EXCEEDS logo
Exceeds
Jan Starzak

PROFILE

Jan Starzak

Jan Starzak contributed extensively to the bbc/sofie-core repository, focusing on platform stability, UI modernization, and developer experience. Over 17 months, Jan delivered features such as timeline state management, onboarding automation, and robust CI/CD scaffolding, while resolving complex bugs in playout sequencing and publication state handling. Jan’s technical approach emphasized maintainable TypeScript and React code, leveraging asynchronous programming, dependency management, and automated testing to ensure reliability. By refactoring animation libraries, improving documentation, and standardizing configuration, Jan enhanced both runtime performance and team productivity. The work demonstrated depth in backend and frontend development, with careful attention to release quality and operational resilience.

Overall Statistics

Feature vs Bugs

53%Features

Repository Contributions

97Total
Bugs
24
Commits
97
Features
27
Lines of code
999,598
Activity Months17

Work History

March 2026

2 Commits • 1 Features

Mar 1, 2026

March 2026 monthly summary focusing on key accomplishments in bbc/sofie-core. Delivered project templates and CI/CD scaffolding to standardize issue reporting, feature requests, and PR workflows, with automated dependency updates and vulnerability scans to improve maintainability and security. Fixed RundownPlaylist Action Triggers: persistent filters bug, ensuring filters reset correctly and do not retain unnecessary state. These changes reduce operational overhead, improve release confidence, and demonstrate proficiency in CI/CD optimization, code quality, and bug hygiene.

February 2026

2 Commits

Feb 1, 2026

February 2026: Focused on stabilizing the Infinite Timeline Handling in the Playout System for multi-gateway deployments in bbc/sofie-core. Improvements address timing edge cases, ensure accurate start times for infinite pieces by accounting for control object start offsets, and tighten the timing control logic to reduce drift under cross-gateway scenarios. These changes enhance reliability during live playout and scale across gateways, laying groundwork for more predictable scheduling under peak loads.

January 2026

2 Commits • 1 Features

Jan 1, 2026

January 2026 focused on improving developer onboarding and system observability for Sofie Core. Key features delivered include Documentation Improvements for Sofie Core with enhanced First Start guidance, device integration docs, blueprint development notes, and installation steps. Major bugs fixed include Enhanced Debug Logging Visibility in Connection Manager by removing over-aggressive filtering, enabling richer error messages and easier debugging. Overall impact: faster onboarding, clearer guidance, and improved troubleshooting leading to reduced support time and smoother integration workflows. Technologies demonstrated: technical writing, observability improvements, targeted bug fixes, and clear release hygiene including traceable commits.

December 2025

1 Commits • 1 Features

Dec 1, 2025

December 2025 (2025-12) Monthly Summary for repository bbc/sofie-core focused on onboarding automation and dev-environment standardization. Key feature delivered: Developer Onboarding Enhancement—default VSCode settings now include meteor-lib, streamlining contributor setup. Implemented via commit eecd3221432577065c0327dfca15619ee029858a. No major bugs fixed this month in this repository. Overall impact: reduced onboarding friction for new contributors and ensured consistent tooling across the core codebase, accelerating collaboration and integration. Technologies and skills demonstrated: VSCode configuration automation, library integration (meteor-lib), repository standardization, and light-weight change-management via small, focused commits.

November 2025

1 Commits

Nov 1, 2025

November 2025 (bbc/sofie-core) monthly summary focusing on business value and technical achievements. Delivered a critical stability improvement in the Publication System by hardening handling of rapid document updates to avoid removal of non-existent documents during publication updates, addressing a race condition in mountedTriggers. This change improves publication state accuracy and robustness under bursty activity, reducing data inconsistency in published outputs and increasing reliability for downstream consumers. The fix is implemented in commit e38a9cba5ed7cd40066bd4d43e518eeeb1805394 with message: "fix(mountedTriggers): documents quickly being added and removed can cause non-existent documents in the publication to be removed".

