The questions below represent the types of technical and behavioral inquiries you will face during your interviews. They are designed to illustrate the patterns of our evaluation process rather than serve as a strict memorization list. Focus on the underlying concepts and how you would apply them to our specific aerospace challenges.

C/C++ & Embedded Fundamentals

This category tests your core programming abilities and your understanding of how software interacts with memory and hardware at the lowest levels.

• Explain the volatile keyword and provide a specific scenario where omitting it would cause a critical system failure.
• How do you prevent memory leaks and fragmentation in a resource-constrained embedded system?
• Write a function to implement a circular buffer for incoming UART data.
• What is the difference between an inline function and a macro, and when would you use each?
• Describe your process for optimizing a piece of C code that is executing too slowly for its required real-time deadline.

RTOS & System Architecture

These questions evaluate your ability to design robust, multi-threaded systems that guarantee deterministic execution.

• How do you design a system to recover gracefully from a watchdog timer reset?
• Explain the concept of a mutex versus a binary semaphore. Give an example of when to use each.
• Walk me through the architecture of a multi-threaded embedded system you recently designed. How did you allocate task priorities?
• How do you measure and monitor CPU utilization in an RTOS environment?
• Describe a challenging race condition you encountered and how you successfully debugged and resolved it.

Hardware Integration & Debugging

We assess your practical ability to bring up new boards and troubleshoot complex hardware-software interactions.

• You are trying to communicate with a new I2C sensor, but you are not getting an acknowledgment (ACK). Walk me through your debugging steps.
• How do you use an oscilloscope to verify the signal integrity of a high-speed SPI bus?
• Explain how a CAN bus handles message collisions and arbitration.
• Describe your experience with hardware bring-up. What is the very first thing you do when handed a new custom PCB?
• Tell me about a time you found a bug that turned out to be a hardware issue rather than a software fault. How did you prove it?

Behavioral & Problem Solving

These questions gauge your communication skills, your ability to handle ambiguity, and your alignment with our safety-first culture.

• Tell me about a time you had to push back on a deadline because you felt a system was not fully safe or tested.
• Describe a situation where you had to quickly learn a new technology or standard to complete a critical project.
• How do you handle disagreements with hardware engineers regarding the source of a system failure?
• Tell me about a project where the requirements were constantly changing. How did you adapt your embedded architecture?
• Why are you specifically interested in electric aviation and joining Beta Technologies?

5. Deep Dive into Evaluation Areas

To succeed in your interviews, you must demonstrate proficiency across several key technical and behavioral domains. Our teams look for engineers who possess deep foundational knowledge and the practical ability to apply it to complex aerospace challenges.

Embedded Software Fundamentals

This area is the bedrock of the Embedded Engineer role. We evaluate your ability to write highly efficient, reliable code that operates under strict memory and processing constraints. Strong performance here means writing clean C/C++ code, understanding memory allocation, and demonstrating a deep knowledge of microcontroller architectures.

Be ready to go over:

• C/C++ Mastery – Pointers, memory management, volatile variables, and bitwise operations.
• Microcontroller Architecture – Interrupt service routines (ISRs), timers, ADC/DAC, and direct memory access (DMA).
• Communication Protocols – Deep understanding of SPI, I2C, UART, and CAN bus.
• Advanced concepts (less common) – Assembly language basics, custom bootloader design, and bare-metal programming optimizations.

Example questions or scenarios:

• "Write a C function to reverse the bits of an 8-bit integer without using a lookup table."
• "Explain what happens when an interrupt occurs, and describe the best practices for writing an ISR."
• "Walk me through how you would configure a CAN bus interface to prioritize critical safety messages over routine telemetry."

Real-Time Operating Systems (RTOS)

Electric aviation requires deterministic, real-time responses. We evaluate your understanding of how to manage multiple tasks, synchronize data, and ensure critical deadlines are met. A strong candidate can architect a multi-threaded system without introducing race conditions or deadlocks.

Be ready to go over:

• Task Scheduling – Preemptive vs. cooperative scheduling, priority inversion, and rate monotonic scheduling.
• Concurrency & Synchronization – Mutexes, semaphores, message queues, and event flags.
• Resource Management – Memory pools, stack overflow prevention, and managing CPU load.
• Advanced concepts (less common) – RTOS kernel internals, custom scheduler implementation, and deterministic timing analysis.

Example questions or scenarios:

• "Describe a situation where priority inversion might occur and explain how you would resolve it using priority inheritance."
• "How do you safely share data between an interrupt service routine and a background RTOS task?"
• "Design a task architecture for a system that must read sensor data every 10ms, update a display every 100ms, and log data to flash memory asynchronously."

System Testing & Hardware-in-the-Loop (HIL)

Especially for roles focused on Airborne Software and Ground Support Equipment, testing is just as critical as development. We evaluate your ability to design robust test architectures that validate software against real-world hardware conditions. Strong performance involves a clear understanding of automated testing, scripting, and continuous integration for embedded systems.

Be ready to go over:

• Test Methodologies – Unit testing, integration testing, and system-level validation.
• Hardware-in-the-Loop (HIL) – Designing test rigs, simulating sensor inputs, and validating actuator outputs.
• Scripting & Automation – Using Python or similar languages to automate test sequences and analyze logs.
• Advanced concepts (less common) – DO-178C compliance testing, fault injection techniques, and automated HIL CI/CD pipelines.

Example questions or scenarios:

• "Walk me through how you would design a HIL test setup to validate a new battery management system firmware."
• "Describe a time you used a Python script to automate a tedious hardware testing process. What challenges did you face?"
• "How do you ensure comprehensive test coverage for safety-critical edge cases that are difficult to reproduce physically?"