Title: iOS developer — integrate TSL 3138 UHF RFID reader (Bluetooth SDK) into existing app
Type: Fixed-scope contract (small, well-defined first project — potential for ongoing work)
Overview:
We have a working iOS app prototype for a moving-industry operations system. We need a developer to integrate a TSL 3138 Bluetooth UHF RFID handheld reader so the app can scan RFID tags and drive a proximity-based "find" feature. This is a self-contained first engagement; strong work leads to a larger ongoing backend build.
Scope of this contract:
Pair the app with the TSL 3138 over Bluetooth (connect, disconnect, reconnect, battery/status).
Inventory read: trigger a scan and receive the list of tag IDs (EPCs) in range.
Reconciliation: compare scanned tag IDs against an expected list and flag which are missing.
Hunt / proximity mode: stream each target tag's signal strength (RSSI) and expose it so the app can produce a "hotter/colder" cue as the operator approaches — tuned so a tag only confirms at close range (~1–4 ft), not across a room. (Achieved by adjusting reader transmit power and an RSSI threshold.) TSL's RFID Tag Finder demo app implements this behavior and is a useful reference.
Read a QR code via the reader's built-in 2D imager (and/or device camera) as a fallback tag-ID input.
Required skills:
Native iOS development (Swift).
Experience integrating a Bluetooth hardware SDK — RFID, barcode scanner, or similar peripheral. (Please describe a past project where you connected an app to a physical Bluetooth device.)
Comfort reading a manufacturer's hardware SDK/documentation.
Nice to have:
Prior RFID/RAIN/UHF experience.
Full-stack ability (Node/backend, databases) for potential ongoing work.
We provide:
The existing app prototype (demonstrates the full workflow and UI).
A written spec defining the read, reconciliation, and hunt-mode behavior.
The TSL 3138 reader hardware and TSL's iOS SDK (including the RFID Tag Finder demo).
Deliverable: working reader integration demonstrated on our physical TSL 3138 + iPad, with the scan behaviors above functioning against real tags. Source code delivered and documented.
To apply: briefly describe a Bluetooth-hardware integration you've shipped, and note any RFID experience.