WhatsApp Case 03 · Agricultural transport
Transporte OMA
From the paper log to fuel control.
The case
From paper at the pump to a phone.
Context
An SMB that hauls farm machinery: 8 trucks and its own diesel tank.
Problem
A paper sheet at the pump: only 8 of 15 refuels had the odometer reading, and 200 L didn't add up without anyone noticing.
Solution
An installable app logs every refuel with a photo of the flow meter, even offline, and checks on its own that the pump reading adds up.
Result
Scope
Ten features in twelve days.
Refuel at the yard
With a photo of the flow meter; odometer and pump pre-filled.
Refuel at a gas station
With its receipt.
Offline, with the office PC off
The refuel stays on the phone and uploads on its own.
Pump and odometer checks
Whatever doesn't add up gets flagged.
Refuel log
With filters and photos.
Consumption and monthly summary
L/100 km by leg and by month.
Excel for the accountant
The month, exported.
Corrections that keep the history
Void with a reason or replace.
Alert center
Live: what happened and what to do.
Fleet and users
Adjusted without the developer.
Control
Every litre matches the last.
The pump is the control; if it doesn't add up, an alert opens.
Nothing is lost offline.
The refuel stays on the phone and uploads on its own, without duplicates.
Correct without deleting.
The original stays visible, struck through, with who and when.
How it was built
From request to module, in 12 days.
- 8 Oct Request and first screens
- 9–12 Oct Architecture, no code
- 11 Oct The real paper log changes the scope
- 12 Oct MVP for the office
- 13–19 Oct Built in short steps
- 18 Oct Server at the office
- 19 Oct Diesel module built
Walkthrough
A refuel at the yard, in five steps.
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01 HomeAlerts and the Diesel shortcut.
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02 Pick the truckTruck 04, at the yard.
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03 Flow meter photoProof first.
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04 Litres and pumpPre-filled: it tells you if it adds up.
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05 Saved offlineUploads on its own when signal returns.
Gallery
Diesel control, screen by screen.
All screenshots show sample data.
Next step
Tell me how your company works.
The first step is an Operations X-ray: a process map, prioritized pain points and a closed scope.
Software comes second.
