Software Engineer 路 Intern to senior

General Software Engineer Interview Questions: Fundamentals, Coding and Design

General software engineering interviews are usually language-agnostic. Expect a coding problem, questions about how a language you know works under the hood, a design discussion and behavioral questions about how you work with a team.

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112 questions

  • JavaScriptEasy

    What is hoisting in JavaScript?

    Hoisting is JavaScript moving declarations to the top of their scope during compilation, so functions and var variables can be referenced before the line where they are written.

    Intern 路 Junior 路 Functions & Scope
  • C#Easy

    What is the difference between string and StringBuilder in C#?

    A string is immutable, so every change creates a new string object, while StringBuilder is a mutable buffer that modifies its contents in place, making it much faster for repeated concatenation.

    Intern 路 Junior 路 Performance
  • JavaEasy

    What is the difference between JDK, JRE and JVM in Java?

    The JVM runs Java bytecode, the JRE is the JVM plus the standard libraries needed to run Java programs, and the JDK is the JRE plus the development tools such as the compiler (javac).

    Intern 路 Junior 路 Programming Fundamentals
  • JavaEasy

    What is the difference between == and equals() in Java?

    == compares primitives by value and objects by reference (whether they are the exact same object), while equals() compares the logical content of two objects when the class overrides it.

    Intern 路 Junior 路 Programming Fundamentals
  • JavaEasy

    What is the difference between final, finally and finalize in Java?

    final is a keyword that prevents reassigning a variable, overriding a method or extending a class; finally is a block that always runs after try/catch for cleanup; finalize() was a method called by the garbage collector and is now deprecated.

    Intern 路 Junior 路 Programming Fundamentals
  • PythonEasy

    What is the difference between a list and a tuple in Python?

    A list is mutable and can be changed after creation, while a tuple is immutable; tuples are slightly faster, use less memory and can be used as dictionary keys when their items are hashable.

    Intern 路 Junior 路 Data Structures
  • GitEasy

    What is Git and how is it different from GitHub?

    Git is a distributed version control system that tracks changes to files on your machine; GitHub is a hosting service for Git repositories that adds collaboration features such as pull requests, code review and CI.

    Intern 路 Junior 路 Git
  • GitEasy

    What is the difference between git fetch and git pull?

    git fetch downloads new commits from the remote without changing your working branch; git pull runs a fetch and then merges (or rebases) those commits into your current branch.

    Intern 路 Junior 路 Git
  • DockerEasy

    What is the difference between a Docker container and a virtual machine?

    A virtual machine runs a full guest operating system on virtualised hardware, while a container shares the host鈥檚 kernel and isolates only the process, its filesystem and resources, which makes containers much lighter and faster to start.

    Intern 路 Junior 路 DevOps
  • DockerEasy

    What is the difference between a Docker image and a container?

    An image is a read-only template made of layers that contains the application and its dependencies; a container is a running (or stopped) instance of an image with its own writable layer on top.

    Intern 路 Junior 路 DevOps
  • Software TestingEasy

    What is the difference between unit, integration and end-to-end tests?

    Unit tests check one small piece of code in isolation, integration tests check that several pieces work together (for example code plus a real database), and end-to-end tests drive the whole application the way a user would.

    Intern 路 Junior 路 Testing
  • JavaScriptEasyCoding

    How do you check if a string is a palindrome in JavaScript?

    Normalise the string (lower case, remove non-alphanumeric characters), then compare characters from both ends moving inward with two pointers. This is O(n) time and O(1) extra space beyond the normalised copy.

    Intern 路 Junior 路 Coding Problems