CapitalOne Senior Software Engineer Interview Questions and Answers

Q1. Lots of technical questions but the interview was not technical..
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Q2. What is JIT compiler
Ans. 
JIT compiler stands for Just-In-Time compiler, which compiles code during runtime instead of ahead of time.
• JIT compiler improves performance by compiling code on the fly as it is needed

• It converts bytecode into native machine code for execution

• Examples include Java HotSpot JIT compiler and .NET JIT compiler
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Q3. What are futures
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Futures are financial contracts that obligate the buyer to purchase an asset or the seller to sell an asset at a predetermined future date and price.
• Futures are standardized contracts traded on exchanges, where the buyer agrees to purchase an asset at a future date for a price agreed upon today.

• They are commonly used in commodities, currencies, and financial instruments trading.

• Futures allow investors to hedge against ...read more
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Q4. What is GC and what types we have
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GC stands for Garbage Collection, a process in programming languages where unused memory is automatically reclaimed.
• Types of GC include: Mark and Sweep, Reference Counting, Generational, and Incremental.

• Mark and Sweep: Identifies and removes unreachable objects.

• Reference Counting: Keeps track of the number of references to an object and deletes it when the count reaches zero.

• Generational: Divides objects into different...read more
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Q5. Walk me through a trading process
Ans. 
A trading process involves buying and selling financial instruments in the market.
• Research and analysis of market trends and opportunities

• Placing buy or sell orders through a trading platform

• Monitoring and managing open positions

• Executing trades based on predetermined strategies

• Recording and analyzing trade data for performance evaluation
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Q1. All are about our primary skills and project in 1st round of technical
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Q1. C# OOPS Concepts, SQL query questions. It was very basic and easy questions.
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Q1. Very detailed questions about design patterns, security and architect level questions. This depends on experience level.
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Q1. Very interactive questions. Based on experience they will ask about team management, Agile methodology.
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3 coding questions on hacekrank platform

Q1. Internal working of hashmap
Ans. 
HashMap is a data structure that stores key-value pairs and uses hashing to efficiently retrieve values.
• HashMap internally uses an array of linked lists to store key-value pairs.

• When a key-value pair is added, the key is hashed to determine the index in the array where it will be stored.

• If multiple keys hash to the same index, a linked list is used to handle collisions.

• HashMap uses the hashCode() method of keys to calc...read more
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Q2. Springbbot, Microservices questions
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Q1. Project related
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Q2. System design questions
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Q1. General HR Discussion
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Q2. Why you want join the company
Ans. 
I want to join the company because of its innovative projects and strong reputation in the industry.
• Impressed by the company's track record of successful projects

• Excited about the opportunity to work on cutting-edge technologies

• Looking forward to collaborating with talented team members
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