opentripplanner/OpenTripPlanner
Feb 2025 – Oct 2025
4 Months active
Languages Used
Java
Technical Skills
Backend DevelopmentCode OptimizationFare CalculationJavaJava DevelopmentRefactoring
danielhep
PROFILE
Danielhep
Daniel Heppner enhanced the OpenTripPlanner repository by building and refining complex fare calculation systems for multi-agency transit environments. Over four months, he implemented new fare structures for CT Flex, Water Taxi, and Monorail, introducing agency-specific logic and UUID-based fare products to support evolving policy requirements. His technical approach emphasized maintainability through code refactoring, centralized logic, and robust unit testing, using Java and backend development best practices. By stabilizing test suites, removing dead code, and aligning fare logic with effective dates, Daniel improved pricing accuracy and system reliability, enabling smoother policy rollouts and reducing maintenance risk for future fare changes.
Overall Statistics
Feature vs Bugs
75%Features
Repository Contributions
18Total
Bugs
2
Commits
18
Features
6
Lines of code
824
Activity Months4
Your Network
38 people
Work History
October 2025
3 Commits • 1 Features
Oct 1, 2025Monthly summary for 2025-10 focusing on delivering Monorail fare pricing enhancements and improving test coverage for Monorail fare calculations. Key outcomes include accurate pricing logic, UUID-based fare products, improved transfer/youth fare handling for Monorail, and robust test coverage to prevent regressions. The work enhances multi-agency pricing readiness and end-user pricing reliability, with measurable business value and maintainability gains.
3 Commits • 1 Features
Oct 1, 2025Monthly summary for 2025-10 focusing on delivering Monorail fare pricing enhancements and improving test coverage for Monorail fare calculations. Key outcomes include accurate pricing logic, UUID-based fare products, improved transfer/youth fare handling for Monorail, and robust test coverage to prevent regressions. The work enhances multi-agency pricing readiness and end-user pricing reliability, with measurable business value and maintainability gains.
October 2025
September 2025
6 Commits • 2 Features
Sep 1, 20252025-09 Monthly summary for OpenTripPlanner (opentripplanner/OpenTripPlanner). Focused on delivering durable fare infrastructure, stabilizing the fare model, and strengthening maintainability to support policy changes and cross-agency pricing. Key features delivered: - Water Taxi Fare: Permanent Fare Structure implemented; removed Sept 1 conditional to ensure correct and consistent fares for Vashon and West Seattle. Commit: 3a94be0dd8a10725aecf16b80f9424fccc70fe57. - OrcaFareService Overhaul: Leg-Specific Fares and Transfer Logic. Refactored to generate leg-specific fare offers, improved inter-agency and same-agency transfer handling, removed dead code, streamlined filtering of valid fare products and transfer calculations; updated tests accordingly. Commits include: rewrite Orca fare model to generate fare products; format code; clean up some logic; remove unused function; fix test error. Major bugs fixed: - Stabilized fare-related test failures after OrcaFareService refactor; removed dead code paths that caused flaky behavior; ensured transfer logic aligns with updated fare products across agencies. Overall impact and accomplishments: - Improved pricing accuracy and consistency across agencies, reducing revenue leakage and enhancing user trust. - Enhanced maintainability and test coverage, enabling faster iterations on fare policies. - Clear separation of concerns between fare generation, transfer handling, and validation logic, setting a solid baseline for future policy changes. Technologies/skills demonstrated: - Large-scale refactoring and domain modeling (leg-specific fares, transfer logic). - Test-driven development and test suite stabilization (test updates and error fixes). - Code quality improvements: formatting, dead code removal, and function cleanup. - Cross-service collaboration readiness across multi-agency fare systems.
