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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 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

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

Flexton inc. Salaries by Position

Job Title: SW Engineer II – JavaLocation: Sunnyvale CA - Local to Bay Area candidates only 12+ Months contract. Pay Rate: $40 - $50/hr on w2Retail/eCommerce domain experience is huge plus. Basic Qualifications:<ul><li>2+ years' experience designing and implementing Java backend applications.</li><li>Well versed in data structure and algorithm problems.</li><li>Experience with REST API web services using Spring Boot Framework in Java.</li><li>Excellent oral and written communication skills, with the ability to present to both technical and non-technical audiences.</li></ul>Thanks Upendra

Job Title: Lead Software Engineer - Java- Local to Bentonville ARLocation: Bentonville AR – HybridNeed Local to Bentonville AR candidates only Must have retail/eCommerce domain experience. Basic Qualifications:<ul><li>8+ years' experience designing and implementing Java backend applications.</li><li>Should have experience leading and managing a team. </li><li>Experience in driving a large java-based application migration from one infrastructure to another with architectural changes in design.</li><li>Strong experience in managing / migrating large data sets in Casandra / Cosmos / Big query.</li><li>A strong understanding of system design, data structures, and algorithms.</li><li>Experience working and designing and testing relational database management systems such Azure SQL, and NoSQL databases like Cassandra.</li><li>Experience with REST API web services using Spring Boot Framework in Java.</li></ul> ThanksUpendra

We are seeking a talented and motivated Senior Fullstack Software Engineer to join our development team. The ideal candidate will have a strong background in JavaScript, Node.js, and React, along with experience in either Python or Spring Boot/Java. A solid understanding of NoSQL databases is essential, and knowledge of data structures and algorithms will be highly valued. Responsibilities:<ul><li>Design and develop scalable web applications using JavaScript, Node.js, and React.</li><li>Collaborate with cross-functional teams to define, design, and ship new features.</li><li>Develop RESTful APIs and microservices using Python or Spring Boot/Java.</li><li>Implement and manage NoSQL databases to support application data requirements.</li><li>Optimize application performance and ensure responsiveness to front-end requests.</li><li>Write clean, maintainable, and efficient code while following best practices.</li><li>Participate in code reviews, providing and receiving constructive feedback.</li><li>Stay updated with emerging technologies and industry trends.</li></ul> Qualifications:<ul><li>Bachelor’s degree in Computer Science, Information Technology, or a related field.</li><li>8+ years of experience in full stack development.</li><li>Proficient in JavaScript, Node.js, and React.</li><li>Strong experience with either Python or Spring Boot/Java.</li><li>Solid understanding of NoSQL databases (e.g., MongoDB, Cassandra) and experience with SQL.</li><li>Familiarity with data structures and algorithms.</li><li>Experience with version control systems, preferably Git.</li><li>Strong problem-solving skills and the ability to work independently as well as in a team environment.</li><li>Excellent communication and interpersonal skills.</li></ul> Preferred Skills:<ul><li>Knowledge of containerization technologies (e.g., Docker, Kubernetes).</li><li>Experience with cloud platforms (e.g., AWS, Azure, Google Cloud).</li><li>Familiarity with Agile methodologies and software development life cycle (SDLC).</li></ul>

Job Title: Sr Java developer with nosql and Cloud Duration - Fulltime/ContractSalary - 20 to 25 LPA fixedLocation -Hybrid from Bangalore 5+year exp Back-end / Integration:<ul><li>1 Java Developer with Java and Springboot.</li><li>Strong in DS/Algo</li><li>Any nosql database like Mongo, cassandara needed.</li><li>Exp on cloud (Aws/Azure/Gcp) needed.</li></ul> Shishir

Job Title: Software Engineer II - Java- Local to Bentonville ARLocation: Bentonville AR – HybridNeed Local to Bentonville AR candidates only Must have retail/eCommerce domain experience. Basic Qualifications:<ul><li>6+ years' experience designing and implementing Java backend applications.</li><li>Experience in driving a large java-based application migration from one infrastructure to another with architectural changes in design.</li><li>Strong experience in managing / migrating large data sets in Casandra / Cosmos / Big query.</li><li>A strong understanding of system design, data structures, and algorithms.</li><li>Experience working and designing and testing relational database management systems such Azure SQL, and NoSQL databases like Cassandra.</li><li>Experience with REST API web services using Spring Boot Framework in Java.</li></ul> ThanksUpendra

Flexton inc. Interview Questions

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Flexton inc. Interview Questions

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