nrfconnect/sdk-nrf
Jan 2025 – Mar 2026
8 Months active
Languages Used
CRSTConfigurationYAMLKconfigPythonyamlrst
Technical Skills
Compiler FlagsConfiguration ManagementEmbedded SystemsPerformance OptimizationPower ManagementRTOS
Jan Zyczkowski
PROFILE
Jan Zyczkowski
Jan Zyżkowski developed and maintained embedded firmware and system features for the nrfconnect/sdk-nrf repository, focusing on power management, benchmarking, secure boot provisioning, and multi-core memory optimization. He implemented solutions using C, CMake, and Zephyr RTOS, such as integrating CoreMark benchmarking across new hardware, automating secure boot key provisioning, and enabling Bluetooth HID multi-identity bonding. Jan addressed cross-component event handling and improved documentation to clarify configuration and security requirements. His work demonstrated depth in configuration management, device tree customization, and memory management, resulting in more reliable, efficient, and secure workflows for Nordic Semiconductor’s embedded platforms and development teams.
Overall Statistics
Feature vs Bugs
82%Features
Repository Contributions
24Total
Bugs
3
Commits
24
Features
14
Lines of code
1,461
Activity Months8
Your Network
551 peopleWork History
March 2026
2 Commits • 2 Features
Mar 1, 2026Monthly summary for 2026-03: Implemented Axon model backend support in the classification sample with a configurable backend (Neuton vs Axon) and added board-specific configuration and documentation. Performed memory optimization for FLPR and PPR cores by reclaiming shared memory (removing IPC and DMA nodes) and updating memory regions, enabling larger or more capable models on constrained devices. These changes enhance deployment flexibility, reduce memory pressure, and improve hardware utilization across targeted Nordic SDK components.
2 Commits • 2 Features
Mar 1, 2026Monthly summary for 2026-03: Implemented Axon model backend support in the classification sample with a configurable backend (Neuton vs Axon) and added board-specific configuration and documentation. Performed memory optimization for FLPR and PPR cores by reclaiming shared memory (removing IPC and DMA nodes) and updating memory regions, enabling larger or more capable models on constrained devices. These changes enhance deployment flexibility, reduce memory pressure, and improve hardware utilization across targeted Nordic SDK components.
March 2026
November 2025
4 Commits • 2 Features
Nov 1, 2025November 2025: Delivered a two-stage radio core loader for the nRF54H20 with MRAM-to-TCM relocation and a demo sample; adapted the build system to relocate radio code to TCM RAM (CONFIG_XIP) and updated image handling for MCUboot direct-xip mode; enabled CPURAD for the nRF54H20 coremark benchmark. No major bugs fixed this month. Impact: faster and more deterministic radio startup, enhanced benchmarking visibility, and improved cross-core memory management. Demonstrated skills in embedded bootloaders, MRAM/TCM memory architecture, multi-core coordination, and build-system customization (CMake/CONFIG_XIP) with DTS labeling and sample development.
November 2025
4 Commits • 2 Features
Nov 1, 2025November 2025: Delivered a two-stage radio core loader for the nRF54H20 with MRAM-to-TCM relocation and a demo sample; adapted the build system to relocate radio code to TCM RAM (CONFIG_XIP) and updated image handling for MCUboot direct-xip mode; enabled CPURAD for the nRF54H20 coremark benchmark. No major bugs fixed this month. Impact: faster and more deterministic radio startup, enhanced benchmarking visibility, and improved cross-core memory management. Demonstrated skills in embedded bootloaders, MRAM/TCM memory architecture, multi-core coordination, and build-system customization (CMake/CONFIG_XIP) with DTS labeling and sample development.
August 2025
1 Commits • 1 Features
Aug 1, 2025August 2025 monthly summary focused on delivering a security-focused documentation improvement for secure boot provisioning in the nRF Desktop workflow within the sdk-nrf repository. No major defects were closed this period; the principal impact was clarifying provisioning requirements to support secure boot, including private/public key usage, the signing flow for application images, and KMU-based validation for the nRF54L MCUboot setup. This work reduces onboarding risk, strengthens security posture, and aligns troubleshooting and audits with MCUboot constraints across the team.
1 Commits • 1 Features
Aug 1, 2025August 2025 monthly summary focused on delivering a security-focused documentation improvement for secure boot provisioning in the nRF Desktop workflow within the sdk-nrf repository. No major defects were closed this period; the principal impact was clarifying provisioning requirements to support secure boot, including private/public key usage, the signing flow for application images, and KMU-based validation for the nRF54L MCUboot setup. This work reduces onboarding risk, strengthens security posture, and aligns troubleshooting and audits with MCUboot constraints across the team.
August 2025
July 2025
5 Commits • 3 Features
Jul 1, 2025July 2025: Delivered key features and targeted fixes in nrfconnect/sdk-nrf to improve user experience, deployment automation, and build maintainability. The work reduces manual steps, speeds testing cycles, and strengthens configuration clarity and security posture across deployments.
July 2025
5 Commits • 3 Features
Jul 1, 2025July 2025: Delivered key features and targeted fixes in nrfconnect/sdk-nrf to improve user experience, deployment automation, and build maintainability. The work reduces manual steps, speeds testing cycles, and strengthens configuration clarity and security posture across deployments.
