Wells Fargo Software Engineering Manager Interview Questions and Answers

Q1. What system design strategies can be employed to optimize databases for handling a higher volume of read operations compared to write operations?
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Q2. How would you design a data processing system to manage incoming data from various sources, such as files and databases?
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It was just a typical logical reasoning and aptitude MCQ test

There were 2 coding questions and you can select any language for solving it. The test was online

Q1. He simply asked me which coding language I prefer and why ? (Mine was C++)
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Q2. Difference between C and C++?
Ans. 
C is a procedural programming language while C++ is an object-oriented programming language.
• C is a procedural programming language, while C++ supports both procedural and object-oriented programming.

• C does not have classes and objects, while C++ does.

• C does not support function overloading, while C++ does.

• C does not have exception handling, while C++ does.

• C does not have namespaces, while C++ does.
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Q3. What is Object oriented programming?
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Object oriented programming is a programming paradigm based on the concept of objects, which can contain data and code.
• Objects are instances of classes, which define the structure and behavior of the objects.

• Encapsulation, inheritance, and polymorphism are key principles of object oriented programming.

• Example: Inheritance allows a class to inherit properties and methods from another class.

• Example: Encapsulation hides t...read more
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Q4. What are the 4 pillars of OOPs?
Ans. 
Encapsulation, Inheritance, Polymorphism, Abstraction
• Encapsulation: Bundling data and methods that operate on the data into a single unit

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

• Polymorphism: Ability to present the same interface for different data types

• Abstraction: Hiding the complex implementation details and showing only the necessary features
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Q5. Write down code implementing all 4 pillars of OOPs.
Ans. 
Code implementing all 4 pillars of OOPs
• Encapsulation: Encapsulate data within classes and provide public methods to access and modify the data.

• Inheritance: Create a hierarchy of classes where child classes inherit attributes and methods from parent classes.

• Polymorphism: Allow objects of different classes to be treated as objects of a common superclass through method overriding and overloading.

• Abstraction: Hide complex ...read more
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Q6. Difference between Stacks and Queues?
Ans. 
Stacks are Last In First Out (LIFO) data structures, while Queues are First In First Out (FIFO) data structures.
• Stacks: Elements are added and removed from the same end, like a stack of plates. Example: Undo feature in text editors.

• Queues: Elements are added at the rear and removed from the front, like a line of people waiting. Example: Print queue in a printer.
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Q7. Write a code to find the 2nd largest element in an array.
Ans. 
Code to find the 2nd largest element in an array
• Sort the array in descending order and return the element at index 1

• Iterate through the array and keep track of the two largest elements

• Handle edge cases like arrays with less than 2 elements
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Q8. What is merge sort and its Algorithm ?
Ans. 
Merge sort is a divide and conquer algorithm that divides the input array into two halves, sorts them recursively, and then merges them.
• Divide the input array into two halves

• Recursively sort each half

• Merge the sorted halves back together
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Q9. What is DBMS and RDBMS and difference between them?
Ans. 
DBMS stands for Database Management System, while RDBMS stands for Relational Database Management System. RDBMS is a type of DBMS.
• DBMS is a software system that allows users to define, create, maintain and control access to the database.

• RDBMS is a type of DBMS that stores data in a structured format using tables with rows and columns.

• RDBMS enforces a set of rules called ACID properties to ensure data integrity, while D...read more
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Q10. What is SQL and who its different from mySQL?
Ans. 
SQL is a standard language for managing databases, while MySQL is a specific open-source relational database management system.
• SQL stands for Structured Query Language and is used to communicate with databases.

• SQL is a standard language that can be used with various database management systems.

• MySQL is a specific open-source relational database management system that uses SQL.

• MySQL is one of the most popular database m...read more
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Q11. Difference between Delete, Truncate and Drop?
Ans. 
Delete removes specific rows from a table, Truncate removes all rows from a table, and Drop removes the table itself.
• Delete is a DML command that removes specific rows from a table based on a condition.

• Truncate is a DDL command that removes all rows from a table but keeps the table structure.

• Drop is a DDL command that removes the entire table along with its structure.
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Q12. Different kind of Joins in DBMS ?
Ans. 
Different types of joins in DBMS include inner join, outer join, left join, right join, and full join.
• Inner join: Returns rows when there is a match in both tables.

• Outer join: Returns all rows from one table and only matching rows from the other table.

• Left join: Returns all rows from the left table and the matched rows from the right table.

• Right join: Returns all rows from the right table and the matched rows from the ...read more
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Q13. And at last 2 to 3 SQL queries. They were not that hard, Just basic queries.
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