10+ Locus IT Services Interview Questions and Answers

Interview question on Java 8 features, Spring Boot, Microservices, and SQL queries for Senior Engineer role.

• Java 8 features include lambda expressions, functional interfaces, streams, and default methods.

• Spring Boot is a framework for building microservices with minimal configuration.

• Microservices architecture involves breaking down a large application into smaller, independent services.

• SQL queries are used to retrieve data from a database. Examples include SELECT, INSERT, UP...read more

Garbage collection is an automatic memory management process. It frees up memory occupied by objects that are no longer in use.

• Garbage collection is used in programming languages like Java, Python, and C#.

• It helps prevent memory leaks and improves program efficiency.

• For example, in Java, the garbage collector runs periodically to identify and remove objects that are no longer referenced by the program.

• Garbage collection algorithms include reference counting, mark-and-sweep, a...read more

Coroutines are a concurrency design pattern in Kotlin that allow for asynchronous programming.

• Coroutines are lightweight threads that can be used to perform non-blocking operations.

• They are based on the concept of suspending functions, which can be paused and resumed.

• Coroutines use a dispatcher to determine which thread or thread pool to run on.

• They can be used to simplify asynchronous code and avoid callback hell.

• Coroutines can be used with various libraries and frameworks, ...read more

Core concepts of JavaScript include variables, data types, functions, objects, and control flow.

• Variables are used to store data values.

• Data types include strings, numbers, booleans, arrays, and objects.

• Functions are blocks of code that can be called and executed.

• Objects are collections of key-value pairs.

• Control flow includes if statements, loops, and switch statements.

Prod defects are handled by identifying, prioritizing, and resolving them in a systematic manner.

• Create a process for reporting and tracking defects

• Prioritize defects based on impact and severity

• Assign resources to investigate and fix defects

• Perform root cause analysis to identify the underlying issues

• Implement fixes and thoroughly test them before deploying

• Communicate with stakeholders about the status and resolution of defects

Design a scalable tiny URL service with unique requests and efficient read operation.

• Use a hashing algorithm to generate unique short URLs from long URLs

• Store the mappings in a distributed key-value store like Redis or Cassandra

• Use a load balancer to distribute requests across multiple servers

• Implement caching to improve read performance

• Consider using a CDN to serve frequently accessed URLs

• Implement rate limiting and throttling to prevent abuse

• Use HTTPS to ensure secure commu...read more

Activity is a single screen with a user interface, while Fragment is a modular section of an activity.

• Activity represents a single screen with a user interface.

• Fragment is a modular section of an activity that can be combined with other fragments to create a multi-pane UI.

• Activities are used to handle user interactions and manage the lifecycle of an app.

• Fragments are reusable components that can be added or removed from an activity dynamically.

• Activities are typically used fo...read more

A suspend function is a function that can be paused and resumed later without blocking the main thread.

• Suspend functions are used in Kotlin coroutines to perform asynchronous operations.

• They are defined using the 'suspend' keyword.

• Suspend functions can only be called from other suspend functions or from coroutine scopes.

• They can be used to perform network requests, database operations, or any other long-running tasks without blocking the main thread.

• Suspend functions can be u...read more

RxJava is a library for composing asynchronous and event-based programs using observable sequences. Coroutines are a new way of writing asynchronous code in a sequential manner.

• RxJava is based on the Observer pattern and uses operators to transform and combine observable sequences.

• Coroutines are lightweight threads that can be suspended and resumed, allowing for sequential and structured concurrency.

• RxJava is widely used in Android development and has a large ecosystem of ope...read more