September 2025
6 Commits • 2 Features
Sep 1, 20252025-09 Monthly summary for OpenTripPlanner (opentripplanner/OpenTripPlanner). Focused on delivering durable fare infrastructure, stabilizing the fare model, and strengthening maintainability to support policy changes and cross-agency pricing. Key features delivered: - Water Taxi Fare: Permanent Fare Structure implemented; removed Sept 1 conditional to ensure correct and consistent fares for Vashon and West Seattle. Commit: 3a94be0dd8a10725aecf16b80f9424fccc70fe57. - OrcaFareService Overhaul: Leg-Specific Fares and Transfer Logic. Refactored to generate leg-specific fare offers, improved inter-agency and same-agency transfer handling, removed dead code, streamlined filtering of valid fare products and transfer calculations; updated tests accordingly. Commits include: rewrite Orca fare model to generate fare products; format code; clean up some logic; remove unused function; fix test error. Major bugs fixed: - Stabilized fare-related test failures after OrcaFareService refactor; removed dead code paths that caused flaky behavior; ensured transfer logic aligns with updated fare products across agencies. Overall impact and accomplishments: - Improved pricing accuracy and consistency across agencies, reducing revenue leakage and enhancing user trust. - Enhanced maintainability and test coverage, enabling faster iterations on fare policies. - Clear separation of concerns between fare generation, transfer handling, and validation logic, setting a solid baseline for future policy changes. Technologies/skills demonstrated: - Large-scale refactoring and domain modeling (leg-specific fares, transfer logic). - Test-driven development and test suite stabilization (test updates and error fixes). - Code quality improvements: formatting, dead code removal, and function cleanup. - Cross-service collaboration readiness across multi-agency fare systems.
August 2025
5 Commits • 1 Features
Aug 1, 2025In August 2025, delivered key enhancements and fixes for OpenTripPlanner. Implemented Fare Calculation Updates for Sep-Oct 2025 across Kitsap Fast Ferry and Water Taxi, removing outdated date logic and aligning tests with intended scenarios. Performed Code Formatting Cleanup for OrcaFareService to improve readability with no functional changes. Fixed test issues and stabilized the fare calculation workflow, reducing risk of regressions in the upcoming period. These efforts improved fare accuracy, test reliability, and code maintainability, enabling smoother rollout of fare changes and faster onboarding for future changes.
5 Commits • 1 Features
Aug 1, 2025In August 2025, delivered key enhancements and fixes for OpenTripPlanner. Implemented Fare Calculation Updates for Sep-Oct 2025 across Kitsap Fast Ferry and Water Taxi, removing outdated date logic and aligning tests with intended scenarios. Performed Code Formatting Cleanup for OrcaFareService to improve readability with no functional changes. Fixed test issues and stabilized the fare calculation workflow, reducing risk of regressions in the upcoming period. These efforts improved fare accuracy, test reliability, and code maintainability, enabling smoother rollout of fare changes and faster onboarding for future changes.
August 2025
February 2025
4 Commits • 2 Features
Feb 1, 2025February 2025 monthly summary for opentripplanner/OpenTripPlanner: Implemented CT Flex Fare Expansion and CT Fare Logic Refactor with date handling enhancements. These changes deliver business value by enabling accurate CT Flex fare application across routes, agencies, and effective dates, and by aligning fare checks with the March 1, 2025 boundary. Centralized CT local reduced fare logic into reusable methods and standardized date handling with LocalDate, reducing maintenance risk and future-proofing the codebase for upcoming fare changes.
February 2025
4 Commits • 2 Features
Feb 1, 2025February 2025 monthly summary for opentripplanner/OpenTripPlanner: Implemented CT Flex Fare Expansion and CT Fare Logic Refactor with date handling enhancements. These changes deliver business value by enabling accurate CT Flex fare application across routes, agencies, and effective dates, and by aligning fare checks with the March 1, 2025 boundary. Centralized CT local reduced fare logic into reusable methods and standardized date handling with LocalDate, reducing maintenance risk and future-proofing the codebase for upcoming fare changes.
Activity
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Quality Metrics
Correctness88.8%
Maintainability88.8%
Architecture83.8%
Performance81.2%
AI Usage21.2%
Skills & Technologies
Programming Languages
Java
Technical Skills
API IntegrationBackend DevelopmentCode FormattingCode OptimizationCode RefactoringFare CalculationFare Calculation LogicFare System ImplementationJavaJava DevelopmentRefactoringTestingTransit SystemsUnit Testing
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