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Rafał Kuźnia

PROFILE

Rafał Kuźnia

Worked extensively on Nordic nRF platform software, delivering features and fixes across the nrfconnect/sdk-nrf and sdk-nrfxlib repositories. Focused on embedded systems, radio communication, and Bluetooth development, this engineer enhanced device drivers, improved build system reliability, and expanded hardware support for new SoCs. Leveraging C and CMake, they refactored low-level drivers, modernized APIs, and introduced configurable options for timing and resource management. Their work included test automation, CI/CD improvements, and device tree configuration, resulting in more stable builds, reproducible dependencies, and streamlined onboarding for new hardware. The approach emphasized maintainability, cross-repo compatibility, and robust wireless protocol integration.

Overall Statistics

Feature vs Bugs

67%Features

Repository Contributions

79Total
Bugs
17
Commits
79
Features
35
Lines of code
12,784
Activity Months14

Work History

May 2026

3 Commits • 1 Features

May 1, 2026

May 2026 – nrfconnect/sdk-nrf: Delivered initial NRF54LS05A board support in Bluetooth samples to broaden hardware compatibility and testing coverage. To address CI RAM overflow, removed the NRF54LS05A build from Bluetooth samples and purged related configurations (iso_time_sync and multiple identities). Result: more stable CI, shorter build times, and cleaner sample configurations; increased customer hardware support and faster feedback cycles. Demonstrated skills in sample overlays, build configuration, and careful change management.

January 2026

1 Commits • 1 Features

Jan 1, 2026

In 2026-01, delivered a naming clarity improvement in the nrfconnect/sdk-nrf repo by renaming the device tree binding from generic-fem-two-ctrl-pins to radio-fem-two-ctrl-pins. This aligns with existing conventions, reduces risk of misconfiguration, and improves maintainability for RF FEM configurations. The change was implemented in a single, auditable commit (b1303bbfc2070bfe3020ae6f2ce360b29f87bef9) with a signed-off message, reflecting disciplined development and traceability.

November 2025

2 Commits • 1 Features

Nov 1, 2025

In 2025-11, the sdk-nrfxlib team delivered cross-family multiprotocol timing enhancements and a stability fix for the NRF 802.15.4 radio, reinforcing reliability and compliance across NRF52/53/54L. The changes improve Bluetooth and 802.15.4 performance, reduce EM emission-related risk, and streamline integration for multi-protocol devices.

October 2025

1 Commits • 1 Features

Oct 1, 2025

In 2025-10, delivered a major feature enhancement for the nrf_802154 component within the sdk-nrfxlib repository, focusing on revision updates and CSMA/CA refactor. The work improves modularity, maintainability, and performance visibility in multiprotocol radio environments. It includes documentation updates, driver logic refinements, and a dedicated CSMA/CA backoff module, supported by a targeted commit.

September 2025

22 Commits • 11 Features

Sep 1, 2025

September 2025 monthly highlights across Nordic platforms. Delivered key dependency and API improvements, with a focus on stability, configurability, and business value for wireless connectivity stacks (802.15.4) across the NRFX/NRF and Zephyr ecosystems. The work emphasizes reproducible builds, forward-looking driver improvements, and streamlined migration paths for API changes.

August 2025

5 Commits • 3 Features

Aug 1, 2025

August 2025 monthly summary for cross-repo NRF RF software work focused on enhancing timing fidelity, stability, and maintainability of the 802.15.4 stack and associated drivers across the nrfxlib, nrf, and Zephyr components. Delivered a new Transmit Timestamp Provider, stabilized CSMA-CA/IFS operations, added HFXO startup latency configurability, improved frame handling, and strengthened integration with Zephyr and NRF FEM resource management.

July 2025

6 Commits • 1 Features

Jul 1, 2025

July 2025 monthly performance summary focusing on reliability, platform support, and cross-repo improvements for Nordic nRF platforms. Delivered robust timestamp handling, safe frame processing, and stable clock control in low-level drivers, along with expanded SoC support and improved timestamp reliability across nRF52/53 families. These changes reduce runtime asserts, minimize packet drops due to oversized frames, and broaden device compatibility, enhancing field reliability and customer experience.

June 2025

14 Commits • 5 Features

Jun 1, 2025

June 2025 focused on reliability, configurability, and observability across AmbiqZephyr and NRF SDKs. Delivered clock startup latency tuning for NRF54L devices, HFXO latency API and CSMA/CA configurability for 802.15.4, CSMA-CA/CCA configuration enhancements with documentation, device-tree HFCLK/latency refinements, and critical 802.15.4 bug fixes. These changes improve startup times, power efficiency, TX/RX timing accuracy, and telemetry observability, enabling better performance in IoT deployments and cross-SoC compatibility.

May 2025

4 Commits • 2 Features

May 1, 2025

May 2025 monthly summary focusing on code quality, feature consolidation, and radio-performance improvements across sdk-nrf, sdk-nrfxlib, and ambiqzephyr. Delivered code cleanup, integrated configuration, and standardization efforts that reduce maintenance burden and improve measurement accuracy.

