Aksh Patel

System Design Series - Day 14/30 Your API just got featured on TechCrunch. 10,000 requests per second suddenly hit your server. Your database crashes. Your app goes down. You lose $50K in sales in a single hour. This could have been prevented with one thing: an API Gateway. Think of an API Gateway as the bouncer standing in front of your backend. Before API Gateway: Users directly hit your backend servers for every request. After API Gateway: Users → API Gateway → Backend servers The gateway filters bad traffic, handles rate limiting, authentication, and routing before anything reaches your actual servers. Real Black Friday Example: Without Gateway: - 15,000 requests per second hit the servers - 12,000 were bots, scrapers and abusers - Only 3,000 were real users - Servers ran at 95% CPU - Final bill: $8,000 in overages With Gateway: - 15,000 requests hit the gateway - 12,000 malicious requests blocked instantly - Only 3,000 reached the backend - Servers stayed at 35% CPU - Total cost: $1,200 What a good API Gateway actually does: • Rate limiting (stops abuse) • Request validation (rejects malformed requests instantly) • Centralized authentication (JWT, API keys) • Caching for repeated requests • Intelligent routing and load balancing • DDoS protection Popular options: - Kong (open-source and powerful) - AWS API Gateway (serverless, auto-scales) - Nginx (lightweight and customizable) - Cloudflare (excellent free tier + DDoS protection) Bottom line: If your API is public-facing, an API Gateway is not optional. It is basic infrastructure. Stop letting every bot and abuser hit your backend directly. Tomorrow: Rate Limiting strategies that actually work. Have you implemented an API Gateway yet? Or are you still exposing your backend servers directly? Drop your current setup below.

@isha_singh06 both

Are you using which one? - Android - Iphone

Day 1 of my Mobile Dev Cohort 🚀 Got introduced to the React and React Native ecosystem for mobile development today. It’s exciting to see how powerful and flexible these tools are for building cross-platform apps. Looking forward to diving deeper and building some apps! 📱💻

@nirudhuuu @sharmadipalidev uno reverse 😂

@sharmadipalidev B for Bigg Boss

B for Backend, B for Backlog 💀

@Hiteshdotcom ese meh mera ghre chala jayega sir..😂😂

You can just order it on Amazon 🙄

@anjany06 b

Let’s end the debate.... Which YouTuber cohort is actually best for development? a) Harkirat Singh b) Chai aur code c) Apna College d) Shreyians Coding School

System Design Series - Day 8/30 API Gateway Patterns – The Front Door of Your Microservices API Gateway is the single entry point for all your clients. Without it: - Mobile/web clients call 10+ different services directly - Authentication is duplicated everywhere - Rate limiting, CORS, logging → repeated in every service - Services are fully exposed to the internet With it: - One clean URL for clients - Centralized auth, rate limiting, routing, aggregation - Backend services stay hidden and secure Here’s everything you need to know about API Gateway patterns. What is an API Gateway? Think of it as the hotel front desk Without a front desk: - Guests wander around looking for rooms - No security check - Housekeeping and room service have no coordination With a front desk: - Single check-in point - Routes guests to correct room - Handles security, coordination, and requests API Gateway does exactly that for your microservices. The Problem It Solves Before API Gateway: Mobile app needs user profile + orders: → Calls User Service directly → Calls Order Service directly → Calls Payment Service directly Problems: - Client knows internal service URLs - Multiple network calls (slow on mobile) - Auth tokens sent to every service - No centralized rate limiting or logging - Services exposed to the internet After API Gateway: Mobile app calls one URL: https://api.example. com/profile Gateway handles everything internally: - Authenticates once - Routes and aggregates calls - Returns combined response Benefits: - 1 network call from client - Services completely hidden (security win) - Centralized cross-cutting concerns - Much better client experience Core Responsibilities: 1. Routing Maps external URLs to internal services GET /api/users → User Service GET /api/orders → Order Service 2. Authentication & Authorization Validates JWT/OAuth once at the gateway. Services trust the gateway. 3. Rate Limiting Prevents abuse (e.g., 100 requests/min per user). 4. Request Aggregation Combines multiple backend calls into one response for the client. 5. Protocol Translation Client uses REST → Service uses gRPC (handled at gateway). Advanced Patterns - Circuit Breaker → Prevents cascading failures when a service is down - Request/Response Transformation → Convert old → new API formats - Caching → Cache frequent responses at the gateway level - Logging & Monitoring → Centralized observability When to Use API Gateway Use it when: - You have multiple microservices - External clients (mobile, web, third-party) - You need centralized auth, rate limiting, or aggregation Don’t use it when: - Simple monolith (overkill) - Only internal service-to-service communication - Ultra-low latency is critical (extra hop) Popular Solutions - Kong (open-source, powerful plugins) - AWS API Gateway (managed, serverless) - NGINX + Lua (DIY, lightweight) - Traefik, Envoy, KrakenD Summary API Gateway is not just a proxy. It is the security layer, traffic manager, and aggregator for your entire backend. It simplifies client code, hides internal complexity, and centralizes cross-cutting concerns. Trade-offs: - Extra network hop (adds latency) - Becomes a critical component (make it highly available) Used correctly, it’s one of the most valuable pieces in any microservices architecture. Tomorrow (Day 9): Inter-Service Communication Patterns Questions about API Gateway? Drop them below 👇 #SystemDesign #APIGateway #Microservices #Backend

@nirudhuuu The use of leftside earbuds is more.

who will explain me this?

@surajtwt_ Decipline 💪

Linux is free Docker is free Kubernetes is free Git is free GitHub is free Python is free Node.js is free Go is free PostgreSQL is free MySQL is free MongoDB is free Redis is free Terraform is free Ansible is free Jenkins is free Prometheus is free Grafana is free NGINX is free Apache is free VS Code is free Postman is free Figma is free Vercel is free Netlify is free Azure is free tier ChatGPT is free Claude is free Gemini is free Perplexity is free What’s stopping you to build and ship?

@isha_singh06 SDE@home

As a developer, same salary, same location What would you choose ? 1. SDE @ Hotstar 2. SDE @ Oracle 3. SDE @ Goldman Sachs 4. SDE @ Zomato

Designed a database that handles both unique thrift items & multi-stock handmade products 🧠 Focused on real business logic, not just tables. Link of design: app.eraser.io/workspace/ahf5… From DMs → Orders → Payments → Delivery ✔️ #DBDesign @ChaiCodeHQ @Hiteshdotcom @nirudhuuu

@kaaaash____ Here ,@ChaiCodeHQ

Be honest, Which one is the best learning platform among these?

@Akshat_Tiwari12 @rohit_negi9 @CoderArmy Nice, Do one thing deploy on your portfolio so that every body seen it , also I recommend you purchase your own domain name and roll out your portfolio.

Finally, the wait is over 🚀 Built my first project — Portfolio Website 💻 :devportfolioproject.netlify.app Used all the concepts I’ve learned so far . Just the beginning — more to come! Feedback is welcome 🙌 #WebDevelopment #Portfolio #FirstProject #LearningInPublic #Buildinpublic

Late night grind → real progress 🚀 Yesterday: Learned Auth with TypeScript + Drizzle ORM Today: Tested, fixed bugs, and improved system ✅ ✔️ Access & Refresh Tokens ✔️ Clean DTOs ✔️ DRY code ✔️ End-to-end testing Up till 1:45 AM… worth it. That's the real engineering

@Saanvi_dhillon I' m also a student of chaicode webdev cohort 2026 💪👍 follow to our webdev journey @ChaiCodeHQ

If you're a 1st or 2nd year CSE student and really want to crack placements You’ll find many YouTube channels, but most focus on selling paid courses rather than teaching properly. I’ve tried those courses too, not worth it. If you truly want to learn DSA & Web Dev, these two channels are more than enough. Experienced student can share their review about these two legends

Class 32:- Auth with TS and SQL(Drizzle & postgres Topic covered: - 1)Auth with TS 2)Postgres 3)ORM (Object Relational Mapping) 4)Drizzle 5)Authentication and Authorization routes @Hiteshdotcom @piyushgarg_dev @nirudhuuu @surajtwt_ #ChaiDrizzle #chaicode #chaicohort

Lets make postgres db trending again this time. Join now.. @ChaiCodeHQ @Hiteshdotcom @piyushgarg_dev @BlazeisCoding

@isha_singh06 Space between two string

I'm a backend dev, scare me with one word.

Cohort class-31 : Auth class Topic covered :- 1.bearer 2cookie tokens handling 3.mail service 4.verify mail service 5.bcrypt hashing Thanks to @Hiteshdotcom @piyushgarg_dev @nirudhuuu @yntpdotme @wjshubham @ChaiCodeHQ Go tread with :- #ChaiAuthProMax

@Hiteshdotcom You're right sir cohort is unfair .. 🤣 YouTube live on @ChaiCodeHQ with @surajtwt_ @nirudhuuu @piyushgarg_dev @yntpdotme @BlazeisCoding