Job Description

Senior Backend Expert (Java / Spring Boot)
📍 Remote | Austria-based project | 10–15 days/month
📅 Start: August 2026 | ⏳ 3–4 months | B2B

For one of our clients, we are currently looking for an experienced Senior Backend Expert to support a strategic transformation project in the area of Geographic Information Systems (GIS).

The initiative focuses on modernizing a legacy Oracle-based system into a cloud-native microservices architecture based on Java / Spring Boot, PostgreSQL and Kubernetes

The selected expert will act as a technical authority, working closely with internal architects and the engineering team to review, challenge, and strengthen the current solution before scaling development internationally.

Your responsibilities:

• Review and challenge existing microservices architecture

• Validate service boundaries, API design, and data ownership

• Identify architectural risks, bottlenecks, and anti-patterns

• Support decoupling from Oracle-based legacy architecture (no direct JDBC access)

• Contribute to and review architectural documentation (Arc42, DACI)

• Design, review, and optimize Java/Spring Boot APIs

• Assess API scalability, resilience, and code quality

• Review event-driven integration patterns (e.g. Kafka, mapping services, GIS databases)

• Evaluate latency, idempotency, and system reliability

Your profile:

• Strong experience with Java / Spring Boot microservices

• Proven background in software architecture design and technical reviews

• Experience with Oracle and/or PostgreSQL databases

• Knowledge of event-driven architectures (Kafka, outbox pattern)

Nice to have:

• Experience in GIS / geospatial systems

• Familiarity with routing, geocoding or geospatial APIs (e.g. HERE)

• Experience with Kubernetes environments

If you are interested in a short-term, high-impact architecture role in an international environment, we would be happy to hear from you.