Senior iOS Developer Needed

We are looking for an experienced iOS developer or small development team to build a high-quality adult coloring app for iPhone and iPad, similar in experience to Cozy Home: Comfy Coloring Book, but with custom branding and a scalable backend system.

The app must support:
Tap-to-fill coloring
Freehand drawing with Apple Pencil
Smooth zoom and pan
Layer-based coloring system
Subscription & in-app purchases
Admin dashboard to upload new coloring pages without resubmitting the app
This is a serious, production-level project — not a prototype

🎯 Project Goals
Build a scalable, App Store–ready coloring application that:
Provides a relaxing, premium adult coloring experience.
Supports both finger touch and Apple Pencil on iPad.
Allows the admin to upload new coloring canvases from a dashboard.
Uses a modern backend architecture.
Is optimized for performance and App Store compliance.
The final product will be published on the App Store.

🛠 Technical Requirements📱 Mobile App
Preferred Stack:
Native iOS using Swift
UI built with SwiftUI
Drawing engine using PencilKit
Advanced fill rendering using CoreGraphics or Metal if needed



Must support:
iPhone + iPad (iOS 15+ minimum)
Full Apple Pencil support on iPad with pressure sensitivity
🎨 Coloring Features1. Tap-to-Fill System
Closed-region color fill
Anti-bleed flood-fill algorithm
Works with SVG or region-mask images
Instant fill (no visible lag)



2. Free Draw Mode
Pencil + finger support
Pressure sensitivity
Brush types (marker, watercolor, soft brush)
Eraser
Undo/Redo
Layer separation from base line art



3. Canvas Controls
Pinch to zoom
Drag to pan
Reset view
Color palette system
Save progress automatically
Export as PNG/JPEG
Share sheet integration
🗂 Admin Dashboard Requirements
A web-based dashboard (or equivalent admin panel) that allows:
Content Management
Upload line art (SVG or high-res PNG)
Upload preview thumbnail
Optional region-mask upload



The app must automatically sync new content from the dashboard without App Store update.
☁️ Backend Requirements
Preferred:
Firebase (Firestore + Storage + Auth)
Alternative acceptable:
Custom backend (Node.js + PostgreSQL + AWS S3)
Backend must handle:
User authentication
Canvas metadata storage
Image storage
Subscription validation
Secure API access
Receipt validation (StoreKit server-side)



💰 Monetization Model
The app must support:
Freemium structure
Some free coloring pages
Premium pages locked
Subscription system
Monthly
Yearly
Free trial support

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