SmartCore in Barcelona leads fintech payments infrastructure and seeks a senior backend engineer to evolve its core platform. You design microservices in Java/Kotlin, optimize high-load components, and drive fault tolerance, scalability, and security with Spring Boot, PostgreSQL, and distributed systems patterns.
You will integrate with banks and payment systems, and work with Kafka, RabbitMQ, and Redis. You will mentor peers, participate in R&D;, write tests, and own code quality in a