Java Backend Development - SDE Telegram Channel Link

Round 3 (Project Technical Round/ Client Round)

________

1: Introduction
2: Question based on work mentioned in resume (high Level Architecture)
3: Couple of followup questions on the same
4: Caching (Redis vs hazelcast, which one is better and how thet are different ?)
5: cached Evict policy and TTL of cache
6: What is kafka and when you will consider it to use
7: What is partition in kafka ? How many can we have and how do we decide
8: What is offset ? how do we ensure no duplicate data in kafka and same using springBoot ?
9: Ideompodency in kafka ?
10: Can we fetch old date kafka message ? if so then how ?
11: High level architecture of kafka (producer, consume, partition, offset, cluster, broker, topic) ?
12: Cosumer slowness cause and how to fix it?
13: @SpringBoot Annotations related questions
14: What is transectional in SpringBoot
15: What is springproxy ? how does this work
16: What is sharding ?
17: What is idexing ? How soes this helps ?
18: Scenario based question on Joins ? inner join , left join and right join
19: nth highest salary
20 : java streams and parallel streams
21: Completable future spring Boot
22: Global exception handling

EXL Service
_______
Round 2:



1: Introduction
2: Latest project/product you are working on
3: Dig down failed scenarios on your project
4: Kafka flow in project
5: Update spring application server port
6: On Mongo, what feature you are using
7: @Repository
8: JPA, @Query
9: String Pool, heap memory, How many objects will be created
10: Longest non repeating sub string
11: Dig down on the above coding qiestion
12 : parth variable and query
13: Patch vs PUT

EXL SERVICE.
————————————————————————
Round 1:

Introduction
-> Education
-> Work Experience
-> Tech Stack
-> Current Projects& Works

1: HashMap Vs HashTable
2: What is ConcurrentHashMap
3: Internal Working of HashMap
4: What is kafka and how its used and useful in which scenarios
5: What is partition in kafka
6: How to maintain order in kafka
7: What is streams in java ? when we can use it
8: What is parallel Streams ? when to use it
9: What is memoryLeaks and how do we handle it
10: How you will optimize the slow API ?
11: CDN ?
12: Prime number java code
13: Reverse String Java Code
14: Use Regex to identify if string contains vowels or not?
15: Stream API groupingBy questions
16: @Controller vs @RestController
17: Microservices vs Monolith, when to use which one ?
18: Major problem faced in prod? how did you tackle it?

[7] Top 10 docker Commands You need To Learn - DEV Community https://dev.to/hasanelsherbiny/top-10-docker-commands-you-need-to-learn-47cj
[8] Top 12 Git commands every developer must know https://github.blog/developer-skills/github/top-12-git-commands-every-developer-must-know/
[9] kubectl Quick Reference | Kubernetes https://kubernetes.io/docs/reference/kubectl/quick-reference/
[10] 10 Git Commands Every Developer Should Know https://www.freecodecamp.org/news/10-important-git-commands-that-every-developer-should-know/
[11] Kubectl Command Cheatsheet - Blue Matador https://www.bluematador.com/learn/kubectl-cheatsheet
[12] Docker Commands - GeeksforGeeks https://www.geeksforgeeks.org/devops/docker-instruction-commands/
[13] A list of commonly used Git commands https://github.com/joshnh/Git-Commands
[14] Top 10 AWS CLI Commands That'll Save You 100 Clicks a Day https://aws.plainenglish.io/top-10-aws-cli-commands-thatll-save-you-100-clicks-a-day-8a596e7ae0e4
[15] [PDF] CLI Cheat Sheet - Docker Docs https://docs.docker.com/get-started/docker_cheatsheet.pdf
[16] Best practices for working with AWS Lambda functions https://docs.aws.amazon.com/lambda/latest/dg/best-practices.html
[17] GIT CHEAT SHEET https://education.github.com/git-cheat-sheet-education.pdf
[18] Kubectl Cheat Sheet Commands & Examples - Okteto https://www.okteto.com/blog/kubectl-cheat-sheet/
[19] Useful Docker commands - HCL Product Documentation https://help.hcl-software.com/domino/14.5.0/admin/inst_dock_useful_commands.html?scLang=en
[20] Code examples for Lambda using AWS SDKs https://docs.aws.amazon.com/lambda/latest/dg/service_code_examples.html

Here is a concise list of the 10 most used commands for GitHub (Git), Kubernetes, Docker, and AWS Lambda, based on modern usage patterns and leading references

## GitHub (Git) Commands

- git clone: Clone a repository to the local machine
- git status: Show the working directory status
- git add: Add files to staging area[8].
- git commit: Commit staged files with a message
- git push: Push local commits to remote repo
- git pull: Fetch and merge changes from remote
- git branch: List, create, or delete branches
- git checkout: Switch branches or restore files
- git merge: Merge changes from a branch
- git log: Show commit history

## Kubernetes (kubectl) Commands

- kubectl get pods: List pods
- kubectl get services: List services
- kubectl get nodes: List nodes
- kubectl describe pod <pod_name>: Detailed pod info
- kubectl create -f <file.yaml>: Create resources from YAML
- kubectl delete pod <pod_name>: Delete a pod
- kubectl logs <pod_name>: View pod logs
- kubectl exec -it <pod_name> -- /bin/sh: Run command in pod
- kubectl apply -f <file.yaml>: Apply changes from YAML
- kubectl scale deployment <name> --replicas=<number>: Scale deployment

## Docker Commands

- docker run: Run a container from an image
- docker pull: Download an image from registry
- docker ps: List running containers
- docker stop <container>: Stop a running container
- docker start <container>: Start a stopped container
- docker rm <container>: Remove a container
- docker images: List images
- docker rmi <image>: Remove an image
- docker exec -it <container> /bin/bash: Run a shell in a running container
- docker build -t <tag> .: Build an image from Dockerfile

