ZIGRAM Data Specialist Interview Questions and Answers

Q1. About work experience
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Q2. About education
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Q1. Machine Learning-related stuff: Confusion Matrix, R2 score, etc.. Also, Python & Statistics.
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Q2. Explain any one project.
Ans. 
Developed a predictive model to forecast customer churn for a telecom company.
• Collected and cleaned customer data including usage patterns and demographics.

• Used machine learning algorithms such as logistic regression and random forest to build the model.

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

• Provided actionable insights to the company based on the model's predictions.
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Q3. Difference between Data Analyst and Data Scientist.
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Data Analyst focuses on analyzing data to provide insights, while Data Scientist focuses on using advanced algorithms and machine learning to predict future trends.
• Data Analyst focuses on analyzing data to provide insights for decision-making.

• Data Scientist focuses on using advanced algorithms and machine learning to predict future trends.

• Data Analyst typically works with structured data, while Data Scientist works wit...read more
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It was deciphering spoken language to subtitle for a complicated accented show

Q1. Why do you want to work here?
Ans. 
I am passionate about the company's mission and values, and I believe my skills and experience align well with the opportunities here.
• Passionate about company's mission and values

• Skills and experience align well with opportunities

• Excited about potential for growth and development
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Q2. What are you passionate about that made you apply for this job?
Ans. 
I am passionate about using data analysis to drive business decisions and improve processes.
• I have always been fascinated by the power of data to uncover insights and drive strategic decision-making.

• I enjoy working with large datasets and using statistical tools to extract meaningful information.

• I believe that data-driven decision-making is crucial for businesses to stay competitive in today's market.

• For example, in my...read more
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Q1. Basics .net , c#, sql
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Q1. Current Project Details, Roles and some technical questions too
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Q1. Package Discussion and Other basic details
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Q1. Describe Life cycle in react
Ans. 
React has three main phases in its lifecycle: mounting, updating, and unmounting.
• Mounting: when a component is created and inserted into the DOM

• Updating: when a component is updated due to changes in props or state

• Unmounting: when a component is removed from the DOM

• Lifecycle methods can be used to perform actions at each phase, such as componentDidMount() or componentWillUnmount()

• React also has error handling methods,
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Q2. Explain strict mode in javascript and it's use
Ans. 
Strict mode is a way to write secure and optimized JavaScript code.
• Enables catching of silent errors

• Disallows duplicate property names or parameters

• Prevents use of undeclared variables

• Makes `eval()` safer to use

• Throws errors on invalid usage of `this` keyword
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CURD operations along with implementation of a mock UI

Q1. Tell about Oops concepts
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OOPs concepts are fundamental principles in object-oriented programming, including inheritance, encapsulation, polymorphism, and abstraction.
• Inheritance: Allows a class to inherit properties and behavior from another class.

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Polymorphism: Ability to present the same interface for different data types.

• Abstraction: Hiding the complex imple...read more
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Q1. Will ask coding related
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Q1. What is Expected salary
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Q1. String palindrome
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Q2. Find all anagrams in a string
Ans. 
Find all anagrams in a string
• Create a hashmap to store the frequency of characters in the input string

• Iterate through the input string and check if the frequency of characters matches the hashmap for each substring of the same length

• Store the substrings that are anagrams in an array and return it
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Create an API using Notepad to check if a string is a palindrome or not.

Q1. Solid principal
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