~/john-guerra
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Hello, I'm John Guerra

Building secure, scalable applications that solve real problems

@RestController
public class Developer {
private final Service service;
Optional<String> result;
Stream.of(projects)
@Entity @Table

01. About Me

I'm a full stack software engineer focused on building responsive web applications and scalable backend systems. I enjoy solving complex problems, learning new technologies, and creating secure, production-ready applications that people find useful.

Technologies I work with:

Java Spring Boot JavaScript Python Docker MongoDB
Developer.java
1 @Getter
2 @RequiredArgsConstructor
3 public class Developer {
4   private final String name = "John Guerra";
5   private final String role = "Full Stack Engineer";
6   private final int experience = 2;
7 }

02. Projects

01

Wallet - Zero-Knowledge Password Manager

Live Demo GitHub

Built a zero-knowledge password manager using AES-GCM encryption and PBKDF2 key derivation, ensuring all sensitive data is encrypted in the browser before being sent to the server. Features secure passwordless login with email-based authentication, rate limiting, and session management.

Java Spring Boot JavaScript HTML CSS MongoDB Docker
02

SpikeTracker - Valorant Esports Tracker

Live Demo GitHub

Built a production-ready real-time Valorant match tracker using Spring Boot 3.5 and Java 21. Features WebSocket-powered live updates, PostgreSQL persistence, stream link scraping with JSoup, and comprehensive monitoring with Prometheus metrics. Includes responsive gaming-themed UI, rate limiting, and Docker deployment with CI/CD pipeline.

Java Spring Boot JavaScript HTML CSS Docker AWS
03

Dragonball Online Global - Volunteer

View Game

Contributed weekly patches addressing bugs and gameplay improvements. Resolved critical memory leaks in the asset loader and developed server-side anti-cheat features. Helped increase player satisfaction by ~40% and contributed to a 15% rise in active player count.

C++ C#

03. Get In Touch

I'm always open to discussing new opportunities, interesting projects, or just having a chat about technology. Feel free to reach out!

~/contact-info
$ cat email.txt
john@gekko.quest
$ open linkedin
linkedin.com/in/john-guerra20
$ git remote -v
github.com/GekkoQuest
$ _

Ready to build something amazing together?

Let's Connect