mobile

PresenGo - GPS Attendance Demo App

A technical showcase mobile application demonstrating GPS-based attendance with radius validation, camera verification, modular Clean Architecture, and Supabase backend integration.

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Role

Mobile Engineer (Flutter)

Team Size

Solo Developer

Duration

1 week (project duration)

Methodology

Architecture-Driven Development

Tech Stack

FlutterDartBLoCClean ArchitectureSupabaseOpenStreetMapGeolocatorGetItHydratedBlocPDF Generator

Project Overview

PresenGo is a demonstration mobile application built to simulate a real-world GPS attendance system. The app implements configurable radius validation, mandatory selfie verification, PDF reporting, and modular architecture using Clean Architecture and BLoC pattern. It was developed as a technical showcase to illustrate scalable Flutter engineering practices with Supabase backend services.

My Contributions

Designed and implemented full Clean Architecture structure (Presentation, Domain, Data layers)
Developed GPS radius validation logic with real-time distance calculation
Integrated selfie-based attendance verification with Supabase Storage upload
Implemented monthly PDF report generation with attendance summary and detail table
Configured Supabase Auth, database schema, and Row Level Security (RLS) policies

Challenges & Solutions

Key engineering problems I solved during this project.

Accurate and Reliable GPS Distance Validation

Implemented continuous location stream handling with geolocator and calculated real-time distance to determine whether users are within a configurable attendance radius.

Ensuring Attendance Authenticity

Integrated mandatory front-camera selfie capture and automatic upload to Supabase Storage to validate physical presence during clock-in/out.

Maintaining Scalable Code Structure

Applied Clean Architecture principles with BLoC state management and dependency injection using GetIt to ensure maintainability and testability.

Generating Structured Attendance Reports

Built a PDF export module that generates monthly attendance summaries with statistics and detailed records, including share functionality.

Outcome

The project serves as a technical reference implementation of a modular GPS-based attendance system. It demonstrates scalable architecture design, backend integration, and real-world feature simulation, making it suitable for engineering showcase and technical discussions.