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Jack Sangdahl

PROFILE

Jack Sangdahl

Jack contributed to the qmk_firmware repository by modernizing keyboard firmware and configuration management for a range of embedded systems. He migrated legacy keymaps and configurations to a data-driven JSON format, standardized aliases, and consolidated build and bootloader processes, reducing maintenance overhead and improving cross-board consistency. Using C and Python, Jack refactored CLI prompts for better user experience, clarified documentation to streamline onboarding, and updated driver code to align with evolving GPIO APIs. His work addressed hardware compatibility, simplified developer workflows, and enhanced documentation quality, demonstrating depth in firmware development, configuration management, and embedded systems engineering across multiple keyboard families.

Overall Statistics

Feature vs Bugs

82%Features

Repository Contributions

24Total
Bugs
2
Commits
24
Features
9
Lines of code
14,571
Activity Months6

Work History

August 2025

5 Commits • 2 Features

Aug 1, 2025

Monthly summary for 2025-08 focusing on qmk/qmk_firmware; delivered two major initiatives: unified keyboard configuration standardization with data-driven migrations, and Lotus58 build/bootloader simplification. The work included migrating keymaps to JSON, updating aliases, moving common settings to top-level, deprecating outdated configurations, and enhancing documentation to align with firmware standards. Also fixed a serial speed DD configuration during migrations. These changes reduce maintenance burden, improve consistency across keyboard families, and streamline builds and flashing for users. Technologies demonstrated include data-driven configuration design, JSON migrations, refactoring, alias management, build/bootloader consolidation, and documentation discipline.

July 2025

13 Commits • 4 Features

Jul 1, 2025

July 2025 monthly summary for qmk/qmk_firmware: Delivered broad modernization and standardization across Helix and Bastardkb keyboard families, expanded SPI-driven peripheral support, and improved developer onboarding through documentation upgrades. The work focused on maintainability, cross-board consistency, and faster feature delivery, with tangible config migrations and refactors across multiple repos.

April 2025

2 Commits

Apr 1, 2025

April 2025 monthly summary for qmk/qmk_firmware focusing on RGB Matrix keymap cleanup and bug fixes for Sofle and Beiwagon, consolidation of firmware revisions, and documentation cleanup. Delivered improvements reduce RGB Matrix coordinate errors, enhance cross-board consistency, and improve onboarding for contributors.

March 2025

2 Commits • 2 Features

Mar 1, 2025

Concise monthly summary for 2025-03 focusing on key architectural improvements and cross-model consistency in QMK firmware. Delivered two major features with associated bug fixes, improving hardware compatibility, reduce maintenance burden, and strengthening the GPIO API for future driver support.

January 2025

1 Commits

Jan 1, 2025

January 2025 monthly summary focusing on documentation quality and developer experience for the Mod Tap MT() macro in the srwi/qmk_firmware repository. Delivered a targeted documentation clarification to ensure the mod argument is described as PREFixed with MOD_ (not KC_), reducing misconfigurations and onboarding friction. The work was a single, scoped documentation fix with measurable business impact: improved accuracy, faster contributor onboarding, and reduced support questions.

December 2024

1 Commits • 1 Features

Dec 1, 2024

December 2024 — Delivered a UX-focused refactor of the qmk_firmware "new-keymap" prompt to simplify the keymap naming flow. The prompt text was streamlined and the unnecessary GitHub username field removed, centering on the keymap name. Commit 0228806ae8d1f12fc2c254b310c73076cfbde0d5 ("Change `new-keymap` keymap name prompt (#24701)" ). This reduces user friction, accelerates keymap creation, and improves onboarding for new users.

Activity

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Quality Metrics

Correctness89.6%
Maintainability88.8%
Architecture87.8%
Performance81.2%
AI Usage20.0%

Skills & Technologies

Programming Languages

CHjsonJSONJSON SchemaMakefileMarkdownPython

Technical Skills

C ProgrammingCLI DevelopmentConfiguration ManagementDocumentationDriver DevelopmentEmbedded SystemsFirmware DevelopmentHardware ConfigurationHardware InteractionKeyboard ConfigurationKeyboard CustomizationKeyboard FirmwarePythonRefactoring

Repositories Contributed To

2 repos

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

qmk/qmk_firmware

Mar 2025 Aug 2025
4 Months active

Languages Used

CHjsonJSONMakefileMarkdownJSON SchemaPython

Technical Skills

Configuration ManagementDriver DevelopmentEmbedded SystemsFirmware DevelopmentHardware InteractionKeyboard Customization

srwi/qmk_firmware

Dec 2024 Jan 2025
2 Months active

Languages Used

PythonMarkdown

Technical Skills

CLI DevelopmentPythonDocumentation

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