Complete Full-Stack & DevOps Interview Master Guide

Shreyesh kolhe

June 10, 2026 June 10, 2026

Complete Full-Stack & DevOps Interview Master Guide

Hey everyone! Welcome to the Complete Full-Stack & DevOps Interview Master Guide!

This guide is a consolidated question bank covering everything you need to ace your next full-stack or DevOps interview — from JavaScript basics to Kubernetes orchestration.

What we will cover:

JavaScript Fundamentals & Express.js
React.js Frontend Architecture
Node.js Runtime & NestJS Framework
Authentication, Authorization & Security
Microservices Architecture, Performance & Scalability
Database Design, Operations & Internals
Cloud Infrastructure (AWS), Docker & Kubernetes
CI/CD — GitHub Actions & Jenkins

Interview Preparation Map:
==========================

Full-Stack & DevOps
        │
        ├── Frontend ──── JavaScript, React.js
        │
        ├── Backend ───── Node.js, NestJS, Express.js
        │
        ├── Security ──── Auth, JWT, OAuth, RBAC
        │
        ├── Architecture ─ Microservices, Scalability
        │
        ├── Database ───── SQL, NoSQL, Indexing, Sharding
        │
        └── DevOps ──────── AWS, Docker, Kubernetes, CI/CD

01 — JavaScript Fundamentals & Express.js

Core language concepts, async patterns, and Express.js server-side fundamentals.

Core JavaScript Questions:

What is JavaScript?
Explain data types in JavaScript.
Difference between var, let, and const?
What is Hoisting?
What is the Temporal Dead Zone?
Explain Promises, callbacks, and async/await.
What is async/await? Explain sync and async. (Important)
Explain closure.
Difference between normal functions and Arrow functions?
What is scope and Lexical scope?
What are the new features introduced in ES6?
Explain Debounce and Throttle.
Explain Promise combinators: Promise.all, Promise.any, Promise.race, and Promise.allSettled.
Explain call, apply, and bind methods.
Explain Event Loop in JavaScript.
Difference between Shallow copy vs Deep copy?
Tell common array in-built methods.
Explain Destructuring and Spread operator.
What is the Rest operator?
Explain the this keyword in different contexts.
Explain map, filter, and reduce methods.

Express.js Questions:

What is middleware in Express.js? How does middleware work internally?
How do you handle errors in Express.js?
What is error handling middleware?
What is CORS? How do you enable CORS in Express?
What is Helmet? Why is Helmet used?
What is rate-limiting? How do you implement rate limiting?
What is centralized error handling?
What is a REST API?
Difference between PUT and PATCH?
How do you upload files in Express? What is Multer?
How do you secure an Express application?

Express.js Request Lifecycle:
==============================

Incoming Request
      │
      ▼
┌─────────────────────┐
│  Global Middleware  │  ← Helmet, CORS, Body Parser
└─────────┬───────────┘
          │
          ▼
┌─────────────────────┐
│  Route Middleware   │  ← Auth, Rate Limiter
└─────────┬───────────┘
          │
          ▼
┌─────────────────────┐
│  Route Handler      │  ← Your Logic
└─────────┬───────────┘
          │
          ▼
┌─────────────────────┐
│  Error Middleware   │  ← Centralized Error Handler
└─────────────────────┘

02 — React.js Frontend Architecture

Hooks, state management, rendering optimizations, and advanced React patterns.

Core React Questions:

What is React?
What is lifting state up?
What is React Fiber?
Explain useMemo and useCallback.
What is React.memo?
Explain useEffect hook in detail.
Explain React strict mode.
What are the rules of React hooks?
What is Virtualization in long lists?
SSR vs CSR (Server-Side Rendering vs Client-Side Rendering).
What triggers a re-render in React?
Difference between functional and class components.
What are React hooks?
What is useState?
Why is state update asynchronous in React?
What is batching in React?
How do you optimize React performance?
What is prop-drilling? How do you avoid prop-drilling?
What is Redux? Explain Redux flow.
Controlled vs uncontrolled components.
What are render props?
What is lazy loading in React?
What is code splitting?
What is concurrent rendering?
What is Suspense?
What is hydration in React?
What is Next.js?
Difference between state and props.
How do you handle API calls in React?
How do you prevent unnecessary API calls in React?
How do you manage authentication in React?
What are Error Boundaries?
Can Error Boundaries catch async errors?
How do you structure a large React app?
What is tree shaking?
What is bundle optimization?
What are stale closures in React?
Explain custom hooks.
What is Context API?
What is Virtual DOM and the Diffing algorithm?
What is a Higher Order Component (HOC)?
What are Portals in React?
What is Reconciliation?
What is JSX?

