Sergio Dennis Miranda Perez

I’m a systems engineer and Backend Developer with 4+ years of experience building REST APIs and full stack web applications for enterprise environments. I specialize in backend architecture, RBAC system design, JWT authentication, and concurrent management of relational and NoSQL databases, with a strong commitment to clean code, scalability, and automated testing.

In my most recent role, I designed and built an internal financial control web app with a complete RBAC architecture (JWT middleware plus granular permission checks) and a dual-database schema using MongoDB Atlas (Mongoose) and PostgreSQL (ACID transactions, rollback handling, and race-condition prevention). I also built CI/CD with GitHub Actions (Dockerized DBs, full test suite, coverage thresholds) and deployed to AWS using least-privilege IAM with EC2, ALB, and RDS—while delivering structured Jest/Supertest test suites and reliable integration-focused development.