July 2026: Focused on CI/CD reliability and tooling modernization for osrd. Key changes implemented across the OpenRailAssociation/osrd repo: 1) CI/CD Test Stabilization — disabled the frontend 'useSimulationResults' test to unblock CI while a permanent fix is developed. Changes confined to test files with the skip modifier. Commit: 33057bae534a6737f2f5fdc4591638461bd3d548. Related issue: https://github.com/OpenRailAssociation/osrd/issues/17671. 2) Gradle/Nix Tooling Upgrade for Core Module Compatibility — upgraded Nix flake dependencies and moved to Gradle 9 to meet the core module requirement (Gradle 9.2.x+). Commit: 957980e1381260a4be1587cd476beb976710b202. Business impact: Reduced CI pipeline downtime due to flaky tests, preserved release velocity, and ensured build stability across modules by aligning tooling with the core module requirements. Technologies/skills demonstrated: frontend test management and CI discipline, Nix flake tooling, Gradle 9.x upgrade, cross-repo collaboration, and release engineering.

June 2026 monthly summary for OpenRailAssociation/osrd: Focused on stabilizing frontend test reliability, improving debugging workflows, and preventing test flakiness that affected CI throughput. Delivered a new frontend test-debug script and resolved flaky tests in the useSimulationResults hook. Demonstrated strong frontend testing practices, including waitFor-based synchronization and robust test cleanup, contributing to a more reliable, faster feedback loop for feature work.

May 2026 performance summary for OpenRailAssociation/osrd: Delivered a focused set of user-facing feature enhancements and strengthened test coverage to reduce regression risk, while improving performance and localization. The month emphasized practical business value: smoother category selection, reliable keyboard interactions, flexible curve option controls in simulations, and scalable UI assets, all supported by comprehensive testing guidelines.

April 2026 monthly summary for OpenRailAssociation/osrd: Delivered a focused codebase cleanup by removing the StdcmUpgrade component, including the associated UI (StdcmUpgrade.tsx), styles, and translations. This reduces technical debt, shortens the onboarding curve for new contributors, and lowers the maintenance surface for the application. The change was implemented via a single commit that deletes the component, removes the upgrade class from _results.scss, and eliminates translations. No other features or major bugs were introduced this month; no major bug fixes were recorded. Demonstrated proficiency in frontend cleanup, TypeScript/React code Hygiene, SCSS/style management, and localization asset handling, with a clean commit sign-off.

March 2026 performance summary for OpenRailAssociation/osrd. Delivered a targeted refactor of debounce hooks, expanded test coverage for custom hooks, and removed an obsolete map feature to simplify maintenance. The work improved reliability of debounced UI behavior, boosted developer confidence, and reduced future maintenance risk, while maintaining a compact scope aligned with sprint goals.

February 2026 monthly summary for OpenRailAssociation/osrd: Focused on front-end UI enhancements for itinerary management, delivering cohesive improvements to user experience, localization readiness, and maintainability. The work delivered features such as a small-variant SegmentedControl for itinerary controls, a stop type toggle in path step items, localization updates, and an improved itinerary modal layout. No major bugs were reported in this scope; priority was on feature delivery and code quality.

September 2025 monthly summary for OpenRailAssociation/osrd: Implemented MacOS Build Compatibility Cleanup to remove legacy Apple SDK frameworks from flake.nix, addressing compatibility with darwin.apple_sdk_11_0 and aligning with updated Nixpkgs framework handling. This simplifies the macOS build environment, reduces build failures, and enhances developer onboarding and CI reliability.

July 2025 performance summary for OpenRailAssociation/osrd: Delivered a new Train Path Projection API enabling path analysis for paced trains across a defined set of operational points (with distances and point IDs). This included OpenAPI schema updates and full backend/frontend implementations, enabling operators to model and validate train paths more reliably. Fixed a critical deterministic initialization bug in editoast that previously could produce uninitialized or incorrect starting paths during projection or analysis, improving reliability and repeatability. These changes enhance operational planning accuracy, reduce risk in path projections, and lay groundwork for further analytics and optimization. Technologies demonstrated include API design with OpenAPI, end-to-end backend/frontend integration, and rigorous state initialization control.

