Walmart Senior Data Engineer Interview Questions and Answers

Q1. SQL self join related question
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Q2. Working of spark in detail
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Spark is a distributed computing framework that processes big data in memory and is known for its speed and ease of use.
• Spark is an open-source, distributed computing system that provides an interface for programming entire clusters with implicit data parallelism and fault tolerance.

• It can run programs up to 100x faster than Hadoop MapReduce in memory, or 10x faster on disk.

• Spark provides high-level APIs in Java, Scala...read more
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Q1. DAG implementation in detail
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DAG implementation involves defining tasks and their dependencies in a directed acyclic graph.
• DAG is a graph where nodes represent tasks and edges represent dependencies between tasks.

• Tasks can only be executed once all their dependencies have been completed.

• Common tools for DAG implementation include Apache Airflow and Luigi.

• Example: Task A must be completed before Task B can start, forming a dependency between them.
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Q2. Explain salting in detail
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Salting is a technique used in cryptography to add random data to passwords before hashing to prevent rainbow table attacks.
• Salting involves adding a random string of characters to a password before hashing it

• The salt value is unique for each password and is stored alongside the hashed password

• Salting prevents attackers from easily cracking passwords using precomputed rainbow tables

• Example: If a password is 'password12...read more
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Code question on tree dp and metrics dp

Data structures and algorithms

Q1. Low level design and system design
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Q1. About project and deal with particular problem
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Q1. Questions on algorithm, coding hands on
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Q2. Core technical questions, scenario based
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Q3. Conceptual questions
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Q1. Coding hands on check
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Q2. Scenario based technical questions
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Q3. Architecture based questions
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Q1. Project related questions
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Q2. Case studies based questions
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Q3. Core technical questions based on resume
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Q1. What are your salary expectations?
Ans. 
I would expect a competitive salary based on my experience and the responsibilities of the role.
• Research the average salary range for Senior Data Engineers in your location and industry.

• Consider your years of experience, technical skills, and any additional certifications or qualifications.

• Be prepared to negotiate and discuss benefits and perks as part of the overall compensation package.
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Q2. What is your family background?
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My family background is diverse and multicultural, with members from different countries and professions.
• My parents are from different countries, which has exposed me to different cultures and perspectives.

• My father is a doctor and my mother is an engineer, which has influenced my interest in both fields.

• I have relatives who are teachers, artists, and entrepreneurs, which has given me a well-rounded understanding of di...read more
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Q3. Why are you looking for a change?
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Seeking new challenges and growth opportunities in a dynamic and innovative environment.
• Looking for a change to expand my skill set and knowledge.

• Seeking new challenges and opportunities for professional growth.

• Interested in working in a dynamic and innovative environment.

• Want to contribute to a company that aligns with my values and goals.

• Desire to work with cutting-edge technologies and tools.

• Looking for a better wor...read more
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Q4. Where do you see yourself in 5 years?
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In 5 years, I see myself leading a team of data engineers, driving innovative solutions and contributing to the company's growth.
• Leading a team of data engineers

• Driving innovative solutions

• Contributing to the company's growth
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Q5. What are your strengths and weaknesses?
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My strengths include strong technical skills, problem-solving abilities, and attention to detail. My weaknesses include a tendency to overthink and a desire for perfection.
• Strong technical skills in data engineering

• Ability to solve complex problems

• Attention to detail in data analysis and processing

• Tendency to overthink and analyze situations excessively

• Desire for perfection which can sometimes lead to delays
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Q6. Tell me about yourself.
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I am an experienced Senior Data Engineer with a strong background in data management and analytics.
• Over 8 years of experience in designing and implementing data pipelines

• Proficient in programming languages like Python, SQL, and Java

• Expertise in big data technologies such as Hadoop, Spark, and Kafka

• Skilled in data modeling, ETL processes, and data warehousing

• Strong problem-solving and communication skills

• Worked on proje...read more
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