Java Backend Developer Expert (Core Card Systems)

Core Backend Development Strong expertise in designing and building RESTful APIs using Java Spring Boot. Proven experience with Java 8+ (Streams, Lambdas, Optional, Functional Programming). Deep understanding of software design patterns and microservices architecture. Messaging & Event-driven SystemsHands-on experience with Kafka and/or RabbitMQ.Database & Data Management Proficient in Oracle and PostgreSQL databases. Strong understanding of SQL optimization and transaction management. Caching & Performance Experience with Redis and caching strategies. Proven experience building high-performance backend systems processing billions of transactions/month. Monitoring & Logging Experience with ELK stack (Elasticsearch, Logstash, Kibana). Familiarity with Prometheus and Grafana. Cloud-native Development Experience with cloud platforms (AWS preferred). Familiarity with 12-Factor App principles. Development Practices Solid understanding of secure development practices. Proficient in Agile methodologies, Unit Testing, CI/CD pipelines. Soft Skills Strong communication and collaboration abilities. Team-oriented mindset; ability to mentor and support fellow engineers. Nice to Have Experience working in the banking / financial services domain. Background working with core card systems (credit card, debit card platforms). Experience collaborating with international card payment organizations (Visa, Mastercard, JCB, UnionPay). Experience working in a product development environment (building long-lived product lines). Hands-on experience with Load Testing tools: JMeter, JProfiler, Locust, k6. Familiarity with regulatory compliance and security standards in financial systems. Experience working with NoSQL databases such as MongoDB or Cassandra. Experience applying AI-powered tools and techniques to enhance productivity and accelerate project delivery.