June 2025 monthly summary for OpenRailAssociation/osrd focusing on feature delivery and system enhancements. Delivered a new projection capability that maps train schedules to a specified set of operational points, enabling distance-based visualization for planning and operations. The release also included API, OpenAPI, backend caching, and frontend typing work to support visualization and planning dashboards. No major bugs reported this month; the focus was on delivering a core planning feature and the supporting infrastructure.

May 2025 monthly summary for OpenRailAssociation/osrd. Delivered end-to-end occupancy blocks support across backend, API specs, and frontend to improve signaling accuracy and track-path calculations. Key backend API, spec, and frontend integration enable more reliable occupancy-aware scheduling and planning.

April 2025 monthly summary for OpenRailAssociation/osrd. Delivered the occupancy blocks backend pipeline to support planning and analysis workflows, including signal projection, caching, and new data schemas for processing and storage of train-occupancy data. Implemented a public REST API endpoint to retrieve occupancy blocks. Key internal work includes a new compute_occupancy_blocks function in a dedicated module and the occupancy_block endpoint exposure in paced_train, enabling smoother integration with existing APIs. This work enhances data availability, consistency, and performance for occupancy analytics, demonstrates solid backend computation, API design, and data modeling skills, and lays a scalable foundation for future analytics features.

March 2025 performance summary for OpenRailAssociation/osrd-ui: Delivered UI asset cleanup with the TrackOccupancyCanvas component, removing obsolete font imports and binary font assets in ui-charts; this reduces asset bloat, simplifies maintenance, and aligns with ongoing UI refactors. No major bugs fixed this month; focus on code quality and maintainability. Technologies demonstrated include React/TypeScript component cleanup, storybook asset management, and disciplined version-control practices, setting the stage for further UI refinements.

Month 2025-02: Focused stabilization of the Spacetime Chart in OpenRailAssociation/osrd-ui. Delivered a targeted frontend bug fix that ensures the spacetime chart's op graduation display updates correctly when certain operational points are hidden, and that any changes driven by machette settings trigger a redraw. This improves visual consistency and reliability of critical monitoring dashboards. Commit reference is traceable for this work. Impact: reduces visual drift, minimizes manual refresh needs, and enhances user trust in real-time visualization.

January 2025 performance highlights: Delivered UI icon standardization for the remove-via action in OpenRailAssociation/osrd, ensuring consistent icon usage and easier maintenance; Fixed CSV export correctness by switching to simulatedTrain.electrical_profiles for electrical profiles and updating overloadSteps; Expanded user-configs documentation in nixvim to include Yohh's nix-confix, improving configuration discoverability for users. These changes reduce maintenance friction, improve data integrity for exports, and accelerate onboarding.

December 2024 performance summary for OpenRailAssociation/osrd-ui. Delivered a major UI enhancement to the Track Occupancy Diagram, introducing through-train visualization and multi-train rendering, along with a selected-train highlight. Styling and maintainability improvements were completed in parallel (style.css, mockup color names) to support future iterations and Storybook/story assets. No major bugs fixed this month; primary focus was feature delivery, code quality, and establishing a solid foundation for extended data-driven visualization.

Month: 2024-11 | Repository: OpenRailAssociation/osrd-ui. Focused on delivering foundational Track Occupancy Diagram visuals and establishing a scalable, data-driven diagram architecture. Key features delivered include a baseline TrackOccupancyDiagram with core rendering and Storybook integration, a Time Captions Layer to display time-related information, and an Occupancy Zones Layer showing arrival/departure times, origin/destination, and train names. While no explicit bug fixes are listed in the provided data, initial rendering stability and data wiring were addressed to enable reliable visualization. This work improves stakeholder visibility into track occupancy and scheduling, enabling faster validation and iteration. Note: No major bugs fixed were recorded in the supplied data; the emphasis was on feature delivery and scaffolding that reduces future rework.