
Piotr Kosycarz developed and maintained embedded systems infrastructure across the nrfconnect/sdk-nrf and nrfconnect/sdk-zephyr repositories, focusing on hardware enablement, automated testing, and power benchmarking for Nordic platforms. He engineered robust CI/CD pipelines and test automation using Python, C, and YAML, integrating board-level configuration and device driver validation to accelerate hardware bring-up and ensure reliable cross-platform support. His work included optimizing memory and power management, expanding Bluetooth and UART driver coverage, and refining quarantine tooling to isolate unstable features. By aligning test frameworks and streamlining configuration management, Piotr improved release reliability and reduced validation cycles for complex embedded deployments.
March 2026 performance summary focused on delivering reliable power and performance insights, streamlining validation, and enabling better health checks across multi-repo Zephyr/Nordic builds. Key contributions include power profiling improvements for Bluetooth peripherals, multicore idle power benchmarking, CI/test optimization, provisioning tooling updates (LM20B), cross-board PWM stability enhancements, and alignment of ADC tests with hardware buck specs. These efforts translated into tangible business value by improving measurement accuracy, reducing flaky validations, and accelerating CI feedback loops across the sdk-nrf and Zephyr ecosystems.
March 2026 performance summary focused on delivering reliable power and performance insights, streamlining validation, and enabling better health checks across multi-repo Zephyr/Nordic builds. Key contributions include power profiling improvements for Bluetooth peripherals, multicore idle power benchmarking, CI/test optimization, provisioning tooling updates (LM20B), cross-board PWM stability enhancements, and alignment of ADC tests with hardware buck specs. These efforts translated into tangible business value by improving measurement accuracy, reducing flaky validations, and accelerating CI feedback loops across the sdk-nrf and Zephyr ecosystems.
February 2026 (2026-02) monthly summary focusing on key business and technical outcomes across three repositories. Highlights include substantial quarantine infrastructure enhancements for Zephyr integration, CI/test-system improvements, standardized tagging for sample configurations, and targeted bug fixes that improved stability and test reliability. Key features delivered: - Quarantine and Zephyr integration: extended quarantine scripts, added new samples (sample.mcumgr.smp_svr.nrf, sample.radio_test, sample.dtm), and encryption support (sample.mcuboot_with_encryption); several fixes to preserve ram_load and correct platform handling (sample.bluetooth.hci_ipc) and to address regression in llext/tls configurations. - CI and test infrastructure: expanded CI app test dependencies and tagging, extended test-spec scoping, and refined hardware scope (skip nrf54 dongle; test only nrf52 dongle; added hal_nordic dependency). - Tagging standardization: unified tagging for sample configurations across Zephyr and NRF from-tree, enabling consistent filtering and discovery in large-scale configurations. - Samples, boards, and tests: PCA63565 shield updates (remove mcuboot-button0; add shield.yaml); esb_ptx_ble regex fix; snippets: coverage latency improvements for UART tests. Major bugs fixed: - Power management in coverage mode: disabling PM in coverage tests to stabilize test runs. - Communication and timing: grtc_reset instability fixes; encoding issues in tests prevented false failures. - Quarantine reliability: fixes to quarantine behavior for ls05 samples and platform alignment; preserve ram_load sample; ensure proper quarantine for bluetooth hci_ipc. Overall impact and accomplishments: - Improved automation reliability and faster feedback from CI; reduced flaky test outcomes; better maintainability through cross-repo tagging standards; broader test coverage with extended dependencies; enabled encryption-ready quarantine flow. Technologies/skills demonstrated: - Bash scripting and quarantine tooling, Zephyr integration, CI/test-spec tooling, YAML tagging conventions, cross-repo collaboration (cherry-picks across nrfx from-tree), and hardware/board configuration updates.
