Going public
Brother
An AI research assistant for Bible study and preparing talks. It answers from a large library of publications, and every quotation is checked against its source.
- Python
- LanceDB
- TypeScript
- MCP
- React
Jonatana Rabemananjara · Fullstack developer
I turn workflows that waste your time into systems that just run.
Web apps, Android apps, and the servers they run on. Writing code since I was 12, and available for freelance work, remote or local.
Selected work
In production
Wifi Efitrano
Community Wi-Fi where every person has their own login instead of one leaking password. FreeRADIUS in my homelab, plus a native Android admin app that disconnects devices instantly.
- Kotlin
- Compose
- Flask
- PostgreSQL
- FreeRADIUS
- Tailscale
Offline first
LibraryLite
A mobile reader that downloads publications once, unpacks them on the device, and keeps the catalogue current by detecting upstream changes.
- React Native
- TypeScript
- op-sqlite
- Maestro
Desktop app
Karaoke Broadcasting
Turns songs into karaoke videos: fetches the song and lyrics, removes the vocals locally, and renders the video with a per-syllable timing editor.
- Tauri
- Rust
- React
- Remotion
- Python
In development
Nofy
Pay-as-you-go AI images, video, and music from a mobile money wallet. Row-locked wallet, tested against double-spending, with automatic refunds.
- Bun
- Elysia
- Drizzle
- PostgreSQL
Runs hourly
MVola Wallet Sync
Scrapes my mobile money statements and syncs them into my budget app every hour. Idempotent, fills in missing fees, checks the balance.
- Python
- Playwright
- pytest
In use since 2023
Fandaharana
Turns program planning into print-ready A4 sheets for my community, replacing hand-made spreadsheets.
- React
- Tailwind
- TanStack
- PocketBase
And more
Many other projects
Most of my work lives in private repositories. I'm happy to walk through the code on request. A few are public:
How it started
As a kid I loved anything logical, like math and electronics. My first Android tablet changed everything: I poked at every corner until I rooted it, and ran through the courtyard shouting “MY TABLET IS ROOTED!”
Programming came through Minecraft. I opened a TNT mod, found JavaScript, and changed one number just to see what would happen. The tablet froze for seconds. Then Termux, then Python, learned on a friend's internet connection because we had none at home.
How I work
- 01Style and readability first, then scalability.
- 02Spot how a workflow can be simplified, then automate it.
- 03Every tool has to pass one test: is it sweet to use?
- 04Getting better at building with AI, every week.
Toolbox
Languages
- Python
- TypeScript
- Kotlin
Frontend
- React
- Vite
- Tailwind CSS
- TanStack Query
Backend
- FastAPI
- Node
- Bun/Elysia
- Strapi
- Next.js
Mobile
- Kotlin + Compose
- React Native
Data
- PostgreSQL
- SQLite
- Redis
- PocketBase
AI
- LLMs
- Embeddings
- RAG
- Vector DBs
Infra
- Docker
- GitHub Actions
- Nginx
- Cloudflare
- Tailscale
- MikroTik
Experience
2021 – 2025
Software Engineer, Code & Scale
Full-time, remote. Web and mobile apps with Next.js, Strapi, React Native.
2026
Translation department, Non-profit organization
Part-time.