October 2025

21 Commits • 4 Features

Oct 1, 2025

Monthly summary for 2025-10: Delivered UX and reliability improvements in the Sofie Core repository, completed comprehensive code quality and test enhancements, and strengthened maintainability with documentation and refactor work. Result: clearer navigation, more reliable playout timing, fewer regressions, and faster development cycles.

August 2025

2 Commits

Aug 1, 2025

2025-08: Stabilized live Presenter Screen and corrected rundown deactivation logic in bbc/sofie-core. Delivered two high-impact bug fixes that enhance data integrity and runtime reliability for live productions. Key changes: Presenter Screen values fixed by correcting heavy/light CSS class application on the over/under timer and adding necessary data subscriptions to fetch all required UI data; AfterBroadcastForm now deactivates rundown only when the processing loop is not running, preventing premature deactivation. Commit-level traceability provided via the fixes: bf84734d4dba07c5ba8e765416aa21e599bb530b and 1d6a22e64dd0f72131852c50b0008843ec38792a.

July 2025

1 Commits • 1 Features

Jul 1, 2025

July 2025: Documentation-focused month for bbc/sofie-core. Key outcome: branding/ownership documentation updated to reflect our GitHub ownership (from NRK's GitHub) with text-only changes; release links unchanged, preserving user access. No code functionality changes. Strengthened documentation accuracy, onboarding clarity, and repository hygiene, supporting consistent branding across the project and reducing support inquiries.

June 2025

5 Commits • 2 Features

Jun 1, 2025

June 2025: Focused release engineering and knowledge base improvements for bbc/sofie-core. Delivered Sofie Core Release 1.52.0 with dependency upgrades, changelog updates, and a small code quality lint fix; archived and organized versioned docs for 1.51.0 to improve API and developer reference accessibility.

May 2025

3 Commits • 2 Features

May 1, 2025

Monthly summary for 2025-05 focusing on delivering core platform reliability and maintainability for Sofie-core. Key features shipped include running container images with UID 1000 for Sofie deployments, ensuring consistent file permissions and user context (effective from Sofie version 1.52.0). In addition, Release 1.51.7 was prepared and released, including dependency bumps across packages and changelog updates. Timeline-state-resolver types were updated to 9.2.2 and timeline-state-resolver to 9.2.2, with the removal of a nightly fix version. These changes improve deployment security, compatibility with updated dependencies, and the upgrade path for customers. Documentation around the UID change was updated to reflect deployment behavior. No critical bugs fixed this month; the focus was on feature delivery, dependency management, and release engineering.

April 2025

3 Commits • 2 Features

Apr 1, 2025

April 2025 monthly summary for bbc/sofie-core. Focused on delivering timeline stability and compatibility upgrades that reduce stale-state risk and improve release readiness. Key features delivered: Timeline State Resolver Nightly Build Updates and Stale-State Fix; Superfly-Timeline Dependency Upgrade. Major bugs fixed: stale-state issues observed during testing resolved through nightly build updates and dependency upgrade. Overall impact: higher reliability of timeline features, improved testing stability, and faster production validation. Technologies/skills demonstrated: dependency management, nightly-build workflows, CI integration, and clear commit hygiene.

March 2025

14 Commits • 3 Features

Mar 1, 2025

March 2025 (2025-03) highlights for bbc/sofie-core: codebase modernization and stability improvements across UI and testing. Key achievements include migrating UI animations from deprecated velocity libraries to the Motion library (motion/react) across ModalDialog.tsx, NotificationCenterPanel.tsx, and related components; Shelf UI polish with narrower tabs, improved contrast, and ensured Shortcuts tab renders; resolved critical UI layering issues such as removing fixed height on dialogs and adjusting z-index to enable proper scrolling; stabilized the test suite by fixing typing issues and removing unnecessary mocks; expanded RFC documentation with clearer guidelines, use-cases, background context, and terminology. These changes improved user experience, reduced technical debt, and boosted development velocity.

February 2025

4 Commits • 1 Features

Feb 1, 2025

February 2025 for bbc/sofie-core: Delivered robust timeline handling for infinite pieces, improved test code quality by removing explicit TS file extensions, and refined migration defaults to apply options as overrides while preserving existing configurations. These changes enhance runtime accuracy, reduce maintenance overhead, and ensure safer migrations with preserved custom settings.

