Mobile App Developer (FlutterFlow + Supabase) - South Wales

I am looking for an experienced mobile app developer to build a field lookup and grading tool from scratch for my catalytic converter recycling business, Crucible Exchange Ltd.

The app will be used on-site in the yard to quickly look up codes from a catalogue of ~14,500 items, factor in live PGM market movements, apply a custom margin fee structure, and calculate net buy prices on the spot.

Key Scope & Requirements:

Database & Scale (Supabase): Set up a PostgreSQL database handling ~14,500 catalog rows with image storage, optimized full-text search indexing across both primary and extra codes plus manufacturers, and proper Row Level Security (RLS).

Mobile Layout Architecture (FlutterFlow): Build a mobile-first ListView using custom Cards (Thumbnail Image, Primary Code, Extra Code, Manufacturer, Description) designed for fast, one-handed scanning on smartphones.

Search & Pagination: Implement server-side filtering and infinite-scroll pagination so 14.5k rows load instantaneously without lagging.

Pricing & Margin Engine: Integrate calculation logic that applies a percentage fee/margin structure against base PGM values or fixed pricing data.

Condition Grading Modifiers: Include quick-select buttons on the pricing view (Full Core - 100%, Partial/Damaged - %, Empty - 0%) that dynamically adjust the calculated buy price on the fly.

Batch Tally / Basket Feature: Allow users to tap "Add to Batch" on multiple converters to build a running total payout list for multi-unit purchases with an itemized summary output.

In-Person Kickoff: Must be based in or near South Wales (Cardiff, Newport, Swansea, Hengoed, or surrounding M4 area) for an initial in-person meeting to go over the physical dataset and valuation workflow.
etc...

Deliverables:
Fully working mobile app built directly inside my existing FlutterFlow and Supabase accounts with 100% IP/source handover.

Budget:
Fixed Price: £1,000 (Split across 3 Escrow Milestones)