Senior Backend Expert

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.