February 2026 (2026-02) monthly summary focusing on key business and technical outcomes across three repositories. Highlights include substantial quarantine infrastructure enhancements for Zephyr integration, CI/test-system improvements, standardized tagging for sample configurations, and targeted bug fixes that improved stability and test reliability. Key features delivered: - Quarantine and Zephyr integration: extended quarantine scripts, added new samples (sample.mcumgr.smp_svr.nrf, sample.radio_test, sample.dtm), and encryption support (sample.mcuboot_with_encryption); several fixes to preserve ram_load and correct platform handling (sample.bluetooth.hci_ipc) and to address regression in llext/tls configurations. - CI and test infrastructure: expanded CI app test dependencies and tagging, extended test-spec scoping, and refined hardware scope (skip nrf54 dongle; test only nrf52 dongle; added hal_nordic dependency). - Tagging standardization: unified tagging for sample configurations across Zephyr and NRF from-tree, enabling consistent filtering and discovery in large-scale configurations. - Samples, boards, and tests: PCA63565 shield updates (remove mcuboot-button0; add shield.yaml); esb_ptx_ble regex fix; snippets: coverage latency improvements for UART tests. Major bugs fixed: - Power management in coverage mode: disabling PM in coverage tests to stabilize test runs. - Communication and timing: grtc_reset instability fixes; encoding issues in tests prevented false failures. - Quarantine reliability: fixes to quarantine behavior for ls05 samples and platform alignment; preserve ram_load sample; ensure proper quarantine for bluetooth hci_ipc. Overall impact and accomplishments: - Improved automation reliability and faster feedback from CI; reduced flaky test outcomes; better maintainability through cross-repo tagging standards; broader test coverage with extended dependencies; enabled encryption-ready quarantine flow. Technologies/skills demonstrated: - Bash scripting and quarantine tooling, Zephyr integration, CI/test-spec tooling, YAML tagging conventions, cross-repo collaboration (cherry-picks across nrfx from-tree), and hardware/board configuration updates.
January 2026: CI and test-ecosystem modernization across Nordic and Zephyr ecosystems. Delivered a comprehensive CI test-spec refresh for RS, Thread, Matter, FEM, BLE, Boot, and DFU tests, aligning with the current test suite and enabling per-SOC/board granularity. Implemented LS05 DK bring-up across samples, tests, boards, and benchmarks (defaulting Nordic nrf54ls05dk to 0.2.0) to accelerate hardware validation. Expanded quarantine and test infrastructure to improve stability, resource control, and test coverage (including quarantine_zephyr, quarantine_integration, and related samples/build-system artifacts). Enhanced debugging and reliability through test-fix batches and tooling improvements, and streamlined CI dependencies and tags to improve downstream CI reliability and speed.
January 2026: CI and test-ecosystem modernization across Nordic and Zephyr ecosystems. Delivered a comprehensive CI test-spec refresh for RS, Thread, Matter, FEM, BLE, Boot, and DFU tests, aligning with the current test suite and enabling per-SOC/board granularity. Implemented LS05 DK bring-up across samples, tests, boards, and benchmarks (defaulting Nordic nrf54ls05dk to 0.2.0) to accelerate hardware validation. Expanded quarantine and test infrastructure to improve stability, resource control, and test coverage (including quarantine_zephyr, quarantine_integration, and related samples/build-system artifacts). Enhanced debugging and reliability through test-fix batches and tooling improvements, and streamlined CI dependencies and tags to improve downstream CI reliability and speed.
December 2025: Delivered cross-repo improvements for nrfconnect/sdk-nrf and nrfconnect/sdk-zephyr focused on power efficiency, platform coverage, and test reliability. Key features and reliability enhancements include NRFX 4.0 alignment for Bluetooth lv10/ns, TF-M system-off integration for tests, and enabling system-off based power profiling for lv10/ns. Expanded LS05 platform support with BT HCI SDC and associated samples. Migrated Bluetooth audio test configurations to native_sim across ASCS and PACS, and replaced the console harness with ztest for mbedtls psa tests to improve reliability. CI/test-spec updates added granularity and targeted coverage. Taken together, these changes improve hardware coverage, reduce testing noise, and accelerate feedback loops for power, security, and Bluetooth features.
