What is a Software Engineer at Astranis?

As a Software Engineer at Astranis, you are building the digital nervous system for the next generation of telecommunications satellites. Your work directly enables our mission to bring reliable, low-cost broadband internet to underserved populations around the globe. This is not a standard software role; the code you write will operate in the harsh environment of space, manage complex network payloads, and control critical satellite functions from thousands of miles away.

The impact of this position spans across multiple domains, from flight software and embedded systems to backend platforms and network operations. You will collaborate closely with mechanical, electrical, and systems engineers to ensure that software and hardware operate in perfect harmony. Whether you are optimizing a state machine for flight operations or building highly available cloud infrastructure to monitor satellite health, your contributions are vital to the success of our deployments.

What makes this role uniquely challenging and rewarding is the scale and the uncompromising need for reliability. You will be solving problems where the cost of failure is astronomical, requiring a deep appreciation for first principles, rigorous testing, and cross-disciplinary engineering. Expect a dynamic environment where your strategic influence will shape how our satellites are operated and maintained for years to come.

Getting Ready for Your Interviews

Preparing for an interview at Astranis requires a blend of deep technical review and strategic communication. We look for candidates who not only write excellent code but also understand the physical systems their software controls.

Technical and Domain Knowledge – You must demonstrate a strong command of computer science fundamentals, system architecture, and, depending on your specialty, hardware-software integration. Interviewers will evaluate your ability to write clean code, design robust state machines, and apply engineering first principles to complex, real-world problems.

Problem-Solving and Adaptability – We assess how you navigate ambiguity and structure your thoughts under pressure. You will be evaluated on your ability to break down a problem, articulate your assumptions, and pivot when presented with new constraints or follow-up questions from the interviewer.

Cross-Functional Communication – At Astranis, software does not exist in a vacuum. Interviewers look for your ability to explain complex software concepts to non-software engineers and your willingness to understand mechanical or electrical constraints. Defending your design choices while remaining open to feedback is critical here.

Execution and Culture Fit – We value engineers who are proactive, curious, and deeply invested in their work. You can demonstrate this by speaking passionately about past projects, showing a bias for action, and proving that you can deliver high-quality results in a fast-paced, highly technical environment.

Interview Process Overview

The interview process for a Software Engineer at Astranis is designed to be rigorous, practical, and highly interactive. It typically begins with a recruiter screen to align on your background and the specific team you are targeting, followed by a 30-to-45-minute initial technical screen via Google Meet. This early round is often conducted by a team member and balances casual conversation about your past projects with immediate, deep-dive technical questions. You will likely use a platform like Coderbyte or a physical whiteboard to demonstrate your problem-solving process.

As you progress to the onsite or final rounds, expect a series of deeply technical interviews. These sessions will push the boundaries of your knowledge, testing everything from software state machines to cross-disciplinary first principles. Interviewers at Astranis are known to be highly engaged; they will interrupt you with follow-up questions, ask you to extend your code to handle new edge cases, and challenge you to defend your technical decisions in real-time.

Our interviewing philosophy heavily emphasizes practical engineering over abstract puzzles. We want to see how you think on your feet, how you handle direct feedback, and whether you possess the foundational knowledge necessary to build software for complex aerospace systems.

The timeline above outlines the typical progression from the initial recruiter screen through the final technical rounds. Use this visual to pace your preparation, ensuring you are ready for both the rapid-fire technical screens and the endurance required for the deeper, multi-round onsite stages. Note that the exact flow may vary slightly depending on whether you are interviewing for Flight Software, Backend, or Network Operations.

Deep Dive into Evaluation Areas

Software Fundamentals and Coding

At the core of the Software Engineer role is your ability to write reliable, scalable, and maintainable code. Interviewers will test your fluency in your primary programming language and your ability to translate logical requirements into working solutions. Strong performance here means writing code that is not only correct but also accounts for edge cases and future extensibility.

Be ready to go over:

• State Machines – Designing and implementing robust state machines is a frequent requirement, especially for flight and embedded software.
• Code Extension – Starting with a basic solution and dynamically adapting it as the interviewer adds new requirements or constraints.
• Algorithm Optimization – Analyzing the time and space complexity of your solution and optimizing it for performance-critical environments.
• Advanced concepts (less common) – Real-time operating systems (RTOS) concepts, memory management in constrained environments, and concurrent programming.

Example questions or scenarios:

• "Implement a state machine to handle the deployment sequence of a satellite component."
• "Write a script to parse incoming telemetry data, and then extend your code to handle corrupted packets."
• "How would you optimize this function to ensure it runs within a strict millisecond deadline?"

Hardware-Software Integration and First Principles

Because Astranis builds physical spacecraft, our software engineers often need to understand the hardware their code interacts with. Depending on your specific sub-team, you may face questions that blend software engineering with electrical or physical principles. A strong candidate does not need to be a mechanical engineer but must demonstrate an intuition for physical constraints and hardware interfaces.

