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brettfiedler

PROFILE

Brettfiedler

Worked extensively on the phetsims/membrane-transport repository, delivering 32 features and resolving 12 bugs over 10 months. Focused on enhancing simulation fidelity, accessibility, and user experience through UI/UX improvements, audio integration, and visual asset updates. Applied JavaScript and TypeScript for front-end development, leveraging SVG manipulation and color theory to refine interactive elements and educational clarity. Contributed to documentation and project management in the phetsims/phet-info repository, introducing milestone tracking and checklist enhancements to strengthen release governance. Demonstrated a methodical approach to parameter tuning, internationalization, and quality assurance, resulting in maintainable code, improved onboarding, and more accessible, reliable simulation experiences.

Overall Statistics

Feature vs Bugs

73%Features

Repository Contributions

87Total
Bugs
12
Commits
87
Features
32
Lines of code
79,652
Activity Months10

Work History

March 2026

1 Commits • 1 Features

Mar 1, 2026

March 2026 monthly summary for phetsims/phet-info: Focused on documentation accessibility enhancement for core description options by improving markdown formatting for readability and accessibility. The change was implemented via commit 11e0a933410c6af8f46b97efdae13023082236f3 with a clear description of markdown formatting improvements. This work improves end-user documentation accessibility, reduces confusion for new contributors, and aligns docs with accessibility best practices. No major bugs fixed in this period for this repository. Overall, the update contributes to better documentation quality, maintainability, and faster onboarding.

December 2025

1 Commits • 1 Features

Dec 1, 2025

December 2025: Delivered milestone-tracking enhancements in phet-info to improve simulation sub-epic planning and deadlines. No major bugs fixed this month. Result: better governance, earlier risk detection, and clearer progress reporting, enabling more reliable delivery to stakeholders.

November 2025

1 Commits • 1 Features

Nov 1, 2025

In November 2025, delivered a Release Process Checklist Enhancement for phet-info, updating simulation and republication checklists to cover new features and requirements for upcoming releases. The update ensures comprehensive coverage of design, scope, and publication processes, improving release readiness, governance, and traceability.

October 2025

4 Commits • 2 Features

Oct 1, 2025

October 2025: Delivered visual asset updates for Membrane-Transport and clarified Core Voicing within release notes to strengthen documentation quality and user guidance. Business value delivered includes clearer onboarding, improved presentation materials, and enhanced release transparency. No major bugs fixed this month; effort focused on asset management, documentation hygiene, and release-notes governance. Technologies and skills demonstrated include Git-based asset management, visualization asset work, documentation practices, and release-management.

September 2025

20 Commits • 4 Features

Sep 1, 2025

September 2025 monthly summary focusing on membrane-transport and phet-info work, with emphasis on accessibility, UI clarity, documentation, and release readiness. The month delivered tangible business value through accessible UI improvements, clearer interaction cues, and strengthened QA processes, while advancing release assets and documentation across two repositories.

August 2025

26 Commits • 8 Features

Aug 1, 2025

August 2025 monthly summary for phetsims/membrane-transport: Delivered a broad set of enhancements across audio, visuals, and UI, coupled with extensive bug fixes, resulting in clearer guidance, more reliable interactions, and a polished user experience across the membrane-transport feature set.

July 2025

25 Commits • 11 Features

Jul 1, 2025

July 2025 highlights for membrane-transport: delivered a UI/icon refresh, language and string refinements across UI and charts, audio balance improvements, and targeted fixes to glucose fade and readouts. Key deliverables include new screen/home/nav icons, refined barchart language, improved pump/readout visuals, and UI image/layout updates, plus code-quality improvements. These changes increase usability, accuracy of readouts, and overall user engagement, while strengthening the maintainability of the codebase.

June 2025

1 Commits • 1 Features

Jun 1, 2025

June 2025: Delivered targeted gradient bias parameter tuning for MembraneTransportModel in phetsims/membrane-transport to improve gradient-driven particle movement accuracy. Key changes reduced BIAS_THRESHOLD from 0.1 to 0.05 and GRADIENT_BIAS_STRENGTH from 1 to 0.25. Change linked to issue https://github.com/phetsims/membrane-transport/issues/201. No major bugs fixed this month. Impact: enhanced fidelity of gradient-based simulations and more reliable calibration for downstream analyses. Skills demonstrated: gradient-based modeling, parameter tuning, version control, issue tracing, and cross-team collaboration.

April 2025

7 Commits • 2 Features

Apr 1, 2025

April 2025 monthly summary for phetsims/membrane-transport: Delivered two major feature sets with targeted visual/UI improvements and addressed key rendering edge cases to enhance educational clarity and user experience. The work focused on visual fidelity of the membrane transport simulation, UI readability, and more realistic particle dynamics, underpinned by careful commit-level changes and asset updates.

February 2025

1 Commits • 1 Features

Feb 1, 2025

February 2025 monthly summary focusing on key accomplishments in the membrane-transport repo. Delivered targeted UI improvement by enhancing accordion labels to improve clarity and user understanding without altering core functionality. No major bugs fixed this period; bug-fix activity is planned for the next cycle. The change is minimal-risk and aligns with ongoing UI/UX improvements and maintainability efforts.

Activity

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Quality Metrics

Correctness94.2%
Maintainability94.8%
Architecture92.6%
Performance92.2%
AI Usage20.0%

Skills & Technologies

Programming Languages

AIJavaScriptMarkdownPostScriptSVGTypeScriptXMLYAMLyaml

Technical Skills

AccessibilityAsset ManagementAudio EngineeringAudio IntegrationCanvas RenderingColor TheoryConfiguration ManagementDocumentationFront End DevelopmentFront-End DevelopmentFront-end DevelopmentFrontend DevelopmentGame DevelopmentGraphic DesignGraphics Design

Repositories Contributed To

2 repos

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

phetsims/membrane-transport

Feb 2025 Oct 2025
7 Months active

Languages Used

JavaScriptSVGTypeScriptXMLYAMLyamlAIMarkdown

Technical Skills

Front End DevelopmentCanvas RenderingFrontend DevelopmentGame DevelopmentImage ScalingJavaScript

phetsims/phet-info

Sep 2025 Mar 2026
4 Months active

Languages Used

Markdown

Technical Skills

AccessibilityDocumentationQuality Assurancechecklist creationdocumentationproject management