January 2025

1 Commits

Jan 1, 2025

Monthly summary for 2025-01 for the microsoft/meteor repository. Focused on stabilizing the developer experience by addressing a Windows-specific startup issue in the built-in dev MongoDB. Delivered a critical bug fix that quotes the MongoDB executable and data directory paths to prevent spaces in usernames from being misinterpreted as argument separators, thereby ensuring reliable startup across user profiles. This improvement reduces onboarding friction and strengthens local dev and CI reliability. Demonstrated technical proficiency in Windows path handling, argument quoting, and maintainable code changes through a Git-based fix.

December 2024

12 Commits • 2 Features

Dec 1, 2024

December 2024 monthly summary (bbc/sofie-core): Key features delivered: - Sofie Core 1.51.4 stability release with dependency updates across packages, plus UI/logging/font improvements and documentation polish. Included a minor code fix in NotificationsModelHelper and a changelog entry. - Observability enhancements in the job-worker: expanded logging and temporary debugging for segment ID handling to aid ingest and playout troubleshooting. - Playout Hold functionality fix: added a reset method and refactored activation/completion logic to ensure correct hold state management. Major bugs fixed: - Playout hold state bug resolved, restoring reliable hold behavior. - Logging correctness: ensured JSONL outputs have a non-object message field. - Small UI/font consistency fix (Roboto font restored after SCSS cleanup). Overall impact and accomplishments: - Improved system stability and maintainability with a structured release and thorough observability improvements. - Enhanced debugging capability for ingest/playout, reducing mean time to diagnose issues. - Clearer documentation and consistent styling, improving developer onboarding and ongoing maintenance. Technologies/skills demonstrated: - Release engineering and dependency management across a multi-package project. - TypeScript/SCSS cleanup and code quality improvements. - Observability instrumentation and targeted debugging support. - Documentation updates and changelog discipline.

November 2024

19 Commits • 5 Features

Nov 1, 2024

November 2024 performance highlights for bbc/sofie-core: Delivered key features, fixed critical bugs, and improved deployment reliability. Focused on subscription readiness UX, UI consistency, data handling, and stability across rundowns and AdLibs, enabling faster delivery cycles and a more reliable runtime experience for customers.

October 2024

4 Commits • 2 Features

Oct 1, 2024

Month: 2024-10 — This period delivered foundational UI improvements, correctness fixes, and release readiness for bbc/sofie-core. Key outcomes: improved rendering performance and integration via a memoized ThumbnailRenderer React component; correctness and stability gains from sorting rundowns in PlayoutModel generation with an accompanying regression test; and release readiness through an internal package version bump. Together these changes enhance user experience, reliability of playout sequencing, and deployment readiness for upcoming releases. Technologies demonstrated include React componentization and memoization, test-driven development, and release engineering.

Activity

Loading activity data...

Quality Metrics

Correctness91.8%
Maintainability91.6%
Architecture88.2%
Performance87.8%
AI Usage20.4%

Skills & Technologies

Programming Languages

CSSDockerfileHTMLJSONJSXJavaScriptMarkdownNodeSCSSShell

Technical Skills

API developmentAnimationAnimation LibrariesAsynchronous ProgrammingBackend DevelopmentCI/CDCSSChangelog ManagementCode DocumentationCode FormattingCode RefactoringComponent DevelopmentContribution GuidelinesCross-platform DevelopmentDatabase Management

Repositories Contributed To

2 repos

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

bbc/sofie-core

Oct 2024 Mar 2026
16 Months active

Languages Used

JSONJavaScriptTypeScripttsxCSSDockerfileHTMLJSX

Technical Skills

Backend DevelopmentCode DocumentationComponent DevelopmentFrontend DevelopmentPackage ManagementReact

microsoft/meteor

Jan 2025 Jan 2025
1 Month active

Languages Used

JavaScript

Technical Skills

Node.jsShell ScriptingWindows Development