Rafael S.

Senior Java backend engineer with 20 years of production experience. I build and maintain cloud-native services with Java 21, Spring Boot 3, Quarkus and Kotlin — architecture, implementation, migrations and long-term support. Current focus: • Java / Quarkus / Spring Boot microservices • Kotlin backends • High-performance and safety-critical services in Rust when latency or correctness matter • PostgreSQL, REST APIs, Docker, Kubernetes, CI/CD What I do on a project: • Design architecture and own delivery from scratch or on an existing codebase • Migrate legacy Spring / monoliths to Quarkus or Spring Boot 3 • Review, fix and stabilize systems written by others • Work solo or inside a team, including production support Also experienced with Linux (Ubuntu, RHEL/Fedora), containers and virtualization (Docker, Kubernetes, LXC, KVM). Other languages (Go, Python, C/C++) are available when the backend requires them — they are not my primary offer. Prefer long-term collaboration. Open to companies and individual clients. Comfortable with NDA. Available 30–60 hours per week. Rate $50/hr.