Java Developer (Backend)

Design, develop, test, and maintain backend services and RESTful APIs using Java and Spring Boot.

• Build high-concurrency services using Java virtual threads on the Spring Boot servlet stack, with careful management of blocking I/O, database connection pools, and thread pinning.
• Implement core financial features such as wallet accounts, transfers, merchant payments, and transaction ledgers with strict attention to consistency, atomicity, and auditability.
• Design efficient PostgreSQL schemas, queries, and indexes; manage schema changes through versioned database migrations (Flyway).
• Integrate with external systems including banks, card schemes, payment processors, and third-party identity/KYC services.
• Apply secure coding practices and Spring Security standards for authentication, authorization, and protection of sensitive customer data.
• Contribute to and reuse shared internal libraries to ensure consistency in logging, configuration, and security across services.
• Write unit and integration tests; participate actively in code reviews and uphold team coding standards.
• Act as third-line (L3) escalation for production incidents on a rotating on-call basis: diagnose root causes, deliver fixes, and contribute to post-incident reviews.
• Package and deploy services in containerized environments (Docker, Kubernetes) on cloud infrastructure (AWS).
• Work within an Agile/Scrum process: estimate tasks, manage tickets in Jira, and deliver to sprint commitments.
• Produce and maintain clear technical documentation, API specifications, and Postman collections.