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I’m Meisam Sabzi, a Java backend engineer with 5+ years of experience building secure, scalable microservices for enterprise and fintech systems. I’ve worked on high-throughput transaction processing, wallet and balance operations, and production-ready service development using Spring Boot, Spring Security, and Spring Cloud tooling. I enjoy designing clean, maintainable architectures using SOLID and Clean Architecture principles, and I’m hands-on with performance and reliability improvements such as Redis caching and query optimization. I also build automated document generation pipelines (JasperReports producing Word/PDF outputs) and have implemented authentication/authorization with Keycloak and RBAC to protect sensitive APIs.…I’m Meisam Sabzi, a Java backend engineer with 5+ years of experience building secure, scalable microservices for enterprise and fintech systems. I’ve worked on high-throughput transaction processing, wallet and balance operations, and production-ready service development using Spring Boot, Spring Security, and Spring Cloud tooling. I enjoy designing clean, maintainable architectures using SOLID and Clean Architecture principles, and I’m hands-on with performance and reliability improvements such as Redis caching and query optimization. I also build automated document generation pipelines (JasperReports producing Word/PDF outputs) and have implemented authentication/authorization with Keycloak and RBAC to protect sensitive APIs.

Meisam Sabzi

Back-End Developer, Software Engineer, Programmer, +2

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I’m Meisam Sabzi, a Java backend engineer with 5+ years of experience building secure, scalable microservices for enterprise and fintech systems. I’ve worked on high-throughput transaction processing, wallet and balance operations, and production-ready service development using Spring Boot, Spring Security, and Spring Cloud tooling. I enjoy designing clean, maintainable architectures using SOLID and Clean Architecture principles, and I’m hands-on with performance and reliability improvements such as Redis caching and query optimization. I also build automated document generation pipelines (JasperReports producing Word/PDF outputs) and have implemented authentication/authorization with Keycloak and RBAC to protect sensitive APIs.…I’m Meisam Sabzi, a Java backend engineer with 5+ years of experience building secure, scalable microservices for enterprise and fintech systems. I’ve worked on high-throughput transaction processing, wallet and balance operations, and production-ready service development using Spring Boot, Spring Security, and Spring Cloud tooling. I enjoy designing clean, maintainable architectures using SOLID and Clean Architecture principles, and I’m hands-on with performance and reliability improvements such as Redis caching and query optimization. I also build automated document generation pipelines (JasperReports producing Word/PDF outputs) and have implemented authentication/authorization with Keycloak and RBAC to protect sensitive APIs.

Available to hire

I’m Meisam Sabzi, a Java backend engineer with 5+ years of experience building secure, scalable microservices for enterprise and fintech systems. I’ve worked on high-throughput transaction processing, wallet and balance operations, and production-ready service development using Spring Boot, Spring Security, and Spring Cloud tooling.

I enjoy designing clean, maintainable architectures using SOLID and Clean Architecture principles, and I’m hands-on with performance and reliability improvements such as Redis caching and query optimization. I also build automated document generation pipelines (JasperReports producing Word/PDF outputs) and have implemented authentication/authorization with Keycloak and RBAC to protect sensitive APIs.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Language

Work Experience

Java Backend Developer at Sadad

July 1, 2026 - Present

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.

Java Backend Developer at IranKish

November 1, 2025 - April 30, 2026

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.

Freelance Backend Developer

January 1, 2025 - October 1, 2025

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.

Freelance Backend Developer at Freelance (Remote)

January 1, 2025 - October 31, 2025

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 web services with Swagger/OpenAPI to provide clear integration contracts for client frontend teams. Implemented JWT-based authentication and RBAC using Spring Security. Architected inter-service communication using Spring Cloud components such as API Gateway, Eureka, and OpenFeign for declarative HTTP clients between microservices. Designed and optimized PostgreSQL schemas with indexing and complex queries for improved read performance. Containerized deliverables using Docker and managed multi-container setups with Docker Compose.

Java Backend Developer at Scooba

September 1, 2020 - September 1, 2024

Developed and maintained backend microservices in a distributed architecture. Implemented authentication/authorization using Spring Security. Designed and maintained RESTful APIs used by web and mobile clients. Improved API performance by ~30% through query optimization and refactoring. Worked with Spring Cloud technologies including API Gateway, Eureka, OpenFeign, and Config Server.

Java Backend Developer at APA

April 1, 2020 - December 1, 2020

Designed and developed a QR code-based login solution inspired by WhatsApp Web authentication. Integrated backend services with frontend applications via RESTful APIs.