flutter studio — two devs, no fluff

FluttyMobile, web and desktop app studio

We design, build and ship custom mobile and web apps.

Let’s talk about your app Work

01 / studio

Two experts, two paths, zero fluff.

President — Flutter & Kotlin tech lead
Florian KAISER
Over 15 years of code, from Java at Airbus to SNCF Connect, where he was the go-to Flutter person, a Kotlin backend developer and then lead dev of a 15-person team. A monorepo shared by over a hundred developers, CI, design system, architecture: big projects are his playground. Today he also writes Flutter and Kotlin at Younited.
LinkedIn ↗
Managing director — Flutter developer
Quentin PAYRE
Flutter developer since 2021, across worlds that have nothing in common: health tech as Head of Mobile at MonOrdo, fintech with helios, champagne with Bollinger and the NavXL truck GPS, voted best truck GPS app in Europe in 2025. Before Flutter, Python, all the way to powertrain simulations at Continental. Today he also builds for Renault Digital.
LinkedIn ↗

02 / references

They trusted us.

2R Industrie
Boulangerie Honoré
Mission Locale Haute-Garonne
MonOrdo
SNCF Connect
Softee

03 / reviews

What they say.

We are very happy with the result, and above all with how it all went! A very pleasant, positive collaboration that led to a great product! Thanks a lot, and see you very soon to finish Appels Pro and build plenty more!

Bernard de LaforcadeClient — Appels Pro — Business Lead

Fast, efficient, reliable and patient are the words that best describe Quentin. You can trust him blindly and hand him your projects without worry.

Caïn SeminoDirector

Thanks Quentin!!! It was a pleasure working together :)

Camille Le MeurHead of Product — helios

Reliable, rigorous and committed! You can pick Quentin for your projects without hesitation.

Florent M.Software developer

Thank you Quentin for your good mood and everything you built, really happy to have worked with you!

Maeva CourtoisFounder & CEO — helios

Top notch, I recommend Quentin, very reliable. You can work with him with your eyes closed.

Ruben Ferreira De SousaCEO — RDS

I was lucky enough to work alongside Quentin for nearly 12 months. […] His speed, constant good mood and technical skill make him an exceptional colleague! […] Thanks to him, we pulled off a migration in barely 6 months, when other companies take up to 2 years!

Solène Michel-GrosjeanFlutter developer

I warmly recommend Quentin for his remarkable talent as a Flutter dev. His technical expertise and his ability to write clean, efficient code were an essential asset for our project.

Thibault P.Product owner

We are very happy with the result, and above all with how it all went! A very pleasant, positive collaboration that led to a great product! Thanks a lot, and see you very soon to finish Appels Pro and build plenty more!

Bernard de LaforcadeClient — Appels Pro — Business Lead

Fast, efficient, reliable and patient are the words that best describe Quentin. You can trust him blindly and hand him your projects without worry.

Caïn SeminoDirector

Thanks Quentin!!! It was a pleasure working together :)

Camille Le MeurHead of Product — helios

Reliable, rigorous and committed! You can pick Quentin for your projects without hesitation.

Florent M.Software developer

Thank you Quentin for your good mood and everything you built, really happy to have worked with you!

Maeva CourtoisFounder & CEO — helios

Top notch, I recommend Quentin, very reliable. You can work with him with your eyes closed.

Ruben Ferreira De SousaCEO — RDS

I was lucky enough to work alongside Quentin for nearly 12 months. […] His speed, constant good mood and technical skill make him an exceptional colleague! […] Thanks to him, we pulled off a migration in barely 6 months, when other companies take up to 2 years!

Solène Michel-GrosjeanFlutter developer

I warmly recommend Quentin for his remarkable talent as a Flutter dev. His technical expertise and his ability to write clean, efficient code were an essential asset for our project.

Thibault P.Product owner

04 / in-house apps

Our own apps. Our playground.

In development

Pocket Money

Pocket money, played as a game.

Kids tick off their chores, earn points and watch their piggy bank grow. Parents approve with one tap.

Flutter
Firebase
flutty_state

In development

People Scan

The icebreaker for your events.

A QR-code game for weddings, birthdays and treasure hunts: guests scan each other's badges and hidden codes to score points, while a big screen shows the live leaderboard. One Flutter codebase for the web game, the Android back office and the TV display.

Flutter Web
Android
Firebase

05 / client work

The portfolio, minus the glass display case.

2026Business LeadAppels Pro

The problem

Tradespeople lose customers whenever they miss a call. Business Lead wanted an app to take over: call forwarding, request qualification, a lead card and one-tap call-back.

What we did

Design and development of the iOS and Android app, from the guided onboarding (call forwarding for every carrier) to the integration of the existing API. Dedicated design system, Widgetbook catalogue and golden tests.

