matsim-org/matsim-libs
Jul 2025 – Apr 2026
2 Months active
Languages Used
Java
Technical Skills
Integration TestingMATSimRail SimulationJavaalgorithm designintegration testing
Merlin Unterfinger
PROFILE
Merlin Unterfinger
Worked on the matsim-org/matsim-libs repository to enhance rail simulation reliability and validation. Developed integration tests in Java to stress-test complex 3-way junctions, focusing on bidirectional traffic, conflict resolution, and resource locking under dense schedules. Introduced train reversal logic improvements, including assertions for train length validation at departure and arrival, and refined turn restriction handling to reduce simulation deadlocks. Expanded test coverage with micro reversal and rerouting scenarios, while optimizing IO performance through GZIP compression of time-distance outputs. Contributed documentation updates and TODOs to clarify reversing logic, demonstrating a methodical approach to integration testing, algorithm design, and unit testing.
Overall Statistics
Feature vs Bugs
100%Features
Repository Contributions
2Total
Bugs
0
Commits
2
Features
2
Lines of code
2,209
Activity Months2
Your Network
66 peopleSame Organization
@sbb.ch35
Shared Repositories
31
aleksMember
anaueMember
Ricardo EwertMember
Friedrich VölkersMember
Gerry CaseyMember
paulhMember
u234825Member
Jakob RehmannMember
janekderersteMember
Work History
April 2026
1 Commits • 1 Features
Apr 1, 2026April 2026 (2026-04) – Matsim-libs railsim refinements and reliability enhancements focused on train reversal, validation, and routing logic. Key deliverables include addition of train length validation assertions, improved handling of turn restrictions and deadlock avoidance, and IO/performance optimization via time-distance output compression. Expanded test coverage with micro reversal tests and an integration test for turn restrictions with rerouting, alongside documentation clarifications and TODOs for reversing logic.
1 Commits • 1 Features
Apr 1, 2026April 2026 (2026-04) – Matsim-libs railsim refinements and reliability enhancements focused on train reversal, validation, and routing logic. Key deliverables include addition of train length validation assertions, improved handling of turn restrictions and deadlock avoidance, and IO/performance optimization via time-distance output compression. Expanded test coverage with micro reversal tests and an integration test for turn restrictions with rerouting, alongside documentation clarifications and TODOs for reversing logic.
April 2026
July 2025
1 Commits • 1 Features
Jul 1, 2025July 2025 monthly summary: Delivered targeted Railsim integration testing to validate behavior at a complex 3-way junction. Introduced the microJunctionFlat integration test to stress bidirectional traffic, conflicting paths, dense schedules, and short headways, verifying conflict resolution and resource locking. These efforts improve reliability, reduce production risk, and provide a repeatable framework for validating high-contention scenarios in matsim-libs.
July 2025
1 Commits • 1 Features
Jul 1, 2025July 2025 monthly summary: Delivered targeted Railsim integration testing to validate behavior at a complex 3-way junction. Introduced the microJunctionFlat integration test to stress bidirectional traffic, conflicting paths, dense schedules, and short headways, verifying conflict resolution and resource locking. These efforts improve reliability, reduce production risk, and provide a repeatable framework for validating high-contention scenarios in matsim-libs.
Activity
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Quality Metrics
Correctness90.0%
Maintainability90.0%
Architecture90.0%
Performance90.0%
AI Usage30.0%
Skills & Technologies
Programming Languages
Java
Technical Skills
Integration TestingJavaMATSimRail Simulationalgorithm designintegration testingrail simulationunit testing
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