mbta/dotcom
Nov 2024 – Nov 2025
13 Months active
Languages Used
ElixirHTMLEExJavaScriptSCSSSVGTypeScriptCSS
Technical Skills
Backend DevelopmentCSSElixirFull Stack DevelopmentHTMLLive Components
Josh Larson
PROFILE
Josh Larson
Over thirteen months, John Larson delivered robust user-facing features and reliability improvements for the mbta/dotcom repository, focusing on real-time system status, trip planning, and schedule discovery. He engineered LiveView-based status and alerts interfaces, consolidated and refactored UI components for maintainability, and enhanced accessibility and localization. Leveraging Elixir, TypeScript, and CSS, John modernized admin tooling, stabilized test infrastructure, and improved data accuracy through backend and frontend integration. His work addressed complex routing, caching, and real-time updates, resulting in clearer information for users and streamlined developer workflows. The depth of his contributions reflects strong full-stack engineering and sustainable code practices.
Overall Statistics
Feature vs Bugs
54%Features
Repository Contributions
186Total
Bugs
57
Commits
186
Features
66
Lines of code
24,292
Activity Months13
Your Network
27 people
Work History
November 2025
1 Commits • 1 Features
Nov 1, 2025November 2025 (mbta/dotcom): Delivered Real-Time Commuter Rail status updates on the CR alerts page by introducing a new CR status cache and integrating it with the existing system status and alerts UI. This results in up-to-date information for users, reduced backend load, and improved reliability during service incidents. Major bugs fixed: none reported this month for this feature.
1 Commits • 1 Features
Nov 1, 2025November 2025 (mbta/dotcom): Delivered Real-Time Commuter Rail status updates on the CR alerts page by introducing a new CR status cache and integrating it with the existing system status and alerts UI. This results in up-to-date information for users, reduced backend load, and improved reliability during service incidents. Major bugs fixed: none reported this month for this feature.
November 2025
October 2025
10 Commits • 2 Features
Oct 1, 2025October 2025: Real-time status improvements and reliability enhancements across commuter rail and subway alerts. Delivered aggregated multi-trip status and improved delay/cancellation accuracy, enabled live subway status updates, and removed non-functional routes to reduce risk. Fixed key edge cases (planned disruptions recurrence, FallWeekday schedule loading) and strengthened test reliability and maintainability. Business value includes more accurate status information, faster updates, reduced user friction, and lower deployment risk.
October 2025
10 Commits • 2 Features
Oct 1, 2025October 2025: Real-time status improvements and reliability enhancements across commuter rail and subway alerts. Delivered aggregated multi-trip status and improved delay/cancellation accuracy, enabled live subway status updates, and removed non-functional routes to reduce risk. Fixed key edge cases (planned disruptions recurrence, FallWeekday schedule loading) and strengthened test reliability and maintainability. Business value includes more accurate status information, faster updates, reduced user friction, and lower deployment risk.
September 2025
12 Commits • 6 Features
Sep 1, 2025September 2025 highlights for mbta/dotcom: Completed major UI and reliability improvements across alerts, LiveView alerts, and schedule displays, enhanced system status messaging, and improved discoverability. Replaced static commuter rail alerts with a LiveView, stabilized caching for bus stop change events, cleaned up tests, and removed obsolete components to streamline the codebase. These efforts delivered tangible business value: faster alert rendering, clearer delays information, easier maintenance, and better SEO discoverability.
12 Commits • 6 Features
Sep 1, 2025September 2025 highlights for mbta/dotcom: Completed major UI and reliability improvements across alerts, LiveView alerts, and schedule displays, enhanced system status messaging, and improved discoverability. Replaced static commuter rail alerts with a LiveView, stabilized caching for bus stop change events, cleaned up tests, and removed obsolete components to streamline the codebase. These efforts delivered tangible business value: faster alert rendering, clearer delays information, easier maintenance, and better SEO discoverability.