Results

Onboarding that sets up call forwarding in 3 minutes, carrier by carrier
AI-generated request summaries and lead cards on a map

iOS
Android
Push
API
IA

We are very happy with the result, and above all with how it all went! A very pleasant, positive collaboration that led to a great product! Thanks a lot, and see you very soon to finish Appels Pro and build plenty more!
Bernard de Laforcade — Business Lead

2023SNCF ConnectSNCF Connect

The problem

France's go-to train travel app: over a hundred developers on a single monorepo, critical traveller features and a sustained release pace.

What we did

Flutter lead and Kotlin backend services, then lead dev of the FIND team (15 developers): technical choices, architecture and organisation, still hands-on.

Results

2024 recap, traveller alerts (full train), beta mode, train search
Monorepo split, faster GitLab CI, code generator from the database to the front end
In-app dev tools for testers, POs and designers

Duration — 3 years

Flutter
Kotlin
BFF
CI GitLab
Design system

Web ↗App Store ↗

2025Renault Groupmy rnlt

The problem

One app to run your Renault: check the range, start charging or the air conditioning remotely, plan a trip with charging stops, manage maintenance.

What we did

Flutter development within Renault Digital's teams, on the connected app for Renault vehicles.

Results

Scheduled and bidirectional (V2G) charging from the phone

Flutter
iOS
Android
Véhicule connecté

Web ↗

2023helioshelios

The problem

An eco-friendly neobank: account, card and day-to-day budget, in an app that has to inspire trust as much as it appeals.

What we did

Flutter mobile lead, then feature development: new onboarding, product quality (golden tests, GitLab CI), Flutter upgrade.

Results

Move to Material 3 and a new dark theme

Duration — 18 months

Flutter
Fintech
Tests golden
Material 3

Thank you Quentin for your good mood and everything you built, really happy to have worked with you!
Maeva Courtois — helios

Web ↗App Store ↗

2025Boulangerie HonoréHonoré Inventory

The problem

Track stock across several shops and label products without re-typing, on Android tablets and Windows PCs.

What we did

Design, cross-platform Flutter development, TSC label printer driver (open-source flutty_tsc_printer package), CI and distribution.

Results

Stock in and out by scanning, label printed on the spot

Android
Windows
Imprimantes TSC
Scan

2021NavXLNavXL

The problem

A GPS built for trucks: routes based on the vehicle's dimensions, tolls and traffic restrictions.

What we did

Flutter development of the mobile app.

Results

Voted Best Truck GPS App in Europe 2025 by Transportation Review

Duration — 9 months

Flutter
GPS
Cartographie

Web ↗App Store ↗

2021Champagne BollingerBollinger 1829

The problem

Bring enthusiasts inside the house: exclusive content, rare vintages and life at the estate, with the brand's elegance.

What we did

Flutter development of the exclusive-content app.

Duration — 8 months

Flutter
Luxe
Contenus

Web ↗App Store ↗

2021Mission Locale Haute-GaronneShaker trente et un

The problem

Help young people in Haute-Garonne find job offers and their local Mission Locale office, with a simple, reassuring app.

What we did

Complete rebuild of the app in Flutter.

Duration — 6 months

Flutter
Service public
Emploi

App Store ↗

2025VetodiagPDF Barcode Watcher

The problem

Hundreds of PDF reports filed by hand, each one identified by a barcode.

What we did

A Windows service that watches a folder, reads the barcodes in the PDFs and renames the files automatically. Shipped with its installer.

Python
Windows
Automatisation

06 / open source

We publish what we use.

1,422downloads / 30 d · as of last build

pub.dev stats
package	version	likes	downloads / 30 d	points
flutty_stateLightweight reactive state management: fetch, submit, loading and errors without boilerplate.	0.4.0	3	281	160/160
flutty_dsDesign system: tokens, components and UI primitives.	0.2.0	2	272	160/160
flutty_tablesAdvanced tables: sorting, filtering, pagination.	0.3.0	2	399	160/160
flutty_testTest helpers and matchers for Flutty packages.	0.3.0	2	275	160/160
flutty_tsc_printerDrives TSC label printers over TCP/IP (TSPL).	0.1.1	2	195	160/160

Flutty-Lab/flutty_coreThe Melos monorepo for all our packages and demo apps.private for now
Flutty-Lab/docker-imagesFlutter Docker images for CI and reproducible golden tests.private for now

github.com/Flutty-Lab ↗

07 / freelance devs

Developer looking for a gig?

We often come across more projects than we can take on. If you're a freelance developer, Flutter or not, send us your profile: when a gig fits you, we'll put you in touch with the client.

Send my profile ↗

01You write to us: stack, availability, day rate, city or remote.
02We keep your profile at hand.
03A gig fits? We make the introduction.

08 / contact

Got a project? We take off whenever you want.

Where — Paris and Toulouse, France

FluttyMobile, web and desktop app studio

Florian KAISER

Quentin PAYRE

Pocket Money

People Scan

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Got a project? We take off whenever you want.