Engineering blog
Practical writing for senior developers, engineering managers and technical founders — performance, data, SaaS architecture, applied AI, payments and mobile.
How DEV3 AI Events & Tickets encodes QR codes in plain PHP with Reed–Solomon and mask scoring, draws vector PDF tickets, scans with BarcodeDetector or jsQR, and admits each ticket once with a single conditional UPDATE.
How DEV3 AI Booking & Appointments keeps slots on the wall clock across daylight saving changes and timezones, measures appointments in real minutes, and re-runs the same engine under a MySQL lock so two customers can't take one slot.
How DEV3 AI Auto Blogger keeps AI-written posts offline until an editor approves them: one wp_insert_post_data guard that covers cron, REST, XML-RPC and authors, approval recorded after the write, and a scoped autopilot bypass.
Image models return flat RGB. How DEV3 AI Product Image Studio gets real transparent PNGs, exact square pack shots and honest upscales by letting the model paint and PHP's GD extension do the measuring.
