KFintech Senior Engineer Interview Questions and Answers

Q1. LLD/Machine coding - Design a social media application with users, posts, comments, likes, etc. There is also an admin who needs to approve post creation and can delete any post they want. Create appropria...read more
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Q1. High-level design - Design a chat-based application like WhatsApp with only user-to-user chat feature (no group chats). Explain and draw out the E2E design by mentioning all the components and design decis...read more
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Q1. Hiring Manager - basic questions like why Razorpay, what are your career goals, what does career growth look like for you, etc.
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Q1. One leetcode easy-medium problem
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Q2. Java, springboot and oops question
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Q1. Project related questions
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Q2. System design questions
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Basic java question opps and For automation selenium tool

Q1. Different between Stringbuffer vs string builder
Ans. 
StringBuffer is synchronized and thread-safe, while StringBuilder is not synchronized.
• StringBuffer is slower due to synchronization, while StringBuilder is faster.

• StringBuffer is preferred in multithreaded environments, while StringBuilder is preferred in single-threaded environments.

• StringBuilder is more efficient for most use cases, but StringBuffer is safer for concurrent access.
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Q1. 3 sum problem and number of operations required to make 2 strings same
Ans. 
3 sum problem involves finding 3 numbers in an array that add up to a target sum. Number of operations to make 2 strings same involves finding the minimum number of operations (insert, delete, replace) needed to transform one string into another.
• For 3 sum problem, use a hashmap to store complements of each number and check if the complement exists in the hashmap while iterating through the array.

• For number of operation...read more
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Q1. Nearby app machine coding
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Q1. Project and practices followed and hld for inshort
Ans. 
I have experience working on projects using high-level design (HLD) practices.
• Utilized UML diagrams to create HLD for projects

• Followed industry best practices for software design

• Collaborated with team members to ensure HLD aligns with project goals
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Data structures, 4 questions

Technology in Banking

Q1. Self intro and questions on project
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Q2. OOps concepts, Inheritance, Polymorphism
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Q3. Different types of Sql queries
Ans. 
Different types of SQL queries include SELECT, INSERT, UPDATE, DELETE, JOIN, and more.
• SELECT: Retrieves data from a database

• INSERT: Adds new records to a table

• UPDATE: Modifies existing records in a table

• DELETE: Removes records from a table

• JOIN: Combines rows from two or more tables based on a related column
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Q1. Explain Concurrency
Ans. 
Concurrency is the ability of a system to execute multiple tasks simultaneously.
• Concurrency allows multiple tasks to run concurrently, improving performance and efficiency.

• Concurrency can be achieved through multithreading or multiprocessing.

• Example: A web server handling multiple requests simultaneously using multithreading.
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Q2. Explain Acid principles
Ans. 
ACID principles are a set of properties that guarantee database transactions are processed reliably.
• Atomicity: Transactions are all or nothing. If one part of the transaction fails, the entire transaction is rolled back.

• Consistency: Transactions bring the database from one valid state to another. All constraints are satisfied.

• Isolation: Transactions are isolated from each other until they are completed.

• Durability: Once...read more
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Q1. They asked about previous projects in depth
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Q1. They asked techinal all java
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Q1. Techincal kafka all questions
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