01 Product Design
A Booking Calendar Needs Durations, Not Just Start Times
A 10 a.m. slot is not necessarily free if the previous service is still running. A simple booking calendar depends on durations, working hours, and overlap checks.
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ARTICLES
Articles about software development.
Notes on technical problems, decisions I made, and things I learned while working on projects.
02 IoT
A Device Alert Is Not the Final Decision
A sensor can detect that a first-aid box was opened. To understand what happened to its contents, the system still needs visual evidence, staff review, and stock records.
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03 Engineering
A QR Code Speeds Up Check-In, but It Is Not the Attendance Record
A QR scan and an attendance record serve different purposes. Keeping them separate makes event check-in easier to review, including repeat scans.
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04 Operations
Stock Should Not Change When a Request Is Submitted
In an inventory system with layered approvals, a request, a reservation, and a stock movement are three different events. Mixing them makes stock figures hard to trust.
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05 Engineering
Before Building a Dashboard, Fix the Data Flow
A polished dashboard is not much help when the data behind it is late, duplicated, or stuck in an unclear state. I prefer to sort out the data flow first, then decide which numbers and charts deserve a place on the screen.
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WEB
FORM / PORTAL
MOBILE
FIELD WORK
IoT
DEVICE EVENT
CORE / 01
SYSTEM
DATA & RULES VALIDATE / ACCESS / PROCESS- 01CAPTURE
- 02REVIEW
- 03CONNECT
OUTPUT
ACTION NEEDED
03
SUMMARY
DATA READY TO USE