JPMorgan Chase & Co. Software Development Engineer 3 Interview Questions and Answers

Q1. Can you provide an overview of your background and experiences?
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Quants, DSA, Logical, Analytical, OS, DBMS

Q1. Please introduce yourself
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Q2. Why UBS and what excited you
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Q1. What are joins in sql
Ans. 
Joins in SQL are used to combine rows from two or more tables based on a related column between them.
• 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

• Example: SELECT * FROM table1 INNER JOIN table2 ON table1.column = table2.column
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Q2. What is OOP features
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OOP features are key concepts in Object-Oriented Programming that include encapsulation, inheritance, polymorphism, and abstraction.
• Encapsulation: Bundling data and methods that operate on the data into a single unit (object)

• Inheritance: Ability for a class to inherit properties and behavior from another class

• Polymorphism: Ability for objects to be treated as instances of their parent class or their own class

• Abstractio...read more
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Q3. Primary key , foreign key
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Q4. Exception in java
Ans. 
An exception in Java is a runtime error that disrupts the normal flow of a program.
• Exceptions are objects that are thrown when an error occurs during the execution of a program.

• They can be caught and handled using try-catch blocks.

• Common types of exceptions in Java include NullPointerException, ArrayIndexOutOfBoundsException, and IOException.
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Quant Topics: Interests, Sequence and Series along with Missing items, Time and Distance/Work,
Verbal Topics: Comprehension, Corrections, Grammar etc
CS Core Subjects: DSA, OOPS, DBMS, OS

Overall Test Difficulty was Easy-Medium

System asked to choose one of the programming languages from C, C++ or Java. (Note: You can't change the language once confirmed!)
There were 7 different coding questions along with code. You just need to debug the code to get the correct output.
DSA: Graphs (Basics), Linked Lists, Conditional Statements, and Arrays (Stack and Queue)

Overall Difficulty was Medium (tbh, it depends on the practice you have done!)

Q1. 1. Tell me about yourself 2. What tech stack(s) you have worked on? Why? Why not others? 3. SQL queries based on joins, nesting and aggregations 4. Logical reasoning questions 5. Previous internships exper...read more
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Q1. 1. Tell me about yourself 2. Why you do seek to join this company? 3. Are you comfortable working in shifts? If yes, how will you manage your time? 4. SQL queries 5. Logical question: Total number of squar...read more
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Q1. 1. Tell me about your day. Walk me through it. 2. If given a coding problem, what is your preferred language? Why? 3. Walk me through your best project in your resume. Why/How/When did you make it? 4. Tell...read more
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The coding test comprised 4 questions, held on the Hackerank platform. The time-bound was 90 minutes. I would rate the questions as easy, medium, medium, and hard. You had to solve at least 3 and 80% of the test cases of the last question to qualify for the last round.

Q1. Polymorphism and types of polymorphism.
Ans. 
Polymorphism is the ability of an object to take on many forms. Types include compile-time, runtime, and ad-hoc polymorphism.
• Compile-time polymorphism is achieved through function overloading and templates.

• Runtime polymorphism is achieved through inheritance and virtual functions.

• Ad-hoc polymorphism is achieved through operator overloading and function templates.

• Polymorphism allows for code reusability and flexibility ...read more
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Q2. Relational databases to which I said I had no idea.
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Q3. Binary tree traversal quesiton.
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Q4. Doubly linked list traversal question.
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Q5. Asked about projects.
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Q1. Buy and sell stocks 1
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Q2. Buy and sell stocks 2.
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Q3. An easy puzzle in which the interviewer tries to trick me with my answer. Be confident.
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Q1. String hashing problem, which I solved with KMP using O(n3) solution.
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Q2. Contributions to open source communities.
Ans. 
Contributed to open source communities by developing and maintaining projects.
• Developed and maintained a Python package for data analysis and visualization

• Contributed to a popular JavaScript library by fixing bugs and adding new features

• Participated in open source hackathons and contributed to various projects

• Provided support and guidance to new contributors in the community
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Q3. JEE Mains rank, KVPY rank.
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