SynergisticIT Data Engineer Interview Questions

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

RANK vs DENSE_RANK in Leaderboards

Easy

Explain how RANK() and DENSE_RANK() handle ties differently in ordered SQL results such as leaderboards.

Window FunctionsRankingData Wrangling

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Compare Periods with LAG and LEAD

Medium

Explain how LAG and LEAD compare current rows to previous or next periods in time-series SQL analysis.

Window FunctionsLag/LeadDate Functions

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Design SCD Type 1 and 2

Medium

Design and implement SCD Type 1 and Type 2 dimensions with history tracking, idempotent loads, and data quality controls.

slowly changing dimensionsData ModelingBackfilling

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ETL vs ELT Trade-offs

Easy

Compare ETL and ELT, and explain when ELT is the better pipeline pattern.

ETLELTData Modeling

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Parsing CSV, JSON, Parquet

Medium

Tests your ability to ingest and transform multiple data formats in code.

Hash TablesArraysStrings

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Python Lists vs Dictionaries

Easy

Tests your understanding of core Python data structures and performance implications.

Hash TablesMathArrays

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