Be ready to go over:

• Communication Protocols – Deep understanding of low-level protocols like I2C, SPI, or UART.
• Circuit Behavior – Basic knowledge of how capacitors filter voltage ripples or how operational amplifiers function.
• Physical Constraints – Applying first principles to solve problems, such as estimating the temperature of a solar panel or understanding signal degradation.
• Advanced concepts (less common) – Radiation effects on memory, structural bending moments, or thermal dissipation in a vacuum.

Example questions or scenarios:

• "Walk me through the I2C circuit behavior when communicating with a temperature sensor."
• "How would you calculate the expected temperature of a solar panel on a satellite in low earth orbit?"
• "What outputs can you expect at a specific test point in this operational amplifier circuit?"

Project Deep Dive and Technical Communication

We care deeply about what you have built in the past. Interviewers will often ask you to discuss your most impressive project in granular detail. Strong performance in this area requires articulating the business or technical problem, explaining your specific contributions, and defending the architectural trade-offs you made.

Be ready to go over:

• Architectural Decisions – Why you chose a specific technology stack or design pattern over alternatives.
• Overcoming Roadblocks – How you debugged a critical failure or navigated a major technical pivot.
• Cross-Functional Collaboration – Instances where you had to align software goals with hardware limitations or business objectives.

Example questions or scenarios:

• "Tell me about the most complex software system you have designed from scratch. What were the primary bottlenecks?"
• "If you had to rebuild that project today, what architecture would you change and why?"
• "Explain a time when your software had to account for a hardware failure or physical limitation."

Key Responsibilities

As a Software Engineer at Astranis, your day-to-day responsibilities will revolve around designing, building, and testing software that ensures the success of our satellite missions. If you are on the Flight Software team, you will spend your time writing highly deterministic C++ or Rust code that runs directly on the spacecraft, managing everything from attitude control to payload telemetry. If you are on the Backend or Network teams, you will architect highly available cloud infrastructure, build data pipelines to process massive amounts of telemetry, and develop the tools our operators use to command the fleet.

Collaboration is a massive part of the job. You will work shoulder-to-shoulder with mechanical, electrical, and systems engineers. For example, when a new sensor is added to the satellite, you will work with the hardware team to understand the electrical interface, write the necessary drivers, and integrate the data stream into the broader software ecosystem. You will frequently participate in design reviews, where you must clearly communicate software constraints to hardware teams and vice versa.

Testing and validation are critical responsibilities. Because you cannot easily push a patch to a satellite once it is in orbit, you will spend a significant portion of your time writing automated tests, running hardware-in-the-loop (HITL) simulations, and participating in rigorous QA processes. You will drive initiatives to improve our testing infrastructure, ensuring that every line of code is battle-tested against the extreme conditions of space.

Role Requirements & Qualifications

To thrive as a Software Engineer at Astranis, you need a solid foundation in computer science paired with an exceptional ability to learn quickly and adapt to aerospace constraints. We look for engineers who are comfortable operating at the intersection of software and the physical world.

• Must-have skills – Proficiency in a core programming language (C++, Python, Go, or Rust depending on the specific team). Strong grasp of data structures, algorithms, and state machine design. Ability to write testable, highly reliable code. Excellent verbal technical communication, particularly the ability to think out loud during complex problem-solving.
• Nice-to-have skills – Experience with embedded systems, RTOS, or hardware-in-the-loop testing. Familiarity with low-level communication protocols (I2C, SPI). Previous experience in aerospace, robotics, or autonomous vehicles. Knowledge of cloud infrastructure (AWS, Docker, Kubernetes) for backend-focused roles.

The ideal candidate has a few years of experience building complex, mission-critical systems, though we highly value exceptional problem-solving abilities over specific industry tenure. You must be comfortable working in a fast-paced environment where requirements can shift and where you are expected to take extreme ownership of your deliverables.

Common Interview Questions

The questions below represent the types of technical and behavioral challenges candidates face during the Astranis interview process. While your specific questions will vary based on your interviewer and sub-specialty, these examples highlight our focus on state machines, first principles, and deep technical reasoning.

Coding and State Machines

This category tests your ability to write logical, extensible code and manage complex system states, which is heavily utilized in our flight and operational software.

• Implement a state machine to manage the transition of a satellite from "safe mode" to "operational mode."
• Write a function to parse a stream of hex data into actionable telemetry metrics.
• How would you extend your state machine code to handle an unexpected timeout from a peripheral device?
• Design an algorithm to filter out anomalous data points from a continuous sensor feed.
• Write a program to schedule tasks with varying priority levels under strict time constraints.

Hardware-Software Interface and First Principles

For embedded and systems-focused candidates, this category evaluates your understanding of physical constraints and basic electrical engineering principles.

