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Jan Müller

PROFILE

Jan Müller

Jan Müller contributed to the nrfconnect/sdk-nrf and NordicBuilder/sdk-nrf repositories by developing and stabilizing Bluetooth features for Nordic’s latest hardware platforms. He implemented MRAM awake configuration to reduce Bluetooth latency on nRF54H20, enhanced time synchronization support for the NRF54h series, and improved device discovery by refining RSSI filtering logic. Jan addressed radio timeslot reliability through targeted documentation and practical workarounds, and stabilized cross-core data transport in ISO Time Sync samples on nRF53. His work combined C programming, RTOS configuration, and device tree management, demonstrating a methodical approach to embedded systems reliability, maintainability, and hardware compatibility across evolving Nordic platforms.

Overall Statistics

Feature vs Bugs

38%Features

Repository Contributions

10Total
Bugs
5
Commits
10
Features
3
Lines of code
712
Activity Months5

Work History

November 2025

1 Commits

Nov 1, 2025

2025-11 monthly summary focused on stabilizing the ISO Time Sync sample on the nRF53 platform to improve cross-core data transport reliability and reduce packet flushing in the network core. No new feature deliveries this month; the emphasis was on stability, reliability, and maintainability of time-sync data paths. The work strengthens core data transport with the IPC_RADIO on the network core and lays groundwork for more deterministic behavior in time-sensitive samples.

September 2025

1 Commits • 1 Features

Sep 1, 2025

September 2025 (Month: 2025-09) - Focused on stabilizing radio timeslot behavior for NRF54L/NRF54H platforms within the sdk-nrf repo by delivering clear documentation and a practical workaround. Key deliverable: DRGN-26138 known-issue documentation with an explicit workaround to clear specific radio events after timeslot usage, reducing undefined behavior risk and post-release debugging. This work enhances developer guidance, reduces field risk, and aligns with platform reliability goals across NRF54L/L/H series. Commit 2a99641a0b885a795056cce7ca16672173df110d (doc: Document known issue for DRGN-26138) was authored and signed off by Jan Müller to ensure traceability and governance.

March 2025

3 Commits

Mar 1, 2025

March 2025 Monthly Summary (nrfconnect/sdk-nrf): Delivered Bluetooth reliability improvements focused on device discovery and sampling robustness, with enhanced diagnostics and documentation to support maintainability and faster iteration. Key features delivered and bugs fixed: - Bluetooth device discovery improvement (RSSI filter removal): Removed hardcoded RSSI distance check in the Bluetooth scanning sample to improve local device discoverability; now relies on device name filtering. This fixes issues where the RSSI gate blocked connections to nearby devices. (Commit: 6e7c8eb2a029392427a22ce8780486c8fd5d6dc9) - Timeslot management robustness in Bluetooth sample: Enhanced timeslot diagnostics and reliability by adding an explicit error message for overstayed timeslots and increasing the default timeslot overhead to prevent overstays and assertion failures on certain devices. Documentation updated accordingly. (Commits: 1110f8d9be8aff404b376ec42474af062c61a060; b2ec18e93f937616c38aa9b54fc70ce1f7db8e2b) Overall impact and accomplishments: - Improved local device discoverability and connection reliability in Bluetooth workflows, reducing flaky behavior in nearby-device scenarios. - Increased stability and predictability of Bluetooth sampling across device varieties through better diagnostics and conservative timing parameters. - Documentation improvements support faster onboarding and easier maintenance for Bluetooth-related samples. Technologies/skills demonstrated: - Bluetooth sampling and device discovery, RSSI filtering concepts, and timeslot management. - Diagnostic messaging, error handling, and resilience in edge-case scenarios. - Code hygiene, commit traceability, and documentation practices.

December 2024

4 Commits • 1 Features

Dec 1, 2024

December 2024 monthly performance summary for Nordic SDKs focusing on hardware compatibility, reliability, and version discipline across two major repos: NordicBuilder/sdk-nrf and nrfconnect/sdk-nrfxlib. Key outcomes include enabling NRF54h support for time synchronization samples, consolidating MPSL library revision across manifests and binaries, and fixing BIS timing and Channel Sounding calculations. The work improves hardware support for newer Nordic devices, reduces integration risk, and accelerates time-to-market for time-critical features. Deliverables also include updated configurations and documentation to reflect hardware resource usage and dependencies, demonstrating strong cross-cutting skills in build systems, device configuration, and version management.

November 2024

1 Commits • 1 Features

Nov 1, 2024

Monthly summary for 2024-11 focusing on feature delivery and technical achievements in the NordicBuilder/sdk-nrf repository.

Activity

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Quality Metrics

Correctness86.0%
Maintainability86.0%
Architecture78.0%
Performance74.0%
AI Usage20.0%

Skills & Technologies

Programming Languages

CCMakeRSTYAML

Technical Skills

BluetoothBluetooth Low EnergyBluetooth developmentC ProgrammingC programmingDevice Tree ConfigurationDocumentationEmbedded SystemsFirmware DevelopmentRTOSRTOS ConfigurationVersion Controlembedded systems

Repositories Contributed To

3 repos

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

nrfconnect/sdk-nrf

Mar 2025 Nov 2025
3 Months active

Languages Used

CRST

Technical Skills

BluetoothC ProgrammingEmbedded SystemsFirmware DevelopmentRTOSDocumentation

NordicBuilder/sdk-nrf

Nov 2024 Dec 2024
2 Months active

Languages Used

CCMakeRST

Technical Skills

BluetoothEmbedded SystemsRTOS ConfigurationBluetooth Low EnergyDevice Tree ConfigurationRTOS

nrfconnect/sdk-nrfxlib

Dec 2024 Dec 2024
1 Month active

Languages Used

CRSTYAML

Technical Skills

Bluetooth Low EnergyEmbedded SystemsFirmware DevelopmentVersion Control