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Updated weekly · Last refresh Nov 11

Via Transportation Data Engineer Interview Questions

The questions to prepare for a Via Transportation Data Engineer interview. Questions from real interview reports rank first. Updated daily.

13questions
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1
PipelinesStart here. 9 questions · ~73 min
Experience With dbtMedium

Assesses your ability to build and manage analytics transformations using dbt.

data engineeringVia Transportation
Schema Evolution in ETLMedium

Tests strategies for managing breaking changes while keeping pipelines reliable over time.

ETLschema evolutiondata integrityVia Transportation
Fault-Tolerant Data WarehouseHard

Tests architecture decisions for resilience, recovery, and consistent analytics under failure.

data warehousefault toleranceVia Transportation
Partitioning and Indexing StrategyHard

Tests ability to balance cost and latency through physical data layout and access patterns.

indexingVia Transportation
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2
SQL & Data Manipulation3 questions + 3 drills · ~54 min
Modeling for High-Concurrency TransitMedium

Tests data modeling choices for high write/read concurrency in a real-time transit context.

best practicesData ModelingVia Transportation
Production dbt Best PracticesMedium

Tests production-grade dbt practices including testing, documentation, and deployment workflows.

best practicesproductionVia Transportation
Optimizing Query PerformanceHard

Tests performance tuning skills including indexing, partitioning, and query plan optimization.

performancequery optimizationVia Transportation
Data Quality in High-Volume PipelinesHard
Practice
Practice drill

Audit pipeline batches for count mismatches, nulls, duplicates, and invalid values using PostgreSQL aggregation.

Data Qualitydata pipelinedata accuracyLLenmar ConsultingFactored
CDC to Warehouse Data ParityHard
Practice
Practice drill

Reconcile latest CDC customer records with warehouse data and report missing, extra, deleted, or mismatched records.

Data Qualitydata warehousedata validationIntuit
Schema Evolution in WarehousesMedium
Practice
Practice drill

Identify each warehouse table's latest deployed schema version and whether unresolved breaking changes require review.

database managementdata migrationschema evolutionCharles Schwab

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3
More topics1 question · ~8 min
Big O and Hashmaps BasicsMedium

Evaluates understanding of algorithmic complexity and how it impacts data processing performance.

Via Transportation
The finish line: interview-readyComplete all 13 questions plus 3 hands-on drills to finish this plan.