1001 Freelance Projects -- Android Kiosk App for SUNMI K2

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Project title:
Android Kiosk App for SUNMI K2
Posted by:
External project from PeoplePerHour
Started:
03-Oct-2025 10:14 GMT
Description:
Overview Build a locked-down Android kiosk app for the SUNMI K2 (24", 1080×1920 portrait). The app will pull content from our WooCommerce /kiosk endpoint, cache it for offline-first operation, and expose native capabilities—printer, QR/camera, USB vending controller—to the web UI via a secure JS bridge. Payments are handled via Revolut Terminal API (semi-integrated): app initiates transactions, terminal performs PCI-scoped card flow, app receives results. Deliverables Production-ready APK/AAB + full source code (Git repo). JS bridge documentation + sample /kiosk bundle. Config guide (WooCommerce endpoints/keys, Revolut Terminal setup, supported USB VID/PIDs). Simple USB vending serial protocol spec + (nice-to-have) bench simulator. Test plan/results (unit, instrumented, hardware-in-the-loop) and admin cheat sheet. Scope & Requirements Content & Offline Fetch /kiosk HTML/JSON/assets from WooCommerce; verify signatures; local cache. Start from cache; background delta updates (WorkManager). Render via WebView (file://) with a minimal, audited JS↔Native bridge. Payments — Revolut Terminal (semi-integrated) App sends {amount, currency, orderId} to Revolut Terminal API/device. Handle async result (approved/declined/cancelled), update UI, print receipt, update WooCommerce order. Idempotent flow with retries; refund/void via PIN-protected admin. Peripherals Printer: SUNMI SDK / ESC/POS (receipts, admin prints). QR/Barcode: CameraX + ZXing/ML Kit; expose decoded payload to WebView. Vending: USB CDC/serial to control up to 12 slots; commands, timeouts, retries, job queue. (Optional) NFC: Read ISO14443/NDEF tokens for loyalty/account lookup. Kiosk & Resilience LockTask (pinned app), immersive full-screen, auto-start on boot. Watchdog to recover WebView/service on crash/hang. Branded offline page and graceful error states. Security/Privacy TLS + cert pinning to our APIs; signed content manifests. Admin menu with PIN; logs export with PII redaction; GDPR-aware. Telemetry Local event queue → batch upload (crashes, payment outcomes, dispense results, playback metrics). Acceptance Criteria (must pass) Boots straight into kiosk; recovers from kill/reboot in ~5s; no system chrome. Offline-first after initial sync. Full flow: Revolut card payment → vending dispense → receipt print → WooCommerce order update. 100 consecutive purchase cycles without ANR/crash on SUNMI K2. Signed bundle verification enforced; admin features behind PIN. Tech Preferences Kotlin + Jetpack (ViewModel, WorkManager, Room). Android WebView with shouldInterceptRequest asset interception; addJavascriptInterface for a minimal bridge. CameraX + ZXing/ML Kit; SUNMI SDK for printer/scanner where applicable. USB Host (CDC/FTDI), OkHttp3 with TLS pinning, Hilt DI. Crash/metrics (Crashlytics/Sentry); ProGuard/R8. What We Provide WooCommerce /kiosk endpoint + adverts and signing keys. Revolut merchant sandbox credentials and terminal. Test hardware access or remote test windows. API contracts and sample UI bundles. Experience Needed Android kiosk/terminal apps in production. Revolut Terminal or similar semi-integrated card workflows. USB serial on Android + ESC/POS printing. WooCommerce/REST integrations. Nice-to-Haves Prior SUNMI K2 integrations. Hardware-in-the-loop testing experience. Content signing/manifest verification patterns. Screening Questions (answer briefly) Outline your semi-integrated Revolut Terminal flow (init → async status → idempotent order update → receipt). How will you design a safe JS↔Native bridge so WebView stays sandboxed but can print/scan/dispense/pay? Your retry/timeout strategy for DISPENSE and payment callbacks. How do you keep kiosk mode after crashes/reboots and ensure quick recovery? Your approach to content signing and preventing activation of tampered bundles. Budget & Timeline Fixed-price: £____ (please propose) Timeline: ____ weeks (milestones welcome) Legal NDA and IP assignment required. Must provide code in a private Git repo throughout the project.
Project ID:
3452185
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