B2B E-commerce Portal Development

I need a purpose-built B2B e-commerce portal that allows corporate clients and our field sales representatives to interact inside a single, secure environment. Unlike a standard storefront, the site should emphasise relationship management: every user signs up, lands on the appropriate dashboard, and can start a private conversation thread with the rep assigned to them before any order is placed.

Core workflow I have in mind:
• User registration & profile creation for two roles—client and sales rep.
• Internal messaging so both sides can discuss pricing, availability and order details in real time.
(We already manage product data in-house, so a full catalogue can be added later; the immediate focus is on the people connection.)

The underlying platform simply needs to support B2B logic; I’m open to a custom build or a framework that handles role-based access cleanly, provided it leaves room for future catalogue and payment modules.

Please base your proposal on:
• A clear outline of the tech stack or CMS you’d choose.
• Estimated timeline for delivering the registration, profile and messaging features in a production-ready state.
• Any security or GDPR considerations you plan to address.

I’ll supply branding assets and sample user flows once we start. Look forward to seeing how you would bring this client-rep marketplace to life.