Writing

Notes on engineering, AI and business, and experiments in building independent software products.

AI & Business

How Should You Choose a Partner for AI Workflow Improvement? 7 Criteria

A practical guide to comparing AI workflow improvement partners across seven areas: workflow analysis, PoC design, implementation, evaluation, security, human review, and portability.

Sep 16, 2026

AI & Business

In the AI Era, the Strong Company Is the One That Doesn't Hire — Doubling Revenue Without Doubling Headcount

The assumption that growing revenue means growing headcount breaks down under AI. AI amplifies not only productivity but the blast radius of mistakes, which is exactly why a company designed as "10 people + AI + strong permission control + automated workflows" is worth building.

Sep 5, 2026

Engineering

Clean Architecture Revisited — Read the Principles, Not the Circles

Every time the debate flares up, the concentric-circle diagram takes over. Re-reading the book's actual claims — a set of principles for keeping software soft — against the development environment of 2026.

Aug 31, 2026

Engineering

Are DDD and Clean Architecture Costing You the Strengths of Your RDB?

When strict aggregate boundaries and repository abstractions turn a problem one JOIN could solve into a CQRS project. On the order in which design techniques should be applied.

Aug 31, 2026

Engineering

Practical RAG Guide, Part 8: Production RAG — Turning a Demo into a System

Infrastructure as code with Terraform, observability, prompt versioning, evaluation in CI, and cost/latency monitoring. The series finale.

Aug 30, 2026

Engineering

Practical RAG Guide, Part 7: Advanced RAG — Designs That Don't Stop at One Search

Query rewriting, HyDE, context compression, Self-RAG, Corrective RAG, and Agentic RAG — RAG architectures with loops.

Aug 23, 2026

Engineering

Practical RAG Guide, Part 6: RAG Evaluation — Decomposing Quality into Retrieval and Generation

Build a 50–100 question golden dataset, measure Precision@K / Recall@K / MRR / NDCG and faithfulness, and make RAG quality diagnosable.

Aug 16, 2026

Engineering

What Is a Golden Dataset?

Why continuously evaluating LLM and RAG quality requires a "golden dataset" of correct answers.

Aug 10, 2026

Engineering

Practical RAG Guide, Part 5: Reranking — Retriever for Recall, Reranker for Precision

From the bi-encoder/cross-encoder distinction to a two-stage design that narrows Top 50 to Top 5, including the latency trade-off.

Aug 9, 2026

Engineering

Practical RAG Guide, Part 4: Serious Retrieval — Dense, BM25, and Hybrid Search

Reproduce dense retrieval's failures on product codes and proper nouns, then fix them with BM25 and hybrid search fused by RRF.

Aug 2, 2026

Engineering

Practical RAG Guide, Part 3: Chunking — How You Split Documents Decides Retrieval Quality

Fixed-size, recursive, semantic, and parent-child chunking strategies, plus a chunk size experiment at 200/500/1000.

Jul 26, 2026

Engineering

Practical RAG Guide, Part 2: Embeddings and Vector Search — Replacing "Seems Better" with Recall@5

The theory of embedding spaces, distance metrics, ANN, and HNSW — plus an experiment comparing three embedding models with Recall@K.

Jul 19, 2026

Engineering

The Practical RAG Guide — From "Can Build It" to "Can Diagnose and Improve It"

A roadmap for the eight-part series covering RAG fundamentals, chunking, hybrid search, reranking, evaluation, and production operations.

Jul 12, 2026

Engineering

Practical RAG Guide, Part 1: RAG Fundamentals — Why Retrieval Reduces Hallucination

From knowledge cutoffs and in-context learning to why RAG works at all. Build a minimal RAG pipeline without relying on frameworks.

Jul 12, 2026

Experiments

Building and Launching Small Manufacturer Hub

A launch log for a service combining free calculators, SaaS comparisons, and affiliate monetization.

Jul 1, 2026

AI & Business

AI Expands What One Engineer Can Do

Notes from the transition between client engineering and operating several small AI-enabled businesses independently.

Jun 15, 2026

Engineering

Why I Choose Astro over Next.js for Solo Projects

For sites that do not require continuous SSR, Astro, Content Collections, and Cloudflare Pages can reduce maintenance cost while improving speed.

Jun 1, 2026