Delta Air Lines Senior Data Scientist Interview Questions and Answers

Q1. How regularisation works in random forest
Ans. 
Regularisation in random forest helps prevent overfitting by controlling the complexity of the model.
• Regularisation in random forest is achieved by limiting the depth of the trees in the forest.

• It helps prevent overfitting by reducing the complexity of the model and improving generalization.

• Regularisation parameters like max_depth, min_samples_split, and min_samples_leaf can be tuned to control the complexity of the mo...read more
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Python, sql were asked, 1st round was resume based round

Q1. Node js working in detail
Ans. 
Node.js is a runtime environment that allows you to run JavaScript on the server side.
• Node.js is built on Chrome's V8 JavaScript engine.

• It uses an event-driven, non-blocking I/O model that makes it lightweight and efficient.

• Node.js is commonly used for building server-side applications, APIs, and real-time applications.

• It has a large ecosystem of libraries and frameworks, such as Express.js and Socket.io.
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Q2. Timer working in node
Ans. 
In Node.js, timers can be implemented using functions like setTimeout() and setInterval().
• Use setTimeout() to execute a function once after a specified delay

• Use setInterval() to execute a function repeatedly at a specified interval

• Clear a timer using clearTimeout() or clearInterval()

• Example: setTimeout(() => { console.log('Timer executed!'); }, 2000);
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Q1. HLD questions on db and backend
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Q2. Relational non relational db
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Data analysis , SQL, python, ML

Excellent performance

Q1. Tell me about your self
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Q2. Are you comfortable to position
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Q1. Role Relevant Experience
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Q2. Reason For Leaving Previous
Ans. 
I left my previous position to seek new challenges and opportunities for professional growth in a dynamic environment.
• I felt that I had reached a plateau in my previous role and was eager to take on more responsibilities.

• The company was undergoing significant changes, and I wanted to be part of a more stable and innovative organization.

• I was looking for a position that aligned more closely with my career goals and pers...read more
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Q1. Power bi project experience, basics of sql, technical documentation
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Q1. Discussion related to Salary and Date of joining
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Q1. SQL question was asked
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Q2. Business acumen
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Q1. Work I do in my company.
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Q2. Questions related to assignment.
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