Senior Backend Engineer

About Us Zact is a Fintech innovator dedicated to a singular idea : Organizations need simpler expense and payment management systems that align the spending employee with finance and accounting while providing inherent guardrails and continuous reconciliation with financial systems. Zact enables all parts of the company to Pay by the Rules. Position Summary We are seeking an experienced Senior Backend Developer to join our engineering team. The ideal candidate will bring deep expertise in Java development and enterprise application architecture, with a proven track record of delivering scalable, secure, and maintainable solutions. Location Zact is a global company with multiple locations across US, Europe and India. We provide 100% Remote Working Option. Candidates applying for this role should be located in one of the European or Indian Time zones. Key Responsibilities Design, develop, and maintain enterprise-grade Java applications using Spring Framework and related technologies Architect and implement RESTful APIs following industry best practices and security standards Collaborate with cross-functional teams to gather requirements and translate them into technical specifications Mentor junior developers and contribute to technical decision-making Participate in code reviews and ensure code quality standards are maintained Troubleshoot and resolve complex technical issues in production environments Required Qualifications Minimum 5 years of Java development experience Strong expertise in Spring Framework ecosystem Deep understanding of RESTful API design principles and best practices Experience implementing various authentication and authorization models (OAuth 2.0, JWT, RBAC) Strong knowledge of relational databases and SQL Preferred Qualifications Experience with ESB implementations, particularly Apache Camel Experience with ETL frameworks and data integration patterns Knowledge of microservices architecture and distributed systems Familiarity with container technologies (Docker, Kubernetes) Experience with message brokers (Kafka, RabbitMQ) Technical Skills Languages: Java 8+, SQL Frameworks: Spring Boot, Spring Security, Spring Data JPA Integration: Apache Camel, REST APIs Databases: PostgreSQL, MySQL, or similar RDBMS Testing: JUnit, Mockito