Medium LeetCode DSA
Out loud, in order: clarify, build it, check it, explain it.
Practise SQLLoadingone moment…
Data engineering interview · Media, Streaming & Telecom
Four rounds (DSA + SQL window, project + Spark, optimization, HR) with deep project knowledge and Spark tuning.
01
And what its data engineers work with.
02
Stages in the order candidates meet them.
5 stages. 3 rounds have reported questions, described below.
03
The topics it covers and the questions candidates reported.
2 reported questions. See them below
2 reported questions. See them below
1 reported question. See them below
04
By round. Questions marked Expected are written from the company's standards.
DSA + SQLMedium confidence
Project + SparkMedium confidence
Project + OptimizationMedium confidence
Nobody reported these exact questions at Jio. They are the questions a loop for each of its top topics is known to ask, so prepare for them as likely, not as confirmed.
05
Ranked by how much of the evidence points at each topic.
06
Do the first group before the second.
Know your projects cold
Do first (3)Spark optimization
SQL window functions; DSA (LeetCode easy–medium)
Python/Pandas; Azure basics
Then07
Why candidates were turned down, as reported.
Shallow project knowledge
Weak Spark optimization
Spark is named in 25 of 50 company accounts.Cannot write SQL window queries
SQL is named in 37 of 50 company accounts.08
4 reported, 1 composite. Each opens and closes. Composites are labelled.
Data structures and SQL with windows, then a project talk and Spark coding, then tuning and HR. Know your projects deeply. Spark tuning and SQL windows are core. The interviewers kept a calm, discussion style.
What to take from it Know your projects, Spark tuning and window functions.
Three rounds and seven coding problems in November 2021: an online coding test, a video technical round and HR.
What to take from it Practise a set of coding problems under time.
In 2022 the technical round asked for the deploy modes in Spark, how Spark works through its architecture, and Hadoop topics like MapReduce and HDFS blocks against input splits. Others reported a question on Spark architecture and one on resource allocation.
What to take from it Know Spark architecture and deploy modes by heart.
December 2024: an aptitude test, a coding test on data structures, then HR.
What to take from it Prepare aptitude as well as coding.
Composite walkthroughs. Built from the company's documented loop, not from one person's account.
This is a composite, not one person's account. It is built from the loop we have on record for Jio. Questions reported for this round: Medium LeetCode DSA; SQL window-function queries.
What to take from it Practise these questions before you reach this round.
Project depth + Spark optimization + SQL window functions; loops are more project/coding than formal system design.
09
Their reported questions, one at a time, against a stopwatch.
Medium LeetCode DSA
Out loud, in order: clarify, build it, check it, explain it.
Practise SQL10
Pick your level and the weeks you have.
Built from what Jio asks, strongest first. For the wider basics at your level, follow the Mid level plan alongside it.
Rehearse the Jio loop
Run the question deckThen repeat your weakest topic once more.