Android Developer for Offline Physical Inventory Module

Overview We're looking for an experienced Android developer to extend an existing Java/AndroidX scanner app with a new offline physical inventory counting module. The app is a barcode data-collection system integrated with Sage 300. The module must be fully self-contained and follow an existing in-app pattern (signature capture) that we'll share as your reference. What you'll build Two components - Android app module + web service methods: Android (primary scope): - New "Offline Physical Count" menu entry and Activity - Download and locally persist a count dataset (up to 5,000 lines) at the start of a count - Full offline counting UI: scan barcodes (using existing scanner integration), manual item search, quantity entry, edit, and review - Offline barcode-to-item resolution using cross-reference data bundled in the download - Progress persistence across app restarts and reboots (local database - app has none today, must be added) - Upload completed counts on reconnection, with idempotent retry and result handling Web service (ASMX SOAP, .NET Framework): - Three new relay methods: DownloadCountData, UploadCountData, GetCountResult - No changes to existing methods or logic - strictly additive A detailed requirements document (v0.3) is available, including data contracts (JSON payload schemas), integration boundary diagrams, and a reference to the existing signature-capture pattern your work should mirror. Source code for the existing app and web service will be provided to the selected developer. Timeline This is time-critical. Delivery deadline is August 17, with joint end-to-end UAT the following week and go-live by August 24. We will not move forward with a candidate who cannot commit to this schedule. What we provide - Full Android app source + web service source - Detailed requirements doc with data contracts - Figma designs for the counting UI/UX - Test environment with Sage 300 test company, sample data, and test terminal IDs - Active technical contact for questions and joint testing Requirements - Strong Java/AndroidX experience - no React Native or cross-platform frameworks - Comfortable reading and extending an existing codebase (not a greenfield build) - Experience with local SQLite/Room database on Android - Familiarity with SOAP web services is a plus (.NET/ASMX experience helpful but not required) - Ability to commit to the August deadline - please confirm availability in your proposal How to apply In your proposal, please include: 1. Relevant Android projects you've worked on (existing app extensions preferred over greenfield) 2. Your availability and ability to meet the August deadline 3. A ballpark fixed-price or hourly estimate for the scope described