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Happy 2026
This year changed a lot for me.
 • Eltsefon Mark
The right mindset to get a data scientist interview
If you’re preparing for data science interviews and feeling frustrated, exhausted, or questioning your self-worth after a rejection - this post is for…
 • Eltsefon Mark
Interpretation does matter
Interpreting experiment results, whether you’re building a product, running a marketing campaign, or doing research, can be tricky.
 • Eltsefon Mark
How Not to Turn Your 1:1 into a 0:0
1:1s can be the most rewarding meetings - but they can also be wasted time.
 • Eltsefon Mark
When intuition wins over A/B test?
When making choices that affect products, policies, or strategies, it’s important to understand not just what the data says, but how much trust we can…
 • Eltsefon Mark
What actually speed up your A/B Test
We all want to speed up our A/B tests and run them as fast as possible.
 • Eltsefon Mark
7 reasons why your experiments fail
When you first start working with experiments, it feels simple:
 • Eltsefon Mark
What I actually Do as a Data Scientist.
It’s always interesting to peek into a data scientist’s calendar.
 • Eltsefon Mark
Data Marks
A newsletter dedicated to talking about data science, experimentation and how to pass the mark.

Data Marks

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