
LeetCode
StrataScratch
Data Interview Q's
InterviewSpark
SQLPad.io
DataDriven.io is a free interview prep platform built specifically for data engineers. Practice all five interview rounds: SQL, Spark Python, data modeling, pipeline architecture; in real execution environments with AI mock interviews.

LeetCode
Codility
CodeSignal
Codewars
iMocha
HackerEarth
TestGorilla
HackerRank is a platform that allows companies to conduct interviews remotely to hire developers and for technical assessment purposes.

Which is more popular?
Based on our record, HackerRank seems to be a lot more popular than DataDriven.io. While we know about 67 links to HackerRank, we've tracked only 3 mentions of DataDriven.io.
Website, pricing, platforms and company facts side by side.
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| Website | datadriven.io | hackerrank.com |
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What each product offers, as listed by its team.


Possible disadvantages
Possible disadvantages
An editorial look at what each product does well and who it suits.


Overall verdict
Why this product is good
Recommended for
Overall verdict
Why this product is good
Recommended for
HackerRank is recommended for students, individual learners, and job seekers looking to improve their coding skills, as well as for companies seeking an efficient way to evaluate candidates' technical abilities during the hiring process.
Walkthroughs and reviews on video.
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Is HackerRank A Good Idea?
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How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing DataDriven.io and HackerRank.
DataDriven.io's answer
DataDriven.io's answer
Most data engineering interview prep tools only cover SQL. LeetCode focuses on algorithms that rarely appear in DE loops. DataLemur and StrataScratch are SQL-only. Interview Query is broader but light on Spark, execution, and pipeline architecture design.
DataDriven.io is the only free platform that covers the complete data engineering interview loop, SQL, Python, Spark / PySpark, data modeling, and pipeline design, with real questions from real DE interviews, live code execution, AI mock interviews, company-weighted banks, and adaptive difficulty.
DataDriven.io's answer
Data engineers preparing for technical interviews at top tech companies, from junior to staff level. This includes:
DataDriven.io's answer
Every time I interviewed for a data engineer role, I had to guess what mattered to that company. I crammed random LeetCode problems and walked in unprepared for what they actually asked. The only way to learn how to pass the interview was to fail a few interviews first.
That felt broken. Production data engineering experience does not translate to 45-minute, pattern-based interview rounds under time pressure. So I built DataDriven.io, the free data engineering interview prep platform I wish I'd had: real interview questions sourced from actual DE loops across SQL, Python, Spark, data modeling, and pipeline architecture, with live code execution, AI mock interviews, and question banks weighted by what each company actually asks.
DataDriven.io's answer
DataDriven.io's answer
Share your experience with using DataDriven.io and HackerRank. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


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What are LeetCode and LeetCode alternatives good for?LeetCode💡Interested in leveling up your career? Apply to the Formation Fellowship...
HackerRank’s challenges cover a wide range of topics and difficulty levels, allowing developers to enhance their problem-solving skills and learn new algorithms and data structures. The competitive nature of...
HackerRank offers a wide array of challenges across various domains such as algorithms, mathematics, SQL, and functional programming. Its interface is user-friendly, and the platform provides detailed feedback on...
Recommendations tracked on public social media and blogs since March 2021.


If you're prepping for interviews specifically, that's the whole reason datadriven.io has data engineering interview questions covering the exact patterns that show up in these loops, from SQL and Python to system design and behavioral... - Source: dev.to / 3 months ago
And above all: study the concepts, not the tools. Data modeling, query optimization, understanding why things break. That's the study plan. Tools change every 18 months; the problems don't change. Schema drift, late-arriving data,... - Source: dev.to / 3 months ago
Interviewing is a separate skill from the actual job, and the bar has shifted. If you want to pressure-test where you stand, that's exactly why we built out our datadriven.io data engineer interview questions around architectural... - Source: dev.to / 4 months ago
This way, you transfer what you already know (problem-solving) but only change the syntax. Platforms like Hackerrank are also great to solve the same problem in different languages and learn from other people’s solutions. - Source: dev.to / about 1 year ago
Firstly, solve some common data structure problems with it. Implement some data structures like arrays, linked lists, stacks, queues, etc. You can check common problems on LeetCode, Hackerank or some other resources. - Source: dev.to / over 2 years ago
I don't have a consecutive internet connection and I can't keep up learning process so I started practicing in hackerrank.com I have started some challenges in python and c++ there. Thus I have no internet connection so I cannot practice... Source: almost 3 years ago
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