Ferran Negre Pizarro

Hi, I'm Ferran.

Staff Software Engineer shipping mobile apps. I specialize in React Native and go deep into native iOS and Android when it matters. I'm obsessed with quality and the small details users notice, and I enjoy setting technical direction and helping the engineers around me grow.

Staff Software Engineer shipping mobile apps with React Native, going deep into native iOS and Android when it matters. I set technical direction and obsess over quality and the small details.

live app usersusersyesterday

Products

live app usersusersyesterday

Health & fitness apps on the App Store and Google Play.

FitHero app icon

FitHero

Jun 2019 · iOS & Android

Gym workout tracker. Log sets, reps and weights in seconds. Watch your progress build.

App StoreGoogle PlayWebsite
FlexHero app icon

FlexHero

Aug 2026 · iOS & Android

Five-minute daily stretching & mobility routines. Move better, feel less stiff, keep showing up.

App StoreGoogle PlayWebsite
CalHero app icon

CalHero

May 2026 · iOS & Android

Yes, a calorie tracker. Meals and macros without the clutter, built the way I wanted one.

App StoreGoogle PlayWebsite

How I work

13 years writing code by hand. Now I also run a software factory of agents.

Me · anywhere
MacBook Pro M4Ferran
MacBook Pro M4 48 GB · 1 TBhuman in the loop: engineering & taste
Running
Mac mini M4
Alfred
Mac mini M416 GB · 256 GBmy personal assistant & agent orchestrator
Mac mini M5 ProMac mini M5 Pro64 GB · 2 TBheavy lifting: writing code & running simulators
421commits
45pull requests

last 30 days

Me · anywhere
Running
MacBook Pro M4
Ferran
MacBook Pro M4 48 GB · 1 TBhuman in the loop: engineering & taste
Mac mini M4
Alfred
Mac mini M4 16 GB · 256 GBmy personal assistant & agent orchestrator
Mac mini M5 Pro
Mac mini M5 Pro 64 GB · 2 TBheavy lifting: writing code & running simulators
421commits
45pull requests
last 30 days

A bug, on the go

  1. MeI spot a bug on my phone and screenshot it to Telegram.
  2. M4The orchestrator writes up the issue and picks an agent.
  3. Until approvedM5 ProAn agent fixes it and tests it on a real device.
  4. M5 ProA second agent reviews the fix.
  5. MeI review and merge the PR on my phone.
  6. M5 ProTriggers an over-the-air (OTA) update.

Writing a feature

  1. MeI plan the spec: edge cases and the tests I want.
  2. M4The orchestrator picks the agent and sizes the work.
  3. M5 ProThe agent splits it into small PRs that are easy to review.
  4. For each PRM5 ProAn agent builds a PR and tests it on iOS and Android.
  5. M5 ProA second agent reviews the code.
  6. MeI review and merge.
  7. MeI merge the feature into main.
  8. M5 ProOff to TestFlight and Play internal testing.

My rules for AI

A contract with my agents. They bring the speed, I own the quality.

  1. 01I own the output.

    Agents write much of the code. I answer for every line.

  2. 02Nothing merges without me.

    Every pull request gets reviewed by me before it lands.

  3. 03Small, focused PRs.

    Easy to review, easy to trust, easy to undo.

  4. 04Tested on real devices.

    Not done until it has run on both iOS and Android.

  5. 05From 0 to 1, and after.

    Shipping is the start. I support and improve what I ship.

  6. 06Quality lives in the details.

    Users notice what we skip.

Other projects

  • Coming soonNative by DefaultThe React Native foundation for apps that feel truly at home on iOS and Android.Website
  • Side projectAudio ProfilesCustom sound profiles for calls, notifications and alarms on Android. 300K+ downloads.Google Play

On stage

11 talks & workshops

Conferences and workshops across Europe and the US.