PCB Design Engineer Interview Questions UK: 8 Real Questions and What Interviewers Want

Before your PCB Design Engineer interview, it helps to see the questions from the interviewer's side. We have picked eight from our set of 12 and added the reason each one gets asked.

Eight PCB Design Engineer interview questions, and what the interviewer is thinking

1. What does a typical week as a PCB design engineer involve, and what makes someone good at it?

Why they ask: They want to confirm you understand the role beyond pushing tracks around in CAD.

2. How do you approach the stack-up and controlled impedance for a board carrying high-speed signals such as USB or DDR memory?

Why they ask: Stack-up decisions affect signal integrity, cost and manufacturability, so they test core PCB knowledge.

3. Which IPC standards do you work to, and what do IPC classes mean for a design?

Why they ask: Knowledge of IPC standards shows professional competence and awareness of quality expectations.

4. How do you route differential pairs and match lengths, and what mistakes do you watch for?

Why they ask: Differential routing is a common daily task where careless work causes real signal integrity faults.

5. Explain return current paths and decoupling placement, and how they shape your layout decisions.

Why they ask: They want to see if you understand why layout rules exist, not just that they do.

6. What goes into a complete manufacturing release package, and how do you make sure library footprints are right?

Why they ask: Release errors and bad footprints are costly, so they check your discipline.

7. The fabricator raises a DFM query the evening before you intend to release: your minimum annular ring is below their capability. What do you do?

Why they ask: They want to see calm resolution of a real manufacturing issue under time pressure.

8. Tell me about a complex or tightly constrained board you laid out. How did you plan it and what compromises did you make?

Why they ask: They want evidence of planning, prioritisation and technical judgement.

A sample answer to question 1

What does a typical week as a PCB design engineer involve, and what makes someone good at it?

A typical week starts with reviewing schematics and requirements from the electronics engineers, checking footprints, constraints and the mechanical envelope before I place anything. Then I plan the stack-up and placement, route critical nets first, run design rule checks, and carry out peer reviews. There's regular dialogue with the fabricator and assembly house about capabilities, DFM feedback and prototype issues, and with mechanical engineers about connectors, mounting holes and height restrictions. I also maintain the component library and produce release packages with Gerbers, drill files, assembly drawings, pick and place data and the bill of materials. A good PCB designer is meticulous, because one wrong pad can scrap a batch, and understands the electrical reasons behind layout rules, so they can make sensible trade-offs and ask the right questions. They also need patience for iteration and clear communication with everyone around the board.

Common mistake to avoid: Describing only routing; Ignoring library and release work

Want the rest?

Full model answers, key points and common mistakes for all 12 questions are on the PCB Design Engineer interview questions page. The first five are free, no sign-up needed.