systemdr

Your cache just took down your database 👇 A hot key expires. 1,000 requests miss and all hit the DB at once. Fix 1: request coalescing (one rebuild, everyone else waits) Fix 2: jittered TTLs + early refresh #SystemDesign #Caching

Set up React + TypeScript + Vite the production-ready way 🎓 📘 Free System Design eBook:

RT @SystemDR1: Your RAG chatbot gives confident, wrong answers? Production RAG in 5 steps: 1. Overlapping chunks + source/page 2. Vector + keyword search in parallel 3. Merge, rerank, keep top 5 4. Answer only from context, cite it 5. Weak retrieval? Say "I don't know" #RAG #AIEngineering

Build a Node.js Express API from scratch in 8 lessons

🚀 A backend alone isn’t a product. Let’s bring it to life with React This week, we’re building the frontend integration layer: Custom API client & error handling 🔐 Complete authentication flow 🧩 Quiz management & quiz-taking UI 📊 Analytics dashboard 🔄 State management

Master PyTorch: tensors, autograd & training loops Free System Design eBook: Course:

PHP CVE-2026-109618: multipart → OOM → longjmp with half-built state → shutdown RCE. Patch: 8.2.35 / 8.3.36 / 8.4.27 / 8.5.12 👇 #PHP #AppSec

Azure Service Bus Tutorial with .NET: Queues, Topics, Backpressure & Dead-Letter Queues

Coding agent = while loop. Skills = process. MCP = tools. Worktrees = isolation. Without those three, two agents in one checkout go to war. #AIAgents #MCP

Build one yourself, full tutorial: More hands-on AI & system design:

Spin up PostgreSQL & hit your first psql prompt #SQL

three enterprise customers. one platform. zero isolation. that's how outages become breaches. we build tenant isolation + quotas + sso + billing — hands-on, day 106-110 of our system design course. website: #multitenant #systemdesign #saasarchitecture

Install Claude Code & ship your first AI edit in 3 hours. Reply: Course: [course link] | Free System Design eBook: [eBook link] #ClaudeCode

.NET Aspire Observability: Serilog, OpenTelemetry & Distributed Tracing Course Introduction: Complete Curriculum — 45 Posts:

Your KV store loses every key on restart. Fix it with a WAL

Visit our Website : Course Link : Curriculum: Hands On Kubernetes Course.

Debug Java microservices with Micrometer & OpenTelemetry 🎁 🎓

Build a 5-Agent RAG Pipeline: Hybrid Search, Reranking & Critic Agent Course overview: