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SABBIR HASAN User

@sabbir_hasan

Message

I build Java Spring Boot ERP platforms with web and mobile clients.

Bangladesh

Message

What I'm looking for

I'm seeking Full-Stack or Backend Developer opportunities where I can discuss and build on the NexaERP codebase and architecture, delivering clean, maintainable business applications.

I built NexaERP, a production-style accounting and finance ERP, from the ground up using Java 21, Spring Boot, Angular, MySQL, and JWT. It includes 36 REST controllers, 27 Angular modules, multi-step approval workflows, recurring journal automation, bank reconciliation, RBAC, audit logs, six financial reports, Excel export, and 35+ automated tests.

I extended the shared REST API backend to Android through Java, MVVM, Retrofit, OkHttp, and Gson, and to Android and iOS through Flutter and Dart. I focus on clean architecture, maintainable code, and practical business solutions.

Experience

Work history, roles, and key accomplishments

Flutter Developer Self-Employed

self

Nov 2025 - Sep 2026 (10 months)

Developed a Flutter mobile client integrated with REST APIs, implementing authentication, API integration, navigation, state management, reusable UI components, and ERP-related workflows.

Flutter Dart REST APIs JWT Android Git

Android Developer — Self-Employed

self

Nov 2025 - Sep 2026 (10 months)

Developed an Android application using Java, MVVM architecture, Retrofit, and REST APIs. Implemented authentication, API integration, navigation, reusable components, and backend-connected application workflows.

Android Studio Android Android SDK

Java / Spring Boot Developer

Self Employed

Nov 2025 - Sep 2026 (10 months)

Developed a production-style ERP system from the ground up, including a multi-client platform serving Web, Android, and Flutter applications through a shared REST API backend. Built the double-entry Accounting & Finance module with 36 REST controllers and 27 Angular modules, and designed an approval workflow engine using the Adapter pattern.