April 2025

5 Commits • 1 Features

Apr 1, 2025

April 2025 monthly summary for sdk-nrf and sdk-nrfxlib. Focused on stabilizing 802.15.4 configuration, improving reliability of MPSL clock events, and standardizing the build system to reduce upstream issues. Delivered concrete features and fixes across two repos, enhancing test visibility and cross-repo compatibility.

February 2025

2 Commits • 1 Features

Feb 1, 2025

February 2025 performance summary for nrfconnect/sdk-nrfxlib: hardware support and CI reliability improvements that strengthen build stability and enable faster onboarding for new chips. Delivered features and fixes with clear business value.

December 2024

6 Commits • 2 Features

Dec 1, 2024

December 2024 focused on expanding test coverage for NRF54L28/NRF54L09 family, enabling hardware-specific samples, and hardening stability against known NRFX issues. Delivered automated test validation, hardware enablement, and reliability fixes that directly improve QA throughput and field robustness for our Zephyr NRF platform.

November 2024

7 Commits • 4 Features

Nov 1, 2024

November 2024 highlights: delivered cross-repo platform stability and API modernization across nrfconnect/sdk-nrfxlib and NordicBuilder/sdk-nrf, enabling reliable builds (including Matter integration), improved cross-SoC compatibility, and stronger resource management across DPPI/PPI subsystems.

October 2024

1 Commits • 1 Features

Oct 1, 2024

2024-10 monthly summary for nrfconnect/sdk-zephyr. Delivered NRFX Reservation Enhancement for NCS Module Compatibility: NRFX reservations were adjusted to include NCS-specific modules (mpsl and nrfe) in nrfx_config_reserved_resources, improving compatibility and resource management for Nordic hardware. No major bugs fixed this month; focus was on cross-module alignment and stable integration via cherry-picked changes. Impact: smoother builds, reduced resource conflicts, and easier onboarding of NCS modules; supports broader Nordic hardware support. Technologies/skills demonstrated: NRFX, MPSL, NRFE, NCS, Zephyr, Git cherry-pick, cross-repo coordination.

Activity

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Quality Metrics

Correctness91.2%
Maintainability90.4%
Architecture90.0%
Performance83.8%
AI Usage20.2%

Skills & Technologies

Programming Languages

CCMakeCmakeDTSDevice TreeRSTYAMLccmakedts

Technical Skills

802.15.4API IntegrationAPI MigrationBluetoothBluetooth developmentBuild System ConfigurationBuild System ManagementBuild SystemsC ProgrammingC programmingC/C++CI/CDCmakeConfiguration ManagementDependency Management

Repositories Contributed To

8 repos

Overview of all repositories you've contributed to across your timeline

nrfconnect/sdk-nrfxlib

Nov 2024 Nov 2025
10 Months active

Languages Used

CCmakeYAMLcmakeCMakereStructuredText

Technical Skills

Build System ConfigurationDriver DevelopmentEmbedded SystemsEmbedded Systems DevelopmentFirmware DevelopmentHardware Configuration

nrfconnect/sdk-nrf

Apr 2025 May 2026
7 Months active

Languages Used

CCmakeDevice TreeRSTYAMLrstCMake

Technical Skills

CmakeDriver DevelopmentEmbedded SystemsFirmware DevelopmentRadio CommunicationSoC Configuration

nrfconnect/sdk-zephyr

Oct 2024 Sep 2025
4 Months active

Languages Used

CYAML

Technical Skills

C programmingembedded systemshardware abstraction layerDriver DevelopmentEmbedded SystemsHardware Abstraction Layer

telink-semi/zephyr

Dec 2024 Dec 2024
1 Month active

Languages Used

CDTSYAMLcoverlayyaml

Technical Skills

Configuration ManagementDevice DriversDevice TreeDriver DevelopmentEmbedded SystemsHardware bring-up

AmbiqMicro/ambiqzephyr

May 2025 Jun 2025
2 Months active

Languages Used

Cdts

Technical Skills

Embedded SystemsHardware Abstraction Layer (HAL)Wireless CommunicationDevice DriversHardware ConfigurationReal-Time Operating Systems (RTOS)

zephyrproject-rtos/zephyr-testing

Sep 2025 Sep 2025
1 Month active

Languages Used

CYAML

Technical Skills

API MigrationConfiguration ManagementDependency ManagementDevice DriversDriver DevelopmentEmbedded Systems

NordicBuilder/sdk-nrf

Nov 2024 Nov 2024
1 Month active

Languages Used

C

Technical Skills

Driver DevelopmentEmbedded SystemsHardware Abstraction Layer (HAL)Hardware InteractionRTOSResource Management

zephyrproject-rtos/zephyr

Sep 2025 Sep 2025
1 Month active

Languages Used

C

Technical Skills

API IntegrationDriver DevelopmentEmbedded Systemsmanifest managementversion control