Senior Java Software Engineer

Senior Java Developer (Credit Card Payment Systems)

Project-Based | Azerbaijan Banking Client

We are looking for an experienced Senior Java Developer to join a project for a major banking client in Azerbaijan. The role focuses on Credit Card Payment Systems, and requires strong expertise in Java and banking technologies.

Commitment: Minimum 6 months (project-based)

English Level: Upper-intermediate (fluent communication not required)

Experience: Minimum 6+ years Java, including 2+ years in the Credit Card domain

Notice Period: Maximum 2 weeks

Location: Primarily remote. During project onboarding, up to 3 weeks stay in Azerbaijan may be required. Accommodation + daily allowance of $160 will be provided.

Key Responsibilities

• Develop and maintain components related to Credit Card Payment Systems
• Work closely with the banking client on performance, reliability, and integration requirements
• Collaborate with cross-functional teams to deliver high-quality, scalable solutions
• Ensure code quality, stability, and adherence to industry standards

Required Qualifications

• Bachelor’s degree in Engineering or related analytical fields
• 6+ years of professional experience as a Java Developer (Must)
• 2+ years of experience in Credit Card domain (Must)
• Strong knowledge of banking core systems (Must)
• Proficiency in Java 17 or 21 and modern language features (Must)
• Hands-on experience with Spring Boot 3.x and the Spring ecosystem (Must)

Strong understanding of:

• Spring Web (REST APIs) (Must)
• Spring Data JPA (Hibernate), JDBC, QueryDSL/jOOQ (Must)
• PostgreSQL or Oracle including schema design, indexing, and optimization (Must)

Good to Have (Not Mandatory)

• gRPC integration
• Spring Cloud Gateway (routing, filters, auth handoff)
• Spring Security (OIDC/JWT, RBAC)
• Spring Batch (EOD, settlement, statement generation)
• Hibernate/JPA deep expertise
• Transaction management (ACID, isolation levels, distributed transactions)
• Query optimization and schema tuning
• MongoDB, Redis
• Apache Kafka (schema registry, partitioning strategy, idempotency)
• Event-driven patterns (outbox/inbox, saga orchestration)
• ISO-8583 or similar payment processing standards
• Resilience4j, connection pool tuning, backpressure
• mTLS, JWE/JWT, secrets management (Vault/KMS)
• PCI-DSS best practices
• OpenTelemetry, Prometheus, Grafana, ELK/OpenSearch
• JUnit 5, Testcontainers, contract testing tools
• Load testing (k6, Gatling)
• CI/CD pipelines, Docker, Kubernetes, Helm, SonarQube, SAST/DAST