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SonoHL

Firmware Intern

Montreal, QC, Canada

Internship

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Job details

Job type: Internship
Apply by: Apr 24, 2027
Posting language: English
Posted: Oct 26, 2026

Original job description

About the role

SonoHL is developing a wearable acoustic monitoring system for respiratory assessment. The firmware intern will work on the embedded software that runs the device, including sensor data acquisition, audio processing, and wireless communication. You’ll work alongside the hardware and software teams and see your code go onto real prototypes used in clinical testing.

Responsibilities

Develop and maintain firmware for custom microcontroller-based PCBs
Implement and debug wireless communication, including the 2.4 GHz radio stack and timing
Work with digital audio interfaces and sensor peripherals
Bring up and test new hardware revisions using lab equipment
Document firmware design decisions and maintain version-controlled code
Review peers’ code and contribute to team coding standards

Required qualifications

Proficiency in C/C++ and Python
Comfortable working in VS Code
Experience programming microcontrollers on custom PCBs
Experience with 2.4 GHz radio and its timing, such as Bluetooth LE, EnhancedBurst, or a proprietary protocol
Familiarity with time division multiple access (TDMA) or custom radio protocol design, including clock synchronization
Experience with I2C, SPI, I2S, and UART communication
Comfortable debugging hardware with a debugger, oscilloscope, and multimeter
Familiarity with Git for version control and documentation
Comfortable performing and receiving code reviews

Nice to have

Audio experience
Familiarity with audio codecs, the USB Audio Class, and sample rate conversion
Familiarity with low-power battery design

SonoHL is an equal oppurtunity employer. The work is in person in Montreal. The work is for a period of 4 months, starting in January 2026

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More about this job

Responsibilities

Develop and maintain firmware for custom microcontroller-based devices, including sensor data acquisition, digital audio interfaces, and wireless communication. Bring up and test hardware revisions, document and version-control firmware, and participate in code reviews and team coding standards.

Requirements

Requires proficiency in C/C++ and Python, experience programming microcontrollers on custom PCBs, and familiarity with 2.4 GHz radio communication, timing, and TDMA or custom protocols. Candidates should also be comfortable with I2C, SPI, I2S, UART, lab debugging tools, Git, and code reviews.

Skills

C/C++
Python
Microcontroller Firmware
Custom PCB Experience
2.4 GHz Radio Communication
Bluetooth LE
TDMA
Clock Synchronization
I2C
SPI
I2S
UART
Hardware Debugging
Oscilloscope
Git
Code Review

Visa sponsorship

Not detected in the job text

Keywords

Firmware
Embedded Software
C/C++
Python
Microcontrollers
Custom PCBs
Sensor Data Acquisition
Audio Processing
Wireless Communication
2.4 GHz Radio
Bluetooth LE
EnhancedBurst
TDMA
Clock Synchronization
I2C
SPI
I2S
UART
VS Code
Debugger
Oscilloscope
Multimeter
Git
Code Review
Audio Codecs
USB Audio Class
Sample Rate Conversion
Low-Power Battery Design
Medical Equipment Manufacturing

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