10+ Software Engineer2 Interview Questions and Answers for Freshers

Find pair of elements in array whose sum is equal to target k.

• Use a hashmap to store the difference between target k and each element in the array.

• Iterate through the array and check if the current element's complement exists in the hashmap.

• Return the indices of the pair that sums up to target k.

The task is to find the frequency of subsequent characters in a given input string.

• Iterate through the input string while keeping track of the current character and its frequency.

• If the current character is the same as the previous character, increment the frequency count.

• If the current character is different, append the previous character and its frequency to the output string.

• Repeat until the end of the input string is reached.

Actuator in Spring Boot provides production-ready features like monitoring and metrics.

• Actuator is a set of tools provided by Spring Boot to monitor and manage your application.

• Actuator endpoints are URLs that provide information about your application, such as health, metrics, info, etc.

• Examples of actuator endpoints include /actuator/health, /actuator/metrics, /actuator/info, etc.

Paytm uses microservices architecture for scalability and flexibility in system design.

• Paytm's system design is based on microservices architecture to break down the application into smaller, independent services.

• Each service in Paytm's architecture handles a specific function, such as payments, wallet, or shopping.

• Microservices communicate with each other through APIs, allowing for easier scalability and maintenance.

• This architecture enables Paytm to quickly add new features...read more

Branching strategies in Agile methodologies involve creating separate branches for different features or tasks to enable parallel development.

• Feature branching: Each feature or user story is developed in a separate branch, allowing for isolation and independent testing.

• Release branching: A branch is created for each release, enabling bug fixes and maintenance to be done separately from ongoing development.

• Task branching: Developers create branches for individual tasks or sub-...read more

Microservices architecture is a design pattern where an application is composed of small, independent services that communicate over well-defined APIs.

• Each microservice is responsible for a specific business function or capability

• Services are loosely coupled and can be developed, deployed, and scaled independently

• Communication between services is typically done through lightweight protocols like HTTP or messaging queues

• Microservices architecture promotes flexibility, scalabil...read more

Stateless widgets do not store any state information, while stateful widgets can hold and update state data.

• Stateless widgets are immutable and do not change their state during the build process.

• Stateful widgets can hold and update state data, causing them to rebuild when the state changes.

• Stateless widgets are more efficient as they do not need to manage state information.

• Stateful widgets are useful for interactive UI components that need to update based on user input.

• Exampl...read more

I have extensive experience with Java, focusing on object-oriented programming, frameworks, and building scalable applications.

• Proficient in Java SE and Java EE, with hands-on experience in building web applications using Spring Boot.

• Implemented RESTful APIs for data exchange, enhancing application interoperability.

• Utilized Java Collections Framework for efficient data manipulation and storage.

• Worked with JUnit and Mockito for unit testing, ensuring code reliability and maint...read more

Designing the architecture for Uber's software system

• Use microservices architecture for scalability and flexibility

• Implement a robust backend system for handling user requests and driver matching

• Utilize real-time data processing for tracking driver locations and ride requests

• Incorporate a payment gateway for seamless transactions

• Include a rating system for feedback and quality control

Detecting a cycle in a linked list can be done using Floyd's Tortoise and Hare algorithm.

• Use two pointers: slow and fast. Slow moves one step, fast moves two steps.

• If there's a cycle, the fast pointer will eventually meet the slow pointer.

• If the fast pointer reaches the end (null), there is no cycle.

• Example: For a list 1 -> 2 -> 3 -> 4 -> 2 (cycle back to 2), slow and fast will meet at 2.