React Re-render Triggers:
=========================

State Change  ──────────────────────────┐
Props Change  ──────────────────────────┤
Context Change ─────────────────────────┤──► Component Re-renders
Parent Re-render ───────────────────────┤
forceUpdate() ──────────────────────────┘

How to Prevent Unnecessary Re-renders:
=======================================
React.memo     → Memoize component
useMemo        → Memoize computed value
useCallback    → Memoize function reference

03 — Node.js Runtime & NestJS Framework

Event loop, streams, clustering, worker threads, and NestJS dependency injection patterns.

Node.js Questions:

What is Node.js?
Explain the Node.js Event Loop.
Why is Node.js single-threaded?
If Node.js is single-threaded, how does it handle multiple requests concurrently?
What are the phases of the Event Loop?
Difference between sync and async code?
Difference between process.nextTick() and setImmediate()?
Difference between setTimeout() and setImmediate()?
What is callback hell? How do you solve it?
How does async/await work internally?
What are streams in Node.js?
Why are streams better for large file handling?
What is backpressure in streams?
What are buffers? Difference between streams & buffers?
What are worker threads?
What is the cluster module in Node?
Difference between cluster & worker threads?
How do you scale a Node.js application?
Explain Node.js memory management and memory leaks.
How does Node.js handle file uploads?
How do you improve Node.js application performance?
What are the advantages & disadvantages of a Node.js app?
Explain Node.js architecture.
How would you design a scalable Node.js backend?
How would you identify & fix performance issues in Node?
What is profiling? What is benchmarking?
What is unhandled promise rejection?
How do you secure a Node.js application?

Node.js Event Loop Phases:
==========================

   ┌──────────────────────────┐
   │         timers           │  ← setTimeout, setInterval
   └────────────┬─────────────┘
                │
   ┌────────────▼─────────────┐
   │     pending callbacks    │  ← I/O errors
   └────────────┬─────────────┘
                │
   ┌────────────▼─────────────┐
   │       idle, prepare      │  ← Internal use
   └────────────┬─────────────┘
                │
   ┌────────────▼─────────────┐
   │           poll           │  ← Fetch new I/O events
   └────────────┬─────────────┘
                │
   ┌────────────▼─────────────┐
   │          check           │  ← setImmediate
   └────────────┬─────────────┘
                │
   ┌────────────▼─────────────┐
   │     close callbacks      │  ← socket.on('close')
   └──────────────────────────┘

process.nextTick() → Runs before next phase (highest priority)

NestJS Questions:

What is NestJS?
What is dependency injection in NestJS?
What are modules in NestJS?
What are controllers in NestJS?
What are providers/services in NestJS?
What is a decorator?
What are DTOs (Data Transfer Objects) in NestJS?
Difference between middleware, guards, interceptors, and pipes in NestJS?
What are guards in NestJS?
What are interceptors in NestJS?
What is the lifecycle of a request in NestJS?
What is AuthGuard in NestJS?
How do you create protected routes in NestJS?
How do you implement role-based access control (RBAC)?
What is RolesGuard?

NestJS Request Lifecycle:
=========================

Incoming Request
      │
      ▼
Middleware         → Runs before route handler
      │
      ▼
Guards             → Authentication / Authorization check
      │
      ▼
Interceptors (pre) → Transform request
      │
      ▼
Pipes              → Validation & transformation of input
      │
      ▼
Route Handler      → Your controller method
      │
      ▼
Interceptors (post)→ Transform response
      │
      ▼
Exception Filters  → Handle errors
      │
      ▼
Response

04 — Authentication, Authorization & Security

JWT, OAuth, sessions, RBAC, bcrypt, and secure API design.

Difference between authentication and authorization?
What is JWT? Explain the structure of JWT.
What is an access token? What is a refresh token?
Why are refresh tokens needed?
Difference between session-based auth and JWT auth?
Where should JWT tokens be stored securely?
How does the refresh token workflow work?
How does logout work in JWT authentication?
How do you invalidate a JWT token?
Why should passwords be hashed? (Bcrypt)
Difference between hashing and encryption?
What is OAuth? OAuth vs JWT?
What is RBAC (Role-Based Access Control)?
How do you secure APIs against vulnerabilities?
How do you handle multiple device logins?
Explain the complete login flow from frontend to backend.
LocalStorage vs cookies for token storage?
Password hashing with bcrypt.
Logout flow design in JWT Auth.

