Prepare for and practice interview questions from Ipg Photonics.

Ipg Photonics Interview Questions

Ipg Photonics Interview Guides

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?

Ipg Photonics Salaries by Position

IPG Photonics is revolutionizing the laser industry as the pioneering developer and leading producer of fiber lasers and amplifiers. Headquartered in Marlborough, MA, IPG has over 6,500 employees in more than 30 locations around the world. We aspire to work together with our employees and customers to apply light in ways that improve life. Our mission is to develop innovative laser solutions to make the world a better place. To accomplish this mission, we are committed to attracting and retaining the best talent and an engaged, diverse, and thriving workforce that drives a sustainable future for our company and society. Working at IPG Photonics you can expect challenging projects, a motivating and friendly environment, and competitive benefits. Our Laser Diode Division in Oxford, MA is hiring a skilled and motivated C# Web Forms ASP.NET Software Developer. The ideal candidate will be responsible for designing, developing, and maintaining desktop and web applications using C#, ASP.NET Web Forms, Win Forms, DevExpress, MS SQL, and Entity Framework. This role requires strong programming skills, a deep understanding of web development principles, and a passion for delivering high-quality software solutions. Responsibilities: <ul><li>Develop, maintain, and enhance desktop and web applications.</li><li>Design and implement user interfaces, web services, and database-driven functionality.</li><li>Design, develop, and maintain MS SQL Server databases, tables, stored procedures, and functions.</li><li>Perform code reviews, debugging, and troubleshooting to ensure application performance, reliability, and security.</li><li>Implement best practices for software development, code optimization, and system documentation.</li><li>Support the PDB (MES) system.</li></ul> Requirements: <ul><li>Bachelor's degree in Computer Science, Engineering, or a related field (or equivalent experience)</li><li>Proven experience in C#, ASP.NET Web Forms, MS SQL Server, Entity Framework, and web development technologies</li><li>Experience with DevExpress controls and tools</li><li>Strong understanding of object-oriented programming principles and design patterns</li><li>Strong knowledge of MS SQL Server, T-SQL, and database development tools</li><li>Experience with version control systems (e.g., Git)</li></ul>

IPG Photonics is revolutionizing the laser industry as the pioneering developer and leading producer of fiber lasers and amplifiers. Headquartered in Marlborough, MA, IPG has over 6,500 employees in more than 30 locations around the world. We aspire to work together with our employees and customers to apply light in ways that improve life. Our mission is to develop innovative laser solutions to make the world a better place. To accomplish this mission, we are committed to attracting and retaining the best talent and an engaged, diverse, and thriving workforce that drives a sustainable future for our company and society. Working at IPG Photonics you can expect challenging projects, a motivating and friendly environment, and competitive benefits. We are seeking an experienced Senior Software Engineer to join our dynamic team. As a key contributor, you will play a critical role in designing, developing, and optimizing complex math libraries. Your work will empower cutting-edge applications across various domains. As a Senior Software Engineer, you collaborate with a team of skilled engineers to create cutting-edge software solutions. Your focus lies in developing software for controllers and peripherals used in fiber-based lasers and delivery systems. Your expertise contributes to advancing technology and ensuring seamless functionality in these critical systems. Responsibilities: <ol><li>New Product Development and Enhancement:</li></ol><ul><li>Spearhead the creation of innovative software solutions for new products.</li><li>Collaborate with cross-functional teams to ensure seamless integration of software components.</li><li>Continuously enhance existing products by implementing feature upgrades and optimizations.</li></ul><ol><li>Project Management and Documentation:</li></ol><ul><li>Lead project initiatives, defining clear objectives and milestones.</li><li>Create detailed specifications for software designs, ensuring alignment with project goals.</li><li>Produce comprehensive documentation to guide development, testing, and maintenance.</li></ul><ol><li>Design Maintenance and Updates:</li></ol><ul><li>Regularly review and improve existing software designs.</li><li>Address issues, enhance performance, and adapt to evolving requirements.</li></ul> Maintain a robust codebase, ensuring reliability and longevity of software systems. <ul><li>5+ years of experience in C++ programming</li><li>Holds an BS or higher (MS preferred) degree in Computer Science, Computer Engineering, Mathematics, or an equivalent field.</li><li>Possesses excellent hands-on technical skills.</li><li>Demonstrates the ability to specify and understand electrical hardware interfaces.</li><li>Has experience with manufacturing test and automation programming methodologies.</li><li>Exhibits excellent technical writing skills, producing high-quality engineering documents.</li><li>Strong communication skills are essential for collaborating within the group, interacting with internal customers, and engaging with colleagues across the Americas and Europe.</li><li>Strong problem-solving abilities and analytical thinking</li></ul> Experience in One or More Areas a Plus: <ul><li>Visual Studio</li><li>Unix/Linux</li><li>Software based control systems</li></ul>

Ipg Photonics Interview Questions

Ipg Photonics Interview Guides

Ipg Photonics Interview Questions

Ipg Photonics Salaries by Position

Ipg Photonics Opening Jobs