September 2025
August 2025
9 Commits • 4 Features
Aug 1, 2025August 2025 — mbta/dotcom monthly delivery recap focused on delivering user-facing capabilities, improving reliability, and expanding localization and payment options. Key features delivered: - Date/Time handling refactor and testability improvements: Replaced mocks with actual implementations for DateTime functions to improve testability and reduce brittle test setups. - Subway real-time alerts UI: Replaced the static alerts page with a LiveView that shows real-time service alerts, planned disruptions, and system status; main view now highlights only non-service-impacting alerts for clarity. - Internationalization improvements: Added Gettext localization for fare formatting and implemented And/Or conjunctions across the UI to support multilingual users. - Contactless payment for ferry rides: Enabled and UI-updated ferry fare flow to include contactless payments as a valid option. Major bugs fixed: - Static analysis / Dialyzer fixes: Moved aliases into controllers and cleaned up dialyzer_ignore entries to prevent false positives (FareController alias and SearchController typespec issues). - Test reliability improvement: Ensured generated values are distinct with a single Faker.Util.sample_uniq call to reduce flaky tests. - Schedule finder weekday logic fix: Excluded Fridays, Saturdays, and Sundays to accurately reflect true weekday schedules. Overall impact and accomplishments: - Improved code quality, test reliability, and maintainability; delivered a richer, real-time UX for alerts; broadened accessibility and usability with localization; and added a convenient payment option for ferry riders, contributing to higher user satisfaction and smoother release cycles. Technologies/skills demonstrated: - Elixir/Phoenix with LiveView, Gettext for i18n, Dialyzer/type-check hygiene, robust test data strategies (Faker), and UI/UX improvements focused on accessibility and performance.
August 2025
9 Commits • 4 Features
Aug 1, 2025August 2025 — mbta/dotcom monthly delivery recap focused on delivering user-facing capabilities, improving reliability, and expanding localization and payment options. Key features delivered: - Date/Time handling refactor and testability improvements: Replaced mocks with actual implementations for DateTime functions to improve testability and reduce brittle test setups. - Subway real-time alerts UI: Replaced the static alerts page with a LiveView that shows real-time service alerts, planned disruptions, and system status; main view now highlights only non-service-impacting alerts for clarity. - Internationalization improvements: Added Gettext localization for fare formatting and implemented And/Or conjunctions across the UI to support multilingual users. - Contactless payment for ferry rides: Enabled and UI-updated ferry fare flow to include contactless payments as a valid option. Major bugs fixed: - Static analysis / Dialyzer fixes: Moved aliases into controllers and cleaned up dialyzer_ignore entries to prevent false positives (FareController alias and SearchController typespec issues). - Test reliability improvement: Ensured generated values are distinct with a single Faker.Util.sample_uniq call to reduce flaky tests. - Schedule finder weekday logic fix: Excluded Fridays, Saturdays, and Sundays to accurately reflect true weekday schedules. Overall impact and accomplishments: - Improved code quality, test reliability, and maintainability; delivered a richer, real-time UX for alerts; broadened accessibility and usability with localization; and added a convenient payment option for ferry riders, contributing to higher user satisfaction and smoother release cycles. Technologies/skills demonstrated: - Elixir/Phoenix with LiveView, Gettext for i18n, Dialyzer/type-check hygiene, robust test data strategies (Faker), and UI/UX improvements focused on accessibility and performance.
July 2025
9 Commits • 3 Features
Jul 1, 2025July 2025 mbta/dotcom monthly summary focusing on delivering robust alerts and improved UI/UX to boost reliability and user efficiency. Key work included enhancements to alerts and disruptions, stabilization of timetable navigation, and targeted itinerary and ferry schedule UI improvements. These changes improve operational visibility, trip-planning clarity, and overall user confidence, while demonstrating end-to-end feature delivery from backend signaling to frontend UX.
9 Commits • 3 Features
Jul 1, 2025July 2025 mbta/dotcom monthly summary focusing on delivering robust alerts and improved UI/UX to boost reliability and user efficiency. Key work included enhancements to alerts and disruptions, stabilization of timetable navigation, and targeted itinerary and ferry schedule UI improvements. These changes improve operational visibility, trip-planning clarity, and overall user confidence, while demonstrating end-to-end feature delivery from backend signaling to frontend UX.
July 2025
June 2025
12 Commits • 3 Features
Jun 1, 2025June 2025 performance summary for mbta/dotcom: Delivered customer-facing status enhancements, strengthened reliability of core utilities, and advanced accessibility and data hygiene. Key outcomes include clearer Commuter Rail status in timetable views, improved subway delay readability on small screens, stabilized time utilities to reduce flaky tests, and accessibility refinements in the trip planner, alongside policy-aligned delay filtering to reduce noise.
