Mercedes-Benz Research and Development India Backend Developer Interview Questions and Answers

MCQ'S on Core Java, Java8, SQL, Microservices and Coding question in Java.

Q1. Java 8 concepts, Multi threading, Collections, Microservices, SOLID PRINCIPLES, Design Patterns and Java 8 coding and SQL queries
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Q2. Take a list and find the list containing prime numbers in list, Find the highest salary of employees using streams and also basic SQL queries on joins
Ans. 
Use Java streams to filter prime numbers from a list, find highest employee salary, and demonstrate basic SQL joins.
• Use Java streams to filter prime numbers from the list

• Use streams to find the highest salary of employees

• Demonstrate basic SQL queries for joins
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SQl, Spring, Spring BOOT< hibernate, JPA

Q1. Why should we hire you. ?
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Q2. Why you want this job.?
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Round duration - 60 minutes
Round difficulty - Easy

Technical Interview round that lasted for around 60 minutes. Questions were based on Node JS concepts.

Q1. Node Js Question
How does Node JS work?
Ans. 
Node.js is lightweight and efficient because it is built on an event-driven design with asynchronous I/O. It uses uses JavaScript as its scripting language and runs Chrome’s V8 JavaScript engine. It's used in desktop programs and with a popular framework called electron because it has APIs for accessing OS-level functionality like file systems, networks, and so on.
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Q2. Technical Question
What are middlewares?
Ans. 
Middleware are basically just functions that have full access to both request and response objects.

var app = express();

app.use(cookieParser());
app.use(bodyParser());
app.use(logger());
app.use(authentication());

app.get('/', function (req, res) {
// ...
});

app.listen(3000);

Whether you wish to design your own middleware or use the framework's built-in middlewares, an Express application is simply Node.js with a host of middl...read more
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Q3. Node Js Question
What is Event Emitter?
Ans. 
EventEmitter is a Node.js class that includes all the objects that are basically capable of emitting events. This can be done by attaching named events that are emitted by the object using an eventEmitter.on() function. Thus whenever this object throws an even the attached functions are invoked synchronously.
Example:
const EventEmitter = require('events');
class MyEmitter extends EventEmitter {}
const myEmitter = new MyEm...read more
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Q1. Java,Spring,hibernate,SQL
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