think in systems. ship what matters.
On January 20, we received ₩3,000,000 for a 6-month subscription. How much was January revenue? I thought it was ₩3,000,000. I was wrong.
Sangkyoon NamA passage from the Doctrine of the Mean, quoted in the Korean film The Fatal Encounter. The same principle applies to how we work.
Sangkyoon NamOpposing claims from the same stage. OpenAI's Ryan Lopopolo said 'code is free,' and Matt Pocock countered that 'bad code is the most expensive it's ever been.' Not a contradiction — two sides of the same coin.
Sangkyoon NamThe same month MCP hit 97 million downloads, Perplexity pulled away and the Y Combinator CEO built a CLI alternative in 30 minutes. There are things the downloads do not tell you.
Sangkyoon NamDissecting failure is subtraction. Dissecting success is addition. On reproducing what worked in the next chapter.
Sangkyoon NamA Broken Pipe that fell once or twice a month at dawn. pool_pre_ping=True wasn't enough. The culprit was the WSGI-era legacy baked into SQLAlchemy's scoped_session.
Sangkyoon NamThe Ship of Theseus paradox and the Strangler Fig pattern. When the last legacy code is gone, is it still the same service?
Sangkyoon NamAndrej Karpathy's LLM knowledge base methodology. A raw → wiki → output 3-layer architecture, incremental compilation, and knowledge linting. The era of manipulating knowledge instead of code is arriving.
Sangkyoon Namgit worktree is a decade-old feature, but it is gaining new relevance as infrastructure for running AI coding agents in parallel.
Sangkyoon NamI read it a year ago before changing jobs, and again recently to recommend to a colleague who just became a leader. Same book, different underlines.
Sangkyoon NamThe numbers executives present and the reality developers experience are different. We asked a developer at DeNA directly.
Sangkyoon NamIn 2026, DeNA revealed the results of going "AI All-In" for one year. The scale of numbers and depth of organizational transformation suggest this is not just a tool adoption — it marks a new inflection point for the Japanese IT industry.
Sangkyoon NamA 1-cent discrepancy in our settlement system. Rounding is not just math — it is business policy.
Sangkyoon NamThis post is based on my experience during the OKR hype. Many organizations have since reached similar conclusions, but I wanted to document what I observed firsthand.
Sangkyoon Nam