Jelena Stefanovic

What I'm looking for

I look for a remote-first team focused on high-quality systems, clean architecture, and strict testing discipline (TDD). I thrive in a collaborative engineering culture handling complex backend logic. My goal is to take ownership of Spring Boot microservices, deliver production-ready code, and build a reliable remote B2B contract partnership.

Java Backend Engineer specializing in Spring Boot, Hibernate, and scalable microservices architectures. My career is focused on delivering high-performance financial technologies and secure backend ecosystems for international clients.

🚀 Professional Milestones:

Fintech Operations (Payoneer): Built and scaled core backend services handling critical client onboarding, registration, and identity validation workflows. Successfully integrated complex external payment providers and designed efficient caching strategies that significantly drove down API operational costs.
Enterprise Solutions (Kirey d.o.o.): Developed production-ready features using the Spring ecosystem, engineering highly performant REST APIs and optimizing data persistence layers.
Independent Architecture & Innovation: Designed and launched a production-grade Book Publishing Platform featuring stateless JWT authentication via Spring Security, modular controller-service-repository design, and a fully containerized local environment using multi-stage Docker builds. Fully covered with robust unit and integration tests (JUnit/Mockito, MockMvc) to ensure zero-downtime reliability.

🛠 Expertise & Systems Design:

Backend & Data: Java, Spring Boot, Spring Security, JWT, PostgreSQL, Hibernate/JPA.
Messaging & DevOps: Real-time data streaming via Apache Kafka, Docker (containerization & orchestration).
Quality Assurance: Test-Driven Development (TDD) culture, isolated H2 testing, and Mockito.

I thrive in fast-paced remote environments and am looking to join a high-impact engineering team or drive a remote B2B contract engagement.