Bluetooth Fingerprint Attendance MVP App
Budget: $250 – $750 USD
Description:
I’m building a very focused Android MVP for farm worker attendance using a Bluetooth fingerprint scanner.
Core idea
A farm manager uses an Android phone + external Bluetooth fingerprint reader in the field.
They:
Select/enter the farm location or block
Connect to a Bluetooth fingerprint scanner
Let workers scan their fingerprint to mark attendance
Enter a daily rate for that session (or per worker)
Sync data to a backend and export CSV/Excel for payroll
I already have a potential Bluetooth fingerprint scanner with SDK/API shortlisted (Android support claimed). I’ll handle contact with the hardware supplier and share the SDK docs and sample app with you.
Scope of work (MVP)
You will:
Android app (native, Kotlin or Java)
Implement Bluetooth connection to the provided fingerprint scanner using the vendor SDK
Fingerprint enrollment flow (link templates to worker records)
Attendance scan flow:
Manager selects/inputs location
Manager enters daily rate
Each scan creates an event: worker, timestamp, location, rate
Basic offline storage (e.g., Room/SQLite).
Sync to a simple REST backend (I’m open to your recommendation: Firebase/Supabase/simple API).
Backend (very simple)
Minimal API for: employees, sessions, attendance events
Ability to export data (CSV/Excel) by date/location for payroll import
Simple admin UI or even just basic endpoints is fine for MVP.
Deliverables
Android Studio project with clean, well‑structured code
Basic documentation on setup, build, and how to run against the scanner
Short written note on any limitations or edge cases
Requirements
Strong experience with Android native development (Kotlin or Java)
Solid experience with Bluetooth / BLE on Android
Must have integrated external hardware via an SDK before (barcode scanner, fingerprint reader, or similar)
Comfortable working from vendor SDK docs and example projects
Familiar with offline‑first patterns (local DB + background sync)
Nice to have:
Previous work with biometrics (fingerprint, face, etc.)
Experience with time & attendance or payroll-related apps
Familiarity with Firebase/Supabase or simple Node/Express/Django backends
How we’ll work
I will provide:
The exact scanner model, SDK package, docs, and sample APK/source from the vendor
A short functional spec and data model
You will:
Propose a brief implementation plan
Start with a paid test milestone: connect to the scanner on Android and prove we can capture a fingerprint event and identify a user
What to include in your proposal
2–3 sentences on your relevant experience with Bluetooth and hardware SDKs on Android
Any links/screenshots to similar apps you’ve built (especially with scanners or biometrics)
Your estimate (in weeks) for:
(a) scanner integration + local prototype
(b) full MVP with backend + CSV export
Your preferred tech stack for the backend (if you will handle it too)
I’m building a very focused Android MVP for farm worker attendance using a Bluetooth fingerprint scanner.
Core idea
A farm manager uses an Android phone + external Bluetooth fingerprint reader in the field.
They:
Select/enter the farm location or block
Connect to a Bluetooth fingerprint scanner
Let workers scan their fingerprint to mark attendance
Enter a daily rate for that session (or per worker)
Sync data to a backend and export CSV/Excel for payroll
I already have a potential Bluetooth fingerprint scanner with SDK/API shortlisted (Android support claimed). I’ll handle contact with the hardware supplier and share the SDK docs and sample app with you.
Scope of work (MVP)
You will:
Android app (native, Kotlin or Java)
Implement Bluetooth connection to the provided fingerprint scanner using the vendor SDK
Fingerprint enrollment flow (link templates to worker records)
Attendance scan flow:
Manager selects/inputs location
Manager enters daily rate
Each scan creates an event: worker, timestamp, location, rate
Basic offline storage (e.g., Room/SQLite).
Sync to a simple REST backend (I’m open to your recommendation: Firebase/Supabase/simple API).
Backend (very simple)
Minimal API for: employees, sessions, attendance events
Ability to export data (CSV/Excel) by date/location for payroll import
Simple admin UI or even just basic endpoints is fine for MVP.
Deliverables
Android Studio project with clean, well‑structured code
Basic documentation on setup, build, and how to run against the scanner
Short written note on any limitations or edge cases
Requirements
Strong experience with Android native development (Kotlin or Java)
Solid experience with Bluetooth / BLE on Android
Must have integrated external hardware via an SDK before (barcode scanner, fingerprint reader, or similar)
Comfortable working from vendor SDK docs and example projects
Familiar with offline‑first patterns (local DB + background sync)
Nice to have:
Previous work with biometrics (fingerprint, face, etc.)
Experience with time & attendance or payroll-related apps
Familiarity with Firebase/Supabase or simple Node/Express/Django backends
How we’ll work
I will provide:
The exact scanner model, SDK package, docs, and sample APK/source from the vendor
A short functional spec and data model
You will:
Propose a brief implementation plan
Start with a paid test milestone: connect to the scanner on Android and prove we can capture a fingerprint event and identify a user
What to include in your proposal
2–3 sentences on your relevant experience with Bluetooth and hardware SDKs on Android
Any links/screenshots to similar apps you’ve built (especially with scanners or biometrics)
Your estimate (in weeks) for:
(a) scanner integration + local prototype
(b) full MVP with backend + CSV export
Your preferred tech stack for the backend (if you will handle it too)