DEV Community: Ravindra Singh Shah

Practice coding patterns - Choose a template and write it from memory.

Ravindra Singh Shah — Mon, 31 Aug 2026 17:00:30 +0000

Coding Pattern Playground | Free Interview Practice

Build coding interview patterns from memory and get instant, private TypeScript feedback—all free in your browser.

interviewprep.ravindrasinghshah.com

Tired of forgetting about common coding patterns and problem solving techniques? Then this one is for you. It's an amazing tool to practice and revise coding patterns, take quiz to see how much you remember about datastructures and algorithms, and even solve common problems using patterns.
Track you progress as you start your learning journey - and never to forget again patterns.

Goodluck and shoutout to those who wants to win by putting work!

DFS Isn't Magic — It's Just a Tree Doing What You Told It To

Ravindra Singh Shah — Mon, 31 Aug 2026 16:36:27 +0000

If you've stared at a binary tree problem, written dfs(root.left) and dfs(root.right) without really knowing why it works, this one's for you.

DFS Isn't Magic — It's Just a Tree Doing What You Told It To

If you've stared at a binary tree problem, written dfs(root.left) and dfs(root.right) without really knowing why it works, this one's for you.

ravindrasinghshah.substack.com

How I Think About Breadth-First Search (So the Queue Actually Makes Sense)

Ravindra Singh Shah — Thu, 06 Aug 2026 23:39:25 +0000

If you’ve memorized the BFS template but freeze the moment a problem doesn’t scream “level order,” this one’s for you.

How I Think About Breadth-First Search (So the Queue Actually Makes Sense)

If you’ve memorized the BFS template but freeze the moment a problem doesn’t scream “level order,” this one’s for you.

ravindrasinghshah.substack.com

What's your experience?

Ravindra Singh Shah — Sun, 26 Apr 2026 06:27:00 +0000

Everyone said Claude Code was the serious engineer's tool. My experience told a different story. Honest take from hands-on experience 👇
Full article

How to start building production grade GenAI Chatbot

Ravindra Singh Shah — Sun, 29 Mar 2026 08:07:48 +0000

Building Real Chatbots: Beyond LLM Demos | Ravindra Singh Shah posted on the topic | LinkedIn

Most GenAI chatbot tutorials stop at “call an LLM get an answer.” That’s fine… until you try to build something real. While some people turn this gap into multi-hour courses and “exclusive” webinars, I figured I’d just share it openly—because this stuff shouldn’t need a paywall 🤷‍♂️ I wrote a free article that takes a practical, production-inspired approach—based on how I’ve built systems in real-world environments—going beyond demos to something that actually resembles production systems. It covers: ⭐ How retrieval changes everything (and why your chatbot might be hallucinating) ⭐ Designing with auth, streaming, and guardrails from day one ⭐ Why data sanitization is more important than model choice ⭐ How to structure your code so you can swap vector DBs (HNSWLib → OpenSearch/Chroma) ⭐ How to evaluate quality using LLM-as-a-judge and other testing strategies The repo is open-source, so you can fork it and build your own version. 👉 Full article: https://lnkd.in/gf2GJATb 👉 Repo: https://lnkd.in/gW4jEGQX If you’re moving from “toy chatbot” → “real system,” this should give you a solid starting point. #genai #rag #chatbot #vectordatabase #aisolutions

linkedin.com

Most GenAI chatbot tutorials stop at “call an LLM get an answer.”

Ravindra Singh Shah — Wed, 25 Mar 2026 06:14:03 +0000

That’s fine… until you try to build something real.

While some people turn this gap into multi-hour courses and “exclusive” webinars, I figured I’d just share it openly—because this stuff shouldn’t need a paywall.

I wrote a free article that takes a practical, production-inspired approach—based on how I’ve built systems in real-world environments—going beyond demos to something that actually resembles production systems.

It covers:

How retrieval changes everything (and why your chatbot might be hallucinating)
Designing with auth, streaming, and guardrails from day one
Why data sanitization is more important than model choice
How to structure your code so you can swap vector DBs (HNSWLib → OpenSearch/Chroma)

The repo is open-source, so you can fork it and build your own version.

👉 Full article: Building a Realistic GenAI Chatbot: A Practical RAG Starter

👉 Repo:
https://github.com/ravindrasinghshah/genai-chatbot

If you’re moving from “toy chatbot” → “real system,” this should give you a solid starting point.

Curious how others here are approaching retrieval + evaluation in their RAG setups.

Why Tailwind CSS Still Needs Design Tokens (Especially in the Age of AI)

Ravindra Singh Shah — Thu, 19 Feb 2026 17:52:02 +0000

Tailwind CSS has changed how we build UIs. It’s fast, expressive, and removes a lot of traditional CSS pain. Add AI coding tools into the mix, and frontend velocity is higher than ever.

But once a codebase grows, many teams hit the same realization:

Tailwind alone is not a design system.

This is where design tokens come in — not as a replacement for Tailwind, but as the missing foundation beneath it.

