Qualcomm embedded interview prep

Roles they hire for

• Embedded firmware engineer for wearable, PMIC and wireless chipsets
• Platform bring-up and driver engineer for multiprocessor SoCs

What they emphasise

• Board bring-up and driver design for multiprocessor environments
• Real-time firmware on Zephyr and FreeRTOS
• Peripheral work across UART, SPI, I2C, I3C, USB and SDIO
• Tracking hardware changes and their impact on firmware

Brush up on

ZephyrFreeRTOSMulticore IPCI3CSDIOCross-compilationUnit and integration testing

How the rounds usually run

A typical silicon vendor loop for embedded roles. Companies vary by team and seniority.

Online assessment or screen

• C output prediction, pointers and bit manipulation
• Digital logic and OS basics
• For experienced hires, often a recruiter and hiring-manager screen instead

Example: What does this print: an unsigned char set to 200 plus 100, printed as an integer?

Technical 1: C and embedded fundamentals

• Pointers, volatile, const, alignment and endianness
• Interrupts, stacks and memory layout
• Live C coding on bit fields, ring buffers or string handling

Example: Implement a lock-free single-producer, single-consumer ring buffer.

Technical 2: Drivers and architecture

• Designing a peripheral driver and its API
• DMA, caches and interrupt priorities
• RTOS internals and debugging stories

Example: Design a SPI driver that supports blocking, interrupt and DMA modes behind one API.

Technical 3 or hiring manager: system design and projects

• Deep dive into a past project and your design choices
• System-level trade-offs: power, memory, performance
• Sometimes a short presentation on a project

Example: Walk through the hardest bug you've fixed, and what you changed in the process afterwards.

HR and behavioural

• Motivation, teamwork and conflict
• Relocation, notice period and compensation

Example: Tell me about a time you disagreed with a design decision.

Practice questions

Original questions written for Qualcomm's focus areas, not leaked ones.

1. You get first silicon of a new SoC. Walk through the order in which you bring up clocks, memory, a debug UART and interrupts, and how you prove each step works.
2. Two cores share a peripheral. Design the ownership and messaging so neither core corrupts the other's transfers.
3. Design a driver API for an I3C controller that works both bare-metal and under an RTOS.
4. A wearable's firmware must log sensor data while the radio is busy. How do you size buffers and priorities so nothing is dropped?
5. An SDIO transfer occasionally returns corrupted blocks only at high clock rates. How do you narrow it down between hardware and firmware?

Your prep playlist

Design rounds to practise

Sources

• Engineer Senior, Core Platform (Bangalore)
• Embedded and platform bring-up role