June 2025
12 Commits • 3 Features
Jun 1, 2025June 2025 performance summary for mbta/dotcom: Delivered customer-facing status enhancements, strengthened reliability of core utilities, and advanced accessibility and data hygiene. Key outcomes include clearer Commuter Rail status in timetable views, improved subway delay readability on small screens, stabilized time utilities to reduce flaky tests, and accessibility refinements in the trip planner, alongside policy-aligned delay filtering to reduce noise.
May 2025
24 Commits • 8 Features
May 1, 2025May 2025 monthly summary for mbta/dotcom: Delivered key UI improvements, system-status enhancements, and data accuracy enhancements, while improving accessibility, test stability, and code health. Focused on consolidating subway status headers and upgrading header layout, expanding visibility of status data (affected and endpoint stops), and surfacing Worcester shuttle stops in TimetableController. Also completed CR status component refactor to reduce duplication and removed outdated UI component to reduce debt. Upgraded test data tooling to keep fixtures aligned with Elixir ecosystem. These changes improved UI consistency, data reliability, and developer velocity.
24 Commits • 8 Features
May 1, 2025May 2025 monthly summary for mbta/dotcom: Delivered key UI improvements, system-status enhancements, and data accuracy enhancements, while improving accessibility, test stability, and code health. Focused on consolidating subway status headers and upgrading header layout, expanding visibility of status data (affected and endpoint stops), and surfacing Worcester shuttle stops in TimetableController. Also completed CR status component refactor to reduce duplication and removed outdated UI component to reduce debt. Upgraded test data tooling to keep fixtures aligned with Elixir ecosystem. These changes improved UI consistency, data reliability, and developer velocity.
May 2025
April 2025
26 Commits • 11 Features
Apr 1, 2025April 2025 monthly summary for mbta/dotcom: Delivered meaningful features for schedule discovery and terminal loading, improved route visibility, and reduced maintenance burden through code cleanup, while addressing reliability and UI consistency to drive business value.
April 2025
26 Commits • 11 Features
Apr 1, 2025April 2025 monthly summary for mbta/dotcom: Delivered meaningful features for schedule discovery and terminal loading, improved route visibility, and reduced maintenance burden through code cleanup, while addressing reliability and UI consistency to drive business value.
March 2025
18 Commits • 5 Features
Mar 1, 2025March 2025 performance summary for mbta/dotcom. Delivered UI improvements, routing infrastructure, and accessibility enhancements that improve user experience, navigation reliability, and accessibility compliance. Major feature work included Subway Status UI improvements with clearer single-day disruption formatting, enhanced collapse logic, accessibility and navigation improvements, and expanded testing coverage for collapse behavior; robust routing redirects with a PathParamsRedirector to preserve path params and support route renames; trip-planning routing and accessibility improvements including OSM reconciliation, datepicker mount fixes, and robust focus handling; alerts page UI/infrastructure tweaks such as mobile footer fixes, planned-work anchor, and standardized map tile URLs. Additionally, a targeted code cleanup and internal refactor (prop-order standardization) improved maintainability. Major bugs fixed include CI reliability improvements by marking flaky tests and fixes around trip-planner datepicker mount and dropdown focus behavior. Business impact includes clearer status visibility for subway disruptions, more reliable navigation after route renames, improved accessibility, and faster, more stable release cycles.
18 Commits • 5 Features
Mar 1, 2025March 2025 performance summary for mbta/dotcom. Delivered UI improvements, routing infrastructure, and accessibility enhancements that improve user experience, navigation reliability, and accessibility compliance. Major feature work included Subway Status UI improvements with clearer single-day disruption formatting, enhanced collapse logic, accessibility and navigation improvements, and expanded testing coverage for collapse behavior; robust routing redirects with a PathParamsRedirector to preserve path params and support route renames; trip-planning routing and accessibility improvements including OSM reconciliation, datepicker mount fixes, and robust focus handling; alerts page UI/infrastructure tweaks such as mobile footer fixes, planned-work anchor, and standardized map tile URLs. Additionally, a targeted code cleanup and internal refactor (prop-order standardization) improved maintainability. Major bugs fixed include CI reliability improvements by marking flaky tests and fixes around trip-planner datepicker mount and dropdown focus behavior. Business impact includes clearer status visibility for subway disruptions, more reliable navigation after route renames, improved accessibility, and faster, more stable release cycles.
