Cristoval Martinez
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Remexis · Healthcare / SaaS

Scaling Medical AI with Intelligent Billing

Remexis is a cutting-edge, AI-powered platform providing evidence-based natural medicine guidance for healthcare professionals. To support its evolution into an enterprise-grade solution, we architected and implemented a comprehensive B2B billing and organization management subsystem. This infrastructure enables clinics and medical teams to manage seats, track real-time AI usage, and handle complex subscription lifecycles. By integrating a resilient Stripe-based event pipeline and a granular auditing ecosystem, we empowered Remexis to scale from a single-user tool to a multi-tenant platform ready for global healthcare teams.

2026SaaS DevelopmentFinTech IntegrationInfrastructure Scaling
Remexis
The problem

What was in the way

Remexis needed to transition from a basic user model to a scalable B2B framework capable of handling multi-tenant organization management and precise feature metering.

  • Transitioning to a multi-tenant B2B organization structure
  • Implementing precise seat-based provisioning and billing
  • Need for real-time tracking of AI query usage and limits
  • Requirement for a resilient, audit-ready billing ecosystem for compliance
What got built

The system that fixed it

We engineered a robust billing architecture using Next.js, Stripe, and Prisma, focusing on high availability and synchronization at the organization level. The solution features a custom webhook listener with advanced idempotency mechanisms, a granular usage tracking subsystem, and a comprehensive admin auditing dashboard to ensure transparency and operational excellence.

  • Custom B2B billing subsystem with Stripe integration for seat-based pricing
  • Resilient Webhook Listener pipeline with cryptographic verification and idempotency
  • Granular Usage Tracking system for real-time AI query monitoring and metering
  • Centralized Organization Management dashboard for tenant-level administration
  • Automated Fail-Safe processing with custom grace periods for payment failures
  • Rich Audit Ecosystem for tracking comprehensive subscription and event histories
Next.jsStripePrismaPostgreSQLReact Query
Results

What changed

Scalable
Multi-tenant architecture
Real-time
Usage & seat metering
Automated
Invoicing & Provisioning
100%
Idempotent event handling

“Cristoval is an exceptional developer who truly excels under the pressure of a live production launch. He successfully navigated complex system integrations, ensuring every part of the application was rock solid before handover. What sets him apart is his commitment to security and a clean transition; he verified every audit log and setting to ensure I had full ownership as the client. He is methodical, an excellent communicator, and stays focused until every hurdle is cleared. If you need a professional to take your project from development to a live, functional state, Cristoval is the person to hire. I am extremely satisfied and highly recommend his services.”

Gary · Owner, Remexis
Screens

What it looks like

Cristoval Martinez

If any of that sounds familiar

Tell me how money gets into your business. I'll tell you what I'd look at, and whether it's worth doing anything about.

Cristoval Martinez