Salesforce Senior Software Engineer Interview Questions and Answers

Q1. Problem solving question
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Q2. Java , stream , Spring fundamentals
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Q1. Some basic String array problem solving question
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Q2. Java questions like junit , Spring boot
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Q1. String questions , DSA problem
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Q2. Java questions in brief
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Q1. Difference between abstract class and interface?
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Q2. Explain OOP in C#?
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A code to identify errors and write Junit. Optimise the code as well.

Q1. Stacks using queue
Ans. 
Implementing a stack using two queues
• Use two queues to simulate a stack

• Push operation: Enqueue the element to queue 1

• Pop operation: Dequeue all elements from queue 1 to queue 2, dequeue the last element from queue 1, then swap the queues

• Top operation: Return the front element of queue 1

• Example: Push 1, 2, 3 - Queue 1: [1, 2, 3], Queue 2: []

• Example: Pop - Queue 1: [1, 2], Queue 2: [3]
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Q2. BFS and Knapsack problem, previous project experience
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Q1. 2 DSA questions
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Q1. Half an hour of behavioral questions and 1 DSA question
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Q1. One hour discussion of the work that I have done till now
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Q1. 1 Hard DSA question
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Q1. 1 Hard DSA question
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Q1. Design round for HLD
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Q1. Difference between structure and class
Ans. 
Structure is a user-defined data type that groups related data members, while class is a blueprint for creating objects with data members and member functions.
• Structure is a value type, while class is a reference type

• Structure members are public by default, while class members are private by default

• Structure does not support inheritance, while class supports inheritance

• Example: struct Person { string name; int age; };
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Q2. What is Pass by Value & pass by Reference
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Pass by value involves passing a copy of the actual value, while pass by reference involves passing a reference to the actual value.
• Pass by value: actual value is copied and changes made to the copy do not affect the original value

• Pass by reference: reference to the actual value is passed, changes made to the reference affect the original value

• Example: Pass by value - int x = 10; func(x); // x remains 10 after func cal...read more
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Q3. Print ****** *** *
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Coding test with 2 questions

Q1. System Design with LLD implementation
Ans. 
System design involves creating a high-level design of a software system, followed by implementing the detailed low-level design.
• Start by understanding the requirements and constraints of the system

• Create a high-level design that outlines the components and interactions of the system

• Implement the detailed low-level design, considering factors like scalability, performance, and maintainability

• Use tools like UML diagrams...read more
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Q1. System Design with HLD
Ans. 
System Design with HLD involves designing the high-level architecture of a software system.
• Understand the requirements and constraints of the system

• Identify the components and their interactions

• Consider scalability, reliability, and performance

• Use design patterns and best practices

• Create diagrams like UML or flowcharts to visualize the design
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Q1. LRU Implementation
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LRU (Least Recently Used) is a cache eviction policy where the least recently accessed items are removed first.
• LRU cache stores key-value pairs with a maximum capacity.

• When a new key-value pair is added, if the cache is full, the least recently used item is removed.

• When a key is accessed, it is moved to the front of the cache to indicate it was recently used.
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Q2. Sell and buy stock
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