CASE STUDY / FLUTTER; BLOC; SQLITE

Local-first POS/invoice app with offline workflows, synchronization, PDF invoices, reporting/charts and Bluetooth thermal printing.

A point-of-sale and invoice app designed for local workflows, offline use and Bluetooth thermal printing.

BUILD FOCUSOffline-first POS & invoicing

ENGINEERINGFlutter

DELIVERYFlutter app

01 · PROJECT CONTEXT

The product challenge

Retail workflows need to continue when connectivity is unreliable and still produce printable invoices and useful reports.

MY CONTRIBUTION

Flutter implementation using BLoC and SQLite for local-first workflows, synchronization, PDF invoices, reports and printing.

02 · IMPLEMENTATION

Implementation & engineering decisions

01Built product/transaction workflows with local persistence.
02Used SQLite for offline data and synchronization-related flows.
03Generated PDF invoices and reporting/chart views.
04Integrated Bluetooth thermal printer support.

ENGINEERING NOTES

Where the implementation needed care

Architecture

Flutter with BLoC and SQLite supports local-first POS data, while PDF generation and Bluetooth printing cover invoice output.

Key challenge

Keep sales and invoice tasks usable when connectivity or printer conditions vary.

Delivered

POS workflows, offline persistence, invoice generation and printer integration.

03 · PRODUCT CAPABILITIES

Key features & flows

The implementation connects offline-first pos with sqlite persistence, supported by data synchronization and the integrations listed here.

Offline-first POS
SQLite persistence
Data synchronization
PDF invoices
Reports and charts
Bluetooth thermal printing

OFFLINE POSPDFBLUETOOTH

ARCHITECTURE & INTEGRATION

A local-first POS workflow continues through invoices and peripheral printing.

The Flutter app uses BLoC for state management and SQLite for local data. Invoice PDF generation, reporting/charts and Bluetooth thermal printing connect transaction records to practical checkout and reporting tasks; the supplied notes also call out synchronisation.

FlutterBLoCSQLitePDF generationBluetooth printing

HAVE A SIMILAR CHALLENGE?

Building something in offline-first pos & invoicing?

I can help shape the user journey, integration plan and delivery scope for a offline-first pos & invoicing product—from implementation through release.

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