## AWS Lambda CLI Commands

- aws lambda list-functions: List all Lambda functions
- aws lambda get-function --function-name <name>: Get function configuration
- aws lambda create-function ...: Create a Lambda function
- aws lambda update-function-code --function-name <name> --zip-file fileb://file.zip: Update function code
- aws lambda invoke --function-name <name> output.txt: Invoke function
- aws lambda delete-function --function-name <name>: Delete function
- aws lambda update-function-configuration ...: Update function settings
- aws lambda add-permission ...: Add resource permissions
- aws lambda list-versions-by-function --function-name <name>: List all versions
- aws lambda create-alias --function-name <name> --name <alias> --function-version <version>: Create alias



Citations:
[1] 25 Essential Git Commands for Developers https://www.hatica.io/blog/git-commands-for-developers/
[2] Kubectl Cheat Sheet - 15 Kubernetes Commands & Objects - Spacelift https://spacelift.io/blog/kubernetes-cheat-sheet
[3] Docker Docs https://docs.docker.com/reference/cli/docker/
[4] What are the most common AWS CLI commands used by developers? https://moldstud.com/articles/p-what-are-the-most-common-aws-cli-commands-used-by-developers
[5] Small snippets of AWS CLI commands for the AWS Lambda function https://rahullokurte.com/small-snippets-of-aws-cli-commands-for-the-aws-lambda-function
[6] Chapter 9: Kubectl Cheat Sheet - Kubernetes Guides - Apptio https://www.apptio.com/topics/kubernetes/devops-tools/kubectl-cheat-sheet/

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Important must do Linked list questions

Important Tree must do question

Java Interview question for freshers (4-6 LPA)

Round 1(Coding Round):
-> 5 Coding Question
---------------------------------
Topics Covered
1:LinkedList
2:Array Manupulation
3:String Manupulation(ex:Reverse word of sentence)
4:n'th Fibonacii Number

Round 2:
-> Technical Interview:
------------------------------------
Oops Concepts
Explain All Oops Concepts with example
JVM, JDK, JRE
What is JDBC
Interface vs class
Implements vs Extends
What is Thread
Thread Life Cycle
Collections In Java
Joins In sql
Code:
Write code to find fibonacii number
Write code to find factorial of a number

Round 3:
->Technical Interview:
---------------------------------------
LinkedList vs ArrayList
HashMap
HashMap Implementation
List of JDBC Interfaces
Explain different Shorting algorithms
What is Tree & explain BST
SQL
Joins(left, right, inner,outer)
Index in DBMS
Views in SQL
Discussion on Final Year Project
Code:
Write code to print triangle pattern
Write code to print Diamond Pattern

Round 4:
->HR Interview
----------------------------------------
Introduction
Strength & weakness
What you friends & Teachers think about you
About company
Will location change be a issue for you
Why this company
Share your achivements

Senior Java Developer

Technical Round 2


1: Question based on overloading

Sum (int a, int b)( //update a and b value

Sum(Integer a, Integer b)(

//update a and b value

Will the value update for a and b in both the cases ?

->pass HashMap in one method and update the value in it, Will the original Hashmat size will be zero or gets updated to 1 after method call

2: SOLID principles

3: Threading, how to create deadlock and how to avoid deadlock. code

4: @Controller advice & @ExceptionalHandler

5: HashMap and one coding question based on HashMap

6: Sum of pair which in nearest/closest to the target value (from two array)

doubly linked list

7: Create a class and short using comparable and comparator when to use which

8: LinkedList and its implementation using class and scenario based questions on singly and doubly linkedlist

9: What is docker, how image I created and deployed

10: Kafka & zookeeper

11: What is indexing

12: Question on left join and right join

13: Indexing on unique and non unique column

14: Procedures in DB

15: System design(HLD) question based on creating the order admin portal (Which DB, RBAC, API's, Interservice communication, Async and non async call, S3 Bucket,Kafka for pub-sub model, replication factor, scaling)

Senior Java Developer

Technical Round 1

1: Singleton class and factory design pattern(implementation and concepts)
2: Can singleton instace be cloned if so is it breaking the principles of it.
3: Run one thread at a time if multiple thread are calling ine method ( use of synchronized in thread)
4: comparable and comparator implementation
5: Find the occurence of "ab" In array of words, each word can have one or multiple occurance.
6: Rest API, pathvariable vs request param difference with example
7: index in sql use and syntax
8: 4th heighest salary in SQL
9: Rest vs Soap
10: how we can avoid object to be cloned (shallow and deep cloning)
11: Transient vs temporal in Spring Boot
12: Rest Architecture
13: JWT token use and Spring Security
14: Redis cache and Hazelcast cache use
15: Zookeeper kafka

System design concepts
Cdn
Proxy
Caching
Use of S3 bucket
Pop
Sql vs nosql
Gateway

Important for java interview

Rebase will put your commits on top of the master/the branch u will be rebasing with.

How to rebase your local branch with master branch???

1: git checkout origin master
2: git pull origin master
3: git checkout local-branch
4: git rebase origin master
5: resolve conflicts and use git add to add those file
--> git add file_path

6: git rebase -- continue

Once the (local-branch | Rebase 10/20)

Becomes local-branch


Then git commit -m "commit message"

Git push origin local-branch

Latest Java Interview experience
1: Design DB for an portal
2: Volatile keyword
3: Record keyboard
4: views in sql
5: what is annotion & explain different types of annotations in spring boot