Archives

2026  43

August  1

RAG Evaluation Metrics Cheat Sheet

August 1, 2026 · 9 min · 1894 words · Andy SI

July  14

How to Rerank RAG Retrieval Results: From Hybrid Retrieval to Cross-Encoders, Listwise Ranking, and Evidence-Set Selection

July 29, 2026 · 37 min · 7834 words · Andy SI

2026 AI Application Engineer Job-Market Tech Stack: A Deep JD Study of Tokyo, Mainland China, and the US

July 28, 2026 · 28 min · 5931 words · Andy SI

From Single-Agent to Multi-Agent: A Guide to Robust Sub-Agent System Design

July 27, 2026 · 66 min · 13852 words · Andy SI

Context Compression for Production AI Agents: From Message Trimming and Tool-Result Cleanup to Hermes Agent’s Layered Compaction

July 26, 2026 · 17 min · 3452 words · Andy SI

Gradient Descent: How Large Language Models Learn to Generate Text from Random Guesses

July 26, 2026 · 15 min · 3174 words · Andy SI

Which Diagrams Should You Draw Before Coding Starts?

July 18, 2026 · 2 min · 349 words · Andy SI

Python Event Loop Fundamentals

July 18, 2026 · 14 min · 2973 words · Andy SI

RAG Retrieval Engineering: From Hybrid Retrieval to Production Governance

July 17, 2026 · 27 min · 5679 words · Andy SI

Designing Observability and Evaluation for RAG Systems

July 17, 2026 · 12 min · 2397 words · Andy SI

OpenTelemetry for AI Applications and AI Agents: A Beginner’s Guide

July 16, 2026 · 20 min · 4176 words · Andy SI

Best Practices for Chunking in RAG Systems

July 15, 2026 · 14 min · 2805 words · Andy SI

The Role of RRF in RAG: A Simple but Not Universal Retrieval-Fusion Method

July 15, 2026 · 9 min · 1908 words · Andy SI

Dense + Sparse Hybrid Search in RAG

July 15, 2026 · 8 min · 1571 words · Andy SI

A Guide to Building Enterprise RAG Systems

July 15, 2026 · 8 min · 1523 words · Andy SI

May  6

Making Deep Research Pluggable: What NVIDIA AI-Q Skills Teach Us About Enterprise Agent Architecture

May 25, 2026 · 15 min · 3161 words · Andy SI

What Did Tencent AI Leader Shunyu Yao Discuss in This Podcast?

May 24, 2026 · 15 min · 2983 words · Andy SI

What AI Engineers Should Learn in 2026

May 3, 2026 · 18 min · 3701 words · Andy SI

Put the Most Important Work Where Your Body Performs Best: My Manual for Improving My Schedule and Using Time Well

May 3, 2026 · 16 min · 3245 words · Andy SI

How to Design an Excellent AI Agent: From Architectural Principles to Practical Patterns

May 2, 2026 · 20 min · 4066 words · Andy SI

When an LLM’s Inner State and Its Words Diverge: A Master Key to Understanding LLM Behavior

May 2, 2026 · 16 min · 3265 words · Andy SI

April  2

A Core Skill in the Age of AI Coding Agents: Writing Effective Software Specs

April 9, 2026 · 19 min · 3891 words · Andy SI

The Full Landscape of LLM Training: What Every AI Application Engineer Should Understand

April 4, 2026 · 32 min · 6654 words · Andy SI

March  19

Agent-Native Documentation Engineering: Designing Documentation for AI Coding Agent-Driven Development

March 29, 2026 · 16 min · 3304 words · Andy SI

How to Write Documentation for an AI Coding Agent

March 28, 2026 · 12 min · 2510 words · Andy SI

The Agentic Evolution of LLMs: From Answering Questions to Working Autonomously

March 28, 2026 · 9 min · 1850 words · Andy SI

The Full Landscape of AI Agent Industry Standards: A Java Engineer’s Perspective

March 28, 2026 · 14 min · 2849 words · Andy SI

The Complete RAG Systems Guide: From Zero to Production

March 27, 2026 · 16 min · 3237 words · Andy SI

Entropy in LLMs: A Unifying Language from Training to Inference and Products

March 27, 2026 · 6 min · 1263 words · Andy SI

Spec-Driven Development Explained: From Prompt and Pray to Spec and Steer

March 19, 2026 · 12 min · 2443 words · Andy SI

RAG Chunking Best-Practices Guide

March 18, 2026 · 10 min · 2050 words · Andy SI

Agent = Model + Harness

March 18, 2026 · 6 min · 1167 words · Andy SI

The Complete Guide to Concurrency and Parallelism in Python: The Evolution from One Thread to Multiple Cores

March 15, 2026 · 18 min · 3774 words · Andy SI

Python Async Programming: A Complete Guide from Iteration Protocols to Coroutines, Tasks, and Thread Pools

March 15, 2026 · 25 min · 5122 words · Andy SI

The Complete Best-Practices Guide to Prompt Engineering

March 11, 2026 · 19 min · 4045 words · Andy SI

Notes on Anthropic’s Contextual Retrieval

March 11, 2026 · 5 min · 994 words · Andy SI

Essential Reading for Contextual Retrieval and RAG

March 9, 2026 · 4 min · 801 words · Andy SI

Apple M5 vs. M4: A Practical Comparison for AI Engineers

March 6, 2026 · 13 min · 2757 words · Andy SI

What Is an LLM API KV Cache?

March 5, 2026 · 17 min · 3558 words · Andy SI

The Complete Guide to LLM Chain-of-Thought (CoT)

March 4, 2026 · 12 min · 2430 words · Andy SI

Prompt Engineering: From Principles to Practice

March 3, 2026 · 20 min · 4215 words · Andy SI

Prompt Injection

March 3, 2026 · 11 min · 2278 words · Andy SI

February  1

Understanding the Mathematical Intuition Behind Transformers

February 24, 2026 · 18 min · 3726 words · Andy SI