JWT Structure:
==============

Header.Payload.Signature
   │       │       │
   ▼       ▼       ▼
Base64  Base64  HMAC/RSA
Encoded Encoded  Hash

Example:
eyJhbGciOiJIUzI1NiJ9   ← Header
.eyJ1c2VySWQiOiIxMjMifQ ← Payload (userId, role, exp)
.SflKxwRJSMeKKF2QT4fw   ← Signature


Complete Login Flow:
====================

User enters credentials
        │
        ▼
Frontend sends POST /login
        │
        ▼
Backend validates credentials
        │
        ▼
Backend hashes password → bcrypt.compare()
        │
        ▼
Generate Access Token (15min) + Refresh Token (7d)
        │
        ▼
Store Refresh Token in DB / Redis
        │
        ▼
Send Access Token to client

05 — Microservices Architecture, Performance & Scalability

Service decomposition, messaging, caching, load balancing, and distributed patterns.

Microservices Questions:

What are microservices?
Difference between monolith and microservices architecture?
What are the advantages and disadvantages of microservices?
When should you USE and NOT USE microservices?
What is service decomposition?
How do you split services in a microservices architecture?
Database-per-service pattern vs shared database?
Why is a shared database discouraged in microservices?
What is loose coupling? What is high cohesion?
Synchronous vs asynchronous communication between services.
REST vs gRPC vs Message Queues.
What is service discovery?
What is an API Gateway? Explain clearly.
What is load balancing? Explain in detail.
Explain client-side vs server-side load balancing.
Explain reverse proxy.
What is a circuit breaker pattern? What problem does it solve?
What is a retry mechanism? What is exponential backoff?
What is distributed tracing? What is centralized logging?
What is a Correlation ID?
What is eventual consistency? Difference between strong and eventual consistency?
What is the Saga pattern? What are distributed transactions?
What is a message broker? RabbitMQ vs Kafka.
What is event-driven architecture?

Performance & Scalability Questions:

What is scalability?
Horizontal scaling vs vertical scaling?
How does a load balancer distribute incoming traffic?
What is caching? What are the common types of caching?
Client-side cache vs server-side cache.
What is Redis? Why does Redis improve application performance?
What is cache invalidation? Explain cache invalidation strategies.
What is a CDN (Content Delivery Network)? How does a CDN improve performance?
What is lazy loading? What is pagination?

Monolith vs Microservices:
==========================

Monolith                    Microservices
─────────                   ─────────────

┌───────────────┐           ┌───────┐  ┌───────┐
│               │           │  Auth │  │ User  │
│  Auth         │           │Service│  │Service│
│  User         │           └───────┘  └───────┘
│  Payment  ────┼──────►
│  Orders       │           ┌───────┐  ┌───────┐
│  Products     │           │Payment│  │Orders │
│               │           │Service│  │Service│
└───────────────┘           └───────┘  └───────┘

Single deployable unit      Independent deployable services
Single DB                   Database per service
Easier to develop           Harder to manage
Hard to scale               Easy to scale individually


Circuit Breaker Pattern:
========================

Service A ──────► Service B (DOWN!)
                       │
                       ▼
              Circuit OPENS after
              N failed attempts
                       │
                       ▼
           Return fallback response
           (Don't call B for 30 sec)
                       │
                       ▼
           Circuit tries HALF-OPEN
           (Test one request)
                       │
              ┌────────┴────────┐
              │                 │
           Success           Failure
              │                 │
           CLOSED            OPEN again

06 — Database Design, Operations & Internals

SQL, NoSQL, indexing, ACID properties, sharding, replication, and query optimization.

SQL Fundamentals:

What is SQL? Difference between SQL and NoSQL?
What is DDL, DML, DCL, and TCL?
What is primary key and foreign key? Difference between primary and unique key?
What is commit, rollback, and savepoint?
What is indexing? How do indexes improve performance?
What is a view? Difference between a view and a table?
What is a join? Explain types of joins.
What is GROUP BY? Difference between WHERE and HAVING?
What is UNION? UNION vs UNION ALL?
What is ORDER BY? What is DISTINCT? What is LIMIT?
What are aggregation functions?
Difference between DELETE, DROP, and TRUNCATE?
Difference between CHAR and VARCHAR?
What is a constraint? Explain in detail.
How do you improve SQL query performance?
What is SQL injection? How do you prevent SQL injection?

