Build a Used Car Selling and Auction Website with Admin Panel

Description:
I’m starting an online business exporting used Japanese cars to buyers overseas, and I need a full website where I can list cars, sell them directly and run auctions. I’m looking for an experienced developer or team to build it from scratch, with a full admin panel so I can manage everything myself.

Buyer side:

Car listings with photos, specs, mileage, auction grade, price and condition
Search and filters by make, model, year, price, fuel type, transmission and body type
Live auctions with real-time bidding, countdown timers, a reserve price and auto-bid
A “Buy Now” option for fixed-price cars
User registration and login, a watchlist, a bid history and an orders page
Online payments or deposits, plus invoices
Language and currency switchers
Contact options: WhatsApp, an inquiry form and email notifications
Pages for how buying works, shipping, FAQs and About us

Seller / dealer side (optional):

Dealers can register and post their own cars, with admin approval before anything goes live

Admin panel:

Dashboard with sales, bids, users and revenue stats
Add, edit and delete cars with bulk image upload
Manage auctions (start and end times, reserve price, picking the winner)
Manage users, dealers, orders, payments and inquiries
Track shipping and documents for each order
Manage content (banners, pages, testimonials, FAQs)
Roles and permissions for staff

Other requirements:

Mobile-friendly, fast and SEO-optimized
Secure, and able to scale as stock grows
Source code handed over, deployment, and a short training session
Support after launch