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Decibel Research, Inc. Interview Questions

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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

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?

Decibel Research, Inc. Salaries by Position

deciBel Research has an immediate opening for a GFC Software Engineer in Huntsville, AL. Position Description: The successful Software Engineer will work in a collaborative environment to understand, implement, and test existing and new capabilities and algorithm and modernize and translate Ada code to C++. The algorithms and capabilities that designed for the Engagement Planner team are mathematics and physics based complex systems visible to MDA. The selected candidate will also be expected to support reviews of requirements and test cases that are developed in support of the Engagement Planner. Education Requirements: Bachelor's degree in STEM related field. Experience Requirements: <ul><li>Bachelor's degree in STEM related field, and 5 years of related experience, or a Master's degree with 3 years of related experience, or 0 years with a PhD not to exceed 10 years</li><li>Experience with solving highly mathematical and physics based complex problems</li><li>Experience analyzing and implementing optimization algorithms</li><li>Recent demonstration of Ada or C++ Software Development</li><li>Recent MATLAB and Python Experience</li><li>Must have an Interim or Active Secret Clearance</li><li>Unix/Linux Operating System Experience</li><li>Read and interpret Modeling and Simulation</li><li>Must be able to support an in-person / closed-area work environment</li></ul> Special Skills Desired: <ul><li>Experience with solving highly mathematical and physics based complex problems involving developing fire control solutions</li><li>Highly experience with Linux, scripting, and operations</li><li>Prior experience with Missile Defense Agency (MDA) programs and/or systems</li><li>Experience with automated software requirements testing and analysis</li><li>Experience with Software Containerization and Orchestration (Kubernetes, Helm Charts, Docker)</li><li>Experience with Agile Project Management tools (Jira/Confluence) and DevSecOps tools and methods (Jenkins, Ansible, Git/Gitlab) of continuous integration/continuous delivery and deployment (CI/CD) automation</li></ul> Applicant selected must have an Interim or Active Secret security clearance. Must be a U.S. Citizen.

<h3>Job Description</h3><div>Job Description<div>deciBel Research has an immediate opening for a Junior Software Engineer in Huntsville, AL.Position Description:deciBel Research is seeking a Junior Software Engineer to support design and development activities for both modeling & simulation and tactical software on a combat system fielding and sustainment effort.Day to day activities include:<ul><li>Supporting new capability designs within the Modeling, Simulation, & Analysis (MS&A) System-of-Systems (SoS) representative of the fielded combat system.</li><li>Evaluate performance of advanced algorithms for inclusion in the software baseline</li><li>Contribute to the development of analysis visualization tools</li><li>Perform updates to threat configuration software</li><li>Make updates and fixes to both the MS&A SoS and the tactical combat system software baseline to support sustainment efforts</li></ul>Education Requirements:Bachelor Degree in Engineering, Computer Science, Math, Physics, or related STEM field.Experience Requirements:<ul><li>2 years with Bachelor's Degree; 0 years with Master's degree.</li><li>Familiarity with modeling & simulation (M&S) design and development</li><li>Familiarity with tactical software design and development</li><li>Experience with programming in C++ and Java</li><li>Experience with scripting in Matlab and/or Python</li><li>Familiarity with scrum-based Agile software development processes and tools</li><li>Familiarity with continuous integration/continuous delivery (CI/CD) processes and tools</li><li>Ability to work full time in a classified lab environment</li></ul>Special Skills Desired:<ul><li>Master's degree in a STEM field</li><li>Previous DoD program experience</li><li>Model Based System Engineering experience</li><li>Mission planning experience</li><li>Command and Control (C2) and/or Weapons Control Systems experience</li></ul>Applicant selected must have an active Secret security clearance. Must be a U.S. Citizen. Job Posted by ApplicantPro </div></div>

deciBel Research has an immediate opening for a Software Engineer in Huntsville, AL. Position Description: deciBel Research is seeking an experienced Software Engineer to support the Ground Based Midcourse Defense (GMD) Weapon System (GWS) program to develop software for the In-flight Interceptor Communications System (IFICS) Data Terminal (IDT). Responsibilities Include: <ul><li>Writing code in Ada, C++ and Python</li><li>Creating and running unit tests</li><li>Developing software documentation</li><li>Performing test planning, monitoring, and execution of test activities</li><li>Reviewing and verifying system level and software level requirements</li><li>Developing and executing automated software test cases in the Continuous Integration / Continuous Deployment (CI/CD) pipeline</li><li>Implement software test objectives, success criteria, and required resources for software CSCI level tests and demonstrations</li><li>Collaborating with Stakeholders and Government customer</li><li>Working within a Agile team environment, to include Iteration Planning, Feature and Story development, Sprint Planning, and Iteration Retrospectives</li><li>Participating in demos for the team and program Sprint reviews</li><li>Execution of software qualification and acceptance testing per those requirements, plans and procedures</li><li>Participate in technical exchange meetings, interfacing with customers (internal/external) and contributing to a broad range of program deliverables</li></ul> Education Requirements: Bachelor's degree in STEM discipline Experience Requirements: <ul><li>5 years with Bachelor's degree; 3 years with Master's degree; 0 years with PhD (not to exceed 10 years)</li><li>Recent Experience with automated software requirements testing and analysis</li><li>Recent Experience with Software Containerization and Orchestration (Kubernetes, Helm Charts, Docker)</li><li>Recent Experience with DevSecOps and Jenkins continuous integration/continuous delivery and deployment (CI/CD) automation</li><li>Unix/Linux Operating System Experience</li><li>Ada/C++/Java/ Software Development experience</li><li>Understanding of Modeling and Simulation</li><li>Must be able to support an in-person, closed-area work environment 100% of the time</li></ul> Special Skills Desired: <ul><li>Experience using DevSecOps tools and methods (Jenkins, Ansible, Git/Gitlab)</li><li>Experience using Agile Project management tools (Jira/Confluence)</li><li>Experience in Product Owner or Scrum Master roles</li><li>Advanced experience developing Automation tools and test cases</li><li>Advanced experience with Linux, scripting, and operations</li><li>Prior experience with Missile Defense Agency (MDA) programs and/or systems</li><li>Advanced experience with automated software requirements testing and analysis</li><li>Advanced experience with Software Containerization and Orchestration (Kubernetes, Helm Charts, Docker)</li><li>Advanced experience with DevSecOps and Jenkins continuous integration/continuous delivery and deployment (CI/CD) automation</li></ul> Applicant selected must have an active Secret security clearance. Must be a U.S. Citizen.

Decibel Research, Inc. Interview Questions

Decibel Research, Inc. Interview Guides

Decibel Research, Inc. Interview Questions

Decibel Research, Inc. Salaries by Position

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