Technical interview guide

Embedded C/C++ & Memory Constraints

Why systems programming on bare metal with kilobytes of RAM surfaces correctness issues that rarely bite on a general-purpose OS.

Read: 55 min
Practice MCQs: 25
Interview QA: 25
Edition: v3
Editorial status: Reviewed
Relevant for: Embedded Systems Engineer

Scope: GCC current C/C++ implementation and optimization guidance; CMSIS 6 startup/linker/compiler control; Arm ABI and SEI CERT guidance reviewed 2026-09-04.

Interview QA

Treat each question like a live interview question: answer out loud first (structure, assumptions, tradeoffs), then open the model answer to spot gaps and rehearse a tighter follow-up.

Curated: — · Written: 2026-09-11 · Reviewed: 2026-10-04

QA-1

Design and validate embedded C/C++ firmware for freestanding environment.

QA-2

Design and validate embedded C/C++ firmware for toolchain identity.

QA-3

Design and validate embedded C/C++ firmware for object sections.

QA-4

Design and validate embedded C/C++ firmware for BSS.

QA-5

Design and validate embedded C/C++ firmware for linker map.

QA-6

Design and validate embedded C/C++ firmware for stack budget.

QA-7

Design and validate embedded C/C++ firmware for stack overflow.

QA-8

Design and validate embedded C/C++ firmware for heap policy.

QA-9

Design and validate embedded C/C++ firmware for allocation size.

QA-10

Design and validate embedded C/C++ firmware for signed overflow.

QA-11

Design and validate embedded C/C++ firmware for unsigned arithmetic.

QA-12

Design and validate embedded C/C++ firmware for integer promotions.

QA-13

Design and validate embedded C/C++ firmware for shifts.

QA-14

Design and validate embedded C/C++ firmware for fixed-width types.

QA-15

Design and validate embedded C/C++ firmware for structure layout.

QA-16

Design and validate embedded C/C++ firmware for bit fields.

QA-17

Design and validate embedded C/C++ firmware for strict aliasing.

QA-18

Design and validate embedded C/C++ firmware for alignment.

QA-19

Design and validate embedded C/C++ firmware for object lifetime.

QA-20

Design and validate embedded C/C++ firmware for C++ static initialization.

QA-21

Design and validate embedded C/C++ firmware for exceptions and RTTI.

QA-22

Design and validate embedded C/C++ firmware for volatile boundary.

QA-23

Design and validate embedded C/C++ firmware for optimization validation.

QA-24

Design and validate embedded C/C++ firmware for diagnostics.

QA-25