Technical proficiency
Check hands-on command of traffic data tooling: Python or R with pandas, SQL against ATSPM or detector archives, ArcGIS or QGIS, Synchro, Vissim, GTFS feeds, INRIX or HERE probe data.
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 pipelines they built, joins probe speeds to signal event logs, and explains volume, occupancy, and travel time index calculations without hedging.