# SABBIR HASAN User

SABBIR HASAN User is a remote worker on Himalayas, Flutter Developer Self-Employed at self, based in Bangladesh.

Source: https://himalayas.app/@sabbir_hasan

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

| Detail | Value |
| --- | --- |
| Availability | Open to opportunities |
| Location | Bangladesh |
| Authorized to work in | Bangladesh |
| Salary expectations | 30k-40k USD |
| Job categories | Software Engineer, Full Stack Developer, Java Developer, Spring Boot Developer, Mobile Software Developer, Android Developer, Flutter Developer, Backend API Developer, Backend Engineer, Backend Development, Backend Platform Developer, Backend Systems Developer, Remote Backend Developer, Python Backend Developer |
| Skills | Java, Spring Boot, Spring MVC, Spring Security, JWT, Hibernate Spring Data, Hibernate, REST API Development, MySQL, Angular, TypeScript, JavaScript, HTML5, Bootstrap, Android, MVVM, Retrofit, OkHttp, Flutter, Dart, Python, Node.Js Development, Oracle, SQL, Pl SQL, Firebase, RBAC, Repository Pattern, Git, GitHub, Postman, Junit, Apache POI, SPSS, R, Spring Data, NodeJS, IntelliJ IDEA, ES6, iOS, Android Studio, DBs, Instructor |
| Portfolio | https://github.com/md-sabbir-hasan |
| LinkedIn | https://https://www.linkedin.com/in/md-sabbir-hasan-041499388/ |
| GitHub | https://https://github.com/md-sabbir-hasan |

## What I'm looking for

```text
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.
```

## About

```text
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

### Flutter Developer Self-Employed

[self](https://himalayas.app/companies/github). Nov 2025 - Sep 2026

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

Skills: Flutter, Dart, REST-APIs, JWT, Android, Git

### Android Developer, Self-Employed

[self](https://himalayas.app/companies/github). Nov 2025 - Sep 2026

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

Skills: Android-Studio, Android, Android-SDK

### Java / Spring Boot Developer

[Self Employed](https://himalayas.app/companies/github). Nov 2025 - Sep 2026

```text
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.
```

Skills: Java, Spring-Boot, Spring-Security, JWT, JPA, Hibernate, REST-APIs, MySQL, Angular, Apache-POI, Android, Flutter, MVVM, Retrofit, OkHttp, Junit, Git, GitHub, IntelliJ-IDEA, Android-Studio, Postman

## Education

### Dhaka College (University of Dhaka)

Master of Science, Statistics

```text
Pursued a Master of Science in Statistics at Dhaka College, affiliated with the University of Dhaka, completing in 2024.
```

### Dhaka College (University of Dhaka)

Bachelor of Science, Statistics

```text
Completed a Bachelor of Science in Statistics at Dhaka College, affiliated with the University of Dhaka, in 2023.
```

### Dinajpur Adarsha College

Higher Secondary Certificate, Science

```text
Completed Higher Secondary Certificate (HSC) in Science from Dinajpur Adarsha College in 2019.
```

### Lahiri MLHS

Secondary School Certificate, Science

```text
Completed Secondary School Certificate (SSC) in Science from Lahiri MLHS in 2016.
```

## Tech stack

- Google Tag Manager
- Postman
- Retrofit
- GitHub
- Flutter
- DB
- Spring Data
- MySQL
- Node.js
- Spring Boot
- Spring MVC
- Google Analytics
- IntelliJ IDEA
- Android Studio
- React
- AngularJS
- JavaScript
- Python
- HTML5
- Java
- ES6
- CSS 3
- Dart
- iOS
- Firebase
- Spring Security
- TypeScript
- Visual Studio Code
- Docker
- SQL
- Instructor
- Android

To contact SABBIR HASAN, message them from this profile with a Himalayas employer account: [Hire on Himalayas](https://himalayas.app/hire).

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