Programming Tutorials & AI Agents Guides

193 practical tutorials with working code — Python, JavaScript, Java, DevOps, and more

New Series 6 Parts

AI Agents Mastery: Zero to Production

The complete guide to building AI agents in 2025. From scratch implementation to multi-agent systems and production deployment with LangGraph, CrewAI & Ollama.

#ai-agents #langgraph #crewai #ollama #python

Part 1

Fundamentals: Build from Scratch

Beginner

Part 2

LangGraph: State Machines for AI

Intermediate

Part 3

Local LLMs with Ollama

Production Deployment

Advanced

Start Learning View all AI Agents posts →

New Series 8 Parts

API Design Mastery: HTTP to Production

Master API design from fundamentals to senior-level production systems. REST, security, caching, GraphQL, gRPC, resilience patterns, and real interview preparation.

#api #system-design #rest #graphql #interviews

Part 1

HTTP & REST Fundamentals

Beginner

Part 2

Security & Authentication

Beginner

Part 3

Rate Limiting & Pagination

Intermediate

Part 4

Versioning & Idempotency

Resilience & Observability

Start Learning View Series Hub →

All (193) System Design (15) JavaScript (31) Spring Boot (29) DevOps (27) Python (62) Java (28) Go (1)

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2025 2020 2019

System Design 7 min read

API Design Part 5: Caching Strategies

Master multi-layer caching architecture, HTTP cache headers, ETags, and cache invalidation patterns. Build fast, scalable APIs with proper caching.

#api #caching #performance +3 more

Dec 27, 2025 Read more

System Design 9 min read

API Design Part 6: GraphQL & gRPC

Master modern API protocols beyond REST. Learn when to use GraphQL for flexible queries, gRPC for high-performance microservices, and how to implement both in production.

#api #graphql #grpc +3 more

Dec 27, 2025 Read more

System Design 9 min read

API Design Part 1: HTTP & REST Fundamentals

Master HTTP methods, status codes, and REST principles. Build robust APIs with proper GET/POST semantics, idempotency, and correct status code selection.

#api #system-design #rest +3 more

Dec 27, 2025 Read more

System Design 10 min read

API Design Part 7: Resilience & Observability

Master circuit breakers, retry patterns, and the three pillars of observability. Build fault-tolerant APIs with proper metrics, logging, and distributed tracing.

#api #resilience #circuit-breaker +3 more

Dec 27, 2025 Read more

System Design 9 min read

API Design Part 2: Security & Authentication

Master API security layers, JWT implementation, OAuth 2.0 flows with PKCE. Production-grade patterns for authentication and authorization in modern APIs.

#api #security #jwt +3 more

Dec 27, 2025 Read more

System Design 9 min read

API Design Part 4: Versioning & Idempotency

Master API versioning and idempotency patterns. Compare URL vs header versioning, implement idempotency keys, and maintain backward compatibility in production APIs.

#api #versioning #idempotency +3 more

Dec 27, 2025 Read more

System Design 4 min read

API Design Mastery: Complete 8-Part Series

Master complete API design from fundamentals to production. Learn REST, GraphQL, gRPC, caching strategies, security, and resilience patterns for senior engineers.

#api #system-design #rest +3 more

Dec 27, 2025 Read more

System Design 10 min read

API Design Part 3: Rate Limiting & Pagination

Master rate limiting algorithms, production Redis implementations, and cursor pagination. Protect your API from abuse while efficiently serving large datasets.

#api #rate-limiting #pagination +3 more

Dec 27, 2025 Read more

System Design 14 min read

API Design Part 8: Production Mastery

Master real interview questions, production debugging, multi-tenancy, streaming, cost-aware design, and API governance. Complete your journey to senior API engineer.

#api #interviews #debugging +3 more

Dec 27, 2025 Read more

System Design 11 min read

CAP Theorem Explained: The Distributed Systems Trade-Off Every Engineer Must Know

Master the CAP theorem for system design. Understand Consistency, Availability, Partition tolerance trade-offs with real databases and interview-ready examples.

#system-design #distributed-systems #databases +3 more

Dec 27, 2025 Read more

JavaScript 17 min read

Turborepo Advanced Patterns: Production-Ready Monorepo Architecture in 2025

Master production Turborepo patterns with real-world examples. Migration guide, CI/CD pipelines, remote caching, testing strategies, and framework-specific configs.

#turborepo #monorepo #devops +4 more

Dec 19, 2025 Read more

Spring Boot 23 min read

Spring Boot 3 Virtual Threads: Complete Guide to Java 21 Concurrency

Master Java 21 virtual threads in Spring Boot. Learn configuration, benchmarks, pitfalls, and scale from thousands to millions of concurrent operations reliably.

#spring-boot #java #virtual-threads +4 more

Dec 13, 2025 Read more

Programming Tutorials & AI Agents Guides

AI Agents Mastery: Zero to Production

API Design Mastery: HTTP to Production

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API Design Part 5: Caching Strategies

API Design Part 6: GraphQL & gRPC

API Design Part 1: HTTP & REST Fundamentals

API Design Part 7: Resilience & Observability

API Design Part 2: Security & Authentication

API Design Part 4: Versioning & Idempotency

API Design Mastery: Complete 8-Part Series

API Design Part 3: Rate Limiting & Pagination

API Design Part 8: Production Mastery

CAP Theorem Explained: The Distributed Systems Trade-Off Every Engineer Must Know

Turborepo Advanced Patterns: Production-Ready Monorepo Architecture in 2025

Spring Boot 3 Virtual Threads: Complete Guide to Java 21 Concurrency