valhalla/valhalla
Aug 2025 – Feb 2026
3 Months active
Languages Used
C++PythonLua
Technical Skills
C++Data StructuresFile HandlingRouting AlgorithmsScriptingSoftware Development
Roland Swingler
PROFILE
Roland Swingler
Roland Swingler contributed to the valhalla/valhalla routing engine by delivering targeted improvements focused on routing accuracy and data integrity. Over three months, he implemented a feature and resolved several bugs, including correcting ferry tagging logic and enhancing the robustness of the build extraction test suite. His work addressed UK-specific routing issues by refining administrative data handling and ensuring correct driving side configuration, which improved route reliability for UK users. Roland applied his expertise in C++, Lua, and Python testing, leveraging skills in data structures, backend development, and routing algorithms to deliver well-scoped, maintainable solutions that strengthened the codebase.
Overall Statistics
Feature vs Bugs
25%Features
Repository Contributions
5Total
Bugs
3
Commits
5
Features
1
Lines of code
503
Activity Months3
Your Network
31 peopleWork History
February 2026
2 Commits
Feb 1, 2026February 2026 monthly summary for valhalla/valhalla: Delivered routing correctness fixes focusing on UK driving side configuration and stop-impact calculation for non-intersection nodes, resulting in more accurate and reliable routing behavior. Specific changes were landed via two commits addressing admin-driven UK drive-side configuration and stop-impact regression. These fixes improve routing accuracy for UK contexts, reduce edge-case errors, and strengthen user trust in route planning.
2 Commits
Feb 1, 2026February 2026 monthly summary for valhalla/valhalla: Delivered routing correctness fixes focusing on UK driving side configuration and stop-impact calculation for non-intersection nodes, resulting in more accurate and reliable routing behavior. Specific changes were landed via two commits addressing admin-driven UK drive-side configuration and stop-impact regression. These fixes improve routing accuracy for UK contexts, reduce edge-case errors, and strengthen user trust in route planning.
February 2026
January 2026
1 Commits
Jan 1, 2026In January 2026, delivered a focused bug fix to improve UK administrative data handling in the Valhalla routing engine, enhancing data accuracy and routing reliability for UK-specific administrative regions. The change removes UK country-specific overrides to ensure the correct administrative data is returned, reducing mismatches in geography data used by routing and search components. This work strengthens data integrity and trust in routing results for UK users and downstream systems.
January 2026
1 Commits
Jan 1, 2026In January 2026, delivered a focused bug fix to improve UK administrative data handling in the Valhalla routing engine, enhancing data accuracy and routing reliability for UK-specific administrative regions. The change removes UK country-specific overrides to ensure the correct administrative data is returned, reducing mismatches in geography data used by routing and search components. This work strengthens data integrity and trust in routing results for UK users and downstream systems.
August 2025
2 Commits • 1 Features
Aug 1, 2025August 2025 — Valhalla/valhalla: Focused on correctness and test stability; implemented a critical bug fix to ensure ferries are never tagged as destination-only, and hardened the test suite for build extraction to be more resilient to changes. These efforts improved routing accuracy, reduced potential release risk, and increased CI reliability.
2 Commits • 1 Features
Aug 1, 2025August 2025 — Valhalla/valhalla: Focused on correctness and test stability; implemented a critical bug fix to ensure ferries are never tagged as destination-only, and hardened the test suite for build extraction to be more resilient to changes. These efforts improved routing accuracy, reduced potential release risk, and increased CI reliability.
August 2025
Activity
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Quality Metrics
Correctness98.0%
Maintainability84.0%
Architecture84.0%
Performance86.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
C++LuaPython
Technical Skills
C++C++ developmentData StructuresFile HandlingGraph algorithmsLuaPython testingRouting AlgorithmsRouting algorithmsScriptingSoftware DevelopmentTestingbackend developmentdatabase management
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