
HackerRank
CodeSignal
iMocha
TestGorilla
HackerEarth
mettl
HireVue
Codility provides a SaaS platform with advanced validation, security and protection features to evaluate the skills of software engineers.

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.

Which is more popular?
Based on our record, DataDriven.io should be more popular than Codility. It has been mentioned 3 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | codility.com | datadriven.io |
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In their own words, as submitted to SaaSHub.


The Codility platform includes: CodeCheck - Design role-specific remote skills assessments to screen your technical candidates before moving them to the interview stage. CodeLive - Host technical remote or onsite interviews via our shared editor using a range of templates and whiteboards....
No description of DataDriven.io yet.
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.


No analysis of Codility yet.
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
An Introduction to Codility: The Tech Hiring Platform for Engineering Teams
No DataDriven.io videos yet. You could help us improve this page by suggesting one.
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing Codility and DataDriven.io.
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 Codility and DataDriven.io. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


Codility is a platform that helps companies assess the coding skills of developers. They offer a range of online coding tests and assessments that enable employers to evaluate candidates' technical abilities.
We have no reviews of DataDriven.io yet. Be the first one to post
Recommendations tracked on public social media and blogs since March 2021.


- Technical skills: have they got the walk to match the talk? Programming languages on a resume mean little if candidates are unable to demonstrate their hard coding skills. You can test these skills with technical skill tests, such as... - Source: dev.to / over 2 years ago
Codility : Verify and improve coding skills. - Source: dev.to / over 5 years ago
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
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Get better at data science interviews
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