Graphic Designer Needed to Create IAB-Compliant Background Templates for Ad Creative Generator MVP

We are building a prototype for an AI-based tool that generates digital ad creatives using product images, overlaid text, and pre-designed backgrounds. We need a skilled graphic designer to create a set of stylish and professional ad background templates that comply with IAB ad size standards.

Scope of Work:
Design visually appealing background images for static ads (no product or text, just the design)
Ensure each design follows standard IAB dimensions, such as:
- 300x250 (Medium Rectangle)
- 728x90 (Leaderboard)
- 1080x1080 (Social Square)
- 1200x628 (Facebook/Twitter Landscape)
Backgrounds should:
- Be theme-based (e.g., tech, fashion, health)
- Leave ample space for product and text placement
- Work well with overlay automation
Deliver assets in transparent PNGs or layered PSDs for easy composition

Deliverables:
At least 10 original background templates
Grouped by style or use-case
Ready for commercial use (original work or royalty-free elements only)

Ideal Candidate:
Strong aesthetic sense for ad layouts
Familiarity with IAB display ad specs
Comfortable with ad/ecommerce styling
Optional: Experience designing for automation tools or templates