opentripplanner/OpenTripPlanner
Jan 2026 – Jan 2026
1 Month active
Languages Used
Java
Technical Skills
Javabackend developmentrouting algorithmstest-driven developmentunit testing
Håkon Bliksås Carlsen
PROFILE
Håkon Bliksås Carlsen
Worked on the opentripplanner/OpenTripPlanner repository to enhance carpool routing accuracy and improve test reliability. Developed a feature that refactored multi-stop carpool trip duration calculations to use the actual origin-to-destination duration, resulting in more precise routing and a better user experience. Addressed a key bug by refactoring InsertionEvaluatorTest to use deterministic routing functions, ensuring consistent outputs for identical inputs and increasing test stability. Utilized Java for backend development, focusing on routing algorithms, unit testing, and test-driven development. These contributions strengthened continuous integration reliability, reduced flaky tests, and enabled safer, faster deployments for the project’s carpool routing functionality.
Overall Statistics
Feature vs Bugs
50%Features
Repository Contributions
2Total
Bugs
1
Commits
2
Features
1
Lines of code
259
Activity Months1
Your Network
60 peopleSame Organization
@entur.org8
Shared Repositories
52
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Work History
January 2026
2 Commits • 1 Features
Jan 1, 2026January 2026 focused on enhancing carpool routing accuracy and reinforcing test reliability for the opentripplanner/OpenTripPlanner project. Key deliverable: Carpool Routing Duration Enhancement, which refactors duration calculation for multi-stop carpools to use the origin-to-destination duration instead of the baseline, improving routing precision and user experience (commit 33001d88b68276d699df7ba156f89077eb0607e9). Major bug fix: InsertionEvaluatorTest was refactored to use deterministic routing functions, ensuring identical outputs for identical inputs and boosting test reliability (commit ad6174dfa8d84c4ad5842a1cdc297458ae4287c5). Overall impact: higher quality carpool routing and more stable CI, enabling faster iteration and safer deployments. Technologies/skills demonstrated: Java, routing algorithm refinement, unit/integration testing, test determinism, and commit traceability.
2 Commits • 1 Features
Jan 1, 2026January 2026 focused on enhancing carpool routing accuracy and reinforcing test reliability for the opentripplanner/OpenTripPlanner project. Key deliverable: Carpool Routing Duration Enhancement, which refactors duration calculation for multi-stop carpools to use the origin-to-destination duration instead of the baseline, improving routing precision and user experience (commit 33001d88b68276d699df7ba156f89077eb0607e9). Major bug fix: InsertionEvaluatorTest was refactored to use deterministic routing functions, ensuring identical outputs for identical inputs and boosting test reliability (commit ad6174dfa8d84c4ad5842a1cdc297458ae4287c5). Overall impact: higher quality carpool routing and more stable CI, enabling faster iteration and safer deployments. Technologies/skills demonstrated: Java, routing algorithm refinement, unit/integration testing, test determinism, and commit traceability.
January 2026
Activity
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Quality Metrics
Correctness100.0%
Maintainability80.0%
Architecture80.0%
Performance80.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
Java
Technical Skills
Javabackend developmentrouting algorithmstest-driven developmentunit testing
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