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Er. Bhupendra
Er. Bhupendra

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ALL Architecture Asked In Interview

System Client API Control Worker Storage
Spring Boot Browser Controller Service Runtime DB
Kubernetes kubectl API Server Scheduler Nodes etcd
Docker CLI Docker Engine Container Manager Containers Images
Jenkins UI Controller Pipeline Agents Artifacts
Terraform CLI Provider API Planner Executors State

Great — this one universal architecture model can help you explain almost every backend / DevOps tool in interviews without memorizing separate diagrams.

Universal Software Architecture Model (90% of Systems)

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Think of every system as 5 layers.

1. Client Layer
2. Interface / API Layer
3. Control / Logic Layer
4. Execution / Worker Layer
5. Storage Layer
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1️⃣ Client Layer (Entry Point)

This is where the request starts.

Examples:

  • Browser
  • CLI command
  • REST API call
  • Mobile app

Example mapping:

Spring Boot

Browser / Postman
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Kubernetes

kubectl command
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Jenkins

Web UI / Git webhook
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2️⃣ Interface / API Layer

This layer receives requests and routes them.

Examples:

Tool Interface Layer
Spring Boot Controller
Kubernetes API Server
Docker Docker Engine API
Jenkins Jenkins Controller
Terraform Terraform CLI

Purpose:

  • authentication
  • routing
  • request validation

3️⃣ Control / Logic Layer

This layer decides what should happen.

Examples:

Tool Control Logic
Spring Boot Service Layer
Kubernetes Scheduler + Controller Manager
Jenkins Pipeline Engine
Terraform Execution Planner
Ansible Playbook Processor

Purpose:

  • orchestration
  • business logic
  • scheduling

4️⃣ Execution / Worker Layer

This layer does the real work.

Examples:

Tool Worker Layer
Spring Boot Application runtime
Kubernetes Worker Nodes
Docker Containers
Jenkins Agents
Ansible Managed Nodes

5️⃣ Storage Layer

This layer stores data or results.

Examples:

Tool Storage
Spring Boot Database
Kubernetes etcd
Jenkins Build artifacts
Terraform State file
Ansible Inventory + logs

Example: Mapping Kubernetes to Universal Model

Kubernetes

Client Layer
   kubectl

API Layer
   Kubernetes API Server

Control Layer
   Scheduler
   Controller Manager

Worker Layer
   Worker Nodes
   Pods
   Containers

Storage
   etcd
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Example: Mapping Spring Boot

Spring Boot

Client
  Browser / Postman

API Layer
  Controller

Logic Layer
  Service

Execution Layer
  Application runtime

Storage
  Database
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Example: Mapping Jenkins

Jenkins

Client
  Developer / Git webhook

API Layer
  Jenkins Web UI

Control Layer
  Pipeline Engine

Worker Layer
  Jenkins Agents

Storage
  Artifacts / Logs
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Interview Trick (Very Powerful)

When asked any architecture, answer using this order:

1. Entry point (client)
2. Request handling layer
3. Control / orchestration layer
4. Execution layer
5. Storage
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Example answer style:

“The architecture consists of a client layer where requests originate, an API layer that handles incoming requests, a control layer that manages scheduling and orchestration, worker nodes that execute tasks, and a storage layer that persists system state.”

This works for almost every tool.

Even Big Systems Follow This

System Client API Control Worker Storage
Spring Boot Browser Controller Service Runtime DB
Kubernetes kubectl API Server Scheduler Nodes etcd
Docker CLI Docker Engine Container Manager Containers Images
Jenkins UI Controller Pipeline Agents Artifacts
Terraform CLI Provider API Planner Executors State

The Secret

Almost all architectures are built from three core patterns:

  • Client–Server Architecture
  • Layered Architecture Pattern
  • Master–Worker Architecture Pattern

Combine these → you get Docker, Kubernetes, Jenkins, Spring Boot, Terraform, etc.

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