Duane Gearhart
Senior Software Engineer at Mapbox
Pennsylvania, United States
Summary
🤩
Rockstar🎓
Top SchoolDuane Gearhart is a senior software engineer with over two decades of experience and a focused 11-year run at mapping and routing companies, currently building location services at Mapbox. He combines deep backend expertise in C++, Java, SQL and Linux with hands-on work in routing engines—having been a core contributor to the open-source Valhalla project that improves OpenStreetMap-based transit and narrative routing. Duane has a strong track record of shipping production navigation features (alternate/draggable routes, time-sensitive routing, TTS guidance) and performance-tuning complex algorithms like Dijkstra’s in real-world systems. Comfortable across telecom, defense, and consumer mapping domains, he brings both rigorous academic training (MS/BS in Computer Science) and a habit of relentless, test-driven improvements. Known as a thought leader and mentor, he pairs analytical problem-solving with a practical focus on quality and user-centered direction text. An eclectic detail: beyond routing logic he’s contributed narrative-quality improvements such as multi-cue instructions and richer transit phrasing that directly improve driver and rider experiences.
11 years of coding experience
25 years of employment as a software developer
BS, Computer Science, BS, Computer Science at Penn State UniversityJohns Hopkins University
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (10)
url-routing10
c-language10
cprogramming-language10
protobuffer10
protobuf10
testing9
data-structure9
algorithm9
data-structures9
algorithms9
Programming languages (7)
Github contributions (5)
valhalla/valhalla
Nov 2014 - Feb 2022
Open Source Routing Engine for OpenStreetMap
Role in this project:
Back-end Developer
Back-end DeveloperContributions:10 releases, 221 reviews, 2294 commits in 7 years 4 months
Contributions summary:Duane's contributions focused on enhancing the Valhalla routing engine, specifically related to transit-based route calculations. The commits added unit tests for transit-related phrases in the narrative builder to improve the quality of direction text output. The user has been involved in implementing functionality for handling features like multi-cue instructions and more efficient routing options.
osrmmulti-modalnominatimtileddijkstra
valhalla/odin
Jan 2015 - Feb 2017
Contributions:428 PRs, 838 pushes, 7 branches in 2 years 1 month
the-graphimprovedgraphpathdirections
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