Koch Business Solutions Business Intelligence Developer Interview Questions and Answers

Q1. DFA Focus :Sorting ,Searching ,Stacks,Queues, HashMaps
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Q2. Os & cn: Process scheduling, TCP/IP, HTTP basics
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Related to basic statistics, and case study on sample design

Q1. Explain the answers of case study on aptitude test
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Q2. Sample design related questions
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Q1. Basic ML Question, Timesereis and RNN with some questions on Comp Vision
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Q1. Project driven. Some coding
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Q1. Salary Discussion
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Q1. How tfidf works in NLP
Ans. 
TF-IDF is a statistical measure used to evaluate the importance of a word in a document.
• TF-IDF stands for Term Frequency-Inverse Document Frequency

• It is used to weigh a word's importance in a document by considering its frequency in the document and across all documents

• The formula for TF-IDF is: TF-IDF = TF * IDF

• TF (Term Frequency) measures how frequently a term appears in a document

• IDF (Inverse Document Frequency) mea...read more
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Q2. What is the difference between group by and window function in sql
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Group by is used to group data based on a column while window function is used to perform calculations on a specific window of data.
• Group by is used to aggregate data based on a specific column

• Window function is used to perform calculations on a specific window of data

• Group by is used with aggregate functions like sum, count, avg, etc.

• Window function is used with analytical functions like rank, lead, lag, etc.

• Group by ...read more
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Q1. Tell me about the project you worked on 4 years back
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Developed a predictive model to forecast customer churn for a telecom company.
• Used machine learning algorithms like logistic regression and random forest.

• Preprocessed and cleaned the dataset by handling missing values and outliers.

• Performed feature engineering to create new variables for better model performance.

• Evaluated model performance using metrics like accuracy, precision, and recall.

• Implemented the model in prod
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Q2. Why are you leaving your current company
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Seeking new challenges and opportunities for growth.
• Looking for a more challenging role that aligns with my career goals.

• Seeking a company that values innovation and encourages professional development.

• Want to work in a more collaborative and diverse team environment.

• Desire to explore new technologies and industries.

• Current company lacks opportunities for advancement or career growth.
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Q1. Firstly discuss with HR about the job role and confirmed of technical round interview schedule then I did receive the date and time
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Q1. In the technical round will meet with the technical person of the data scientist and I gave the interview starting was very good going but I have stuck in some questions then I didn't select in Infosys
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Q1. What are your projects Explain one in brief
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Q1. Pandas basics and SQL joins nlp
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