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Kellton Interview Questions and Answers
47 Interview questions
setState is a method used in stateful widgets to update the state of the widget and trigger a rebuild of the UI.
setState is called with a callback function that updates the state variables.
The callback function is executed asynchronously.
The new state values are merged with the old state values.
The widget is rebuilt with the updated state values.
SQL joins are used to combine rows from two or more tables based on a related column between them.
SQL joins are used to retrieve data from multiple tables based on a related column.
Common types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN.
CTE (Common Table Expression) is a temporary result set that can be referenced within a SELECT, INSERT, UPDATE, or DELETE statement.
Stored Procedures (SP) ar...
Tuple is an ordered collection of elements. Closures are self-contained blocks of code. Delegates are references to functions. Notifications are a way to send messages between objects.
Tuple: Used to group multiple values together. Example: (1, 'apple', True)
Closures: Encapsulate code and capture variables. Example: { (x: Int) -> Int in return x * 2 }
Delegates: Allow one object to communicate with another. Example:...
Micro-frontend is an architectural style where a frontend application is broken down into smaller, independent 'micro-applications'.
Each micro-frontend is responsible for a specific feature or functionality
Micro-frontends can be developed, tested, and deployed independently
They can communicate with each other through APIs or events
Common frameworks for implementing micro-frontends include single-spa, Webpack Modul...
Reverse the String Problem Statement
You are given a string STR which contains alphabets, numbers, and special characters. Your task is to reverse the string.
Example:
Input:
STR = "abcde"
Output:
"ed...
Reverse a given string containing alphabets, numbers, and special characters.
Iterate through the string from the end to the beginning and append each character to a new string.
Use built-in functions like reverse() or StringBuilder in languages like Python or Java for efficient reversal.
Handle special characters and numbers along with alphabets while reversing the string.
Ensure to consider the constraints provided ...
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:
...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 maximum sum subarray seen so far
Use Kadane's algorithm to efficiently find the maximum subarray sum
Consider the case where all elements are negative to handle edge cases
Count Subsequences Problem Statement
Given an integer array ARR of size N, your task is to find the total number of subsequences in which all elements are equal.
Explanation:
A subsequence of an array is...
Count the total number of subsequences in which all elements are equal in an integer array.
Iterate through the array and count the frequency of each element.
Calculate the total number of subsequences for each element using the formula (frequency * (frequency + 1) / 2).
Sum up the total number of subsequences for all elements and return the result modulo 10^9 + 7.
Distinct Subsequences Problem Statement
You are given a string 'S' of length 'N' which may include duplicate alphabets. Your goal is to calculate the number of distinct subsequences in the string.
Example...
Calculate the number of distinct subsequences in a string with possible duplicates.
Iterate through the string and keep track of the count of each character.
Use dynamic programming to calculate the number of distinct subsequences.
Consider the cases where a character is included or excluded in the subsequence.
Modulo the final count by 10^9 + 7 to handle large answers.
Minimum Sum in Matrix Problem Statement
You are given a 2D matrix 'ARR' of size 'N x 3' with integers, where 'N' is the number of rows. Your task is to compute the smallest sum achievable by selecting one ...
Find the smallest sum achievable by selecting one element from each row of a 2D matrix, following certain constraints.
Iterate through each row and calculate the minimum sum by selecting elements that do not violate the constraints.
Keep track of the minimum sum achieved so far.
Avoid selecting elements directly below previously selected elements.
Example: For input ARR = [[1, 2, 3], [4, 8, 6], [1, 5, 3]], the optimal...
Number Pattern Generation
Ninja enjoys arranging numbers and wishes to organize them into N rows. The first row should have 1 number, the second row 2 numbers, the third row 3 numbers, and so forth, contin...
Generate number pattern in N rows with ascending order and restarting at 9.
Iterate through each row from 1 to N.
In each row, print numbers in ascending order starting from 1 and restarting at 9.
Handle the wrapping around from 9 to 1 when reaching 9 in the sequence.
Kellton Interview Experiences
52 interviews found
vajrala varsha1016
Selected
I applied via Referral and was interviewed in Jul 2024. There was 1 interview round.
(4 Questions)
- Q1. Python coding (basic)
- Q2. Python coding basics on java
- Q3. Tell about your self
- Ans.
