~/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 real-time Valorant match tracker using Spring Boot 3.2 and the VLR.gg API. Features responsive web interface and Discord bot integration with JDA 5.x for automated match updates and score notifications. Fully containerized with Docker.

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