December 2025: Delivered cross-repo improvements for nrfconnect/sdk-nrf and nrfconnect/sdk-zephyr focused on power efficiency, platform coverage, and test reliability. Key features and reliability enhancements include NRFX 4.0 alignment for Bluetooth lv10/ns, TF-M system-off integration for tests, and enabling system-off based power profiling for lv10/ns. Expanded LS05 platform support with BT HCI SDC and associated samples. Migrated Bluetooth audio test configurations to native_sim across ASCS and PACS, and replaced the console harness with ztest for mbedtls psa tests to improve reliability. CI/test-spec updates added granularity and targeted coverage. Taken together, these changes improve hardware coverage, reduce testing noise, and accelerate feedback loops for power, security, and Bluetooth features.
November 2025 monthly summary focusing on business value and technical achievements across two primary repos (nrfconnect/sdk-nrf and nrfconnect/sdk-zephyr). The month delivered broader LV10/NS coverage, improved debugging capabilities, and strengthened test/CI hygiene, driving faster feedback and more robust product readiness while maintaining power and security considerations.
November 2025 monthly summary focusing on business value and technical achievements across two primary repos (nrfconnect/sdk-nrf and nrfconnect/sdk-zephyr). The month delivered broader LV10/NS coverage, improved debugging capabilities, and strengthened test/CI hygiene, driving faster feedback and more robust product readiness while maintaining power and security considerations.
October 2025 monthly performance summary: Delivered platform deprecation cleanup, stability improvements for LV10 configurations, and enhancements to CI, quarantine tooling, and test coverage across sdk-zephyr, sdk-nrf, and nxp-upstream Zephyr. Key outcomes include configuration simplification, reduced nondeterminism in LV10 DTS, improved peripheral reliability, and expanded LV10/ns support, all contributing to faster, more predictable releases and safer platform evolution.
October 2025 monthly performance summary: Delivered platform deprecation cleanup, stability improvements for LV10 configurations, and enhancements to CI, quarantine tooling, and test coverage across sdk-zephyr, sdk-nrf, and nxp-upstream Zephyr. Key outcomes include configuration simplification, reduced nondeterminism in LV10 DTS, improved peripheral reliability, and expanded LV10/ns support, all contributing to faster, more predictable releases and safer platform evolution.
September 2025 highlights: LV10 readiness and stability expanded across core Nordic/NRF and Zephyr projects, delivering memory-conscious security improvements, broader hardware support, and stronger test automation. The month focused on business value through RAM optimization, LV10-enabled builds, and improved CI/test coverage, enabling faster validation and faster time-to-market for LV10-capable boards and features.
September 2025 highlights: LV10 readiness and stability expanded across core Nordic/NRF and Zephyr projects, delivering memory-conscious security improvements, broader hardware support, and stronger test automation. The month focused on business value through RAM optimization, LV10-enabled builds, and improved CI/test coverage, enabling faster validation and faster time-to-market for LV10-capable boards and features.
August 2025 monthly summary: Delivered stability, performance, and validation improvements across three repositories (nrfconnect/sdk-nrf, nxp-upstream/zephyr, nrfconnect/sdk-zephyr). Key work focused on boot stability for Nordic hardware, LV10 feature enablement, security/testing enhancements, and test infrastructure uplift, delivering tangible business value through more reliable hardware validation, faster debugging, and stronger security validation.
August 2025 monthly summary: Delivered stability, performance, and validation improvements across three repositories (nrfconnect/sdk-nrf, nxp-upstream/zephyr, nrfconnect/sdk-zephyr). Key work focused on boot stability for Nordic hardware, LV10 feature enablement, security/testing enhancements, and test infrastructure uplift, delivering tangible business value through more reliable hardware validation, faster debugging, and stronger security validation.
July 2025 monthly summary for nrfconnect/sdk-nrf. Focused on strengthening CI/test reliability, stabilizing security-related code, and delivering targeted tests/benchmarks improvements that enhance release readiness and power/radio performance validation. Key outcomes include: streamlined CI/test execution with flexible rule handling; improved test and sample configurations for LV10/LM20 platforms; security reliability hardening; and richer power/performance benchmarking support.
