Java Backend Developer — Blocksquare (via Remotesome)

About Blocksquare

Blocksquare is an award-winning team developing the world’s leading blockchain-based real estate tokenization system. Headquartered in Ljubljana, Slovenia (EU), we are developing a state-of-the-art system in close co-operation with Medius — the leading provider of enterprise software solutions in the region.

Who are we looking for

As a Java EE / Quarkus Backend Developer, you will play a crucial role in designing, developing, and maintaining our backend systems that power our tokenization platform.

Responsibilities

• Develop, maintain, and optimize backend applications using Java and Quarkus.

• Design and implement scalable, high-performance RESTful APIs and microservices.

• Work with databases (PostgreSQL, MySQL) using JPA and Hibernate.

• Implement secure authentication and authorization mechanisms (OAuth 2.0, JWT).

• Develop event-driven architectures using Kafka message broker.

• Collaborate with front-end developers and blockchain experts to build next-gen real estate tokenization solutions.

• Optimize performance and ensure high availability of services.

• Write unit and integration tests using JUnit, QuarkusTest

Requirements

• 3+ years of Java development experience (Mid-Level) / 5+ years (Senior).

• Strong knowledge of Java EE, Quarkus, and microservices architecture.

• Experience with REST API development and OpenAPI/Swagger documentation.

• Proficiency in JPA and Hibernate for database management.

• Experience with Docker and Kubernetes for containerized deployments.

• Familiarity with CI/CD pipelines (GitLab CI).

• Understanding of asynchronous processing and event-driven systems (e.g., Kafka, RabbitMQ).

• Strong problem-solving skills and ability to work independently.

Nice to have

• Experience with Quarkus Native Image (GraalVM) for performance optimization.

• Knowledge of blockchain technologies or real estate tokenization.

• Familiarity with GraphQL, WebSockets, and reactive programming.

• Experience working with NoSQL databases (MongoDB, Redis, etc.).

• Experience with JavaSrcipt or Typescript languages

• Understanding of financial services, smart contracts, or tokenization.

Required Skills

• Java — Advanced
• Quarkus — Intermediate
• Kafka — Nice to have

Benefits

• Fully Remote
• Flexible Hours

Compensation

€50K – €60K/year

Timezone: UTC+1 to UTC+4