I am a recent graduate with a degree in Computer Science and a passion for coding and problem-solving.
Graduated with a degree in Computer Science
Skilled in coding and problem-solving
Passionate about technology and innovation
- Q4. About my google apprenticeship
SAI GANESH ARISETTY
I applied via Referral and was interviewed in Apr 2024. There was 1 interview round.
(3 Questions)
- Q1. Say about the job description that what you understood
- Q2. Why do you want to join as a consultant as you have good coding knowledge
- Q3. Why do you want to become a consultant.. though you have good coding knowledge
Interview Preparation Tips
- Job description
patel dinesh
(2 Questions)
- Q1. Prcedure function join view
- Q2. Bulk collect plsql table trigger
- Ans.
Bulk collect in PL/SQL enhances performance by reducing context switches between SQL and PL/SQL engines.
Bulk collect allows fetching multiple rows in a single context switch.
Example: Using BULK COLLECT with SELECT INTO to load data into a PL/SQL collection.
Can be used with FORALL to perform bulk DML operations efficiently.
Example: FORALL i IN 1..my_array.COUNT INSERT INTO my_table VALUES my_array(i);
Triggers can utiliz...
Interview Preparation Tips
Anonymous
I applied via Naukri.com and was interviewed in Nov 2024. There was 1 interview round.
Experienced based scenarios.
I applied via Naukri.com and was interviewed in Feb 2024. There was 1 interview round.
(3 Questions)
- Q1. What is Sql joins, cte, Sp vs function, user defined types,
- Ans.
SQL joins are used to combine rows from two or more tables based on a related column between them.
SQL joins are used to retrieve data from multiple tables based on a related column.
Common types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN.
CTE (Common Table Expression) is a temporary result set that can be referenced within a SELECT, INSERT, UPDATE, or DELETE statement.
Stored Procedures (SP) are pre...
- Q2. C# interfces, opps concepts, DI, asp page life cycle
- Q3. Ado. Net & entity frework difference
- Ans.
ADO.NET is a data access technology while Entity Framework is an ORM framework for data access in .NET applications.
ADO.NET is a set of classes used to interact with data sources like databases directly.
Entity Framework is an ORM framework that allows developers to work with data in terms of objects and classes.
ADO.NET requires writing SQL queries manually, while Entity Framework allows querying data using LINQ.
Entity ...
Interview Preparation Tips
- OOPS
- C#
- SQL
Skills evaluated in this interview
I applied via Recruitment Consulltant and was interviewed in Dec 2023. There were 3 interview rounds.
(11 Questions)
- Q1. How to manage memory management in Python?
- Ans.
Memory management in Python involves automatic memory allocation and deallocation through garbage collection.
Python uses automatic memory management through garbage collection, so manual memory management is not required.
Use tools like memory_profiler to identify memory leaks and optimize memory usage.
Avoid creating unnecessary objects and use data structures efficiently to minimize memory usage.
- Q2. Difference between Async , Sync and multithread?
- Ans.
Async is non-blocking, Sync is blocking, Multithread allows multiple threads to run concurrently.
Async allows the program to continue executing other tasks while waiting for a response, commonly used in web development with AJAX calls.
Sync blocks the program until a task is completed, commonly used in simple sequential programs.
Multithreading allows multiple threads to run concurrently, improving performance by utilizi...
- Q3. CI/CD pipeline deployment?
- Ans.
CI/CD pipeline automates software deployment, ensuring faster delivery and higher quality through continuous integration and continuous delivery.
CI/CD stands for Continuous Integration and Continuous Deployment.
Continuous Integration involves automatically testing and merging code changes into a shared repository.
Continuous Deployment automates the release of code changes to production after passing tests.
Tools like Je...
- Q4. How to revert last commit?
- Ans.
Use 'git revert' command to revert the last commit.
Use 'git log' to find the commit hash of the last commit
Run 'git revert
' to revert the last commit Commit the revert changes with a new commit message
- Q5. Difference between select_related vs prefetch_related with example?
- Ans.
select_related follows foreign key relationships and retrieves related objects in a single query, while prefetch_related retrieves related objects separately to avoid performance issues.
select_related is used for accessing related objects in a single query, reducing database hits
prefetch_related is used for accessing related objects separately to avoid performance issues
select_related is more efficient for one-to-one o...