SQL Coding Questions:

Write a query to find the second highest salary.
Write a query to find average salary department-wise.
Write a query to find the nth highest salary.

Second Highest Salary:
======================

SELECT MAX(salary) AS SecondHighest
FROM employees
WHERE salary < (SELECT MAX(salary) FROM employees);

-- OR using LIMIT/OFFSET:

SELECT salary FROM employees
ORDER BY salary DESC
LIMIT 1 OFFSET 1;


Nth Highest Salary:
===================

SELECT salary FROM employees
ORDER BY salary DESC
LIMIT 1 OFFSET (N-1);

Advanced Database Questions:

When would you choose SQL over NoSQL?
What is normalization and denormalization?
What are ACID properties?
What is the CAP theorem?
Clustered index vs non-clustered index? Drawbacks of too many indexes?
What is query optimization? How do you optimize slow queries?
What is an execution plan? What is a full table scan?
What is connection pooling? Why does it improve performance?
What is database replication? Explain primary-replica architecture.
Read replicas vs primary database?
What is database sharding?
Horizontal partitioning vs vertical partitioning? What is partitioning?
What are transactions? What is a deadlock? How do you handle deadlocks?
What is the N+1 query problem?
What is an aggregation pipeline?
What is database migration? Why is it important?
What is caching in a database? Redis vs database caching?
What is distributed caching?
How do you scale databases? Vertical vs Horizontal scaling?
What causes slow database performance? How do you monitor it?
What is database failover? What is a backup and recovery strategy?
What are common database optimization techniques?
How do you design a DB for high-traffic systems?
How do you maintain data integrity in microservices?
SQL injection vs NoSQL injection? How do you secure databases in production?

ACID Properties:
================

A → Atomicity   - All or nothing. If one part fails,
                  entire transaction is rolled back.

C → Consistency - DB moves from one valid state
                  to another valid state.

I → Isolation   - Concurrent transactions don't
                  interfere with each other.

D → Durability  - Once committed, data persists
                  even after system crash.


CAP Theorem:
============

Only 2 of 3 can be guaranteed at a time:

       Consistency
            △
           /│\
          / │ \
         /  │  \
        /   │   \
       ▼    │    ▼
Availability─────Partition Tolerance

CA → Traditional RDBMS (MySQL, PostgreSQL)
CP → MongoDB, HBase
AP → Cassandra, CouchDB

07 — Cloud Infrastructure (AWS), Docker & Kubernetes

EC2, S3, RDS, VPC, containerization, orchestration, and cluster management.

AWS Questions:

What is AWS? What is cloud computing?
What is EC2? What is an EC2 instance?
What is S3? What is a bucket in S3? Why is S3 used?
How do you upload files to S3? Difference between public and private bucket?
What is RDS? Difference between RDS and an EC2-hosted DB?
What is a read replica in AWS RDS?
What is an AMI (Amazon Machine Image)?
What is a Security Group? What is an Elastic IP?
How do you connect to an EC2 instance using SSH?
What is a VPC? What is a subnet?
What is a NAT Gateway? What is an Internet Gateway?

Docker Questions:

What is Docker? Why is Docker used? What problem does Docker solve?
Difference between Docker and a Virtual Machine? What is containerization?
What is a Docker container? What is a Docker image? Difference between image and container?
What is Docker Engine? What is Docker Hub?
What is a Dockerfile? What are common Dockerfile instructions?
What is FROM, WORKDIR, EXPOSE, and ENV in a Dockerfile?
Difference between COPY and ADD? What is the RUN command?
Difference between RUN, CMD, and ENTRYPOINT?
What is a .dockerignore file?
How do you create a Docker image and run/stop a container?
What is port mapping in Docker?
What is a volume in Docker? Why are volumes needed?
How do containers communicate with each other?
What is docker-compose? Why is it used? Difference between Docker and docker-compose?
How do you dockerize a Node.js application? How do you dockerize a React application?
What is container orchestration? What happens if a container crashes?
How do you restart containers automatically? What is a health check in Docker?
What are environment variables and how do you pass secrets/configurations in Docker?
What are common Docker security best practices? Docker image optimization.
What is a Docker registry? Public vs private registry?
How do you push/pull images to/from Docker Hub?
What is the lifecycle of a Docker container?

