QR-Based Mobile Diagnostic System Development

Buyback Device — Mobile Diagnostic Software

Budget: $50 USD — MVP / Prototype

We need a developer to build a QR-based mobile diagnostic system for iPhone/iOS and Android, inspired by the general diagnostic workflow used by large mobile buyback companies such as Cashify.

We want to develop our own diagnostic software, not copy any company’s proprietary technology.

MAIN WORKFLOW

Technician creates inspection
↓
QR Code generated
↓
Customer scans QR
↓
iPhone / Android automatically detected
↓
Diagnostic starts
↓
Automatic + Guided Tests
↓
Results sent to Dashboard
↓
PASS / FAIL / WARNING

QR SYSTEM

The technician creates a unique inspection and generates a QR code.

Customer scans the QR and the diagnostic session opens automatically.

No manual session ID entry.

The session should securely connect:

* Inspection ID
* Device
* Technician
* Store
* Date/time

iOS + ANDROID

iOS

Preferred: Swift / SwiftUI

Android

Preferred: Kotlin

Use only legitimate public APIs. No jailbreak, root, private APIs or security bypasses.

The developer must clearly identify what is:

* Automatic
* Guided/manual
* Not supported

DIAGNOSTIC TESTS

The system should support as many of the following as legally/technically possible:

Device

* Model
* OS/version
* Storage
* RAM where available
* IMEI/serial where legitimately available

Battery

* Battery level
* Battery health where available
* Charging status
* Temperature/cycle information where available

Charging

Customer connects the charging cable.

System checks supported charging/USB detection and returns:

PASS / FAIL / MANUAL

Display & Touch

* Display test
* Colour test
* Brightness
* Touchscreen
* Multi-touch
* Dead-zone test

Buttons

Customer presses:

* Volume Up
* Volume Down
* Power/Side button
* Home/Back buttons where applicable

Each button should show:

✓ WORKING / ✕ NOT DETECTED

Camera

* Front camera
* Rear camera
* Flash
* Autofocus where available

Audio

* Speaker
* Earpiece
* Microphone

Other

* Vibration
* Accelerometer
* Gyroscope
* Proximity
* Compass
* Wi-Fi
* Bluetooth
* GPS
* SIM/network
* NFC where supported
* Biometric availability

GUIDED TESTS

For tests that cannot be completely automated, the app must guide the customer.

Examples:

Touch: Touch all points on screen.

Speaker: Play sound → customer confirms.

Microphone: Record voice → play back → customer confirms.

Camera: Take test photo.

Buttons: Press each physical button.

ACCOUNT / LOCK CHECK

Before buyback, guide the customer to remove:

iPhone: Apple Account / Find My / Activation Lock readiness.

Android: Google account/device protection readiness.

Never request or store Apple/Google passwords.

TECHNICIAN PHYSICAL INSPECTION

Technician can check:

* Screen scratches/cracks
* Body/frame
* Camera glass
* Charging port
* Buttons
* Liquid damage
* Battery swelling
* Physical damage

Allow photos to be uploaded.

RESULT

Every test must show:

PASS / FAIL / WARNING / MANUAL / NOT SUPPORTED

Example:

Battery PASS
Display PASS
Touch PASS
Camera PASS
Speaker PASS
Microphone PASS
Buttons PASS
Charging PASS
Sensors PASS
Wi-Fi PASS

DASHBOARD

Basic technician dashboard:

* Create inspection
* Generate QR
* View connected device
* View test progress
* View results
* Complete inspection

FUTURE DEVELOPMENT

The architecture should allow future:

* Buyback Device 32-Point QC
* Device grading
* Buyback price calculation
* Repair-cost deduction
* Market-price engine
* PDF inspection report
* QR report verification
* Multi-store management
* Inventory/refurbishment tracking
* AI pricing engine

TECHNOLOGY

Preferred:

iOS: Swift/SwiftUI
Android: Kotlin
Backend: Supabase/PostgreSQL
Dashboard: Next.js

Alternative technology may be proposed with justification.

$50 MVP DELIVERABLE

For the $50 fixed budget, we need a working proof of concept demonstrating:

QR → iPhone/Android detection → Diagnostic Session → Real Tests → PASS/FAIL Results → Technician Dashboard

The developer must demonstrate the MVP on one real iPhone and one real Android phone.

No fake diagnostic results.

FREELANCER MUST ANSWER

1. What iOS tests can you actually implement?
2. What Android tests can you implement?
3. Which tests are automatic vs manual?
4. How will the QR session work?
5. What technology will you use?
6. Can you test on real devices?
7. What exactly is included in the $50 MVP?
8. Delivery time?
9. Will you provide complete source code?
10. What technical limitations do you identify?

Generic proposals will not be preferred.

FINAL GOAL

Build our own professional:

QR Scan → iOS/Android Diagnostic → Automatic Tests → Guided Tests → Charging & Button Tests → Hardware Tests → Physical Inspection → QC → Device Grade → Buyback Valuation → Report

The $50 project is Phase 1 MVP; the full production platform will be developed in future phases.