Juan Santos Pimentel

About Me

Software Developer specializing in backend architecture and cybersecurity, with a strong technical foundation in Java (Spring Boot) and Node.js (NestJS). I focus on building scalable, secure, and high-performance solutions. My experience ranges from migrating legacy systems to microservices to developing real-time security protocols. Dedicated to continuous learning, I hold recent certifications in Cloud Computing (AWS/Azure) and Ethical Hacking, aiming to deliver robust software that drives business value.

Technical Skills

Backend & API

Java (Spring Boot 3) NestJS (Node.js) Microservices REST & SOAP Hibernate / JPA Flyway

Security & Cloud

Spring Security / JWT Ethical Hacking AWS / Azure / GCP Docker & Compose Linux

Frontend & Tools

JavaScript (ES6+) React Angular HTML5 / CSS3 Git / GitHub

Data & Reporting

PostgreSQL MySQL SQL Server Apache POI (Excel)

Featured Projects

Portfolio Hub

Enterprise Backend

Enterprise-level backend with Spring Boot 3. Features JWT security, Flyway migrations, and Google Drive API integration for cloud file storage. Includes a public API for profile exposure.

Java 17Spring BootFlywayGoogle Drive APIPostgreSQL

Source Code Demo Front Demo Back

Frontend: endearing-blini-6a6b91.netlify.app

Backend: portfolio-api.studios-tkoh.online

Repo: github.com/LavenderEdit/Portfolio

Patreon DRM Security

Security Middleware

Specialized security system built with NestJS. Validates Patreon subscriptions in real-time via WebSockets and manages session federation to protect digital assets from unauthorized access.

NestJSTypeScriptWebSocketsAuth Federation

Source Code Demo Backend

Backend: verification-patreon-1.onrender.com

Repo: github.com/LavenderEdit/drm-patreon-backend

Kardex Pro API

Inventory System

Transactional inventory management system. Ensures stock integrity through atomic movement records. Includes automated Excel reporting (Apache POI) and decoupled architecture.

Spring BootApache POITransactionalJS Vanilla

Back Code Front Code Demo Front Demo Back

Frontend: lavenderedit.github.io/product-management-app

Backend: kardex-pro.studios-tkoh.online

Repo: github.com/LavenderEdit/product-management-api

Ataraxia API

SaaS Backend

Productivity SaaS backend designed for high availability. Manages tasks, Pomodoro timers, and user settings. Features a robust 'Guest Mode' to reduce onboarding friction.

NestJSTypeORMPassport JWTMySQL

Source Code Demo Front by VaCris Demo Back

Frontend: ataraxia-timer.onrender.com

Backend: ataraxia-api.studios-tkoh.online/api/

Repo: github.com/LavenderEdit/ataraxia-api

Grading System API

EdTech

Complex educational assessment platform. Manages activity templates, student assignments, and score history tracking with a strict layered architecture and DTO pattern.

Java 17Spring SecurityMapStructDocker

Source Code Demo Backend

Backend: grading-api.studios-tkoh.online

Repo: github.com/LavenderEdit/grading