Docker vs Virtual Machine:
==========================

Virtual Machine:              Docker Container:
────────────────              ─────────────────
┌─────────────────┐           ┌─────────────────┐
│   App A  App B  │           │   App A  App B  │
├────────┬────────┤           ├────────┬────────┤
│Guest OS│Guest OS│           │  Libs  │  Libs  │
├────────┴────────┤           ├─────────────────┤
│   Hypervisor    │           │  Docker Engine  │
├─────────────────┤           ├─────────────────┤
│    Host OS      │           │    Host OS      │
├─────────────────┤           ├─────────────────┤
│    Hardware     │           │    Hardware     │
└─────────────────┘           └─────────────────┘

Heavy (GBs), Slow boot        Lightweight (MBs), Fast start


Dockerfile for Node.js App:
============================

FROM node:18-alpine          ← Base image
WORKDIR /app                 ← Set working directory
COPY package*.json ./        ← Copy dependencies
RUN npm install              ← Install deps
COPY . .                     ← Copy source code
EXPOSE 3000                  ← Document port
CMD ["node", "server.js"]    ← Start command

Kubernetes Questions:

What is Kubernetes? Why is Kubernetes used? What problem does it solve?
Difference between Docker and Kubernetes?
What is a Kubernetes cluster? What are master/control plane and worker nodes?
What is a Pod? Why is it the smallest deployable unit? Can a Pod contain multiple containers?
What is a Deployment in Kubernetes? What is a ReplicaSet? Difference between Pod and Deployment?
What is a Service in Kubernetes? Explain the types of services.
What is a scheduler? What is a controller manager?
What happens when a pod crashes? How does Kubernetes handle self-healing?
What is a rolling update? What is a rollback in Kubernetes?
What is autoscaling? What is load balancing and service discovery in Kubernetes?
What is a persistent volume? Why is persistent storage needed?
Explain Kubernetes architecture briefly.

Kubernetes Architecture:
========================

           Control Plane (Master Node)
┌─────────────────────────────────────────┐
│  API Server  │  Scheduler  │  etcd      │
│  Controller Manager  │  Cloud Manager   │
└─────────────────────┬───────────────────┘
                      │
           ┌──────────┼──────────┐
           │          │          │
    Worker Node  Worker Node  Worker Node
    ┌─────────┐  ┌─────────┐  ┌─────────┐
    │ kubelet │  │ kubelet │  │ kubelet │
    │ kube-   │  │ kube-   │  │ kube-   │
    │  proxy  │  │  proxy  │  │  proxy  │
    │         │  │         │  │         │
    │ Pod Pod │  │ Pod Pod │  │ Pod Pod │
    └─────────┘  └─────────┘  └─────────┘


Kubernetes Service Types:
=========================

ClusterIP   → Internal cluster access only (default)
NodePort    → Exposes service on each node's IP
LoadBalancer→ External load balancer (cloud provider)
ExternalName→ Maps service to external DNS name

08 — CI/CD — GitHub Actions & Jenkins

Pipelines, workflows, runners, artifacts, secrets, and deployment automation.

What is CI/CD? What problems does it solve?
What is Continuous Integration, Continuous Delivery, and Continuous Deployment?
Difference between Continuous Delivery and Continuous Deployment?
What is a CI/CD pipeline? What are stages in a pipeline?
What happens in the Build, Testing, and Deployment stages?
What is automated testing in CI/CD? Why is it important?
What is build automation? What is deployment automation?
What is a rollback in deployment?
What is GitHub Actions? What is Jenkins? GitHub Actions vs Jenkins?
Why is GitHub Actions used? What problem does it solve?
What is CI/CD in GitHub Actions? What is a workflow?
Where are workflow files stored? Why are they written in YAML?
What is the .github/workflows directory?
What is a runner in GitHub Actions?
What are jobs and steps in GitHub Actions? Difference between them?
How are workflows triggered? How do you trigger workflows manually (workflow_dispatch)?
Explain your GitHub Actions pipeline configuration.
How does a workflow get triggered after a code push?
How do you optimize GitHub Actions pipelines?
What triggers a CI/CD pipeline? What is a webhook in CI/CD?
What is an artifact in CI/CD?
How do you securely store secrets in a CI/CD pipeline?
What is Docker's role in CI/CD? How does CI/CD work with Docker?
What is Infrastructure as Code (IaC)?
What are common CI/CD configuration challenges?