July 2025 monthly summary for nrfconnect/sdk-nrf. Focused on strengthening CI/test reliability, stabilizing security-related code, and delivering targeted tests/benchmarks improvements that enhance release readiness and power/radio performance validation. Key outcomes include: streamlined CI/test execution with flexible rule handling; improved test and sample configurations for LV10/LM20 platforms; security reliability hardening; and richer power/performance benchmarking support.
June 2025 monthly summary for nrfconnect/sdk-nrf focusing on hardware enablement, CI improvements, and power/performance instrumentation to accelerate validation, reduce risk, and improve traceability across Nordic platforms.
June 2025 monthly summary for nrfconnect/sdk-nrf focusing on hardware enablement, CI improvements, and power/performance instrumentation to accelerate validation, reduce risk, and improve traceability across Nordic platforms.
May 2025 monthly summary: Delivered cross-repo hardware enablement and platform expansion across nrfconnect/sdk-nrf and AmbiqMicro/ambiqzephyr, enhancing hardware coverage, testing reliability, and developer efficiency. Key outcomes include broad LM20 DK enablement across samples, drivers, tests, and crypto/keys; LV10 platform support across samples, tests, and boards with explicit default versions and LV10 testing enablement; and Nordic LV10 DK support with SDC and initial Bluetooth samples. The USB HID Mouse sample now ships with a default configuration, improving onboarding and out-of-box usability. Maintenance and CI health were strengthened through quarantine of unstable drivers and updates to CI/test dependencies and CODEOWNERS. Demonstrated breadth of technologies and skills, including Zephyr RTOS bring-up, hardware bring-up on LM20/LV10, SPI/UART/CSP packaging, Bluetooth, USB, and automated testing fixtures for improved reliability.
May 2025 monthly summary: Delivered cross-repo hardware enablement and platform expansion across nrfconnect/sdk-nrf and AmbiqMicro/ambiqzephyr, enhancing hardware coverage, testing reliability, and developer efficiency. Key outcomes include broad LM20 DK enablement across samples, drivers, tests, and crypto/keys; LV10 platform support across samples, tests, and boards with explicit default versions and LV10 testing enablement; and Nordic LV10 DK support with SDC and initial Bluetooth samples. The USB HID Mouse sample now ships with a default configuration, improving onboarding and out-of-box usability. Maintenance and CI health were strengthened through quarantine of unstable drivers and updates to CI/test dependencies and CODEOWNERS. Demonstrated breadth of technologies and skills, including Zephyr RTOS bring-up, hardware bring-up on LM20/LV10, SPI/UART/CSP packaging, Bluetooth, USB, and automated testing fixtures for improved reliability.
April 2025 performance summary for the development team: expanded Nordic LM20/LV10 DK readiness and test coverage, reinforced core subsystems (USB, watchdog, system_off, retained_mem), and improved CI/do x ygen hygiene. Delivered tangible business value through broader hardware support, more robust samples and tests, and clearer traceability from commits to outcomes.
April 2025 performance summary for the development team: expanded Nordic LM20/LV10 DK readiness and test coverage, reinforced core subsystems (USB, watchdog, system_off, retained_mem), and improved CI/do x ygen hygiene. Delivered tangible business value through broader hardware support, more robust samples and tests, and clearer traceability from commits to outcomes.
March 2025 monthly summary for nrfconnect/sdk-nrf focused on expanding hardware coverage, stabilizing test infrastructure, and optimizing resource usage to accelerate product validation and release readiness.
March 2025 monthly summary for nrfconnect/sdk-nrf focused on expanding hardware coverage, stabilizing test infrastructure, and optimizing resource usage to accelerate product validation and release readiness.
February 2025 (2025-02) monthly summary for nrfconnect/sdk-nrf: Delivered extensive test and quality improvements across UART, SPI, I2C, and DMIC drivers, enhanced quarantine and CI tagging governance, and expanded test infrastructure for qdec/settings with clear ownership. These changes improved validation coverage, reduced release risk, and strengthened traceability and debugging capabilities.
