Hi, I'm Chen Sagi.
Engineer by day — apparently also engineer by night.
I write here about software, side projects, and making the shift from
vibe coding to agentic engineering. By day I'm an engineer; by night I
build my side projects with agentic engineering — and we'll explore how to use
every tool we can to ship end to end, with agentic solutions on popular
hosting platforms.
I pitted Claude Fable 5, Claude Opus 4.8, GPT-5.5 Codex, and Gemini 3.1 Pro against my iOS app in a blind, peer-judged bug hunt — then graded the judges against ground truth. The results surprised me twice.
