JetBrains/Avalonia
Dec 2024 – Aug 2025
2 Months active
Languages Used
C#
Technical Skills
Core DevelopmentAvalonia UIMemory ManagementPerformance OptimizationUI DevelopmentVirtualization
Alexander Marek
PROFILE
Alexander Marek
Contributed to JetBrains/Avalonia by developing a virtualization performance feature and resolving a core startup sequencing bug. Implemented the CacheLength property in VirtualizingStackPanel using C# to buffer extra viewport space, which reduced Measure and Arrange cycles and lowered garbage collection pressure on Android and iOS devices, resulting in smoother scrolling for complex item views. Addressed a startup callback ordering issue by correcting the Delegate.Combine sequence, ensuring AfterPlatformServicesSetup callbacks executed as intended and improving application reliability. Work demonstrated strong skills in Avalonia UI, memory management, and performance optimization, with a focus on maintainable, cross-platform UI development and core infrastructure improvements.
Overall Statistics
Feature vs Bugs
50%Features
Repository Contributions
2Total
Bugs
1
Commits
2
Features
1
Lines of code
1,619
Activity Months2
Your Network
61 peopleWork History
August 2025
1 Commits • 1 Features
Aug 1, 20252025-08 Monthly Summary: Focused on performance optimization for Avalonia’s virtualization, delivering a feature and related improvements that enhance user experience and device compatibility. Implemented CacheLength to VirtualizingStackPanel to buffer extra viewport space, reducing costly Measure/Arrange cycles and GC pressure on constrained devices (Android/iOS). This change enables smoother scrolling for complex item views and scales to larger lists without compromising responsiveness.
1 Commits • 1 Features
Aug 1, 20252025-08 Monthly Summary: Focused on performance optimization for Avalonia’s virtualization, delivering a feature and related improvements that enhance user experience and device compatibility. Implemented CacheLength to VirtualizingStackPanel to buffer extra viewport space, reducing costly Measure/Arrange cycles and GC pressure on constrained devices (Android/iOS). This change enables smoother scrolling for complex item views and scales to larger lists without compromising responsiveness.
August 2025
December 2024
1 Commits
Dec 1, 2024December 2024 performance summary for JetBrains/Avalonia contributions. Core focus: fix startup callback ordering between AfterApplicationSetup and AfterPlatformServicesSetup, restoring intended startup sequence, improving reliability and maintainability. Work tied to issues #17675/#17676 with commit 7210eff63344a6d6e2e149196039d63d6fc30704.
December 2024
1 Commits
Dec 1, 2024December 2024 performance summary for JetBrains/Avalonia contributions. Core focus: fix startup callback ordering between AfterApplicationSetup and AfterPlatformServicesSetup, restoring intended startup sequence, improving reliability and maintainability. Work tied to issues #17675/#17676 with commit 7210eff63344a6d6e2e149196039d63d6fc30704.
Activity
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Quality Metrics
Correctness100.0%
Maintainability100.0%
Architecture100.0%
Performance100.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
C#
Technical Skills
Avalonia UICore DevelopmentMemory ManagementPerformance OptimizationUI DevelopmentVirtualization
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