February 2025 (2025-02) monthly summary for nrfconnect/sdk-nrf: Delivered extensive test and quality improvements across UART, SPI, I2C, and DMIC drivers, enhanced quarantine and CI tagging governance, and expanded test infrastructure for qdec/settings with clear ownership. These changes improved validation coverage, reduced release risk, and strengthened traceability and debugging capabilities.
Concise monthly summary for 2025-01 focusing on delivering measurable business value and robust technical improvements across two Nordic SDKs. The month emphasized increasing benchmark reliability, expanding test coverage, and strengthening CI validation to accelerate feature delivery and reduce risk in production deployments.
Concise monthly summary for 2025-01 focusing on delivering measurable business value and robust technical improvements across two Nordic SDKs. The month emphasized increasing benchmark reliability, expanding test coverage, and strengthening CI validation to accelerate feature delivery and reduce risk in production deployments.
Month: 2024-12 — Focused on reliability, stability, and governance for the NordicBuilder/sdk-nrf repository. Completed key bug fixes for sensor data integrity and test suite stability, plus governance updates to streamline code reviews.
Month: 2024-12 — Focused on reliability, stability, and governance for the NordicBuilder/sdk-nrf repository. Completed key bug fixes for sensor data integrity and test suite stability, plus governance updates to streamline code reviews.
November 2024 delivered a focused set of performance, stability and CI improvements across NordicBuild�r/sdk-nrf and kholia/zephyr. Key work included a comprehensive power and current consumption benchmarks suite extended across peripherals (qdec, adc, i2c, spi, timer, uart, flash) with multicore support for NRF54H20, plus CI readiness and test/spec updates. Added LPUART sample verification and fixtures to enable end‑to‑end LPUART validation. Expanded quarantine_zephyr tooling to enhance newlib thread-safety checks and llext support. Strengthened CI coverage for current consumption benchmarks and fixed hardware test reliability through targeted overlay/config changes (NRF54H20 FLPR core) and NRF54L15DK stability improvements.
November 2024 delivered a focused set of performance, stability and CI improvements across NordicBuild�r/sdk-nrf and kholia/zephyr. Key work included a comprehensive power and current consumption benchmarks suite extended across peripherals (qdec, adc, i2c, spi, timer, uart, flash) with multicore support for NRF54H20, plus CI readiness and test/spec updates. Added LPUART sample verification and fixtures to enable end‑to‑end LPUART validation. Expanded quarantine_zephyr tooling to enhance newlib thread-safety checks and llext support. Strengthened CI coverage for current consumption benchmarks and fixed hardware test reliability through targeted overlay/config changes (NRF54H20 FLPR core) and NRF54L15DK stability improvements.
Month: 2024-10 — NordicBuilder/sdk-nrf: Delivered hardware flow-control configuration support across nRF54 and nRF52x boards, expanded configuration snippets to cover nRF52840/52832, and introduced a quarantine entry for sensor_hub ML app downloads to isolate a known issue. These changes improve cross-board UART reliability, accelerate onboarding of new boards, and reduce deployment risk for ML applications. Key business outcomes include broader hardware compatibility, fewer downstream issues, and clear traceability through commit messages and Jira linkage. Technologies demonstrated include YAML-based configuration, version-controlled code snippets, and cross-team collaboration with issue tracking.
Month: 2024-10 — NordicBuilder/sdk-nrf: Delivered hardware flow-control configuration support across nRF54 and nRF52x boards, expanded configuration snippets to cover nRF52840/52832, and introduced a quarantine entry for sensor_hub ML app downloads to isolate a known issue. These changes improve cross-board UART reliability, accelerate onboarding of new boards, and reduce deployment risk for ML applications. Key business outcomes include broader hardware compatibility, fewer downstream issues, and clear traceability through commit messages and Jira linkage. Technologies demonstrated include YAML-based configuration, version-controlled code snippets, and cross-team collaboration with issue tracking.

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