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Lucas Systems Interview Questions

A/B Testing

Algorithms

Analytics

Machine Learning

Probability

Product Metrics

Python

Statistics

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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?

You are testing hundreds of hypotheses with many t-tests. What considerations should be made?

What is a key disadvantage of the F-test when compared to multiple t-tests?

What is a key disadvantage of the F-test when compared to multiple t-tests?

Hundreds of Hypotheses

You are testing hundreds of hypotheses with many t-tests. What considerations should be made?

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?

<h3>Job Description</h3><div>Job Description<div>Description:MUST LIVE WITHIN COMMUTING DISTANCE TO WEXFORD PA Software Engineer - Project Engineering(Mid to Senior Level Opportunities) Seasoned pros, as well as candidates meeting the minimum qualifications below, will be considered for Lucas' growing team. Would you like to collaborate with some of the brightest, most talented software engineers in Pittsburgh AND make a recognizable impact in a profitable, established and growing software solutions company? As a member of the Lucas Project Engineering Team, you could be doing just that! At Lucas, you will be responsible for: designing, developing, documenting, and supporting major components of the next generation of Lucas’ software products. Technologies include software that runs on a variety of leading-edge mobile devices from Zebra, Bluebird, Unitech, Samsung, Etc. About UsFounded in 1998, Lucas is a growing and consistently profitable organization with an expanding global customer base and offices in North America and Europe. We offer a dynamic, collaborative, innovative and entrepreneurial work environment that embraces diversity and continues to create unlimited opportunities for both personal and professional growth for high-performing individuals throughout the United States and Europe. Our culture has been as carefully managed as our growth and our products. We believe in what we do, as much as we believe in each other. We believe in rewarding great thinking and initiative. We attract high-quality people who like to work hard, and they stay with us for many years. Lucas is a hybrid environment - 3 days in office / 2 days from home The skilled Software Engineer will be involved, at varying degrees, in the following:<ul><li>Designing and developing software using MS Visual Studio and C#;</li><li>Designing and developing database components and software modules for Lucas’ software products;</li><li>Extending MS Windows services, IIS, and multi-threaded server and mobile client applications; </li><li>Designing and developing host interfaces using various transfer methods (e.g., REST APIs, TCP Sockets, FTP, etc.);</li><li>Debugging and tuning of applications using Visual Studio, Profiler, and various in-house tools;</li><li>Assisting Lucas’ software services/support team with troubleshooting and developing fixes and enhancements for existing client deployments.</li></ul>At the Senior Level:<ul><li>Working with Lucas Project Managers and customers to gather requirements as well as product stakeholders to build a stronger product offering;</li><li>Working directly with Lucas’ customers to gather requirements and design functional specifications to provide unique solutions that increase efficiency and solve operational challenges;</li><li>Serving sometimes as the technical lead for customer projects, supervising other engineers to meet both internal and external expectations;</li><li>Developing architecture diagrams and software specifications;</li><li>Assisting in the creation of system specifications, systems installations and customer training;</li><li>Coordinating and conducting user testing and training;</li><li>Developing prototypes for R&D evaluation; and</li><li>Evaluating new software tools.</li></ul>Requirements:<ul><li>Bachelor’s degree in Software Engineering, Computer Science, or related discipline together with related practical software engineering experience is required.</li><li>Object-oriented programming (preferably C#.NET) and database skills (preferably SQL Server).</li><li>Experience with Angular and event-driven microservice architectures preferred but not required. </li><li>Commitment to producing high quality, well-designed and flexible applications.</li><li>Solid troubleshooting, analytical, and organizational skills with attention to detail.</li><li>Dedication to collaborative working style and desire to learn and adopt new technologies.</li><li>Excellent verbal and written communication skills.</li><li>Ability to travel occasionally (up to 15% applicable for Tech Leads; not applicable for all Software Engineering roles though some travel expected for all).</li></ul>Additional Valued Experience:Experience with Warehouse Management Systems (WMS) or other supply chain software solutions; systems that include mobile devices; Android development</div></div>

Question	Topic	Difficulty	Ask Chance
Boarding Times Bias	Statistics	Medium	Very High
Hundreds of Hypotheses	Statistics	Medium	Very High
Decreasing Comments	Product Metrics	Easy	Very High

Lucas Systems Interview Questions

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Lucas Systems Interview Questions

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