Meisam Sabzi

Working on core banking services, contributing to transaction-processing components in a large-scale banking platform. Building multithreaded Java components to handle concurrent transaction workloads reliably and improve throughput. Developing JasperReports-based document generation pipelines that populate Word templates from structured input data and convert outputs to PDF for downstream business use. Ramping up on an existing microservice codebase and contributing to production changes within the first two months using the team’s established engineering practices.

Developed backend services for a digital Rial wallet platform, including real-time balance management and wallet/transaction operations at scale. Built the core wallet service using Spring WebFlux to enable non-blocking, high-concurrency processing of financial transactions. Led a full database migration between two database systems with zero data loss and minimal downtime. Implemented Redis caching for wallet balances and frequently accessed financial data to reduce database load and improve response times. Implemented secure authentication and authorization using Keycloak and Spring Security with RBAC for sensitive endpoints. Built and documented RESTful APIs using Swagger/OpenAPI and applied SOLID/clean architecture practices for maintainability.

Delivered end-to-end backend solutions for multiple clients using Java and Spring Boot, including requirements gathering, API design, implementation, and deployment. Built and documented RESTful and SOAP-based services with Swagger/OpenAPI to provide clear integration contracts for frontend teams. Implemented JWT-based authentication and role-based access control with Spring Security across multiple projects. Designed inter-service communication using Spring Cloud (API Gateway, Eureka, OpenFeign). Optimized PostgreSQL schemas and indexing for read performance using complex queries. Containerized deliverables with Docker (including multi-container setups using Docker Compose) to ensure consistent environments across development and production.