Android/iOS Production App Development

We are a food manufacturing company looking for an experienced Senior Flutter/Full-Stack Developer to build an Android & iOS production app for our factory. We use Omni Accounts ERP. The app will digitise our factory-floor workflow from production orders through to delivery. Main workflow: ERP → Job Card → Scaling → Bulk/Packaging Picking → Mixing → Packing → QC → Delivery. Each Job Card must track the batch through every stage, with digital checklists, BOM/formulas, quantities, batch & expiry numbers, QC checks, photos, waste, approvals and a full audit trail. We also want a Receiving module: Supplier delivery → truck/product checks → photos/documents/COAs → QC approvals → stock/ERP. The app must be simple for factory workers, with large buttons, tick boxes, barcode/QR scanning, photo uploads and ideally offline capability. Strong experience required in Flutter, APIs, ERP integration, databases, manufacturing workflows, QC and mobile apps. Please provide relevant previous projects and explain how you would approach Omni ERP integration. We want a long-term development partner who can also suggest improvements.