Backend engineer with deep expertise in Java, Go, and Rust, focused on distributed systems and large-scale modernization. At Itaú Unibanco — one of Latin America's largest banks — I lead the transformation of legacy monoliths into resilient, scalable microservices.
Beyond my day job, I'm a committer on Apache TomEE and contributor to Jakarta EE, MicroProfile, and EclipseEE4J — actively shaping the future of enterprise Java.
Currently on a journey learning Rust 🦀 — exploring memory safety, testing, and systems programming.
☕ Java
public class DanielDias implements SoftwareEngineer {
private final String employer = "Itaú Unibanco";
private final String oss = "Apache TomEE Committer | Jakarta EE & EclipseEE4J Contributor";
private final String focus = "Distributed Systems · Clean Architecture · Open Source";
private final String learning = "Rust 🦀";
private final String[] stack = {"Java", "Go", "Rust"};
@Override
public String passion() {
return "Building software that evolves with the business — clean, simple, maintainable.";
}
}🐹 Go
package main
import "fmt"
type SoftwareEngineer interface {
passion() string
}
type DanielDias struct {
employer string
oss string
focus string
learning string
stack []string
}
func (d DanielDias) passion() string {
return "Building software that evolves with the business — clean, simple, maintainable."
}
func main() {
daniel := DanielDias{
employer: "Itaú Unibanco",
oss: "Apache TomEE Committer | Jakarta EE & EclipseEE4J Contributor",
focus: "Distributed Systems · Clean Architecture · Open Source",
learning: "Rust 🦀",
stack: []string{"Java", "Go", "Rust"},
}
fmt.Println(daniel.passion())
}🦀 Rust
trait SoftwareEngineer {
fn passion(&self) -> &'static str;
}
struct DanielDias {
employer: &'static str,
oss: &'static str,
focus: &'static str,
learning: &'static str,
stack: [&'static str; 3],
}
impl SoftwareEngineer for DanielDias {
fn passion(&self) -> &'static str {
"Building software that evolves with the business — clean, simple, maintainable."
}
}
fn main() {
let daniel = DanielDias {
employer: "Itaú Unibanco",
oss: "Apache TomEE Committer | Jakarta EE & EclipseEE4J Contributor",
focus: "Distributed Systems · Clean Architecture · Open Source",
learning: "Rust 🦀",
stack: ["Java", "Go", "Rust"],
};
println!("{}", daniel.passion());
}| Layer | Technologies |
|---|---|
| Languages |    |
| Frameworks |     |
| Messaging |    |
| Data |    |
| Infra |      |
| Testing |    |
| Principles | DDD Clean Architecture SOLID Hexagonal Event-Driven |
Open source is where I give back to the community that shaped my career.
| Project | Role | Description |
|---|---|---|
| Apache TomEE | ✅ Committer | Enterprise Java runtime — core features, bug fixes & DX |
| Apache TomEE Site | ✅ Committer | Official TomEE documentation & website |
| Jakarta MVC | 🤝 Contributor | Jakarta MVC specification |
| Eclipse Krazo | 🤝 Contributor | Reference implementation of Jakarta MVC |
| Apache DeltaSpike | 🤝 Contributor | CDI extensions for Jakarta EE |
- 🏦 Itaú Unibanco — Modernizing large-scale financial systems: decomposing monoliths into microservices with DDD, Clean Architecture, Kafka and Apache Camel
- ⚙️ API Design — Designing RESTful APIs for high-throughput, low-latency financial services
- 📊 Observability — Full observability with Datadog: metrics, distributed traces, dashboards and alerts
- ☁️ AWS Infrastructure — EC2, ECS, S3, RDS; infrastructure-as-code with Terraform
- 🔁 CI/CD — Building and maintaining delivery pipelines with Jenkins
- 📨 Distributed Messaging — Event-driven architectures with Kafka, Camel and Apache Pulsar (Java producers + Go consumers)
- 🛡️ Performance Tuning — Profiling and optimizing Java services under high load in production
Writing about Java, Go, Rust, and distributed systems
2026
| Post | Tags | |
|---|---|---|
| 🦀 | Testing in Rust — From Java and Go to Crates and Modules | Rust |
| 🦀 | My Journey Learning Rust | Rust |
| 📊 | A Beginner's Journey into HTTP, Load Testing, and Observability | Observability |
| 🌐 | Becoming an Open Source Contributor with Apache TomEE | OSS Java |
2025
| Post | Tags | |
|---|---|---|
| ☕ | Java Talks, Go Listens: My First Apache Pulsar App | Java Go Pulsar |
| 📦 | Using Jakarta Data with Apache TomEE: A Step-by-Step Tutorial | Java OSS |
➡️ All posts on Blog · Medium
