Emanuel Quimper's blog

I build software.I write what I learn.

I'm Emanuel, an AI-native product engineer in Québec. I work at App&Flow and write about mobile, web, and backend software.

Emanuel Quimper in a graphite and volt editorial portrait

Writing

Selected from the archive.

Sep 2026aiMy AI Coding Setup Is a Workflow, Not a Tool ListHow I divide real coding work between Grok, Claude, and Codex, and use cmux to keep the sessions organized.

Oct 2019jestCreate and Test a Hook in React-NativeReact Hooks are awesome, but how can we test them? How can we build Hook and use Native API in React-Native?

Oct 2019jestTable driven test with jestHow can we use table driven test with jest. How can that make your life easier.

Nov 2019nodejsGolang Rest API for NodeJS developer - IntroHow to create a Golang Rest API coming from a NodeJS background

Writing archive

published notes

Things I learned by building.

Experiments, tutorials, and hard-earned notes from the software I have worked on.

Browse the full archive

Kettlebell Protocol active EMOM workout with a 55 second timer, exercise order, and round progress

Kettlebell Protocol session builder with rearrangeable training blocks and a 25 minute duration estimate

Kettlebell Protocol

An offline-first training log for deliberate kettlebell practice.

TinyTirelire parent overview showing total family pocket money and the balance for each child

TinyTirelire child view showing progress toward a blue bike savings goal

TinyTirelire

Pocket money that grows with kids.

FrontDoor+

An event ticketing platform for online sales, on-site payments, ticket scanning, and live reporting.

My contribution: Contributed to the mobile app, web app, and backend.

Fin

A mobile wallet for sending and receiving digital dollars and moving money to a bank account.

My contribution: iOS and Android app development.

Dartwords

A daily word game where Darty gives you clues to help you guess the secret word.

My contribution: Web and mobile development. Established an AI-native engineering workflow, orchestrating coding agents for implementation, testing, and code review.

Open source

React Native EaseA lightweight animation library with a declarative API powered by Core Animation on iOS and Animator on Android.React Native Google AutocompleteA render-props library that keeps Google autocomplete behavior independent from the interface around it.React Native Design UtilityA small utility for building consistent design systems and responsive styling in React Native.

Emanuel Quimper smiling in a graphite and volt portrait

A personal note

Hi, I’m Emanuel.

I’m a developer in Québec and a former member of the Canadian Forces.

I write to think more clearly, remember what I learn, and help the next developer who runs into the same problem.

Today I build mobile apps, web experiences, and backend systems with an AI-native workflow across research, code, testing, and release.