Lumiq Interview Questions, Process, and Tips

Q1. Explain deeply about the projects in my resume.
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Q2. I gave complete information of all the tech stacks that I have previously worked on and explained the projects in detail.
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Q1. Introduction and General Background
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Q2. My experience in last internship
Ans. 
I gained valuable experience in my last internship by working on various projects and collaborating with team members.
• Developed strong communication and teamwork skills

• Learned how to prioritize tasks and manage time effectively

• Improved my problem-solving abilities through real-world challenges
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Have thorough understanding of spark internals

Again Spark and azure understanding is required

Q1. Normal HR questions
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Q2. Salary negotiation
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Logical questions, verbal, vocabulary, coding , dsa , java fundamentals

Q1. Basic questions on data enginner , analyst,cloud and all .
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Q1. What is Brypt lib. I’ve used it in the project
Ans. 
Bcrypt lib is a library used for hashing passwords securely in software projects.
• Bcrypt lib is commonly used in software projects to securely hash passwords before storing them in a database.

• It helps protect user passwords from being easily compromised in case of a data breach.

• Bcrypt uses a salt to add randomness to the hashing process, making it more difficult for attackers to crack passwords.

• Example: bcrypt.hashSync(...read more
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Q2. What is JWT.
Ans. 
JWT stands for JSON Web Token, a compact and self-contained way for securely transmitting information between parties as a JSON object.
• JWT is commonly used for authentication and information exchange in web development.

• It consists of three parts: header, payload, and signature.

• Example: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMe
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Q1. How to optimize spark jobs ?
Ans. 
Optimizing Spark jobs involves tuning various parameters such as memory allocation, partitioning, and caching.
• Increase memory allocation for executors and driver

• Partition data appropriately to avoid skewness

• Cache frequently accessed data to avoid recomputation

• Use broadcast variables for small data sets

• Avoid shuffling data unnecessarily

• Use appropriate serialization format

• Use appropriate hardware for cluster

• Monitor and o
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Q2. What is coalesce and repartition ?
Ans. 
Coalesce is used to select the first non-null value from a set of columns. Repartition is used to shuffle data across nodes.
• Coalesce is a function that returns the first non-null value from a set of columns.

• Repartition is used to shuffle data across nodes to increase parallelism.

• Coalesce reduces the number of columns in a DataFrame.

• Repartition increases or decreases the number of partitions in a DataFrame.

• Coalesce is u...read more
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Round duration - 60 minutes
Round difficulty - Medium

This round was conducted in the evening, it was a 1 hour round.

Q1. What are deadlocks in operating systems, and how can they be resolved?
Ans. 
Deadlocks in operating systems occur when two or more processes are unable to proceed because each is waiting for the other to release a resource.
• Deadlocks happen when processes hold resources and wait for others, creating a circular wait.

• Four conditions must hold for a deadlock to occur: mutual exclusion, hold and wait, no preemption, and circular wait.

• Deadlocks can be resolved using methods like prevention, avoidance...read more
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Round duration - 30 minutes
Round difficulty - Medium

Topics asked where OOPs, DBMS, DSA, SQL.
It was conducted on Microsoft Teams.

Q1. 
Covid Vaccination Distribution Problem
As the Government ramps up vaccination drives to combat the second wave of Covid-19, you are tasked with helping plan an effective vaccination schedule. Your goal is...read more
Ans. 
Maximize the number of vaccines administered on a specific day while adhering to certain rules.
• Given n days, maxVaccines available, and a specific dayNumber, distribute vaccines to maximize on dayNumber

• Administer positive number of vaccines each day with a difference of 1 between consecutive days

• Ensure sum of vaccines distributed does not exceed maxVaccines

• Output the maximum number of vaccines administered on dayNumber
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Q2. 
Maximum Subarray Sum Problem Statement
Given an array arr of length N consisting of integers, find the sum of the subarray (including empty subarray) with the maximum sum among all subarrays.
Explanation...read more
Ans. 
Find the sum of the subarray with the maximum sum among all subarrays in an array of integers.
• Iterate through the array and keep track of the current sum and maximum sum.

• If the current sum becomes negative, reset it to 0.

• Return the maximum sum found.
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Round duration - 20 minutes
Round difficulty - Easy

It was 20 minutes round on Microsoft Teams. First, an 8 minutes psychometric round was conducted. According to the psychometric report, situations were discussed.