Automated Checkout Tool Development

Looking for an experienced developer to build an automated checkout tool (request-based preferred) for online stores.

Target sites:
- Shopify stores
- BASE (thebase.in) shops in Japan
- Several other Japanese e-commerce sites (details shared after discussion)

Requirements:
- Proven experience building checkout automation / web automation tools
- Experience handling captcha, queue systems and bot protection (Cloudflare, Akamai, etc.)
- Support for proxies (Japanese residential IPs), multiple profiles and tasks
- Familiar with Japanese address/phone formats and payment flows is a big plus
- Clean, documented code. Source code must be pushed to my GitHub repo

Project structure:
- Start with ONE module (Shopify) as a paid trial milestone
- If successful, continue with BASE and Japanese sites as separate milestones
- Ongoing monthly maintenance contract available for the right developer

Please include in your proposal:
- Examples of similar tools you have built (demo/video if possible)
- Your estimated price and timeline for the Shopify module
- Your maintenance pricing