valhalla/valhalla
Nov 2024 – Feb 2026
3 Months active
Languages Used
C++
Technical Skills
BenchmarkingBug FixingC++API DevelopmentBackend DevelopmentC++ development
David Nesbitt
PROFILE
David Nesbitt
During a three-month period, Daniel Nesbitt enhanced the valhalla/valhalla routing engine by delivering a targeted feature and two critical bug fixes. He implemented a grade clamping mechanism for bridges and tunnels, ensuring route grades remain within safety limits and improving routing accuracy. Daniel also addressed correctness issues in benchmarking tools by fixing geospatial data construction and stabilizing benchmark runs. Additionally, he improved the TimeDistanceMatrix API to handle partial requests more reliably, assigning zero distances to unsettled destinations. His work demonstrated strong C++ development, algorithm design, and backend engineering skills, with careful attention to edge cases and code quality.
Overall Statistics
Feature vs Bugs
33%Features
Repository Contributions
3Total
Bugs
2
Commits
3
Features
1
Lines of code
35
Activity Months3
Your Network
31 peopleWork History
February 2026
1 Commits • 1 Features
Feb 1, 2026February 2026 monthly highlights for the valhalla/valhalla repo focused on enhancing routing safety and accuracy with a targeted feature delivery. The main deliverable was a grade clamping mechanism for bridges and tunnels to ensure weighted route grades stay within defined safety limits, reducing the risk of unsafe routing decisions on critical segments.
1 Commits • 1 Features
Feb 1, 2026February 2026 monthly highlights for the valhalla/valhalla repo focused on enhancing routing safety and accuracy with a targeted feature delivery. The main deliverable was a grade clamping mechanism for bridges and tunnels to ensure weighted route grades stay within defined safety limits, reducing the risk of unsafe routing decisions on critical segments.
February 2026
September 2025
1 Commits
Sep 1, 2025In September 2025, valhalla/valhalla delivered a critical correctness fix for TimeDistanceMatrix in partial requests. The patch ensures that only settled destinations are considered when computing partial matrices, with unsettled destinations assigned a distance of 0. This removes erroneous distance values in scenarios where some destinations are unreachable or unsettled, improving accuracy for partial-route planning. The change is captured in commit 24734b0d2248c6e5ee016daf6cdd6e89c1c8c050 (“Only return settled destinations for partial TimeDistanceMatrix requests (#5505)”) and is ready for integration. This work enhances reliability, reduces downstream confusion for routing workflows, and demonstrates strong code-quality skills in edge-case handling and git discipline.
September 2025
1 Commits
Sep 1, 2025In September 2025, valhalla/valhalla delivered a critical correctness fix for TimeDistanceMatrix in partial requests. The patch ensures that only settled destinations are considered when computing partial matrices, with unsettled destinations assigned a distance of 0. This removes erroneous distance values in scenarios where some destinations are unreachable or unsettled, improving accuracy for partial-route planning. The change is captured in commit 24734b0d2248c6e5ee016daf6cdd6e89c1c8c050 (“Only return settled destinations for partial TimeDistanceMatrix requests (#5505)”) and is ready for integration. This work enhances reliability, reduces downstream confusion for routing workflows, and demonstrates strong code-quality skills in edge-case handling and git discipline.
November 2024
1 Commits
Nov 1, 2024November 2024: Focused on reliability and correctness of benchmarking tooling in valhalla/valhalla. Delivered a critical bug fix in valhalla_benchmark_loki: corrected latitude/longitude order for PointLL construction and set a default reach option to ensure benchmarks run reliably. This change, committed as c4681ef12d2ce62f63a07dfd230fd6adad3ff38c (#4981), was integrated into valhalla/valhalla. Impact: more accurate benchmark results, fewer flaky runs, enabling better performance assessments and planning. Technologies/skills demonstrated: geospatial data handling, C++ debugging, benchmarking tooling, and Git-based collaboration.
1 Commits
Nov 1, 2024November 2024: Focused on reliability and correctness of benchmarking tooling in valhalla/valhalla. Delivered a critical bug fix in valhalla_benchmark_loki: corrected latitude/longitude order for PointLL construction and set a default reach option to ensure benchmarks run reliably. This change, committed as c4681ef12d2ce62f63a07dfd230fd6adad3ff38c (#4981), was integrated into valhalla/valhalla. Impact: more accurate benchmark results, fewer flaky runs, enabling better performance assessments and planning. Technologies/skills demonstrated: geospatial data handling, C++ debugging, benchmarking tooling, and Git-based collaboration.
November 2024
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Quality Metrics
Correctness86.6%
Maintainability80.0%
Architecture73.4%
Performance66.6%
AI Usage20.0%
Skills & Technologies
Programming Languages
C++
Technical Skills
API DevelopmentBackend DevelopmentBenchmarkingBug FixingC++C++ developmentalgorithm designsoftware engineering
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