NexusB2B

Inspiration

B2B partnerships are still fragile and slow—companies hunt for each other through cold outreach, inconsistent broker networks, and unverified online profiles. Even when both sides are legitimate, the process is hard to trust and hard to start. NexusB2B was built to replace that friction layer with a verified network and a structured, AI-assisted path from “I’m interested” to “let’s talk seriously.”

What it does

NexusB2B is a verified B2B discovery and deal platform that connects businesses through:

Verified discovery: only identity-checked businesses appear in search. AI-mediated introductions: when a deal session opens, Lummy introduces both parties, summarizes relevant context, and kickstarts the conversation. Structured deal sessions: conversations live inside dedicated sessions rather than scattered threads. Receipts as accountable outcomes: sessions can produce signed/recorded receipts that serve as lightweight agreement artifacts and can be shared via email. Business-first trust rules: verified profiles are protected—changes require platform review, and sensitive payment/banking details are encrypted.

How we built it

Next.js (App Router) + TypeScript for the full product experience (landing, auth, dashboard, admin, and business flows) , using vercel v0. NextAuth v5 (JWT) for secure authentication and session handling. Aurora PostgreSQL for core relational data (businesses, users, sessions, receipts). DynamoDB for fast, scalable chat message storage tied to sessions. S3 for storing logos and verification documents. Resend for transactional email (verification and receipt delivery flows). Gemini-powered AI (via an OpenAI-compatible endpoint) to: parse natural-language discovery intent, generate formal session introductions, support AI-assisted behavior (including demo mode where applicable). Security-by-design: encrypted banking details (AES-256-GCM) and request-based profile updates to preserve network trust.

Challenges we ran into

Trust without slowing users down: verification must be strict enough to build confidence, but fast and understandable so businesses don’t churn. Natural-language matching: B2B queries are nuanced, so we needed reliable intent extraction and safe matching logic (avoiding accidental keyword collisions). Session orchestration: ensuring deal sessions, message flows, and receipt generation remain consistent and auditable across roles (platform admin vs business admin vs agents). Secure handling of payment data: keeping banking details usable for receipts while protecting them at rest required careful encryption and retrieval practices. Accomplishments that we're proud of A fully integrated verified network → session → receipt workflow that turns discovery into accountability. AI introductions that reduce the cold-start problem—sessions begin with structured context rather than blank chats. A clean role model (platform admin vs business admin vs business agent) with admin oversight of verification and profile changes. A production-ready architecture that combines the right storage technologies: Aurora for core entities, DynamoDB for chat, S3 for documents, email automation for delivery.

What we learned

In B2B, the biggest product win is often trust + structure, not just “better matchmaking.” AI is most useful when it’s placed at the right moments: discovery parsing and session introductions provide value immediately without requiring the whole experience to be automated. Security and governance aren’t add-ons—they shape the data model and user flows (e.g., change requests, encryption, and auditable artifacts).

What's next for NexusB2B

Expand verification coverage and add richer profile signals while maintaining strict governance. Improve AI experiences with deeper session context (e.g., better summaries, dynamic next-step suggestions). Add more receipt automation (templates, standardized terms, and richer acknowledgment flows). Broaden industry-specific discovery intelligence and introduce smarter matching for multi-step deal processes. Strengthen analytics for both admins and businesses (conversion metrics from discovery → session → receipt).

Built With

• dynamodb
• next.js
• postgresql
• s3
• typescript