An idempotent service must never trust client‑supplied names. This piece shows how server‑side identity, atomic state, and UUIDv4 naming prevent double‑spend and keep distributed systems safe under failure.
Retries hide duplicated operations your service cannot see. This piece shows why idempotency depends on the operation name you choose.
Residuality is the discipline of designing boundaries that keep future options open by preventing early implementation choices from defining a whole architecture.
A complete specification is an illusion; real systems demand incremental discovery, and SDD only works when treated as a tool inside an iterative TinySlice loop. Winston Royce knew this in 1970.
Asynchronous IO exposes hidden waits and coupling, revealing backpressure early and making system behaviour observable.
LLMs have reached a ceiling; the next gains require engineering, not scale.
LLMs generate code, but they cannot see the engineering decisions that keep systems safe.
Junior engineers evolve toward judgement, verification, and system awareness as AI absorbs the mechanical act of coding.
LLMs can generate code, but they cannot modify or maintain systems because system‑level work requires causal reasoning, not pattern‑matching.