💻 Backend Developer | Java | Spring Boot | AWS | Microservices I’m a backend developer with over 7 years of experience building scalable enterprise applications and APIs using Java, Spring Boot, and RESTful microservices. I’ve worked on projects in IoT, streaming, and fintech, focusing on performance, clean architecture, and cloud deployment with AWS and Docker. I’m passionate about solving complex backend problems, optimizing systems for scalability, and delivering high-quality, maintainable code.

Sam Sajjad Serajzadeh

💻 Backend Developer | Java | Spring Boot | AWS | Microservices I’m a backend developer with over 7 years of experience building scalable enterprise applications and APIs using Java, Spring Boot, and RESTful microservices. I’ve worked on projects in IoT, streaming, and fintech, focusing on performance, clean architecture, and cloud deployment with AWS and Docker. I’m passionate about solving complex backend problems, optimizing systems for scalability, and delivering high-quality, maintainable code.

Available to hire

💻 Backend Developer | Java | Spring Boot | AWS | Microservices

I’m a backend developer with over 7 years of experience building scalable enterprise applications and APIs using Java, Spring Boot, and RESTful microservices. I’ve worked on projects in IoT, streaming, and fintech, focusing on performance, clean architecture, and cloud deployment with AWS and Docker.

I’m passionate about solving complex backend problems, optimizing systems for scalability, and delivering high-quality, maintainable code.

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Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate

Work Experience

Software Engineer at Dotin
May 1, 2021 - Present
Developed and maintained a high-performance streaming platform serving over 1M daily users using Java (Spring Boot), React, and RESTful APIs. Optimized video streaming (HLS, MPEG-DASH, DRM) and backend logic for improved scalability and reliability. Collaborated with cross-functional teams in Agile environment to design and deploy microservices. Led integration of backend APIs with front-end applications and cloud infrastructure.
Java Backend Developer (IoT Platform) at Fanap Soft
March 1, 2023 - October 13, 2025
Developed scalable IoT backend platform to manage device monitoring and data analytics. Implemented microservices using Java 8 and Spring Boot to handle real-time telemetry data. Designed and deployed REST APIs, improving system reliability and performance by 30%. Worked closely with DevOps team on AWS-based infrastructure and CI/CD pipelines.
Java Backend Developer (Insurance Platform) at Dotin
February 1, 2022 - October 13, 2025
Designed and implemented backend services for an enterprise insurance management system using Java ( Spring Boot) and microservices architecture. Built RESTful APIs and integrated multiple modules including policy, claims, and customer data. Worked with PostgreSQL and Redis for high-performance data access and caching. Implemented Spring Security for authentication and authorization across services. Deployed services in Docker containers and optimized CI/CD pipelines using Jenkins. Collaborated with frontend teams using React and RESTful API integrations.
Java Web Developer at Radar Faratech
January 1, 2021 - October 13, 2025
Built backend systems for GPS vehicle management using Spring Boot and PostgreSQL. Integrated APIs for real-time communication and implemented data reporting services. Enhanced code quality and maintainability through refactoring and unit testing.
Developer at Eghamat24
October 1, 2019 - October 13, 2025
Developed hotel and flight booking system using Laravel and integrated backend data services. Designed data crawler and optimized algorithms for price recommendation and tour management.
Developer at Exir Software
December 1, 2017 - October 13, 2025
Built responsive web interfaces with HTML, CSS, and JavaScript. Developed backend logic in PHP and MySQL to support client applications.
Software Engineer at Dotin
May 1, 2021 - Present
Developed a high-performance streaming platform serving over 1M daily users using Java (Spring Boot), React, and RESTful APIs; optimized video streaming (HLS, MPEG-DASH, DRM) and backend logic for scalability and reliability; collaborated in Agile teams; led backend–frontend integrations and cloud infrastructure deployments.
Java Backend Developer (IoT Platform) at Fanap Soft
March 1, 2023 - October 13, 2025
Built scalable IoT backend to manage device monitoring and data analytics; implemented microservices with Java 8 and Spring Boot; designed REST APIs; improved reliability and performance by 30%; collaborated with DevOps on AWS-based infrastructure and CI/CD pipelines.
Java Backend Developer (Insurance Platform) at Dotin
February 1, 2022 - October 13, 2025
Designed backend services for enterprise insurance management using Java Spring Boot and microservices; built RESTful APIs and integrated policy, claims, and customer data modules; employed PostgreSQL and Redis for high-performance data access and caching; implemented Spring Security; Docker deployment; optimized CI/CD pipelines; collaborated with frontend teams.
Java Web Developer at Radar Faratech
January 1, 2021 - October 13, 2025
Built backend systems for GPS vehicle management using Spring Boot and PostgreSQL; integrated APIs for real-time communication; implemented data reporting services; refactored code for quality and maintainability.
Developer at Eghamat24
October 1, 2019 - October 13, 2025
Developed hotel and flight booking system using Laravel and integrated backend data services; designed data crawler and optimized algorithms for price recommendation and tour management.
Full Stack Developer at Exir Software
December 1, 2017 - October 13, 2025
Built responsive web interfaces with HTML, CSS, and JavaScript; developed backend logic in PHP and MySQL to support client applications.

Education

B.Sc. Computer Software Engineering at Islamic Azad University
January 1, 2011 - January 1, 2016
B.Sc. Computer Software Engineering at Islamic Azad University
January 1, 2011 - January 1, 2016

Qualifications

Machine Learning Boot Camp
January 11, 2030 - October 13, 2025
Top Research Student
January 1, 2016 - October 13, 2025
Outstanding Scientific Association President
January 1, 2016 - October 13, 2025

Industry Experience

Software & Internet, Media & Entertainment, Professional Services

Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate

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