Technical proficiency
Check fluency with PostGIS, GeoPandas, rasterio and Google Earth Engine: ask how they handled CRS reprojection, spatial joins on millions of points, or Sentinel-2 cloud masking.
Evidence to listen for
- Command of the languages, frameworks, and data tools the role actually uses
- Understands correctness, performance, and failure modes, not just syntax
- Has opinions on testing and can justify them
- Reads and reasons about code they did not write
Five-point scoring guide
Cannot work independently; fundamentals are missing.
Weak fundamentals; output needs heavy review.
Competent for the role; needs guidance on complex or unfamiliar work.
Strong practitioner; handles hard problems with little guidance.
Names specific projections, spatial indexes and raster pipelines; explains a real analysis end to end without hand-waving over data prep.