Why hardware internship candidates stall at debugging

I feel like the more I scan Reddit, the more I see the same pattern: someone applies to 30 hardware engineering internships, gets a few screens, then fizzles out because they can’t talk through basic debug and troubleshooting situations. It’s not because they’re necessarily “bad.”

As someone who’s screened for hardware and ECE interns, I hear this a lot:

Student: “Oh yeah, I did a class project and played around with an Arduino in my dorm.”

Engineer: “I took a board from schematic to bring-up on my electric racing team. I measured and scoped power rails, CAN bus, and low-voltage signals going from PCB to PCB.”

Hardware internships often follow the same loop: build something small, measure it, debug it, document it, repeat. That’s very much by design, and mostly a function of the internship being ~3 months. Because of that, having an order of operations or framework matters, even if it feels formulaic:

• Power first: Is anything shorted? Are the rails at the right voltage under load? Any ugly ripple or droop? Is the regulator stable?
• Reset and clocks next: Is reset actually releasing? Is the clock present and the right frequency? (Worth checking noise and signal quality too.)
• Then buses/firmware: Know how these work: I2C / SPI / UART. Do you see traffic? Are pull-ups correct? Is one device holding the line low?

How do you actually get good at this? Practice talking through scenarios like these:

• Prompt 1 (easy): “The board is dead. No LEDs. What do you measure first?”
• Prompt 2 (decent): “I2C SDA is stuck low. Give me 3 causes and how you’d prove each.”
• Prompt 3 (I like this): “You’re powering an FPGA core rail. How do you choose decoupling and where do you place it?”

There are a lot of resources out there. Rotate between vendor app notes and datasheets (TI / ADI), a prompt bank like Voltage Learning, and something like Art of Electronics to fill the gaps. If you want a software-adjacent tool, LeetCode is fine for practicing basic scripting and problem solving. But the resource I recommend the most is the actual job description for the role.

Teams don’t hire a GPA. They hire someone who can hear “it doesn’t work” and turn it into a short list of measurements, then a fix. If you can show you’ve done that even once, with scope screenshots and a bring-up log, you’ll stand out fast.