• Walk me through the behavior of an I2C circuit. How do you handle bus collisions?
• How do capacitors function in filtering out voltage ripples in a power supply?
• Explain how you would calculate the temperature of a solar panel exposed to direct sunlight in a vacuum.
• What outputs would you expect at a specific test point in this given operational amplifier circuit?
• How do you design software to handle unexpected hardware resets or brownouts?

Architecture and System Design

This category focuses on your ability to design scalable, reliable systems, whether that is a cloud backend or an onboard software architecture.

• Design a system to ingest, store, and visualize gigabytes of telemetry data per minute.
• How would you architect a command-and-control service that guarantees message delivery to a remote satellite?
• Explain how you would minimize latency in a network software stack handling broadband traffic.
• Design a fault-tolerant software architecture that can survive a single-node failure without dropping critical data.
• Walk me through your approach to designing a hardware-in-the-loop testing framework.

Behavioral and Project Experience

We want to understand how you work, how you handle adversity, and how deeply you understand the systems you have built in the past.

• Walk me through the most technically impressive project on your resume. What was your exact contribution?
• Tell me about a time you had to defend a technical decision against a team member who disagreed with you.
• Describe a situation where you had to quickly learn a new technology or engineering domain to complete a project.
• How do you approach debugging an issue when the error cannot be easily reproduced locally?
• Tell me about a time you discovered a critical flaw in a system right before a major deadline.

Frequently Asked Questions

Q: How difficult are the technical interviews, and how should I prepare? The interviews are generally rated as moderately to highly difficult. They are fast-paced and require a solid grasp of fundamentals. Prepare by practicing state machine implementations, brushing up on basic physics/electrical concepts if you are targeting embedded roles, and practicing whiteboarding while explaining your thought process aloud.

Q: What differentiates a successful candidate from an unsuccessful one? Successful candidates do not just write correct code; they ask clarifying questions, articulate their assumptions, and handle interruptions gracefully. Interviewers at Astranis will frequently jump in to challenge your approach. Candidates who listen, adapt, and confidently discuss trade-offs perform best.

Q: Will I need to know specific physics or math equations by heart? Occasionally, yes. Some interviewers prefer candidates to know fundamental first principles (like basic thermal calculations or circuit behaviors) off the top of their heads without referencing documentation. Review your basic engineering physics if you are applying for a hardware-adjacent software role.

Q: What is the culture like during the interview process? The culture is highly curious, direct, and collaborative. Interviewers are generally described as polite and friendly, but they will push you technically. The process feels less like a formal exam and more like a working session with a future colleague.

Q: How long does the interview process typically take? The timeline from the initial recruiter screen to a final decision usually spans a few weeks. However, candidates have occasionally noted that communication between rounds can be slow, so patience and proactive follow-ups with your recruiter are recommended.

Other General Tips

• Think Out Loud, but Expect Interruptions: Our interviewers want to see your brain at work. Speak clearly about your strategy before writing code. If an interviewer interrupts you, do not get flustered—this is their way of guiding you or testing how you handle dynamic discussions.
• Ask the Right Questions Back: Interviewers often leave requirements intentionally vague. It is your responsibility to ask clarifying questions about constraints, edge cases, and expected inputs. Failing to ask the right questions is a common reason candidates stumble.

• Brush Up on First Principles: Even if you are a pure software engineer, reviewing the basics of how hardware interacts with software will give you a massive advantage. Understand the physical realities of the systems your code will govern.
• Be Ready for Whiteboarding: Whether virtual (Coderbyte) or physical, practice writing code without the aid of an IDE. Focus on clean syntax, clear variable names, and logical flow.

Summary & Next Steps

Joining Astranis as a Software Engineer is an opportunity to push the boundaries of aerospace technology and deliver critical connectivity to the world. The work is immensely challenging, requiring a unique blend of software mastery, an appreciation for physical engineering, and the resilience to build systems that must survive the vacuum of space.

Your interview preparation should focus heavily on mastering state machines, understanding hardware-software interfaces, and refining your ability to communicate complex ideas under pressure. Remember that our interviewers are looking for colleagues they can trust to solve hard problems alongside them. Approach every question as a collaborative engineering session, be ready to defend your choices, and do not shy away from the cross-disciplinary nature of the work.

The compensation module above provides a snapshot of the expected salary ranges for software and engineering roles at Astranis in San Francisco. When reviewing these figures, consider how your specific sub-specialty (e.g., Backend, Flight Software, Full Stack) and your years of experience align with the broader engineering bands.

You have the skills to succeed in this process. By focusing on fundamental engineering principles and practicing your technical communication, you will be well-prepared to tackle whatever challenges the interviewers present. For more insights and resources to refine your preparation, continue exploring the tools available on Dataford. Good luck!