Quess Java Technology Lead Interview Questions, Process, and Tips

Round duration - 60 minutes
Round difficulty - Medium

Technical Interview round with questions on Java, Design Patterns etc.

Q1. What is a marker interface in Java?
Ans. 
A marker interface in Java is an interface with no methods, used to mark classes for special treatment.
• Marker interfaces are used to provide metadata to the classes implementing them.

• Examples of marker interfaces in Java include Serializable and Cloneable.

• Marker interfaces are typically empty interfaces with no methods.
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Q2. Where are instance variables of an object stored in the JVM?
Ans. 
Instance variables of an object in JVM are stored in the heap memory.
• Instance variables are stored in the heap memory allocated for the object.

• Each object has its own copy of instance variables.

• Instance variables are accessed using object references.
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Q3. What is the difference between the Factory and Abstract Factory design patterns?
Ans. 
Factory pattern creates objects without exposing the instantiation logic, while Abstract Factory pattern provides an interface for creating families of related or dependent objects.
• Factory pattern creates objects through a common interface, while Abstract Factory pattern creates families of related objects.

• Factory pattern uses a single method to create objects, while Abstract Factory pattern uses multiple methods to cr...read more
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Round duration - 60 minutes
Round difficulty - Medium

Technical Interview round with questions on Java, Microservice architecture, Kubernetes etc.

Q1. What is the architecture of Kubernetes?
Ans. 
Kubernetes follows a client-server architecture with a master node and worker nodes.
• Kubernetes architecture consists of a master node and multiple worker nodes.

• The master node manages the cluster and schedules applications.

• Worker nodes run the applications and communicate with the master node.

• Kubernetes uses etcd for storing configuration data.

• Components like kube-apiserver, kube-controller-manager, kube-scheduler, and
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Q2. What are Kafka Streams?
Ans. 
Kafka Streams is a client library for building real-time, highly scalable, fault-tolerant stream processing applications.
• Kafka Streams allows developers to process and analyze data in real-time as it flows through Kafka topics.

• It provides a high-level DSL for creating stream processing applications without the need for a separate processing cluster.

• Kafka Streams supports stateful processing, windowing, and joins, makin...read more
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Q3. What is an API Gateway?
Ans. 
An API Gateway is a server that acts as an API front-end, receiving API requests, enforcing throttling and security policies, passing requests to the back-end services, and then passing the response back to the requester.
• Acts as a single entry point for all API requests

• Handles authentication, authorization, and rate limiting

• Can transform requests and responses

• May aggregate multiple back-end services into a single API e
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