Top 16

Prep plan

Updated weekly · Last refresh Oct 17

BILL Data Engineer Interview Questions

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

16questions

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CodingStart here. 5 questions · ~51 min

First Non-Repeating CharacterEasy

Practice

Find the first non-repeating character in a string using frequency counting and a second pass in O(n) time.

Hash TablesStringsSearching

BILL

Python, SQL, Spark FundamentalsMedium

Evaluates your practical fundamentals across Python, SQL, and Spark for data engineering work.

sqlpythonspark

BILL

Parse Payment Logs and MetricsMedium

Practice

Parse payment-event CSV logs, skip corrupted rows, and aggregate valid completion and failure metrics.

aggregationjson parsingData Wrangling

BILL

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Pipelines4 questions · ~41 min

Handle PySpark Data SkewMedium

Approach for detecting and mitigating skew in PySpark pipelines using partitioning, join strategies, and runtime monitoring.

Data Qualitypysparkdata skewness

BILL

Real-Time Payment ETL to Data LakeHard

Tests system design for real-time ingestion, reliability, and scalable data lake pipelines.

data integrationStream ProcessingETL

BILL

PySpark OOM Aggregation TuningHard

Tests practical PySpark performance tuning and memory management for large aggregations.

Performance TuningsparkAggregations

BILL

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SQL & Data Manipulation4 questions + 3 drills · ~71 min

Star vs Snowflake for Sales AnalyticsMedium

Compare star and snowflake schemas for warehouse design, including trade-offs in normalization, query simplicity, and analytics performance.

JoinsData WranglingGroup By

BILL

Paid Late and Avg DelayMedium

Tests SQL joins, date logic, and aggregation to measure payment timeliness.

Date FunctionsJoinsAggregations

BILL

SQL for Operational Trend AnalysisMedium

Practice

Practice drill

Join operational tables and calculate weekly transaction volume, ticket resolution time, and transaction failure rate.

Date FunctionsJoinsGroup By

BILL

Top Users by Transaction AmountEasy

Practice

Practice drill

Return the 10 users with the highest total transaction amounts using aggregation and joins.

JoinsRankingGroup By

BILL

Inner Join vs Outer JoinEasy

Practice

Practice drill

Demonstrate how INNER JOIN and FULL OUTER JOIN handle matching and unmatched rows.

JoinsData Wranglingnull values

Rocket

NeenOpal

eBay

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Behavioral & Leadership3 questions · ~31 min

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The finish line: interview-readyComplete all 16 questions plus 3 hands-on drills to finish this plan.