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Harsha Apoorv
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SOLO · APR – JUN 2026FULL STACK · MOBILE · BACKEND

NotesApp: a notes app I took from schema to signed APK

A React Native app on top of a FastAPI backend I designed, secured and deployed myself. Two repos, one product, every layer mine.

SHIPPED!
Download APK v1.0.0 (opens in a new tab)App code (opens in a new tab)API code (opens in a new tab)Live API docs (opens in a new tab)

  • 18REST endpoints

  • 15Alembic migrations

  • 2sign-in paths: Google OAuth + email OTP

  • v1.0.0signed Android release

01

The app

NotesApp home screen listing notes
Home
Creating a note with rich text
Create a note
A note showing a formatted code block
Code blocks
Exporting notes to Excel
Excel export
Sign-up screen with Google sign-in
Sign up
No internet connection screen
Offline state
02

What I built

Auth done properly

Email and Google sign-in sharing one session layer, email OTP verification and password recovery, and JWTs with automatic refresh-token rotation.

Rich-text editor

A markdown-inspired editor with headings, links, lists, quotes and language-aware code blocks, plus a built-in formatting guide.

Excel export

Notes exported to a spreadsheet, with task status tracking from pending to in progress to completed.

Config API

App version checks, force updates, maintenance mode and the About and Privacy pages all come from the server, so behaviour changes without a release.

Schema that evolves

PostgreSQL with SQLAlchemy and 15 Alembic migrations, so every change to the database is versioned.

Shipped, not just coded

API on Render with Neon Postgres and Resend for email; the Android APK on GitHub Releases; MIT licensed.

03

Under the hood

NotesApp backend banner listing its stack
The backend
NotesApp backend architecture diagram
Backend architecture
Authentication flow diagram
Authentication flow
Database entity relationship diagram
Database design
04

What it taught me

  • Designing reusable auth flows so two sign-in methods share one session layer
  • Structuring a React Native codebase by feature, with shared components and centralized API services
  • Building and versioning a production REST API and its database
  • Preparing an app and an API for cloud deployment and a public release

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