Mobile Job Title: Mobile App Developer – Bluetooth + Camera + Offline Database (Prototype)

Description:

I need a mobile app developer to build a simple prototype app for a clip on spectrometer device that detects fake drugs and food. The device connects to a phone via Bluetooth and sends 18 channels of spectral data. The phone camera captures a Raman spectrum image. The app compares the data to an offline database and shows a simple Green (genuine) or Red (fake) result.

What the app needs to do:

Connect to an ESP32‑S3 device via Bluetooth Low Energy (BLE)

Send a "START_SCAN" command to the device

Receive 18 numbers (NIR spectral data) from the device

Open the phone camera to capture a Raman spectrum image

Compare both data sets to a local offline database

Display a result: Green (genuine) or Red (fake)

Save scan history locally

Requirements:

Experience with Flutter or React Native

Experience with Bluetooth Low Energy (BLE)

Experience with offline databases (SQLite, Hive, or similar)

Basic understanding of cosine similarity or Euclidean distance (for matching)

Ability to work from a simple mockup (I will provide UI screenshots)

Nice to have (but not required):

Experience with TensorFlow Lite or on‑device ML

Experience with image processing (Raman spectrum extraction)

What I provide:

Complete UI mockup (screenshots)

Reference spectral database (CSV files from NIST/OpenSpecy)

BLE protocol document (what data is sent/received)

Ongoing communication and feedback

Timeline: 3–6 weeks for a working prototype

Budget: $300–600 (negotiable based on experience)

To apply: Send me a message with:

Examples of previous BLE or Flutter/React Native apps you've built

Your estimated timeline

Your preferred budget

https://tmt-omega.vercel.app/