NEC Senior Software Engineer Interview Questions and Answers

Q1. DSA question on string, Build lowest number by removing n digits from a given number.
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Q2. Questions on Java 8 features, lambda, functional interface, streams, parallel streams. Multithreading questions: Executors, competable future, locks, synchronize, atomicInteger. Garbage collectors, algorit...read more
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Q3. Coding question to filter unique element on streams and 2 more using comparator.
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Q1. Questions on Jetpack compose, kotlin, hilt, permission, Testing,
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Q1. Questions on mvvm, clean architecture.
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Q1. Client round with questions on android permission, Android security
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Q1. Salary discussed
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Q1. DIscussed on mIcroservice arch with AWS
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Q2. Question related to spring boot annotations
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Q3. Questions related to design pattern
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Q1. Question related to previous project.
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Q2. Some questions of MySQL
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Q3. Multithreading related questions,
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Q1. Android interview asked about coroutines, flow, why we use MVVM instead of MVP, viewmodel pros and cons, security and how to hide keys in package
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2nd round was about again Android but more focused on security features of android

3rd round was live coding . I was asked to make an app from scratch in 1 hour without even using google.

Q1. Regarding all basic java , sprint boot questions
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Q2. More focused on Spring and microservices
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Q1. Advance java questions
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Q1. Explain advantages of Angular
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Angular offers advantages such as two-way data binding, dependency injection, and modular architecture.
• Two-way data binding allows automatic synchronization of data between the model and the view, reducing the need for manual DOM manipulation.

• Dependency injection helps manage dependencies and promotes code reusability by allowing components to be easily injected with their dependencies.

• Modular architecture enables deve...read more
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Q2. Explain about ngmodel
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ngModel is a directive in AngularJS that binds the value of HTML controls to application data.
• ngModel is used for two-way data binding in AngularJS.

• It can be used with input, select, textarea, and custom form controls.

• Example:
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Q1. Java coding questions
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Q2. Core java and spring questions
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Q1. Salary expectation
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Q1. Suppose we have list contains abc1, abcd,1231,null, empty then write java 8 code to find numbers only
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Q1. Salary discussion
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Q1. Lambda functions
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Q2. What is Streams in java8
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Streams in Java 8 provide a way to process collections of objects in a functional style.
• Streams allow for functional-style operations on collections, such as map, filter, and reduce.

• Streams can be sequential or parallel, allowing for efficient processing of large datasets.

• Streams do not store elements, they are processed on-demand as needed.

• Example: List names = Arrays.asList("Alice", "Bob", "Charlie"); Stream stream =
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Q3. Authentication vs Authorization
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Authentication verifies the identity of a user, while authorization determines what a user can access.
• Authentication confirms the user's identity through credentials like passwords or biometrics.

• Authorization determines the user's permissions and access levels to resources.

• Example: Logging into a system with a username and password is authentication. Being able to view certain files based on your role is authorization.
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Q4. How the Hashmap works
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Hashmap is a data structure that stores key-value pairs and allows for quick retrieval of values based on keys.
• Hashmap uses a hash function to map keys to indices in an array.

• Collisions can occur when multiple keys hash to the same index, which can be resolved using techniques like chaining or open addressing.

• Hashmap provides constant time complexity O(1) for insertion, deletion, and retrieval operations.

• Example: HashM...read more
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Q5. How to find duplicate in unsorted array
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Use a hash set to keep track of seen elements and identify duplicates in an unsorted array of strings.
• Iterate through the array and add each element to a hash set.

• If an element is already in the hash set, it is a duplicate.

• Example: ['apple', 'banana', 'apple', 'orange'] => 'apple' is a duplicate.
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Q1. Day to day responsibility
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Q2. How to handle http requests in Spring Boot
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Handling http requests in Spring Boot involves creating controller classes, mapping endpoints, and using annotations like @RestController and @RequestMapping.
• Create a controller class with @RestController annotation

• Map endpoints using @RequestMapping annotation

• Use @GetMapping, @PostMapping, @PutMapping, @DeleteMapping annotations for specific HTTP methods

• Inject dependencies using @Autowired annotation
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Q3. How different microservices communicate with each other
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Microservices communicate with each other through APIs, message queues, or event-driven architecture.
• APIs: Microservices can communicate with each other through RESTful APIs or GraphQL.

• Message queues: Services can use message brokers like RabbitMQ or Kafka to send and receive messages.

• Event-driven architecture: Services can publish events to a message broker and subscribe to events they are interested in.

• Service discov...read more
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Q4. Exception handling in spring boot
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Exception handling in Spring Boot involves using @ControllerAdvice, @ExceptionHandler, and ResponseEntity.
• Use @ControllerAdvice to define global exception handling for all controllers

• Use @ExceptionHandler to handle specific exceptions in individual controllers

• Return ResponseEntity with appropriate status codes and error messages
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Q5. Where will be microservices deployed in AWS
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Microservices can be deployed in AWS using services like ECS, EKS, Lambda, or Fargate.
• Microservices can be deployed on AWS Elastic Container Service (ECS) for containerized applications.

• AWS Elastic Kubernetes Service (EKS) can be used for deploying microservices using Kubernetes.

• Serverless microservices can be deployed using AWS Lambda.

• AWS Fargate provides serverless compute for containers, allowing for easy deployment
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Q1. Tell me something about yourself
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Q2. About your family
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Q3. What's your long term goals
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Q4. Salary expectations
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Q5. Location constraints etc
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