June 2025
5 Commits • 3 Features
Jun 1, 2025June 2025 monthly summary for nrfconnect/sdk-nrf: Delivery focused on performance benchmarking, board support expansion, and reliability improvements. Key features delivered include CoreMark benchmarking support for the nRF54LM20 PDK with updated samples and overlays, FLPR core configuration for the nRF54LM20A PDK (including Kconfig changes and DTSI clock integration) to enable the board targets, and a 64-bit timestamp upgrade across time handling in the nrf_desktop and ble_bond modules to prevent timestamp overflows. No critical bugs were reported; however, the 64-bit timestamp enhancement provides a notable reliability improvement for long-running sessions and BLE workflows. Business value includes enabling performance assessment on new hardware, broader platform support for FLPR cores, and more robust event timing for desktop and BLE components. Technologies/skills demonstrated include CoreMark benchmarking integration, Kconfig/overlay/DTSI modifications, and 64-bit timekeeping practices.
5 Commits • 3 Features
Jun 1, 2025June 2025 monthly summary for nrfconnect/sdk-nrf: Delivery focused on performance benchmarking, board support expansion, and reliability improvements. Key features delivered include CoreMark benchmarking support for the nRF54LM20 PDK with updated samples and overlays, FLPR core configuration for the nRF54LM20A PDK (including Kconfig changes and DTSI clock integration) to enable the board targets, and a 64-bit timestamp upgrade across time handling in the nrf_desktop and ble_bond modules to prevent timestamp overflows. No critical bugs were reported; however, the 64-bit timestamp enhancement provides a notable reliability improvement for long-running sessions and BLE workflows. Business value includes enabling performance assessment on new hardware, broader platform support for FLPR cores, and more robust event timing for desktop and BLE components. Technologies/skills demonstrated include CoreMark benchmarking integration, Kconfig/overlay/DTSI modifications, and 64-bit timekeeping practices.
June 2025
April 2025
1 Commits • 1 Features
Apr 1, 2025Monthly summary for 2025-04 focusing on features delivered and impact for nrfconnect/sdk-nrf. Delivered a documentation improvement for the sysbuild partition manager configuration by adding a clarifying comment in sysbuild.conf to explain when the partition manager is disabled for certain SoCs to prevent build errors in the CoreMark sample. This change enhances configuration understandability, reduces build-time failures, and supports smoother CoreMark integration across supported devices.
April 2025
1 Commits • 1 Features
Apr 1, 2025Monthly summary for 2025-04 focusing on features delivered and impact for nrfconnect/sdk-nrf. Delivered a documentation improvement for the sysbuild partition manager configuration by adding a clarifying comment in sysbuild.conf to explain when the partition manager is disabled for certain SoCs to prevent build errors in the CoreMark sample. This change enhances configuration understandability, reduces build-time failures, and supports smoother CoreMark integration across supported devices.
March 2025
2 Commits
Mar 1, 2025March 2025 focused on stabilizing system power management integration and improving cross-component event propagation in the nRF Connect SDK. No new customer-facing features were released this month; two high-impact fixes improved reliability and clarity: correcting the Release Notes to accurately reflect system power management and board configurations, and fixing the DVFS module so that ble_peer_conn_params events propagate to all listeners, enabling nrf_desktop_ble_latency to receive connection parameter updates. These changes reduce release risk, improve latency visibility, and strengthen cross-module coordination.
2 Commits
Mar 1, 2025March 2025 focused on stabilizing system power management integration and improving cross-component event propagation in the nRF Connect SDK. No new customer-facing features were released this month; two high-impact fixes improved reliability and clarity: correcting the Release Notes to accurately reflect system power management and board configurations, and fixing the DVFS module so that ble_peer_conn_params events propagate to all listeners, enabling nrf_desktop_ble_latency to receive connection parameter updates. These changes reduce release risk, improve latency visibility, and strengthen cross-module coordination.
March 2025
January 2025
4 Commits • 2 Features
Jan 1, 2025January 2025 monthly summary for nrfconnect/sdk-nrf. Delivered power management integration for nrf_desktop on the nrf54h20 SoC, enabling PM on both application and radio cores, with S2RAM configuration options and updated documentation. Implemented CoreMark benchmark reliability and performance improvements, including cooperative main-thread priority, compiler optimizations, and enabled error logging for better fault visibility during runs. These changes reduce power consumption, improve benchmarking consistency, and provide clearer validation signals for QA and customers. Overall business impact: shorter validation cycles, improved energy efficiency in desktop workflows, and clearer telemetry on faults during benchmarks.
January 2025
4 Commits • 2 Features
Jan 1, 2025January 2025 monthly summary for nrfconnect/sdk-nrf. Delivered power management integration for nrf_desktop on the nrf54h20 SoC, enabling PM on both application and radio cores, with S2RAM configuration options and updated documentation. Implemented CoreMark benchmark reliability and performance improvements, including cooperative main-thread priority, compiler optimizations, and enabled error logging for better fault visibility during runs. These changes reduce power consumption, improve benchmarking consistency, and provide clearer validation signals for QA and customers. Overall business impact: shorter validation cycles, improved energy efficiency in desktop workflows, and clearer telemetry on faults during benchmarks.
Activity
Loading activity data...
Quality Metrics
Correctness94.6%
Maintainability91.6%
Architecture92.6%
Performance90.8%
AI Usage21.6%
Skills & Technologies
Programming Languages
CC++CMakeConfigurationKconfigPythonRSTYAMLrstyaml
Technical Skills
BenchmarkingBluetoothBluetooth Low EnergyBoard SupportBuild SystemsC programmingCI/CDCMakeCompiler FlagsConfiguration ManagementDevice ConfigurationDevice TreeDocumentationEmbedded SystemsEvent Handling
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline