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Niels van Velzen

PROFILE

Niels Van Velzen

Over thirteen months, Niels Dantuma engineered core features and stability improvements for the jellyfin/jellyfin-androidtv repository, focusing on modernizing the Android TV experience. He migrated major UI surfaces to Jetpack Compose, unified navigation, and introduced advanced playback controls, enhancing maintainability and user experience. Leveraging Kotlin and Java, he implemented robust media streaming, refined API integrations, and centralized interaction telemetry for better analytics. His work included modularizing timed event handling, optimizing performance with preloading and caching, and ensuring accessibility through localization and device compatibility. The depth of his contributions is reflected in the seamless, scalable architecture and consistently reliable user-facing features.

Overall Statistics

Feature vs Bugs

61%Features

Repository Contributions

260Total
Bugs
87
Commits
260
Features
136
Lines of code
28,799
Activity Months13

Your Network

883 people

Work History

April 2026

5 Commits • 2 Features

Apr 1, 2026

April 2026 (2026-04) – Jellyfin Android TV delivered two stability and UX-focused features in jellyfin/jellyfin-androidtv, with no explicit major bug fixes documented for the month. The work focused on refactoring for UI reliability and centralized interaction telemetry to enable better UX analytics and maintainability.

March 2026

5 Commits • 2 Features

Mar 1, 2026

March 2026 jellyfin/jellyfin-androidtv delivered targeted improvements to reduce playback latency, modernize the UI, and stabilize remote interactions. Key outcomes include preloading the next media item to minimize wait times, a Jetpack Compose-based UI foundation with navigation simplification, and a fix for remote-controlled screensaver dismissal. These changes enhance user satisfaction on TV devices, improve performance metrics, and reduce maintenance complexity by simplifying code paths and removing redundant theming.

February 2026

12 Commits • 9 Features

Feb 1, 2026

February 2026 monthly summary for jellyfin/jellyfin-androidtv: Delivered key features to strengthen streaming reliability, media attribute handling, and modularization; fixed critical UI and playback checks; and evolved the architecture to support timed events and segment-based playback. These changes improve runtime stability, maintainability, and business value by enabling accurate content-type handling, CI consistency, and scalable feature work.

January 2026

22 Commits • 14 Features

Jan 1, 2026

January 2026 monthly summary for Jellyfin AndroidTV and Jellyfin. Delivered key UI/UX improvements, modernization, and performance enhancements across the Android TV app and core project. Notable outcomes include: streamlined navigation with settings sliding transitions and animated dialogs, a consistent In-App Screensaver implemented via DialogBase, and shared transitions for RouterContent. Advanced playback settings migrated to Compose, enabling more flexible, declarative UI. Modernization efforts include AGP9 migration, RTL/LTR support in ToolbarLayout, and token-based UI updates for color and spacing. Performance improvements include increasing the MediaItems cache to 10 for smoother scrolling. These changes reduce user friction, improve maintainability, and provide a solid foundation for future features and performance improvements.

December 2025

51 Commits • 30 Features

Dec 1, 2025

December 2025 highlights: Delivered a sweeping Compose-based UI migration for Jellyfin Android TV settings and related surfaces (Telemetry, Developer, Licenses, server/user, and home/library/live TV guide), enabling unified UX and faster iteration. Implemented Settings navigation and initial parameter support in the router, with ProvideRouter improvements for defaultRouteParameters. Modernized the design system with tokens and new UI primitives (SettingsColumn, RangeControl, ListControl base, ProfilePicture) to accelerate feature delivery and ensure consistency. Expanded media capabilities (FMP4 transcoding, AAC-over-HLS for music) and AboutLibraries integration, plus build/readme improvements and CI workflow enhancements. Improved reliability and quality with better error rendering (ListMessage), preventing seeking when duration is unknown, and removal of deprecated preferences.

November 2025

21 Commits • 11 Features

Nov 1, 2025

During 2025-11, delivered targeted features and stability fixes across Jellyfin Android TV and contributed to project hygiene and contributor experience. Major user-facing improvements include ASS direct subtitle playback, improved external playback subtitle handling, and broader device compatibility. In addition, several crash and stability fixes landed on Android TV and Fire OS, while CI and templates were updated to ensure consistent quality across releases. These changes reduce support needs, improve playback reliability, and accelerate safe releases.

October 2025

27 Commits • 11 Features

Oct 1, 2025

October 2025 monthly summary for Jellyfin projects: Delivered high-impact features across Jellyfin Android TV and Jellyfin.org with a focus on billing automation, server management, build security, API/SDK modernization, and server compatibility. Implemented end-to-end billing flow, improved device management, and tightened playback resilience while laying groundwork for the Android TV 0.19 release.

