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Product CaseML Case
4 years ago
What have been the primary factors influencing company's ride requests over the past few years?
Data Scientist

Slack

Square

Quantcast

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4 years ago
Behavioral
4 years ago
In your opinion, what are your top three personal qualities that help you succeed? How do those traits align with Slack's values?
Data Scientist

Slack

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4 years ago
Coding
4 years ago
Join two sorted arrays to form another sorted array.
Data Scientist

Slack

Palo Alto Networks

Square

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4 years ago
Behavioral
4 years ago
What do you do to earn trust from your team?
Data ScientistEngineering ManagerUX DesignerUX Researcher

Slack

Gupshup Logo

Gupshup

RentoMojo Logo

RentoMojo

+1

我会主动和组内的成员进行沟通,遇到风险或者问题及时上报,同时我也会考虑是否有我可以帮的上组内工作的方面

在我刚加入我们团队对产品移动端重构的过程中,我发现大家在移动端设备的调试上不够熟悉,团队选择使用的是chrome的模拟工具,但是在不同设备的兼容问题的解决上效率很低。发现了这个问题之后,我向组内的资深工程师咨询,掌握了我们的项目的构建和调试方案,通过提供fiddler,charles脚本和文档的形式,分享给整个组一套切实有效的移动端调试方案,提升了组内的mobile debug效率。之后,团队变得更信任我,在我做为新人的情况下,主动让我负责了更复杂的项目。

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4 years ago
ML Knowledge
4 years ago
What distinguishes the convergence of stochastic gradient descent from that of gradient descent?
Data Scientist

Slack

Zillow Logo

Zillow

ByteDance Logo

ByteDance

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4 years ago
StatisticsCoding
4 years ago
What are percentiles, and how would you go about computing the nth percentile of a dataset? Could you write the code for it?
Data Scientist

Slack

Ticketmaster Logo

Ticketmaster

Robinhood Logo

Robinhood

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4 years ago
Statistics
4 years ago
How would you differentiate between parametric and non-parametric statistical approaches, and what implications do these differences have in data analysis?
Data Scientist

Slack

Datadog Logo

Datadog

Careem Logo

Careem

Parametric means that the underlying distribution of the data is typically normal, and assumes a specific data distribution. Parametric assumptions are required for tests like the two sample t-test, ANOVA, and pearson's coefficient. While non-parametric just means that the distribution of does not follow a specific "standard" distribution, (ie a heavy tail when a test assumes normal). Tests for these are typically Wilcox rank sum and etc

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4 years ago
Statistics
4 years ago
What fundamental principles define normal and Poisson distributions, and what sets them apart?
Data Scientist

Slack

InVision Logo

InVision

Andela Logo

Andela

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4 years ago
Behavioral
4 years ago
Describe a time when you provided assistance to a colleague. How did the interaction turn out?
Data ScientistFull Stack Software EngineerProduction EngineerFrontend Engineer

Slack

Palantir Technologies Logo

Palantir Technologies

Rebel Foods Logo

Rebel Foods

+4

Question: Tell me about a time when you assisted a colleague in his work. What was the result?

Answer:

Sure. I really enjoy helping others on the team, especially when they’re stuck and not sure how to move forward.

S – Situation:
Once, someone on a neighboring team was struggling with a production issue for a few days. I noticed that he seemed frustrated and wanted help, but didn’t quite know how to ask.

T – Task:
After finishing my work early one day, I proactively messaged him on Teams and offered support. He was happy, but mentioned he wasn’t even sure how to describe the problem clearly.

A – Action:
So I sat down with him and tried to understand the issue. He told me that after one of his code changes went live, a dropdown component in our shared UI broke — its layout was completely messed up, even though his change didn’t touch that component directly.
I helped him debug the issue step by step. After ruling out rendering or layout bugs, I noticed the problem was actually due to a CSS variable conflict — the styles weren’t properly isolated, which caused unexpected overrides.
Together, we fixed the CSS scoping issue and verified the dropdown worked as expected.

R – Result:
The bug was resolved and the fix was shared with the wider team via email, to prevent similar issues in the future. My teammate was really grateful, and after that, our collaboration improved significantly.

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4 years ago
ML Knowledge
4 years ago
How do batch normalization and dropout techniques improve neural network performance?
Data Scientist

Slack

LendingClub Logo

LendingClub

Atlassian Logo

Atlassian

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4 years ago

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*All interview questions are submitted by recent Slack Data Scientist candidates, labelled and categorized by Prepfully, and then published after being verified by Data Scientists at Slack.

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