Razvan Zanc

I am a hands-on Java Software Architect and Backend Performance Consultant with extensive experience designing, optimizing, and operating secure, scalable, and highly available systems in complex enterprise environments.

My core expertise includes Java, Quarkus, PostgreSQL, PgBouncer, Kubernetes, cloud-native architecture, microservices, performance engineering, application security, observability, and production incident analysis.

I help companies solve challenges such as:

• Slow APIs and backend bottlenecks

• PostgreSQL connection exhaustion

• Inefficient transaction boundaries

• Poor database and connection-pool configuration

• Scalability issues in Kubernetes environments

• Production instability and recurring incidents

• High-availability and resilience gaps

• Security challenges involving TLS, mTLS, PKI, and HSM integrations

• Architecture decisions that affect long-term maintainability and cost

In my current work within the German healthcare sector, I contribute to critical backend systems used at national scale. My work has included increasing system throughput by optimizing database connection management, redesigning PostgreSQL job queues, parallelizing background processing, reducing API response times through query and index optimization, and improving observability and production diagnostics.

I also have strong experience in technical leadership, mentoring, architecture reviews, and aligning engineering decisions with business needs.

I am available for:

• Backend performance audits

• Java and PostgreSQL architecture reviews

• Production-readiness assessments

• High-availability and scalability consulting

• Security architecture reviews

• Incident analysis and prevention planning

• Fractional software architecture support

• Part-time technical advisory engagements

• Corporate training and mentoring