October 2025 monthly summary for OpenRailAssociation/osrd focused on delivering core frontend/backend stabilization, API organization, and code quality improvements. Highlighted the shift to a modern dev stack, improved data correctness, and more reliable user experiences.

Month: 2025-09 — OpenRailAssociation/osrd. Delivered focused front-end improvements to time handling, date management, and code quality, with reinforced data integrity and reliability across the UI. This period emphasized delivering business value through correct timetable calculations, stable rendering, and a leaner frontend toolchain.

August 2025 monthly highlights: Delivered user-facing features for zero-train counts with i18n, standardized locale-aware time formatting across UI and exports, and completed internal stability improvements. Added OpenAPI codegen option useUnknown with dependency updates. These changes improve translation resilience, consistent scheduling displays, and long-term maintainability, while strengthening CI/docs workflows.

Summary for 2025-07 for OpenRailAssociation/osrd: key features delivered, bugs fixed, and business impact across the OSRD project. The month focused on end-to-end round-trip support, data integration, frontend localization, and release/infra improvements, delivering measurable improvements in data fidelity, UI correctness, and deployment speed.

June 2025 performance highlights focused on CI/CD efficiency, reliability, and frontend stability across two repos (numerique-gouv/impress and OpenRailAssociation/osrd). Key outcomes include faster Docker builds and smaller images, a reliable development environment for YdocConverter, stabilized automated OSRD-UI releases, and significant i18n and UI polish work—delivered through targeted refactors and maintenance to reduce technical debt and improve long-term maintainability.

May 2025: Delivered notable frontend improvements for OpenRailAssociation/osrd with a focus on reducing debt, boosting reliability, and improving operator UX during long-running simulations. Key work spanned date/time handling with Duration support, UI/formatting cleanups, and build/import reliability, complemented by targeted bug fixes and documentation updates. The result is faster compilation, clearer operator feedback during tasks, and a more maintainable codebase with centralized API types and improved i18n.

2025-04 Monthly Summary: Focused on delivering business value through performance improvements, UX stability, and stronger developer experience across OpenRailAssociation OSRD and OSRD-UI. The month included notable features, bug fixes, and tooling enhancements that improve load performance, translation hygiene, and maintainability. Key features delivered: - Train Simulation Lazy Loading: introduced TrainSimulationLazyLoader and useLazySimulateTrains across scenario data and train projections to enable on-demand loading and faster initial render times. - Occurrence ID mapping: adopted formatPacedTrainIdToOccurrenceId() in useOccurrences for safer, more consistent ID handling. - STDCM UX improvements: customize name in the Help us message and convert the STDCM feedback button into a hyperlink for better accessibility. - StdcmPathStep.stopFor: used Duration for timing to improve time handling; duration typing added for StdcmResultsOperationalPoint. - UI/CSS refactor: prefix outer CSS classes with ui- and remove the global font-size rule to improve consistency and maintainability. - Internationalization modernization: adopt TFunction/react-i18next with explicit namespaces and typed translation keys; i18n-checker improvements for translation hygiene. Major bugs fixed: - Scenario page cross-window synchronization: ensured consistent views across multiple windows. - Front-end blinking fix when launching NGE: eliminated a visual flicker during startup. - UI Manchette/Chart stability: fixed minimum height in linear mode and resolved issues with zero waypoints in useManchetteWithSpaceTimeChart. Overall impact and accomplishments: - Business value: faster, more predictable simulations; more reliable multi-window collaboration; improved chart visuals and user experience. - Technical achievements: stronger type-safety, modern i18n stack, and higher CI/build quality through ESLint enforcement and tooling cleanup. Technologies/skills demonstrated: - React and TypeScript - React-i18next and i18n tooling (TFunction, namespaces) - Duration types and type-safe time handling - ESLint/Rollup CI integration and Storybook maintenance - i18n-checker improvements and documentation focus

