Project
Loyalty Program Platform
Backend for a nationwide retail loyalty program serving 480k+ daily users at 50+ requests per second with 99.9% uptime.
Overview
Kiosko’s loyalty program is the customer-facing rewards layer across a nationwide convenience store chain with 1000+ stores across Mexico. I lead backend development of the platform, which serves 1.4M+ registered users and 480,000+ daily users at a sustained 60+ requests per second while holding 99.9% uptime.
The backend acting as a middleware between the point of sale and Salesforce owns point accrual and redemption, a promotion handling module, customer identity, and the synchronization contract with Salesforce as the system of record.
Architecture
The hard constraint was that the program could not go dark during the platform transition. Rather than a cutover, I architected a dual migration strategy: the legacy and new platforms ran in parallel behind a custom interface that normalized both backends into a single contract. Consumers were migrated incrementally, and the interface absorbed the differences — zero downtime through the entire migration.
Services are written in TypeScript on Node.js, deployed on Azure, with PostgreSQL for transactional data and Redis for the caching layer. The codebase leans on OOP and SOLID principles — the parallel-platform interface in particular depends on clean substitution boundaries to keep both implementations swappable.
Impact
- 1.4M+ registered users and 480k+ daily active users served at 99.9% uptime
- 60+ req/s sustained throughput
- Zero downtime across a full platform migration
- CI/CD on Azure DevOps and GitHub Actions