A Practical Reference Implementation
I built a token-first design system using:

Design tokens as the source of truth
Tailwind CSS as the utility layer
React components consuming semantic classes
Storybook for documentation

If you’re interested in how this works in practice, I’ve written a full deep-dive here 👇
👉 Full article on Substack — Building a Token-Driven Design System for Tailwind & AI

GitHub repo for reference:
👉 https://github.com/ravindrasinghshah/design-system

How Netflix, Airbnb & Amazon Prime Actually Use AWS S3?

Ravindra Singh Shah — Fri, 13 Feb 2026 18:21:42 +0000

Most developers think of Amazon S3 as “just object storage.”

But companies like Netflix, Amazon Prime Video, and Airbnb use Amazon Web Services S3 in far more strategic ways than simple file storage.

We’re talking about:

Petabyte-scale video pipelines
Global content distribution workflows
Data lakes powering personalization
Image storage optimized for performance and cost
Backup + disaster recovery at planetary scale

S3 isn’t just storage. It’s infrastructure.

If you're building anything at scale — SaaS, streaming, marketplaces, analytics-heavy apps — understanding how S3 is used in production environments can change how you architect your system.

I broke down the real-world use cases, architectural patterns, and practical lessons in detail here:

👉 Full breakdown: Amazon S3 Explained: The Cloud Storage Service You’ll End Up Using Everywhere!

Understanding AWS Lambda: Invocations, Events and How It Really Works

Ravindra Singh Shah — Wed, 04 Feb 2026 16:09:28 +0000

AWS Lambda is often described as “run code without servers” — but the real power (and confusion) lies in how Lambda is invoked.

There are three core invocation models every developer should understand:

Synchronous invocations — request/response style, commonly used with API Gateway
Asynchronous invocations — event-driven, retried automatically, great for background jobs
Event source mappings — Lambda polls services like SQS, DynamoDB Streams, and Kinesis

Each model has very different behavior when it comes to retries, error handling, concurrency, and cost.

Once you understand:

how Lambda scales,
when cold starts happen,
and how retries actually work,

you stop treating Lambda as “magic” and start designing simpler, more resilient systems.

👉 I wrote a detailed breakdown here (with real-world context, not just docs):
Read the full article: here

EC2 vs Containers vs Lambda: How I Think About AWS Compute (and How You Should Too)

Ravindra Singh Shah — Sun, 18 Jan 2026 20:02:55 +0000

One of the first confusing things about AWS is realizing there are multiple ways to run your code.

EC2, Lambda, containers (ECS/EKS)… they all “run applications,” but they come with very different trade-offs. If you’ve ever wondered why AWS offers so many options—or when to use which—this quick mental model might help.

EC2 is closest to a traditional server. You get full control, but you also own scaling, patching, and uptime (usually via Auto Scaling).

Containers sit in the middle. You package your app once and run it consistently across environments, letting AWS handle a lot of the orchestration.

Lambda removes servers entirely from your mental model. You write functions, AWS runs them on demand, and you pay only for execution time.

There’s no single “best” option. Most real-world systems use a mix of all three depending on the workload.

I wrote a detailed, beginner-friendly breakdown explaining how I think about these choices in practice—without turning it into documentation.

👉 Read the full article here:
EC2 vs Lambda vs Containers: How I Think About AWS Compute
https://ravindrasinghshah.substack.com/p/ec2-vs-containers-vs-lambda-how-i

Master Microservice Architecture on AWS: A Practical Guide for Junior Engineers

Ravindra Singh Shah — Tue, 06 Jan 2026 16:33:55 +0000

Struggling with Microservices on AWS?

Felt overwhelmed by Kubernetes, EKS, Docker, Helm, and CI/CD pipelines? You're not alone. Many junior and mid-level engineers find the microservices ecosystem intimidating because all these tools seem disconnected.

But here's the thing: the tools themselves aren't complex. The real challenge is understanding why they exist and how they fit together.

Read This Deep Dive

An excellent comprehensive guide: "Microservice Architecture on AWS: A Practical Introduction for Junior Engineers"

This article walks you through:

✅ From Monoliths to Microservices - Why you'd split a system into independent services

✅ Why Containers Matter - How Docker solves the "it works on my machine" problem

✅ Kubernetes Fundamentals - How it manages desired state and keeps your services running

✅ AWS EKS Explained - Why it's the practical way to run Kubernetes on AWS

✅ Helm for Deployments - How teams package and deploy services consistently

✅ CI/CD Automation - Building and deploying with GitHub Actions and AWS ECR

✅ Ingress & Routing - Using NGINX to expose services safely

✅ Secrets Management - Storing sensitive data securely in AWS Secrets Manager

What Makes This Guide Stand Out

Instead of treating each tool as an isolated concept, this article explains how responsibilities are divided across tools. You learn not just the "what" but the "why" - critical for developing the mental model that makes everything click.

Perfect for:

Junior engineers preparing for microservices roles
Mid-level engineers transitioning to AWS/Kubernetes
Anyone who feels confused by the microservices toolchain
Teams evaluating whether to adopt this architecture

Ready to Understand Your Stack?

Head over to the full article for detailed explanations, practical examples, and references to deepen your knowledge.

Have you recently learned about microservices? Share your biggest "aha!" moment in the comments! 👇

📖 Read the full guide on Substack

aws #kubernetes #docker #microservices #devops #backend