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Donatech Corporation Interview Questions

A/B Testing

Algorithms

Analytics

Machine Learning

Probability

Product Metrics

Python

Statistics

Donatech Corporation Interview Guides

Suppose there exists a new airline named Jetco that flies domestically across North America. Jetco recently had a study commissioned that tested the boarding time of every airline, and it came out that Jetco had the fastest average boarding times of any airline.

What factors could have biased this result, and what would you look into?

What could potentially bias the average boarding time in favor of an airline that only flies domestically?

What could potentially bias the average boarding time in favor of an airline that only flies domestically?

Boarding Times Bias

A new airline came out as the fastest average boarding times compared to other airlines.  What factors could have biased this result and what would you look into?

You are testing hundreds of hypotheses with many t-tests. What considerations should be made?

What is a key disadvantage of the F-test when compared to multiple t-tests?

What is a key disadvantage of the F-test when compared to multiple t-tests?

Hundreds of Hypotheses

You are testing hundreds of hypotheses with many t-tests. What considerations should be made?

Let’s say you work for a social media company that has just done a launch in a new city. Looking at weekly metrics, you see a slow decrease in the average number of comments per user from January to March in this city.

The company has been consistently growing new users in the city from January to March.

What are some reasons why the average number of comments per user would be decreasing and what metrics would you look into?

What metric could be used to measure if active users are still engaging on the platform despite an overall decrease in the average number of comments per user?

What metric could be used to measure if active users are still engaging on the platform despite an overall decrease in the average number of comments per user?

Decreasing Comments

How would you investigate a decline in the average number of comments per user?

<h3>Job Description</h3><div>Job Description<div>Description:<ul><li>At least 5 years overall software development. Must have PLM (PTC Windchill) experience.</li><li>Programming / scripting skills with an object orientated language (Java) and web programming (HTML, JSP, JavaScript).</li><li>Installation, Administration, Upgrade, Integration, Configuration, Performance Tuning experience of PLM software tools (PTC Windchill).</li><li>Experience working in an Agile software development product team.</li><li>Experience with integrating PLM with other enterprise systems such as ERP or MES and Model-Based Systems Engineering (MBSE) applications.</li><li>PTC Windchill/ThingWorx/CREO support experience.</li><li>REST/Odata Experience.</li></ul> Required Experience:<ul><li>At least 5 years overall software development. Must have PLM (PTC Windchill) experience.</li><li>Programming / scripting skills with an object orientated language (Java) and web programming (HTML, JSP, JavaScript).</li><li>Installation, Administration, Upgrade, Integration, Configuration, Performance Tuning experience of PLM software tools (PTC Windchill).</li></ul> Desired skills :<ul><li>Full Stack Engineering/DevSecOps & (CI/CD) process and tools.</li><li>Linux and Windows Administration experience.</li><li>Advanced Level Experience with PTC Windchill Products.</li><li>Knowledge and experience with the Aerospace and Defense business.</li><li>RDBMS experience - Oracle or SQLServer</li></ul> </div></div>

Question	Topic	Difficulty	Ask Chance
Boarding Times Bias	Statistics	Medium	Very High
Hundreds of Hypotheses	Statistics	Medium	Very High
Decreasing Comments	Product Metrics	Easy	Very High

Donatech Corporation Interview Questions

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