Experienced Full-Stack Developer for Professional Modular Avatar System Integration (Next.js)

I need a developer to build and fully integrate a professional modular avatar customization system into my existing Next.js application, Create a clean, scalable, layered avatar system (multiple body bases, hair styles, clothing, accessories, backgrounds). Support rarity tiers (Common, Rare, Epic, Legendary, Mythic) with clear visual differentiation and effects (glows, particles, animations). Style direction: Stylized realism (similar to modern Bitmoji / Fliff avatars or Clash of Clans characters. Premium, not cartoonish). Full integration across the app: User profiles & avatar editor Home dashboard Group & leaderboard pages Face-Off screens Resolution / scoreboard screens Pack/shop system foundation (users buy packs to unlock cosmetic items). Deliver all source files, layered assets (PSD/PNG/WebP), and clean, well-documented code. Deliverables: Working avatar editor/customization screen. Avatar rendering component integrated into all major app surfaces. Basic pack opening UI + rarity system. Full source code + asset pipeline documentation. All work must be delivered with complete IP ownership transfer (NDA + signed IP assignment agreement required). Advanced animations (idle, emotes, celebration). More character diversity (body types, skin tones, etc.). Additional monetization features (crafting, trading). Timeline: 4–10 weeks (milestone-based). Budget: $8,000-12,000