Visa Senior Data Engineer Interview Questions and Answers

Given Python coding challenge related to string processing and second question was matrix processing using python

Q1. Bagging boosting and its difference and uses.
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Q2. Methods to minimize overfitting and underfitting
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Q3. Transformer architecture
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Q4. LLM usecase and explain how to work on it
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Q1. Given data, find out what AI project can be discovered and how to progress on implementing it.
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Q2. Given data and usecase, which model to use to implement solution and how detailed steps.
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Q1. Discussed each project in my resume in detail and related questions
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Q2. Discussed team and personal behavioural questions
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Q1. Deep dive into java concepts. Max diameter of a tree in java.
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Q1. Lld of loan and borrower design. Design dbs schema. About connection pool, db isolation.
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Q1. Hiring manager round, more about previous experience and some hypothetical questions.
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Java coding questions, basic Java questions.

Q1. Java basics questions.
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Q2. Live coding.
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Q1. Discussion on previous experience and projects.
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Q2. System design question
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Q1. Questions on SQL, Java advanced, personal projects, Java frameworks, UI based questions, Agile methodologies.
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Q2. Interview discussion with the whole team.
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Q1. Benefits discussion.
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Q2. Salary discussion.
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Sql, python, statistical questions

Q1. How daily work looks like?
Ans. 
Daily work involves analyzing data, creating reports, and communicating findings to stakeholders.
• Reviewing and cleaning data sets

• Creating visualizations and dashboards

• Conducting statistical analysis

• Communicating insights to non-technical stakeholders
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Q2. Most ise tools?
Ans. 
Some of the most commonly used tools for data analysis include Excel, Python, R, Tableau, and SQL.
• Excel is widely used for data manipulation and analysis.

• Python and R are popular programming languages for data analysis and machine learning.

• Tableau is a powerful data visualization tool.

• SQL is essential for querying databases and extracting data.
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4 sql tasks on 3 tables. Joins, subqueries

Q1. Use cases based on real life scenarios, such as come up with solution on maid website
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Q1. Why use FastAPI
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Q1. Basic questions about resume
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Q1. Workplace adjustment questions
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Q2. Are you willing to work extra hours
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