IT Career Guides & Free Resources
Expert roadmaps, tutorials, salary guides and interview prep across Data Science, Generative AI, Python, Cloud & Analytics — written by GloryTecks trainers in Hyderabad.
All articles
PySpark Interview Questions with Examples
PySpark interview questions test the API details that decide whether a job is correct and fast. Seven are answered on a real two-million-row electricity file that fights back: a placeholder that turns numbers into strings, dates without leading zeros that Spark 3 will not parse, and a UDF that drags rows into Python.
Redshift Interview Questions and Answers
Redshift interviews keep returning to two design choices: how rows are distributed across slices, and how they are sorted. Both are modelled here on three million real taxi trips, showing a distribution key that leaves five of eight slices idle, a join that moves 87.5% of rows, and a sort key that skips most blocks.
Data Analyst Interview Questions and Answers, Part 2: The Metric Investigation Case
One interview round trips up more analysts than SQL: the metric investigation case. 'Cancellations went up six points. Why?' This guide works one real case end to end on public hotel booking data, showing the five steps interviewers look for, from checking the data to splitting mix from rate and finding the driver.
Data Engineering Interview Questions and Answers, Part 2: The Debugging Round
Some data engineering interviews skip theory and hand you a broken query: the numbers are wrong, find out why. This guide reproduces five classic pipeline bugs on real public data, shows the symptom each produces, how to diagnose it quickly and the fix an interviewer expects.
GCP Interview Questions for Data Engineers, Part 2: The Apache Beam Coding Round
Dataflow roles often include a short Apache Beam coding exercise. The tasks are small, but they show whether you think in PCollections and combiners or in loops. Here are five typical tasks, solved and run locally on real data, with what each one tests and the follow-up questions interviewers ask.
Tableau Interview Questions and Answers
Tableau interviews return to one topic more than any other: when each calculation happens. This guide answers the core questions on FIXED, INCLUDE and table calculations, with the Tableau formulas and their results reproduced on a year of real online orders: one filter, two answers, 100% or 2.57%.