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<p>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.</p>

<p>How would you assess the validity of the result?</p>


Experiment Validity

<p>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.</p>

<p>Write a query to randomly sample a row from this table.</p>

<p><strong>Input:</strong></p>

<p><code>big_table</code> table</p>

<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

<p>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.</p>

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

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


<p>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?</p>

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?

Independent Software Salaries by Position

<h3>Job Description</h3><div>Job Description<div><b>What you will be doing!</b><br><br>As a Data Analyst the candidate will contribute to completion of specific programs and projects and apply mathematical calculations to recommend solutions to technical problems of high complexity. Chosen candidate will model and evaluate potential impact of data changes. <br><br><b> Requirements: </b><ul><li>Reviewing tickets for potential reconciliation.</li><li>Reviewing tickets for adherence to ticketing handling rules</li><li>Coordinating efforts on focus SLAs to ensure tickets are worked/updated prior to SLA expiration</li><li>Developing innovative strategies </li><li>Analyzing organizational data and conducts advanced statistical analysis</li><li>Data visualization experience and programming experience (e.g. Python, R, VB, JavaScript, C/C++, etc.) desired</li></ul><b>Education and Experience</b>:<br><br>High School Diploma/ Ged and 10 years’ experience or Bachelor of Arts/Bachelor of Science and 5+ years of related experience<br><br><strong>Clearance Required:   Must possess an active TS/SCI with Polygraph security clearance to be considered for this role.</strong><br><br>Independent Software is an Equal Opportunity Employer EOE, M/F/D/V<br /> <p>Powered by JazzHR</p><p>GAlSOP02f7</p></div></div>

<h3>Job Description</h3><div>Job Description<div><b>What you will be doing!</b><br><br>Independent Software seeks a Software Engineer Apprentice to develop, maintain, and enhance complex and diverse software systems (e.g., processing-intensive analytics, novel algorithm development, manipulation of extremely large data sets, real-time systems, and business management information systems) based upon documented requirements. The candidate will work individually or as part of a team. Review and test software components for adherence to the design requirements and document test results. Resolves software problem reports. Utilizes software development and software design methodologies appropriate to the development environment. Provides specific input to the software components of system design to include hardware/software trade-offs, software reuse, use of Commercial Off-the-shelf (COTS)/Government Off-the-shelf (GOTS) in place of new development and requirements analysis and synthesis from system level to individual software components. <br><br><b>Requirements:</b><ul><li>Analyze user requirements to derive software design and performance requirements.</li><li>Debug existing software and correct defects.</li><li>Provide recommendations for improving documentation and software development process standards.</li><li>Design and code new software or modify existing software to add new features.</li><li>Integrate existing software into new or modified systems or operating environments.</li><li>Design or implement complex database or data repository <span class="long-word">interfaces/queries.</span></li><li>Develop or implement algorithms to meet or exceed system performance and functional standards.</li><li>Assist with developing and executing test procedures for software components.</li><li>Design, develop and modify software systems, using scientific analysis and mathematical models to predict and measure outcome and consequences of design.</li><li>Modify existing software to correct errors, to adapt to new hardware, or to improve its performance.</li></ul><b>Education and Experience: </b><br><br>Zero (0) to seven (7) years’ experience as a SWE, on programs and contracts of similar scope and complexity. Bachelor’s degree in Computer Science or related discipline from an accredited college or university. Four (4) years of additional SWE experience on projects with similar software processes may be substituted for a bachelor’s degree.<br><br><b>Clearance Required</b>:  <b> Must possess an active TS/SCI with appropriate Polygraph to be considered for this role.</b><br><br><b><span class="long-word">*********Contingent</span> upon award*********</b><br><br>Independent Software is an Equal Opportunity Employer EOE, M/F/D/V<br /> <p>Powered by JazzHR</p><p>YxBxts2ywL</p></div></div>

