SmartCore is a fintech holding building infrastructure for the next generation of payments. Our solutions cover the entire financial operations cycle - from core banking and processing to cards, wallets, and anti-fraud systems.

We are a leading fintech company developing innovative solutions in payment processing and anti-fraud technologies. We create high-tech products that are reshaping the financial landscape and are looking for true professionals ready to tackle complex and ambitious challenges.

About the Project:

You'll join a key team responsible for developing and evolving our core acquiring platform - a complex, high-load, microservices-based system operating 24/7. We handle the entire payment lifecycle, from initiation to clearing, ensuring minimal latency, high fault tolerance, and full compliance with strict security standards (PCI DSS).

What You'll Do:
- Design and develop new microservices and business logic using Kotlin and Java.
- Optimize the performance of existing system components and handle high-load areas of the codebase.




- Make key architectural decisions aimed at improving fault tolerance, scalability, and platform security.
- Integrate with third-party payment systems, banks, and processing centers.
- Work with asynchronous data streams using Kafka and RabbitMQ.
- Conduct code reviews, mentor less experienced colleagues, and promote best development practices.
- Actively participate in R&D; - exploring and integrating new technologies into the project stack.
- Write unit and integration tests to maintain a high-quality codebase.

Our Adecuado Candidate:
- Has at least 10 years of commercial backend development experience with Java/Kotlin.
- Demonstrates expert-level proficiency in Kotlin: understands idioms, coroutines, functional features, and applies them effectively.
- Possesses deep knowledge of Java Core and the JVM ecosystem.
- Has excellent command of Spring Boot - not only building REST APIs but also understanding its internals, auto-

📌 Senior Kotlin/Java (Barcelona)
🏢 SMARTCORE
📍 Barcelona