March 2025
February 2025
12 Commits • 3 Features
Feb 1, 2025February 2025 highlights for mbta/dotcom focused on delivering a real-time system status experience, strengthening security, improving code quality, and resolving critical UI/correctness gaps. The team shipped a real-time per-line subway status view with a Hi-Fidelity widget and a UI that gracefully collapses when the status list becomes long, underpinned by a robust backend data structure. We also hardened access controls for previewing system status and advanced, maintainable testing and CI practices to reduce risk and speed future delivery. Key fixes addressed UX and data correctness, laying a solid foundation for future observability features.
February 2025
12 Commits • 3 Features
Feb 1, 2025February 2025 highlights for mbta/dotcom focused on delivering a real-time system status experience, strengthening security, improving code quality, and resolving critical UI/correctness gaps. The team shipped a real-time per-line subway status view with a Hi-Fidelity widget and a UI that gracefully collapses when the status list becomes long, underpinned by a robust backend data structure. We also hardened access controls for previewing system status and advanced, maintainable testing and CI practices to reduce risk and speed future delivery. Key fixes addressed UX and data correctness, laying a solid foundation for future observability features.
January 2025
15 Commits • 3 Features
Jan 1, 2025January 2025 focused on delivering high-impact user-facing features, modernizing admin tooling, and strengthening stability and maintainability across mbta/dotcom. Key outcomes include a revamped Trip Planner UX with auto-submit and accurate itinerary display, real-time system status visibility, and a streamlined admin UI, plus non-user-facing cleanup to reduce risk and improve developer experience.
15 Commits • 3 Features
Jan 1, 2025January 2025 focused on delivering high-impact user-facing features, modernizing admin tooling, and strengthening stability and maintainability across mbta/dotcom. Key outcomes include a revamped Trip Planner UX with auto-submit and accurate itinerary display, real-time system status visibility, and a streamlined admin UI, plus non-user-facing cleanup to reduce risk and improve developer experience.
January 2025
December 2024
35 Commits • 16 Features
Dec 1, 2024December 2024: Delivered architecture refinements, UI/UX improvements, and reliability hardening for the Trip Planner and map results in mbta/dotcom. Focus areas included component refactors, data-model simplifications for itinerary rendering, Depart At flow enhancements, and navigation improvements with a sticky map. Result: clearer user journeys, easier maintenance, and more stable test runs.
December 2024
35 Commits • 16 Features
Dec 1, 2024December 2024: Delivered architecture refinements, UI/UX improvements, and reliability hardening for the Trip Planner and map results in mbta/dotcom. Focus areas included component refactors, data-model simplifications for itinerary rendering, Depart At flow enhancements, and navigation improvements with a sticky map. Result: clearer user journeys, easier maintenance, and more stable test runs.
November 2024
3 Commits • 1 Features
Nov 1, 2024In November 2024, delivered a focused set of improvements for mbta/dotcom, emphasizing business value, stability, and user-facing enhancements. Key outcomes include a new itinerary_summary component integrated into the Trip Planner UI, a reliability improvement in the route symbols test, and a template-system stabilization pass that reverts the root template back to .heex with cleanup. These changes improve user experience, reduce flaky tests, and ensure maintainable templating and rendering across the application.
3 Commits • 1 Features
Nov 1, 2024In November 2024, delivered a focused set of improvements for mbta/dotcom, emphasizing business value, stability, and user-facing enhancements. Key outcomes include a new itinerary_summary component integrated into the Trip Planner UI, a reliability improvement in the route symbols test, and a template-system stabilization pass that reverts the root template back to .heex with cleanup. These changes improve user experience, reduce flaky tests, and ensure maintainable templating and rendering across the application.
November 2024
Activity
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Quality Metrics
Correctness92.6%
Maintainability92.4%
Architecture88.2%
Performance89.6%
AI Usage20.2%
Skills & Technologies
Programming Languages
CSSEExElixirExUnitGettextHTMLJSXJavaScriptMarkdownSCSS
Technical Skills
API DesignAPI DevelopmentAPI IntegrationAccessibilityBackend DevelopmentBug FixingCI/CDCSSCSS GridCachingCode CleanupCode FormattingCode MaintenanceCode OrganizationCode Quality
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline