Guard Check-in

Guards often work on basic phones with limited storage and data. Asking them to install and learn another app means poor adoption and gaps in the shift record.

A Fastify service manages each shift as a state machine. Scheduled jobs send WhatsApp prompts at set intervals; the guard replies with a photo, which is stored with its timestamp. If a check-in is missed, an escalation flow alerts the site supervisor.

[ Fastify + Prisma service ]
        │ scheduled prompt
[ WhatsApp Cloud API ]
        │
[ Guard replies with photo ]
        │ no reply in time
[ Supervisor escalation ]

• No mobile client at all: WhatsApp is the entire guard-facing interface.
• Prisma and PostgreSQL keep a durable audit trail of every prompt, reply and escalation.
• Scheduling is timezone-aware so night shifts and daylight changes do not skew intervals.

• Guards need nothing installed beyond WhatsApp.
• Every check-in is stored as a timestamped photo for later audit.
• Missed check-ins escalate to supervisors automatically.

• Node.js
• Fastify
• Prisma
• PostgreSQL
• WhatsApp Business API
• TypeScript