March 2025 monthly summary for OpenRailAssociation development: - Delivered stability fixes and key UI/UX improvements across three repos (osrd, osrd-ui, osrd-website) with a strong focus on business value, reliability, and developer experience. - Key features and improvements span frontend bug fixes, UI refactors, UI tooling, and website upgrades, enabling faster iteration and more robust product surfaces. - CI/CD, build tooling, and packaging enhancements improved developer velocity and deployment reliability. Highlights by area: - Frontend (osrd): Fixed MacroEditorState path keys handling when secondary code is missing; rethrow fatal errors in E2E tests; fix language list rendering/selection; cleaned up API surface (drop deprecated props and wrapper callbacks); improved performance and point calculations; added loader for macro editor; consolidated formatting helpers; extracted computeOccurrenceName. - UI (osrd-ui): Core UI charts refactor (isolated types/helpers for Point/Segment/Conflict), Storybook reorganization, and icon/story packaging refactors to central ui-icons; import/osrd-ui wiring into front build; various build and linting improvements. - Website and docs (osrd-website): Upgraded to Docsy upstream theme with Hugo updates for stability; fixed navigation/index link issues and Swagger UI REST API docs; CI/CD workflow improvements, Node.js v22 LTS, ubuntu-latest, and REUSE checks; Docker/Hugo image adjustments for dev environments. Overall impact: increased stability, improved end-user experience, faster release cycles, and stronger alignment between front-end, docs, and deployment pipelines.

February 2025 delivered a structured modernization and reliability push across the OpenRailAssociation stack (OSRD, OSRD-UI) with tangible business value in reliability, performance, and maintainability. Key outcomes include migrating the frontend to ES modules and removing CommonJS, upgrading OpenAPI/RTK codegen to upstream oazapfts and RTK Codegen v2.0.0, and simplifying gateway API contracts to reduce runtime ambiguity. The team introduced a unified Duration abstraction across core scheduling logic (TrainScheduleWithDetails, keepTrainsRunningDuringStdcm, computeOpSchedules) and migrated train data structures from Record to Map, improving correctness and mutability semantics. End-to-end tests were modernized (readJsonFile, ES module–compatible dayjs, PDF handling replacement) and test naming standardized to .spec.ts, boosting test reliability and maintainability. In addition, linting/tooling cleanup, Docker build optimization, and Storybook/ui-exports groundwork were completed to accelerate future feature delivery and reduce build friction.

January 2025 — Performance-focused delivery across osrd and osrd-ui, delivering core front-end enhancements, stability fixes, and build-system improvements that enhance data integrity, user experience, and developer productivity.

December 2024 highlights across OpenRailAssociation/osrd, OpenRailAssociation/osrd-ui, and itchyny/go. Delivered core frontend features and stability improvements that support scheduling accuracy, map/UI resilience, and long-term maintainability. Business value came from stronger data integrity in time handling, reduced UI edge cases when external map data is unavailable, and a leaner, more robust codebase with modernized data models and tooling.

November 2024: Performance-focused updates across OpenRailAssociation/osrd and osrd-ui, balancing feature delivery with reliability improvements. Key backend change: timezone-aware DateTime usage in the EdItoast work schedule API, enabling correct cross-time-zone scheduling and more trustworthy analytics. Frontend enhancements target code health and correctness, including removal of obsolete constructs and targeted matching improvements. Specifically, the frontend removed PathStep.ch, dropped the parseDateTime utility, and introduced robust path-step handling with matchPathStepAndOp() in TimesStopsInput.clearPathStep(). A bug fix ensured the ch code remains null when unspecified during XML import, preventing inconsistent data states. These changes were complemented by targeted dependency updates and small UX/stability improvements to support faster, safer deployments and clearer developer documentation.

October 2024: Delivered core UI stability and frontend modernization across OpenRailAssociation/osrd-ui and osrd. Key results include consistent panning in Manchette Chart, date-driven TrainSchedule UI with Date objects, and a full TypeScript migration. These changes improve reliability, data correctness, maintainability, and developer onboarding, delivering tangible business value in user experience and faster feature delivery.