Software Development Engineer Interview Questions and Answers in 2025 (100+ Q&A)

Software Development Engineer SQL Server

Ques:- Can you give an example of Stored Procedure?

Asked In :- MBR Informatics, Code Insight Technologies, Hitachi Solutions India, HARITA TECHSERV, Siemens Healthineers, KFT, CloudThat, VuNet Systems, Real Time Data Services (P), Corecard Software,

Right Answer:
```sql
CREATE PROCEDURE GetEmployeeByID
@EmployeeID INT
AS
BEGIN
SELECT * FROM Employees
WHERE EmployeeID = @EmployeeID;
END;
```

JAVA Software Development Engineer

Ques:- Define Re-factoring in Software?

Asked In :-

Right Answer:
Refactoring in software is the process of restructuring existing code without changing its external behavior to improve readability, reduce complexity, and enhance maintainability.

JAVA Software Development Engineer

Ques:- Tell the Difference between synchronized and synchronized block?

Asked In :- Marolix Technology Solutions, first derivatives, suyati technologies, ofbusiness.com (ofb tech pvt ltd),

Right Answer:
The difference between `synchronized` and a synchronized block is:

- `synchronized` method locks the entire method for the object, preventing other threads from accessing any synchronized methods of that object.
- A synchronized block allows you to lock a specific section of code within a method, providing finer control over the locking mechanism and allowing other threads to access non-synchronized methods or blocks.

JAVA Software Development Engineer

Ques:- What will happen if non-synchronized method calls a static synchronized method and what kind of lock it acquires?

Asked In :- scandit,

Right Answer:
If a non-synchronized method calls a static synchronized method, the static synchronized method will acquire the class-level lock (the lock on the Class object itself) rather than an instance-level lock. This means that the static synchronized method can be executed by only one thread at a time across all instances of the class.

JAVA Software Development Engineer

Ques:- Differentiate between Static Synchronization vs. Instance Synchronization?

Asked In :- torc robotics,

Right Answer:
Static synchronization locks the class level (using static methods), ensuring that only one thread can access the synchronized static method at a time across all instances of the class. Instance synchronization locks the instance level (using instance methods), allowing only one thread to access the synchronized instance method for a specific object, while other instances can still be accessed by other threads.

JAVA Software Development Engineer

Ques:- What is the use of Join method?

Asked In :- DIGICOMM Semiconductor, Epiance Software, agami technologies, jktech,

Right Answer:
The `join()` method in Java is used to wait for a thread to die. When called on a thread, it causes the current thread to pause execution until the specified thread completes its execution.

JAVA Software Development Engineer

Ques:- What is the use of volatile in Java?

Asked In :- image infosystems,

Right Answer:
The `volatile` keyword in Java is used to indicate that a variable's value will be modified by different threads. It ensures that changes made by one thread to a volatile variable are visible to other threads immediately, preventing caching of the variable's value in thread-local memory.

JAVA Software Development Engineer

Ques:- What do you mean by Hash Code collision?

Asked In :- OIP,

Right Answer:
A hash code collision occurs when two different objects produce the same hash code value. This can lead to issues in data structures like hash tables, where unique keys are expected.

JAVA Software Development Engineer

Ques:- How static variable work in java?

Asked In :- sovos, scott logic, torc robotics,

Right Answer:
In Java, a static variable is associated with the class rather than any instance of the class. It is shared among all instances, meaning that if one instance modifies the static variable, the change is reflected across all instances. Static variables are initialized when the class is loaded and can be accessed using the class name.

JAVA Software Development Engineer

Ques:- What is Annotation in Java?

Asked In :- ctf, image infosystems,

Right Answer:
An annotation in Java is a special form of metadata that provides data about a program but is not part of the program itself. Annotations are used to give information to the compiler or to be processed at runtime by the Java Virtual Machine (JVM) or other tools. They are defined using the `@interface` keyword and can be applied to classes, methods, fields, and other elements.

A Software Development Engineer (SDE) is a foundational and highly sought-after professional in the technology industry, responsible for the entire lifecycle of software creation. These engineers are not just programmers; they are problem-solvers, designers, and innovators who transform ideas into functional, practical, and scalable software applications and systems. They work in a wide range of industries, from technology giants and startups to finance and healthcare, building the digital tools and platforms that power our modern world.

The core responsibilities of an SDE are extensive and varied, covering all stages of the development process:

Design and Architecture: SDEs are involved in the early stages of a project, collaborating with product managers and other engineers to design the architecture of a software system. This includes planning data structures, defining APIs, and making strategic technical decisions that will ensure the software is robust and maintainable.
Coding and Implementation: The primary task of an SDE is writing high-quality code. They are proficient in one or more programming languages (such as Python, Java, C++, or JavaScript) and follow best practices to create clean, efficient, and well-documented code that aligns with the system’s design.
Testing and Quality Assurance: SDEs are responsible for ensuring the reliability of their code. They write and execute various tests (unit, integration, and system tests) to identify and fix bugs, ensuring the software performs as expected and meets all quality standards before it is deployed to users.
Maintenance and Support: The job continues after a product is launched. SDEs provide ongoing support by monitoring system performance, addressing user feedback, and performing updates, patches, and feature enhancements to ensure the software remains current and secure.

To succeed in this role, an SDE must possess a strong foundation in computer science fundamentals, including data structures, algorithms, and software design principles. They must also have excellent problem-solving abilities, be adept at collaborating within a team environment, and possess a passion for continuous learning to keep up with the fast-paced evolution of technology. In essence, an SDE is a creative builder who plays a central role in driving innovation and bringing technological solutions to life.

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