Optimize & Expand NestJS Backend

My current NestJS back-end is showing performance bottlenecks and the occasional error spike, so I’m looking for a developer who can step in, stabilise the codebase, and then extend it with fresh functionality.

First, I need a careful audit of the existing modules to trace memory leaks, slow queries, or blocking calls that are dragging response times down. Once the system runs smoothly, I want to roll out several new API endpoints with the accompanying database migrations and schema updates. Clean, version-controlled TypeORM (or Prisma) migrations and concise Swagger/OpenAPI docs are a must so my front-end team can consume the changes without guesswork.

The project also includes wiring in payment and notification capabilities. If you have hands-on experience integrating Stripe (or similar gateways) alongside email, SMS, or push services, that will accelerate our timeline. Connection logic should follow NestJS best practices—config-driven modules, guards for security, and test coverage so we can deploy confidently.

Deliverables
• Resolved bugs and measurable performance gains (target