Kristoffer S
Team Lead, Principal R&D Engineer, Embedded Systems at Nordic Semiconductor
Oslo, Norway
Summary
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Rockstar🎓
Top SchoolKristoffer S is a Principal R&D Engineer and team lead based in Oslo with nine years of embedded systems experience, now leading LE Audio development at Nordic Semiconductor. He blends deep C/C++ and RTOS expertise with hands-on hardware skills—PCB design, lab bring-up and MCU peripheral configuration—while driving real-time audio features like LC3, Auracast and ISO channel handling. An active open-source contributor to flagship projects such as Zephyr and the nRF Connect SDK, he added board support for the nRF5340 Audio DK and tuned Bluetooth LE Audio streaming and timestamping. His background includes a PhD in cybernetics and applied research in aquaculture feed systems, bringing a unique systems-modeling perspective to product engineering. Known for test-driven practices, customer-facing debugging, and teaching experience, he combines rigorous academic training with practical firmware delivery at scale.
8 years of coding experience
1 year of employment as a software developer
Bachelor of Science Cybernetics / Automation, Bachelor of Science Cybernetics / Automation at Oslo and Akershus University CollegeEconomics and administration, Economics and administration at Stabekk vgs.Norwegian University of Science and Technology
Norwegian, English, German, Danish, Swedish, French
Stackoverflow
101reputation
4kreached
0answers
4questions
Github Skills (32)
embedded-language10
zephyr-rtos10
bluetooth-le10
microcontroller10
zephyr10
device-tree10
rtos10
btle10
sys10
bluetooth10
rt10
embedded10
bluetooth-low-energy10
i2s10
c119
Programming languages (5)
Github contributions (5)
nrfconnect/sdk-nrf
Apr 2022 - Jan 2023
nRF Connect SDK main repository
Role in this project:
Embedded Systems Engineer / IoT Developer
Embedded Systems Engineer / IoT DeveloperContributions:964 reviews, 20 commits, 127 PRs in 9 months
Contributions summary:Kristoffer contributed extensively to the nRF Connect SDK, focusing on the nRF5340 Audio application. Their work involved adding and testing audio applications, including testing and integration of the Low Complexity Subband Codec (LC3) and the Serial Data Interface (SDI) for both unicast and broadcast modes. They also made fixes related to timestamping and ISO stream handling, which optimized data transfer across BLE channels. Furthermore, they added tests and resolved code quality issues.
connect-sdknrf-connect-sdkinfinibandlteppp
zephyrproject-rtos/zephyr
Oct 2017 - Apr 2025
Primary Git Repository for the Zephyr Project. Zephyr is a new generation, scalable, optimized, secure RTOS for multiple hardware architectures.
Role in this project:Embedded Systems Engineer / IoT Developer
Embedded Systems Engineer / IoT DeveloperContributions:131 reviews, 17 PRs, 248 comments in 7 years 7 months
Contributions summary:Kristoffer's contributions primarily involve adding support for the nRF5340 Audio DK board to the Zephyr RTOS. This includes adding board-specific definitions for Arduino headers and MCUboot functionality, modifying device tree files for peripheral configuration (I2C, ADC, SPI), and creating documentation. Furthermore, the user fixed compiler warnings and corrected Bluetooth audio stream handling, indicating a good understanding of the Zephyr RTOS environment and its interaction with hardware and peripherals.
bluetooth-lereal-timezephyrsecuregit-repository
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