Josue Valerio

I’m a Full Stack Developer focused on building and scaling SaaS platforms. I bring proven experience in secure architectures (JWT), AI model integration (Mistral AI), and relational database optimization (MySQL), with a strong emphasis on clean code under agile methodologies.

As an MVPX AI Intern, I developed the backend for a QR access engine using short TTL JWT validation to mitigate replay attacks. I helped achieve 99.9% uptime in automated deployments via GitHub Actions to Nginx servers, and I resolved critical synchronization failures by standardizing time zones (IANA) in TypeScript.

I also integrated the Stripe gateway by processing asynchronous webhooks in Node.js, automating membership updates in MySQL and eliminating 15+ weekly hours of manual administration. On the engineering side, I built optimized CRUD modules for inventory with date-indexed audit logs while ensuring Definition of Done (DoD) compliance in an agile environment managed with ClickUp.

At NutriDev SaaS, I designed and implemented 5+ RESTful modules in Node.js/Express and refactored complex MySQL queries using indexing and eager loading, reducing response latency in critical endpoints from 800ms to under 150ms. I integrated the Mistral AI API to automate nutritional plan generation, cutting diet creation time from 15 minutes to 2 minutes, and secured the system with JWT-based authentication and validation middleware.