- Q6. What is decorater write example?
- Ans.
Decorator is a design pattern in software development that allows behavior to be added to individual objects, either statically or dynamically.
Decorators are used to modify the behavior of functions or classes without changing their source code.
In Python, decorators are implemented using the @ symbol followed by the decorator function name.
Example: @decorator_function def some_function(): # function implementation
...
- Q7. How to optimise query?
- Ans.
Optimizing query involves indexing, minimizing data retrieval, using proper joins, and avoiding unnecessary functions.
Use indexes on columns frequently used in WHERE clauses
Minimize data retrieval by selecting only necessary columns
Use proper joins (INNER JOIN, LEFT JOIN, etc.) instead of subqueries
Avoid unnecessary functions in WHERE clauses
- Q8. What is normalisation?
- Ans.
Normalization is the process of organizing data in a database to reduce redundancy and improve data integrity.
Normalization is used to eliminate redundant data and ensure data dependencies are logical.
It involves dividing a database into two or more tables and defining relationships between them.
Normalization helps in reducing data redundancy, improving data integrity, and making data maintenance easier.
There are diffe...
- Q9. How to increase performance?
- Ans.
To increase performance, optimize code, use efficient algorithms, parallel processing, caching, and database indexing.
Optimize code by reducing unnecessary loops and improving data structures
Use efficient algorithms like binary search instead of linear search
Implement parallel processing to utilize multiple CPU cores
Utilize caching to store frequently accessed data for faster retrieval
Implement database indexing to spe...
- Q10. How to secure your API’s?
- Ans.
Securing APIs involves using authentication, authorization, encryption, and monitoring.
Implement authentication mechanisms such as OAuth, JWT, or API keys to verify the identity of clients accessing the API.
Use authorization to control access to different parts of the API based on roles and permissions.
Encrypt data transmitted between clients and the API using HTTPS to prevent eavesdropping.
Implement rate limiting and ...
- Q11. How single design patterns work?
- Ans.
Single design patterns work by providing a reusable solution to common problems in software development.
Design patterns help in organizing code and making it more maintainable.
They promote code reusability and flexibility.
Examples of single design patterns include Singleton, Factory, and Observer.
(1 Question)
- Q1. Questions from your resume.
(1 Question)
- Q1. Salary discussion and your tenure employments.
Skills evaluated in this interview
Selected
I applied via Naukri.com and was interviewed in Mar 2024. There was 1 interview round.
(2 Questions)
- Q1. D/f b/w regression and retesting?
- Ans.
Regression testing is done to ensure that new code changes have not adversely affected existing functionality, while retesting is done to verify that a specific bug has been fixed.
Regression testing is performed after code changes to ensure that existing functionality still works as expected.
Retesting is performed to verify that a specific bug has been fixed.
Regression testing is broader in scope and covers multiple fu...
- Q2. D/f b/w Put and Patch method in API?
- Ans.
Put method is used to create or update a resource, while Patch method is used to update a resource partially.
Put method is idempotent, meaning multiple identical requests will have the same effect as a single request.
Patch method is not necessarily idempotent, as multiple identical requests may have different effects.
Put method requires the client to send the entire resource representation in the request body.
Patch met...
Skills evaluated in this interview
(1 Question)
- Q1. Can you provide details about your previous projects?
- Ans.
I have worked on various projects including developing a new software system for a manufacturing company and implementing a data analytics platform for a financial institution.
Developed a new software system for a manufacturing company to streamline production processes
Implemented a data analytics platform for a financial institution to improve decision-making
Led a team in designing and deploying a cloud-based solution...
Interview Preparation Tips
They treat you like animals.
I applied via Naukri.com and was interviewed in Nov 2023. There were 3 interview rounds.
Aptitude test was easy and I was passed in one attempt
(4 Questions)
- Q1. Technical questions regarding the project done
- Q2. Regarding agile and scrumprocess
- Q3. Regarding rsume
- Q4. Hr discussion ha done
Interview Preparation Tips
(2 Questions)
- Q1. Related to Your Work ex
- Q2. Related to your profile
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