Charlie Lefrak
Software Engineer at Mapbox
Burlington, Vermont, United States
Summary
🤩
Rockstar🎓
Top SchoolCharlie Lefrak is a software engineer with 11 years of experience building scalable geospatial and data-processing systems, currently advancing map data quality and tiling workflows at Mapbox. He has deep expertise in PostGIS, raster workflows, GDAL, and cloud-native pipelines—having parallelized topology simplification, aligned administrative datasets to global boundaries, and hardened GeoJSON/mbtiles test coverage. Prior roles at World Resources Institute and Arcadia Power show a consistent focus on large-scale environmental datasets, Hadoop and Google Earth Engine processing, and resilient AWS Lambda/SQS scraper pipelines. Early career work combined GIS automation (ArcPy, Flask APIs) with applied conservation science, reflecting a rare blend of domain knowledge and production engineering. Based in Burlington, Vermont, he brings a pragmatic approach to scaling spatial workflows and a track record of making complex geospatial processing repeatable and testable.
11 years of coding experience
8 years of employment as a software developer
Bachelor's degree Environmental Studies - Conservation Biology, Bachelor's degree Environmental Studies - Conservation Biology at Middlebury College
Stackoverflow
182reputation
4kreached
0answers
5questions
Github Skills (151)
csv-import10
converting10
geojson10
tabular10
csv-parsing10
csv-parser10
csv-reader10
on-the-fly9
topojson9
image-compressor9
developer-tools9
csv9
python9
streamlit9
cpp9
Programming languages (9)
Github contributions (5)
wri/glad-raster-analysis-lambda
Sep 2017 - Nov 2018
POC of using AWS Lambda + Rasterio for raster calculations on S3
Contributions:61 commits, 2 PRs, 53 pushes in 1 year 2 months
rasteriocalculationsrasterserverlessaws-lambda
wri/gfw-annual-loss-processing
Mar 2017 - Apr 2019
Put cum-summed data into an Excel sheet with pivot tables, etc
Contributions:4 PRs, 155 pushes, 5 branches in 2 years
excel-sheetsheetexcelpivot-tables
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