SellExpert.io: AI-Powered B2B Prospecting

Context

B2B companies waste considerable time on manual prospecting: lead research, qualification, outreach via web forms. Traditional methods (cold emailing, LinkedIn, freelancers) are expensive and hard to scale.

The challenge

Build an all-in-one platform capable of generating qualified lead databases from 8M+ companies, then automatically submitting offers via website contact forms, while handling CAPTCHAs, scoring and campaign tracking.

The solution

I designed and developed SellExpert.io from scratch as a fullstack developer: a React dashboard, an Express/TypeScript API, and a form automation service with Browserless. All integrated with Supabase, Stripe, DataForSEO, OpenAI and 2captcha.

Key features

• 01Lead scraping via DataForSEO and Google Maps (8M+ companies)
• 02Automatic web form filling with smart field detection
• 03CAPTCHA solving (reCAPTCHA, Turnstile, hCaptcha) via 2captcha
• 04Campaign system with real-time tracking and batch processing
• 05Analytics dashboard with KPIs, Recharts graphs and live monitoring
• 06Payments and subscriptions via Stripe with PDF invoice generation
• 07Supabase authentication with RBAC (owner, admin, user) and multi-tenancy
• 08Documented API with Swagger/OpenAPI