takes between 3 to 5 weeks. Scheduling the final onsite or virtual panel is often the longest step, as it requires coordinating multiple senior engineers and architects.

Q: Are these roles remote, hybrid, or onsite? Embedded roles at Viasat typically require a strong onsite presence, often operating on a hybrid schedule. Because you will need physical access to hardware prototypes, lab equipment, and secure facilities (SCIFs for classified work), expect to be in the office several days a week in locations like Carlsbad, CA or Linthicum Heights, MD.

9. Other General Tips

To maximize your chances of success during the Viasat interview process, keep these practical tips in mind:

• Brush up on bitwise operations: You will almost certainly be asked to manipulate registers, pack/unpack network headers, or parse custom data frames. Be completely comfortable with bitwise AND, OR, XOR, and shifting operations in your language of choice.