Croatian Instant Payments System

Challenge

The Croatian Instant Payments System, developed and operated by Fina, has evolved into a critical financial infrastructure component since its 2020 launch. In preparation for the 2025 regulatory requirements and the expected expansion of participating banks and transaction volumes, Fina engaged Kodilion to deliver key system upgrade activities across architecture, development, integration, and performance optimization.

Project Goals

01

Lower Transaction Processing Time

Maximum time for the end-to-end transaction must be reduced from 10 to 5 seconds.
02

Increase Transaction Throughput

Participation becomes obligatory for all banks, so capacity must rise to meet the future transaction volume.
03

Increase System Resiliency

The system must remain stable under loads exceeding its nominal capacity.

Solution

Kodilion acted as a core delivery partner, providing expertise in the initial strategic workshops, as well as the technical backbone for the system’s evolution. By combining deep domain knowledge with proven engineering techniques, we supported the modernization of the system across architecture, development, integration, and performance optimization.

Our contribution helped strengthen the platform’s ability to support broader market participation, increasing transaction demand, and new regulatory and business requirements, while keeping the solution aligned with Fina’s ownership, operational model, and long-term system roadmap. The resulting architecture is built to scale alongside the evolving demands of the European payments landscape.

Project Deliveries

01

Significantly Optimized Transaction Processing Time

Transaction processing time was reduced to well under 5 seconds, even in high load situations.
02

Transaction Throughput Enhanced

Throughput was significantly upgraded: from 50 to 200 transactions per second.
03

Vastly Improved System Resiliency

New failsafes and throttling mechanisms were implemented, ensuring stability in high load situations.

Tech & Business

Technologies & Architecture: Java, Spring Boot, MyBatis, Flyway, JMS, Thymeleaf, Bootstrap, JAXB / Jakarta XML Bind

Platforms & Infrastructure: IBM WebSphere, IBM DB2, IBM MQ, Docker, Jenkins

Testing & Performance: JMeter, Gatling

Business Standards: SEPA Instant Payments Rulebook, ISO 20022, Verification of Payee, EU eIDAS, EU DSS

Environment: FINA instant payments infrastructure / Croatian Instant Payments System

After architecting and building the system back in 2020, this was a truly major overhaul. I’m happy that it is now ready for the rising volume of transactions, and particularly pleased with the stability we achieved.

— Hrvoje Slaviček, Solution Architect, Kodilion