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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?

Let’s say that your company is running a standard control and variant AB test on a feature to increase conversion rates on the landing page. The PM checks the results and finds a .04 p-value.

How would you assess the validity of the result?

Experiment Validity

Let’s say we have a table with an <code>id</code> and <code>name</code> fields. The table holds over 100 million rows and we want to sample a random row in the table without throttling the database.

Write a query to randomly sample a row from this table.

Input:

<code>big_table</code> table

<table>
<thead>
<tr>
<th>Columns</th>
<th>Type</th>
</tr>
</thead>

<tbody>
<tr>
<td><code>id</code></td>
<td>INTEGER</td>
</tr>

<tr>
<td><code>name</code></td>
<td>VARCHAR</td>
</tr>
</tbody>
</table>

Write a query to randomly sample a row from a big table.

Random SQL Sample

Mphasis Salaries by Position

<ul><li>Overall at least 10+ year of hands-on experience</li><li>Must have at least 5+ years of hands-on experience in below skills:</li><li>React</li><li>ES6</li><li>Redux</li><li>Bootstrap or Material design (either one)</li><li>OOP – Object Oriented Programing </li><li>Unit Testing</li><li>Git</li><li>TypeScript (Good to have)</li><li>Gitlab/GitHub/Bitbucket (Good to have)</li><li>AWS (Good to have)</li></ul> What You'll Do:<ul><li>Maintain existing React product systems, including fixing bugs.</li><li>Install and configure server environments for React deployments.</li><li>Maintain and update project dependencies as well as fix any conflicts.</li><li>Collaborate with other JavaScript developers and software engineers to develop front-end and back-end architecture that’s well-structured and flexible, along with the API's to support it.</li><li>Developing new user-facing features using React.js</li><li>Building reusable components and front-end libraries for future use</li><li>Translating designs and wireframes into high quality code</li><li>Optimizing components for maximum performance across a vast array of web-capable devices and browsers.</li></ul>Expertise You'll Bring:<ul><li>Bachelor’s degree, software development, engineering, or a related technical field.</li><li>Proficient of React and common tools used in the wider React ecosystem, Such as Node.js and npm.</li><li>At least 10+ years’ experience working in front-end development</li><li>Vast experience in developing web-based UI using JavaScript, React.js, and/or Typescript</li><li>Proficiency in popular React tools such as webpack, Redux, Flux, etc.</li><li>Familiarity with debugging problems using appropriate tools</li><li>Knowledge of object-oriented principles, design patterns, and software designing and architecture best practices.</li><li>Both verbal and written communication skills.</li><li>Efficiency in handling technical issues authoritatively, producing new design ideas and substitutions wherever required.</li></ul>

Responsibilities: <ul><li>Develop, maintain, and execute automated test scripts using Selenium.</li><li>Experience in setting up and maintaining dashboards.</li><li>Propose and implement improvements to enhance the testing and monitoring processes.</li><li>Analyze performance metrics and provide insights to development and operations teams.</li></ul> Qualifications: 5 + Yrs. New Relic and Selenium developer with Cloud technologies experience.<ul><li>Proven experience with New Relic for application performance monitoring and optimization.</li><li>Familiarity with CI/CD tools like Jenkins, Git, and Docker.</li><li>Knowledge of cloud platforms (AWS, Azure, GCP) is advantageous.</li><li>Experience in setting up and maintaining dashboards.</li><li>Proficiency in programming languages such as Java/Python/JavaScript.</li><li>Strong expertise in automated testing and development using Selenium.</li></ul>

Mphasis Interview Questions

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Mphasis Interview Questions

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