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Walmart Labs Data Engineer 3 Interview Questions and Answers
Walmart Labs Data Engineer 3 Interview Experiences
1 interview found
Anonymous
Selected
I applied via Referral and was interviewed before Apr 2023. There were 3 interview rounds.
(2 Questions)
- Q1. Recursive CTE related SQL
- Q2. Python program to parse JSON
- Ans.
Python program to parse JSON
Use the json module in Python to parse JSON data
Use the loads() method to load JSON data into a Python dictionary
Access the data in the dictionary using keys
(2 Questions)
- Q1. Advanced SQL on JOINs and Windowing
- Q2. Spark Optimization on JOIN queries
- Ans.
Optimizing JOIN queries in Spark involves partitioning data, using broadcast joins, and optimizing shuffle operations.
Partition data to avoid shuffling unnecessary data across the network
Use broadcast joins for small tables that can fit in memory of each executor
Optimize shuffle operations by tuning shuffle partitions and memory settings
No case study was asked. HM asked about my experience and project details.
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Interview Questionnaire
1 Question
- Q1. A-Z in MySQL, programming languages(only concepts)
I applied via Campus Placement and was interviewed before Mar 2020. There was 1 interview round.
Interview Questionnaire
2 Questions
- Q1. Basics about .Net and SQl server
- Q2. What are triggers
- Ans.
Triggers are database objects that automatically execute in response to certain events or changes in data.
Triggers are used to enforce business rules or data integrity.
They can be used to audit changes to data.
Triggers can be set to execute before or after an event, such as an insert, update, or delete operation.
They can be defined on tables, views, or schemas.
Examples of triggers include sending an email notification ...
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Skills evaluated in this interview
Interview Questionnaire
1 Question
- Q1. Tell me something about your self?
Interview Preparation Tips
I applied via Naukri.com and was interviewed in Sep 2020. There were 3 interview rounds.
Interview Questionnaire
1 Question
- Q1. Technical questions on Microsoft .net/core Azure.
Interview Preparation Tips
Some formality question may ask like tell me about yourself? what were you are doing so far?are you comfortable for something like in night shifts? etc to check your communication. I advise be honest with yourself on this questions so that you may avoid searching next job after immediately joining the next organisation. I also request don't say yes for sake of yes for the offer and based on that you search the next organisation during your notice period and finally you may drop all the less offered salaries organisations, believe me the offer which you have rejected that may help to the needy person and also maintain the trust in the IT industry if you are honest with yourself.
thanks and best of luck.
I applied via Campus Placement and was interviewed in Jul 2021. There was 1 interview round.
Interview Questionnaire
1 Question
- Q1. Another Skills Prepare for this job?
Interview Preparation Tips
I applied via Naukri.com and was interviewed before Jan 2021. There were 3 interview rounds.
Interview Questionnaire
1 Question
- Q1. Java Basic questions and Git
Interview Preparation Tips
I applied via Naukri.com and was interviewed in Aug 2020. There was 1 interview round.
Interview Questionnaire
2 Questions
- Q1. Interfaces
- Q2. Oop concepts
Interview Preparation Tips
I applied via Walk-in and was interviewed in Aug 2020. There were 4 interview rounds.
Interview Questionnaire
1 Question
- Q1. They ask only basics of programming languages which are mentioned in resume
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Interview Questionnaire
3 Questions
- Q1. Technical
- Q2. Basis
- Q3. Mcq
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Walmart Labs Data Engineer 3 Interview Process
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