JetBrains/Avalonia
Nov 2024 – Sep 2025
6 Months active
Languages Used
C#XAML
Technical Skills
Layout ManagementUI DevelopmentUnit TestingCross-Platform DevelopmentMemory ManagementNative Development
Dan Walmsley
PROFILE
Dan Walmsley
Dan Walmsley contributed to JetBrains/Avalonia by developing new UI features and addressing complex stability and performance issues in cross-platform desktop applications. He delivered enhancements such as SplitView pane positioning with updated XAML and MVVM support, and implemented targeted bug fixes for layout event signaling and macOS memory management. Dan’s work involved deep refactoring of event handling and control templating, optimizing inherited property change notifications to reduce memory allocations and improve runtime responsiveness. Using C#, XAML, and benchmarking techniques, he ensured robust unit test coverage and alignment with UWP standards, demonstrating thorough engineering and a focus on long-term framework reliability.
Overall Statistics
Feature vs Bugs
33%Features
Repository Contributions
6Total
Bugs
4
Commits
6
Features
2
Lines of code
865
Activity Months6
Your Network
61 people
Work History
September 2025
1 Commits • 1 Features
Sep 1, 2025September 2025 performance wrap-up for JetBrains/Avalonia: Delivered the SplitView Pane Positioning feature (Top/Bottom) with updated XAML and ViewModel support and refined control template and styling to render and animate correctly across orientations, display modes, and themes. This work enhances UI customization, consistency across themes, and lays groundwork for broader layout flexibility across the project.
1 Commits • 1 Features
Sep 1, 2025September 2025 performance wrap-up for JetBrains/Avalonia: Delivered the SplitView Pane Positioning feature (Top/Bottom) with updated XAML and ViewModel support and refined control template and styling to render and animate correctly across orientations, display modes, and themes. This work enhances UI customization, consistency across themes, and lays groundwork for broader layout flexibility across the project.
September 2025
August 2025
1 Commits
Aug 1, 2025August 2025: Focused on UI stability in JetBrains/Avalonia. Delivered a targeted bug fix for SplitView when switching DisplayMode to inline, added unit tests, and tightened disposal of input subscriptions to prevent leaks. The work reduces UI regressions and improves user experience when toggling display modes.
August 2025
1 Commits
Aug 1, 2025August 2025: Focused on UI stability in JetBrains/Avalonia. Delivered a targeted bug fix for SplitView when switching DisplayMode to inline, added unit tests, and tightened disposal of input subscriptions to prevent leaks. The work reduces UI regressions and improves user experience when toggling display modes.
March 2025
1 Commits • 1 Features
Mar 1, 2025March 2025 (2025-03) focused on delivering a targeted performance optimization for Avalonia's inherited property change notifications, with benchmarking to validate improvements. No high-severity bugs fixed this period; changes are isolated to the notification pathway and its benchmarks, contributing to improved runtime responsiveness in UI scenarios with inherited values.
1 Commits • 1 Features
Mar 1, 2025March 2025 (2025-03) focused on delivering a targeted performance optimization for Avalonia's inherited property change notifications, with benchmarking to validate improvements. No high-severity bugs fixed this period; changes are isolated to the notification pathway and its benchmarks, contributing to improved runtime responsiveness in UI scenarios with inherited values.
March 2025
January 2025
1 Commits
Jan 1, 2025January 2025 monthly summary for JetBrains/Avalonia. Delivered a macOS rendering stability fix by caching the initial render scaling value during initialization to prevent fluctuations caused by the native scaling property. This stabilizes UI rendering on macOS, improves cross-platform consistency, and reduces support overhead.
January 2025
1 Commits
Jan 1, 2025January 2025 monthly summary for JetBrains/Avalonia. Delivered a macOS rendering stability fix by caching the initial render scaling value during initialization to prevent fluctuations caused by the native scaling property. This stabilizes UI rendering on macOS, improves cross-platform consistency, and reduces support overhead.
December 2024
1 Commits
Dec 1, 2024December 2024 monthly summary for JetBrains/Avalonia focused on stability improvements and a critical memory leak fix in the macOS native window subsystem.
1 Commits
Dec 1, 2024December 2024 monthly summary for JetBrains/Avalonia focused on stability improvements and a critical memory leak fix in the macOS native window subsystem.
December 2024
November 2024
1 Commits
Nov 1, 2024In November 2024, focus was placed on stabilizing the UI layout event signaling in JetBrains/Avalonia. Delivered a critical bug fix to ensure EffectiveViewPortChanged is emitted after layout passes when a control with an existing valid layout is added to the visual tree, preventing missed viewport updates and inconsistent UI behavior. Updated the LayoutManager event logic to guarantee consistent viewport-change signaling, aligning with UWP standards. Expanded test coverage with unit tests validating the new behavior against UWP expectations to prevent regressions. These changes improve layout reliability, reduce debugging time for viewport-related issues, and increase developer trust in the framework’s UI signaling.
November 2024
1 Commits
Nov 1, 2024In November 2024, focus was placed on stabilizing the UI layout event signaling in JetBrains/Avalonia. Delivered a critical bug fix to ensure EffectiveViewPortChanged is emitted after layout passes when a control with an existing valid layout is added to the visual tree, preventing missed viewport updates and inconsistent UI behavior. Updated the LayoutManager event logic to guarantee consistent viewport-change signaling, aligning with UWP standards. Expanded test coverage with unit tests validating the new behavior against UWP expectations to prevent regressions. These changes improve layout reliability, reduce debugging time for viewport-related issues, and increase developer trust in the framework’s UI signaling.
Activity
Loading activity data...
Quality Metrics
Correctness91.6%
Maintainability86.6%
Architecture86.6%
Performance86.6%
AI Usage20.0%
Skills & Technologies
Programming Languages
C#XAML
Technical Skills
BenchmarkingC#Code RefactoringControl DevelopmentControl TemplatingCross-Platform DevelopmentDesktop DevelopmentEvent HandlingLayout ManagementMVVMMemory ManagementNative DevelopmentPerformance OptimizationUI DevelopmentUI Frameworks
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline