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Five new blogs every week on Agentic AI with LangChain, LangGraph, LangSmith, LangFlow and n8n, System Design, AWS & DevOps, Kubernetes & Docker, and Next.js & React.
Week of 2 Nov 2026
01 · Agentic AI - LangChain, LangGraph, LangSmith, LangFlow and n8nBuild a LangGraph travel planner that fans out flight, hotel and weather calls in parallel and pauses for human approval before payment.
02 · System DesignThe Feed Page That Kept Hitting Postgres: Cache-Aside, Write-Through and Pub/Sub Fixed It
03 · AWS & DevOpsThe Deploy That Rolled Itself Back Before Anyone Noticed the Bug
04 · Kubernetes & DockerWe Deleted a Custom Resource and the Operator Quietly Snapshot-Then-Nuked Our Volumes
05 · Next.js & ReactOne Slow Vendor API Was Blocking Our Entire Seller DashboardFrom earlier editions
Every edition's blogs move here when the next week's edition is published, and stay for later reading, sorted by technology.
Agentic AI - LangChain, LangGraph, LangSmith, LangFlow and n8nCan an Agent Remember You Hate Late Fees? Building a Bill Reminder BrainAWS & DevOpsThe Deploy That Rolled Itself Back Before Anyone Noticed the Bug
System DesignThe Replies That Arrived Before the Question: Fixing Chat Message Order
Kubernetes & DockerThe Deploy That Dropped Zero Requests, Until a Node Drained Mid-Rollout
Next.js 16 & React 19We Shipped a 480KB Moment Library to Render One Date on a Button
Agentic AI - LangChain, LangGraph, LangSmith, LangFlow and n8nHow a LangGraph Agent Reviews Every Pull Request Before a Human Even Opens It
System DesignThe Order That Shipped Twice: Fixing a Dual-Write Bug With Kafka and the Outbox Pattern
Kubernetes & DockerWe Had HPA, VPA, and Still Got Paged During the Diwali Sale Spike
Next.js 16 & React 19The Support Ticket Queue That Lied: Fixing Optimistic UI With React 19 Actions
AWS & DevOpsThe CDK Deploy That Quietly Deleted Our Order History Table at 2 AM
AWS & DevOpsThe HR Chatbot That Almost Leaked Salary Bands: Lessons from Bedrock Guardrails
Kubernetes & DockerOur 1.2GB Node Image Shipped a Shell, npm, and a CVE We Never Scanned For
System Design3 AM Page: Our URL Shortener's Database Melted Under a Billion Redirects
Next.js 16 & React 19Our Flash Sale Page Served Stale Prices to Everyone, Including the CEO
Agentic AI - LangChain, LangGraph, LangSmith, LangFlow and n8nThe Day a Refund Bot Nearly Approved a ₹48,000 Payout Alone
AWS & DevOpsWe Cut a ₹41 Lakh AWS Bill to ₹16 Lakh Without Losing a Single Feature
System DesignThe 40GB Wedding Video That Crashed Our Homegrown Transcoding Fleet
Next.js 16 & React 19The Lab Said 0.9s, Real Phones Said 4.8s: Fixing Core Web Vitals in Next.js 16
Kubernetes & DockerWe Ran docker compose bridge convert Two Days Before Launch. Here's What It Didn't Tell Us
Agentic AI & LangChainWhy Your RAG Bot Lies With a Straight Face, And How to Make It Check Itself
AWS & DevOpsAmazon Q Developer Debugged Our 3 AM ECS Outage Before My Coffee Finished Brewing
Next.js 16 & React 19Why Our Dashboard Took 4.2 Seconds To Paint, And How use() Fixed It
System DesignThe Celebrity Tweet That Broke Our Feed: Fan-out Explained
Kubernetes & DockerThe 3 AM Page That Taught Us Why StatefulSets Alone Don't Run DatabasesReader rated
Ranked by readers' stars, weighted by how many rated them.
Readers’ #15.001 ratingWhy Our Claude Code Agent Almost Ran rm -rf in CI (And How We Locked It Down)Claude Code · 27 Oct 2026 · 10 min read
5.001 ratingReasoning Models, MCP, and the Plumbing Behind AI Agents in 2026
5.001 ratingAgents API, Agents SDK, or Responses API: The One Decision That Breaks Production
5.001 ratingFive Agent Frameworks, Two We Can Actually Verify: A Documentation-First Comparison
5.001 ratingThe n8n Workflow That Paid Off: Triggers, Agents, Errors, and Queue ModeCommunity favourites
The topics engineers read most, from React and Next.js to Claude Code, OpenAI, Google and Microsoft AI. Pick a topic; readers' likes rank its stories.
#1 in the communityThe Support Ticket Queue That Lied: Fixing Optimistic UI With React 19 ActionsLearn to wire useActionState and useOptimistic so your forms feel instant without lying about server state.1 likeWhy Your RAG Bot Lies With a Straight Face, And How to Make It Check ItselfFive Agent Frameworks, Two We Can Actually Verify: A Documentation-First ComparisonWhy Our Next.js Dashboard Froze for 8 Seconds Until Cache Components Fixed ItOne Slow Vendor API Was Blocking Our Entire Seller DashboardThe Deploy That Rolled Itself Back Before Anyone Noticed the BugAutomation
Triggers, AI agent nodes and production workflows, step by step.
Browse by technology
Every blog lands in its technology's own section. Pick a technology, or browse them all.
LangChain, LangGraph, LangSmith, LangFlow, RAG and agents in production.
Agentic AINewThe Travel Agent That Almost Auto-Booked a ₹14,000 Trip Without Asking
Agentic AI4.5Senior full-stack review: 4.5 out of 5 starsThe ₹2 Lakh Refund Reply That Taught Us to Build a Confidence Gate in RAG
Agentic AI4.0Senior full-stack review: 4 out of 5 starsThe Agent That Signed Its Own Alibi: Hash-Chaining Proposal, Approval, Execution
Agentic AI3.5Senior full-stack review: 3.5 out of 5 starsYour Local Coding Agent Scores 77 on SWE-bench. Will It Survive Call Eleven?
Agentic AI3.5Senior full-stack review: 3.5 out of 5 starsWhy Your MCP Server Burns Tokens Before It Reads Your QuestionAgentic AI3.5Senior full-stack review: 3.5 out of 5 starsCan an Agent Remember You Hate Late Fees? Building a Bill Reminder Brainn8n workflows, triggers, AI nodes and self-hosting.
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Master autonomous multi-agent systems from prompt tools to stateful persistence and webhook automation.
Build zero-waterfall, compiler-optimized apps with Server Actions, Cache Components, and optimistic UI.
Scale from 10k to 10M requests with token bucket rate limiters, vector indexes, Redis, and event streams.
System Design · System DesignLearn to serve a news feed from Redis with cache-aside reads, write-through updates, Pub/Sub invalidation, and Top-K ranking.
MCB EditorialMCB EditorialAgentic AI - LangChain, LangGraph, LangSmith, LangFlow and n8nBuild a LangGraph travel planner that fans out flight, hotel and weather calls in parallel and pauses for human approval before payment.
MCB EditorialKubernetes & DockerLearn how to run databases on Kubernetes with operators without losing data to a reconciliation loop or a careless delete.
MCB EditorialNext.js 16 & React 19Learn to stream independent sections of a Next.js page with Suspense and use() so one slow call never blocks the rest.
MCB EditorialAgentic AI - LangChain, LangGraph, LangSmith, LangFlow and n8nLearn how n8n, a LangChain agent, LangGraph memory and LangSmith tracing combine to track bills without ever seeing your bank password twice.
MCB EditorialAWS & DevOpsLearn to wire CodePipeline, CodeDeploy, and ECS blue/green deploys so bad releases self-heal before users feel them.
MCB EditorialSystem DesignLearn to fan out chat messages over WebSockets while guaranteeing per-conversation order with Pub/Sub ordering keys.
MCB EditorialKubernetes & DockerLearn to combine readiness probes, PodDisruptionBudgets and rollout tuning so deploys and node maintenance never overlap into an outage.
MCB EditorialNext.js 16 & React 19Learn exactly which modules cross the server-client boundary in Next.js 16 so your bundles stop ballooning.
MCB EditorialAgentic AI - LangChain, LangGraph, LangSmith, LangFlow and n8nBuild an n8n-triggered LangGraph agent that reviews diffs, posts comments, and gets graded by LangSmith on every merge.
MCB EditorialSystem DesignLearn to build a production-grade order pipeline that never loses or duplicates an event, using the transactional outbox and Kafka idempotent producers.
MCB EditorialNext.js 16 & React 19Learn to wire useActionState and useOptimistic so your forms feel instant without lying about server state.
MCB EditorialKubernetes & DockerLearn when to reach for HPA, VPA, or event-driven scaling so your pods react to real traffic instead of average CPU.
Last updated
Tech Buzz is the weekly technology blog on MasterClass Buddy. It explains real engineering problems and how they were solved, with code, across Agentic AI, System Design, AWS and DevOps, Kubernetes and Docker, and Next.js and React. Developers rate each story.
Five new stories go live every Monday at 00:00 IST, one per track: Agentic AI, System Design, AWS and DevOps, Kubernetes and Docker, and Next.js and React. Each story shows the date it was published, and older stories stay available here.
Every story has a free preview that anyone can read, without an account. The full story is for members, whose membership also covers the courses, certification paths and practice tests in the dashboard, billed monthly or yearly.