<h3>Job Description</h3><div>Job Description<div><p><strong>What you will be doing!</strong></p><p>The Software Engineer develops, maintains, and enhances complex and diverse software systems (e.g., processing-intensive analytics, novel algorithm development, manipulation of extremely large data sets, real-time systems, and business management information systems) based upon documented requirements. Works individually or as part of a team. Reviews and tests software components for adherence to the design requirements and documents test results. Resolves software problem reports. Utilizes software development and software design methodologies appropriate to the development environment. Provides specific input to the software components of system design to include hardware/software trade-offs, software reuse, use of Commercial Off-the-shelf (COTS)/Government Off-the-shelf (GOTS) in place of new development, and requirements analysis and synthesis from system level to individual software components.</p><p><strong>Requirements:</strong></p><ul><li>Analyze user requirements to derive software design and performance requirements</li><li>Debug existing software and correct defects</li><li>Provide recommendations for improving documentation and software development process standards</li><li>Design and code new software or modify existing software to add new features</li><li>Integrate existing software into new or modified systems or operating environments</li><li>Develop simple data queries for existing or proposed databases or data repositories</li></ul><p><strong>Education and Experience:</strong></p><p>No demonstrated experience is required. Bachelors degree in Computer Science or related discipline from an accredited college or university is required; Four (4) years of SWE experience on projects with similar software processes may be substituted for a bachelors degree.</p><p><strong>Clearance Required</strong><strong>:   Must possess an active TS/SCI with Polygraph security clearance to be considered for this role.</strong><br><br>Independent Software is an Equal Opportunity Employer EOE, M/F/D/V</p><p>Powered by JazzHR</p><p>ZOOLrCTBH9</p></div></div>

<h3>Job Description</h3><div>Job Description<div><div><b>What you will be doing!</b><br><br>As a Software Engineer you will develop, maintain, and enhance complex and diverse software systems (e.g., processing-intensive analytics, novel algorithm development, manipulation of extremely large data sets, real-time systems, and business management information systems) based upon documented requirements.  <br><br><b>Requirements:</b><ul><li>Review and test software components for adherence to the design requirements and document test results. </li><li>Resolve software-problem reports</li><li>Utilize software development and software design methodologies appropriate to the development environment</li><li>Provide specific input to the software components of system design to include hardware/software trade-offs, software reuse, use of Commercial Off-the-shelf (COTS)/Government Off-the-shelf (GOTS) in place of new development, and requirements analysis and synthesis from system level to individual software components</li><li>Analyze user requirements to derive software design and performance requirements</li><li>Debug existing software and correct defects</li><li>Provide recommendations for improving documentation and, software development process standards</li><li>Design and code new software or modify existing software to add new features </li><li>Integrate existing software into new or modified systems or operating environments  </li><li>Develop simple data queries for existing or proposed databases or data repositories </li><li>Write or review software and system documentation</li><li>Design or implement complex database or data repository interfaces/queries</li><li>Develop or implement algorithms to meet or exceed system performance and functional standards</li><li>Assist with developing and executing test procedures for software components</li><li>Develop software solutions by analyzing system performance standards, confer with users or system engineers; analyze systems flow, data usage and work processes; and investigate problem areas</li><li>Modify existing software to correct errors, to adapt to new hardware, or to improve its performance</li><li>Design, develop and modify software systems, using scientific analysis and mathematical models to predict and measure outcome and consequences of design</li><li>Key skills in: C, C++, Objective-C, ARM assembly (thumb, 32, 64), generally Posix system interfaces along with Python</li></ul><b>Education and Experience: </b><ul><li> Bachelor’s degree in Computer Science or related discipline from an accredited college or university is required, and seven (7) years of experience as a Software Engineer, in programs and contracts of similar scope, type, and complexity is required. </li><li>Four (4) years of additional SWE experience on projects with similar software processes may be substituted for a bachelor’s degree.</li></ul><b>Clearance Required</b>:  <b> Must possess an active TS/SCI with appropriate Polygraph to be considered for this role.</b><br><br>Independent Software is an Equal Opportunity Employer EOE, M/F/D/V</div><p>Powered by JazzHR</p><p>y5qTJKyEQK</p></div></div>

Independent Software Interview Questions

Independent Software Interview Guides

Independent Software Interview Questions

Independent Software Salaries by Position

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