September 2025

15 Commits • 4 Features

Sep 1, 2025

September 2025 summary focusing on stabilizing Jellyfin across Android TV, site, and core services, delivering stability, performance improvements, localization accuracy, and enhanced development feedback loops. Key work spanned Android TV navigation, subtitle handling, localization cleanups, crash reporting, and CI/core migrations, driving better user experience and developer velocity.

August 2025

33 Commits • 23 Features

Aug 1, 2025

August 2025 monthly summary focused on Android TV and Jellyfin core improvements, delivering a modernized playback experience, platform-aligned updates, and accessibility enhancements. The work emphasized business value through enhanced media playback reliability, richer UX, and broader user reach.

July 2025

21 Commits • 6 Features

Jul 1, 2025

Concise monthly summary for 2025-07 focusing on key feature deliveries, bug fixes, and technical improvements across Jellyfin Android TV and Web front-ends. Highlighted outcomes emphasize business value through stability, UX improvements, and maintainable code quality.

June 2025

19 Commits • 10 Features

Jun 1, 2025

June 2025 performance summary: Delivered significant stability improvements and feature enhancements across jellyfin/jellyfin-androidtv and jellyfin.org. Upgraded core SDK to 1.7.0-beta.3, refined playback-related APIs, and modernized UI components to improve developer velocity and user experience. Implemented CI/document reliability improvements and reinforced code quality through linting and compile issue resolutions.

May 2025

10 Commits • 5 Features

May 1, 2025

Month: 2025-05 — Jellyfin Android TV delivered tangible improvements in reliability, UX, and maintainability. Key features delivered include a unified image loading model, standardized boxset queue sorting, immersive video playback enhancements (libass subtitles rendering and Now Playing UI with cover art and lyrics), media playback system improvements (AndroidMediaService action and notification badge refinements), and UI stability/maintenance improvements (nullability fixes, Compose focus management updates, and Koin removal in playback). Major bugs fixed included stability fixes for presenters due to nullability issues, updated Compose focus handling to address deprecations, and a screensaver loop prevention when no items are available. These changes reduce risk, improve user experience across devices, and simplify future work.

April 2025

19 Commits • 9 Features

Apr 1, 2025

April 2025 performance summary: Delivered stability improvements, API clarity, and UI/UX enhancements across Jellyfin core, Android TV, and Chromecast. Focused on reliability, maintainability, and user experience with targeted fixes and API migrations, while enabling smoother builds and clearer API consumption for partners and clients.

Activity

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Quality Metrics

Correctness92.6%
Maintainability90.4%
Architecture88.6%
Performance86.2%
AI Usage22.8%

Skills & Technologies

Programming Languages

C#CSSGradleJSONJavaJavaScriptKotlinMarkdownMjsSQL

Technical Skills

API DevelopmentAPI IntegrationAPI developmentAndroidAndroid DevelopmentAndroid developmentAsynchronous ProgrammingAudio ProcessingBackend DevelopmentBug FixingBuild ConfigurationC#C# developmentCI/CDCallback Handling

Repositories Contributed To

5 repos

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

jellyfin/jellyfin-androidtv

Apr 2025 Apr 2026
13 Months active

Languages Used

JavaKotlinTOMLGradleXMLMarkdownYAML

Technical Skills

API IntegrationAndroid DevelopmentBug FixingDependency InjectionDependency ManagementExoPlayer

jellyfin/jellyfin

Apr 2025 Jan 2026
4 Months active

Languages Used

C#JSONSQL

Technical Skills

API DevelopmentBackend DevelopmentC#backend developmentlocalizationsoftware development

jellyfin/jellyfin.org

Jun 2025 Dec 2025
5 Months active

Languages Used

JavaScriptTypeScriptYAMLMarkdownJSONCSS

Technical Skills

CI/CDCode QualityConfiguration ManagementDevelopment Environment ManagementDocumentationESLint

jellyfin/jellyfin-web

Jul 2025 Jul 2025
1 Month active

Languages Used

CSSJavaScriptMjsTypeScript

Technical Skills

API IntegrationCode StandardizationFront End DevelopmentFront-end DevelopmentFrontend DevelopmentReact

jellyfin/jellyfin-chromecast

Apr 2025 Dec 2025
2 Months active

Languages Used

TypeScript

Technical Skills

Code ModernizationRefactoringTypeScriptfront end development