CI/CD Pipeline Stages:
======================

Code Push (git push)
       │
       ▼
┌─────────────────┐
│   1. BUILD      │  ← npm install, compile, docker build
└────────┬────────┘
         │
         ▼
┌─────────────────┐
│   2. TEST       │  ← Unit tests, integration tests, lint
└────────┬────────┘
         │
         ▼
┌─────────────────┐
│   3. SCAN       │  ← Security scan, code quality check
└────────┬────────┘
         │
         ▼
┌─────────────────┐
│   4. PACKAGE    │  ← Build Docker image, push to registry
└────────┬────────┘
         │
         ▼
┌─────────────────┐
│   5. DEPLOY     │  ← Deploy to staging / production
└────────┬────────┘
         │
         ▼
┌─────────────────┐
│   6. MONITOR    │  ← Health checks, alerts
└─────────────────┘


GitHub Actions Workflow Example:
=================================

name: CI/CD Pipeline

on:
  push:
    branches: [main]

jobs:
  build-and-deploy:
    runs-on: ubuntu-latest   ← Runner
    steps:
      - uses: actions/checkout@v3
      - run: npm install
      - run: npm test
      - run: docker build -t myapp .
      - run: docker push myapp

Feature	GitHub Actions	Jenkins
Hosting	Cloud (GitHub)	Self-hosted
Setup	Zero configuration	Complex setup required
Config	YAML in .github/workflows	Jenkinsfile (Groovy)
Runners	GitHub-hosted or self-hosted	Jenkins agents
Cost	Free for public repos	Free (self-hosted infra cost)
Best for	GitHub-based projects	Complex enterprise pipelines

Quick Recap

Topic	Key Concepts
JavaScript	Closures, Event Loop, Promises, Hoisting, ES6+
React.js	Hooks, Virtual DOM, Reconciliation, Fiber, SSR/CSR
Node.js	Event Loop Phases, Streams, Cluster, Worker Threads
NestJS	DI, Guards, Interceptors, Pipes, Request Lifecycle
Auth	JWT, OAuth, RBAC, bcrypt, Refresh Tokens
Microservices	Circuit Breaker, Saga, Message Queues, API Gateway
Databases	ACID, CAP, Indexing, Sharding, Replication, N+1
AWS	EC2, S3, RDS, VPC, Security Groups, NAT Gateway
Docker	Images, Containers, Volumes, docker-compose, Registry
Kubernetes	Pods, Deployments, Services, Self-healing, Autoscaling
CI/CD	Pipelines, GitHub Actions, Runners, Artifacts, Secrets

Key Points to Remember

JavaScript is single-threaded but handles async via the Event Loop
React Fiber enables concurrent rendering and prioritized updates
Node.js Event Loop has 6 phases — understand each phase's role
JWT is stateless; sessions are stateful — know when to use which
Microservices solve scalability but add operational complexity
ACID is for relational DBs; CAP theorem applies to distributed DBs
Docker containers share the host OS kernel — much lighter than VMs
Kubernetes handles self-healing, scaling, and rolling deployments automatically
CI/CD ensures code is always in a deployable state through automation
Use consistent types in functions to avoid V8 deoptimization

What's Next?

You now have a complete question bank covering the full stack! Here's how to use this guide:

Go through each section and try to answer every question out loud
Draw the architecture diagrams from memory
Practice the SQL queries hands-on
Build small projects using Docker, GitHub Actions, and AWS
Revisit weak areas and focus on diagram-based explanations

Good luck with your interviews! Keep coding, keep learning!

interview

Shreyash Kolhe

Complete Full-Stack & DevOps Interview Master Guide

Complete Full-Stack & DevOps Interview Master Guide

01 — JavaScript Fundamentals & Express.js

02 — React.js Frontend Architecture

03 — Node.js Runtime & NestJS Framework

04 — Authentication, Authorization & Security

05 — Microservices Architecture, Performance & Scalability

06 — Database Design, Operations & Internals

07 — Cloud Infrastructure (AWS), Docker & Kubernetes

08 — CI/CD — GitHub Actions & Jenkins

Quick Recap

Key Points to Remember

What's Next?

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