// Hi, I'm Nelson
● Available for remote work
Featured Project
DM AI
wip
AI-powered Dungeon Master — generates interactive stories and adventures from your prompts. Bilingual (EN/ES). Built as a free alternative to Dungeon AI, powered by the Gemini API. Backend built with Java and Spring Boot.
Backend developer based in Spain — Java, Spring Boot, REST APIs, Spring Security, JPA/Hibernate, Docker, AWS. I build layered architectures with real security and persistence, and I deploy and self-host everything on my own VPS. Before software development I completed a technical degree in IT Systems & Networking — networks, servers, Linux, infrastructure from scratch. That foundation shows up in how I work: I understand the full stack, not just the code. Open to remote opportunities.
see my projects
DM AI
wip
AI-powered Dungeon Master — generates interactive stories and adventures from your prompts. Bilingual (EN/ES). Built as a free alternative to Dungeon AI, powered by the Gemini API. Backend built with Java and Spring Boot.
Project name
—
What it does · Tech used · What makes it interesting
Project name
—
What it does · Tech used · What makes it interesting
Project name
—
What it does · Tech used · What makes it interesting
Languages
Java 21
Rust
SQL
Backend
Spring Boot
Spring Security
JPA / Hibernate
MySQL
PostgreSQL
SQL Server
Maven
Swagger
JUnit 5
Mockito
Lombok
Redis
Infra & DevOps
Docker
Docker Compose
Linux VPS
AWS EC2/S3/VPC
GitHub Actions
Nginx
Apache
Debian Server
Ubuntu Server
SSH
Networking and Systems SMR
TCP/IP
DNS
DHCP
Cisco Packet Tracer
Windows Server
Active Directory
LAN/WAN
Routing and Switching
Virtualization
Assembly and Hardware
Architecture & Patterns
Microservices
REST APIs
DDD
Layered / n-Tier
JWT / OAuth2
Kafka
Tools
Git
GitHub
IntelliJ
Postman
VS Code
SSMS
Open to backend opportunities in Spain or remote — available now.
curriculum vitae
download ↓
nelson@nelsonffkarlsson.com
copy ↗
github.com/NUXX-G
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linkedin · Nelson Filipe Fardilha Karlsson
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