Free Technical PDF Notes
& Study Guides
In-depth engineering notes, system design formulas, React 19 cheatsheets, and AI system blueprints. Read directly in your browser or download free offline copies with 1 click.
DSA Mastery & Algorithm Patterns Cheatsheet
450+ solved patterns, Blind 75 & NeetCode 150 visual breakdowns, dynamic programming decision trees, sliding windows, and graph traversal templates.
High-Scale System Design & Architecture Cheatsheet
Key formulas, capacity estimation rules of thumb, distributed caching, database sharding, message queues (Kafka, RabbitMQ), rate limiters, and idempotency keys.
Production Backend & Microservices Architecture
Designing resilient microservices, gRPC & REST APIs, Redis distributed caching, Kafka event streams, ACID transactions, and JWT authentication.
Next.js 16 & React 19 Architecture Handbook
A complete guide to React 19 Server Components, App Router deep dives, Server Actions, PPR (Partial Prerendering), Turbopack optimizations, and Vercel AI SDK integrations.
Generative AI, RAG & Multi-Agent Systems Field Manual
Deep dive into enterprise RAG architectures, chunking strategies, vector embeddings (Pinecone, pgvector), fine-tuning with LoRA, and LangGraph multi-agent orchestration.
Production Cloud & Kubernetes DevOps Playbook
Battle-tested runbook for Kubernetes microservices, Terraform infrastructure-as-code, Helm packaging, ArgoCD GitOps, and Prometheus observability.
Modern Design Systems: Figma Variables to React Code
Bridging the designer-developer gap. Figma variables, multi-brand token hierarchy, accessible contrast ratios (WCAG 2.2), Tailwind theme syncing, and Radix UI primitives.
Cross-Platform Mobile Pro: React Native & Expo Guide
Building 60fps native iOS and Android apps with Expo Router v4, React Native Reanimated 3, offline-first SQLite databases, and app store release pipelines.