---
title: "Ian: Mobile & web developer"
description: "Portfolio of Ian Nery Bandeira, a senior product engineer in Brazil: case studies of the mobile apps he has built, from Character.AI to health and safety apps."
url: "https://ianbandeira.dev/"
language: "en"
---

# Ian Nery Bandeira

Hey! My name is Ian, I'm a developer based in Brazil. I like to build mostly mobile apps and I have a knack for design. And for talking too much.

Portfolio of Ian Nery Bandeira, a senior product engineer in Brazil: case studies of the mobile apps he has built, from Character.AI to health and safety apps.

- **Mobile & web developer**
- **Experience:** Senior Product Engineer, Character.AI (Nov 2025 – present)
- **Stack:** React Native, TypeScript, Next.js, Expo, React, Figma, Reanimated, Tailwind CSS, Zustand, Three.js
- [About](https://ianbandeira.dev/about.md)
- Email: [iannerybandeira@gmail.com](mailto:iannerybandeira@gmail.com)
- [LinkedIn](https://www.linkedin.com/in/iannery)
- [Résumé](https://ianbandeira.dev/Ian-Nery-Bandeira-Resume.pdf)

## Highlighted project

### [Character.AI](https://ianbandeira.dev/projects/character-ai.md)

Growth and monetization features for a conversational AI platform with ~15.5M monthly active users, across mobile and web.

- **Role:** Senior Product Engineer
- **Year:** 2026
- **Tech stack:** React Native, TypeScript, CI/CD, CodeQL
- [character.ai](https://character.ai)

- **CAI+ upsell in onboarding:** A subscription offer shown right after onboarding, one of the biggest monetization wins of the year.
- **Following tab:** A discovery feed for the creators you follow, with more users following creators.
- **Faster builds:** A CI/CD overhaul made cold builds about 57% faster and warm builds about 82% faster.
- **Shipped across mobile and web:** Recent Chat Tabs, block/unblock, Character Boost and Character Preset Wallpapers.

Stories:

- [Taming the keyboard](https://ianbandeira.dev/projects/character-ai/stories/taming-the-keyboard.md): Joining an app with millions of users, and unifying keyboard handling as my first big contribution.

## More apps

### [SoviHealth – Smart Diary](https://ianbandeira.dev/projects/sovihealth.md)

A smart health diary app I built from scratch at Techsquads, from prototype to deployment.

- **Role:** Technical lead
- **Year:** 2025
- **Tech stack:** React Native, Node.js, Firebase, Google Cloud

### [AegisApp – 911 & Security Helper](https://ianbandeira.dev/projects/aegis-app.md)

An emergency and personal security app I built and coordinated from scratch with a team of five. 200+ downloads in its first two weeks.

- **Role:** Technical lead · team of 5
- **Year:** 2024
- **Tech stack:** React Native, Node.js, AWS

### [Artisan Marketplace](https://ianbandeira.dev/projects/artisan-marketplace.md)

An app that helps artisans in situations of social vulnerability around the world sell their products.

- **Role:** Lead developer · team of 6
- **Year:** 2023
- **Tech stack:** React Native, Expo, EAS, TypeScript, Firebase

### [Moodmind – Smart Diary](https://ianbandeira.dev/projects/moodmind.md)

A smart diary that predicts stress from wearable physiological data via Bluetooth and Google Fit.

- **Role:** Senior software engineer · team of 8
- **Year:** 2023
- **Tech stack:** React Native

### [Playtestr – Playtest Support Tool](https://ianbandeira.dev/projects/playtestr.md)

A mobile tool that supports playtesting sessions, built at Flow Tecnologias Empáticas.

- **Role:** Senior software engineer · team of 8
- **Year:** 2023
- **Tech stack:** React Native

### [Prescription Signatures](https://ianbandeira.dev/projects/prescription-signatures.md)

A React Native app for controlling automatic prescription signatures in the Brazilian health system.

- **Role:** Researcher & software engineer
- **Year:** 2023
- **Tech stack:** React Native

### [ESVirtual](https://ianbandeira.dev/projects/esvirtual.md)

RD&I app with FAPDF/UNB/CNJ that geolocates social services for people leaving the prison system and integrates with SEEU for sentence monitoring.

- **Role:** Mobile developer · team of 18
- **Year:** 2022
- **Tech stack:** React Native, iOS, REST APIs

### [Trilha da Arquitetura e Arte](https://ianbandeira.dev/projects/trilha-da-arquitetura-e-arte.md)

An app for exploring the buildings and artworks of the University of Brasília campus.

- **Role:** Software engineer
- **Year:** 2022
- **Tech stack:** React Native