I build
From the first mockup to the store listing, I take the project from end to end.
Technologies : Flutter, Dart, Riverpod, Next.js, TypeScript, React, Supabase, Firebase, Tailwind CSS, Node.js, Figma, Git.
What I do
An idea for a project.A rebuild.A product to launch.I'll take you from thefirst conversationall the way to launch.
In practice
The web
Not just mobile. The web too.
Showcase sites, online shops, learning platforms. Next.js and TypeScript, from mockup to production.
What I build
Four ways to put an idea online.
It depends what you want to build and how far along you are. If you're unsure, the first call is there to settle exactly that.
iOS and Android, one codebase.
Flutter and Dart. I design, build and ship the app end to end, including the developer accounts, the store listings and the updates.
- Clean, testable architecture
- Offline, notifications, biometrics
- App Store and Play Store releases
- Flutter
- Dart
- Riverpod
- Firebase
An interface built around a real need.
Accounts, roles, data, dashboards. I design the journey before writing the code, so the tool fits the business rather than the other way round.
- Authentication and role management
- Dashboards and exports
- Database and API
- Next.js
- Supabase
- TypeScript
- REST API
Fast, findable, pleasant.
Showcase sites, shops, platforms. Next.js and TypeScript, built to load fast and rank well on search engines.
- Showcase sites and online shops
- SEO and performance
- Custom animations and interactions
- Next.js
- Tailwind
- SEO
- Vercel
From a blank screen to a testable version.
Finished enough to put in front of real users, clean enough to build the rest on. We validate the idea before investing in it.
- Mockups and user journeys
- A working MVP in a few weeks
- Iterations after the first feedback
- Maquettes
- MVP
- Tests
- Itération
How it works
A clear course. No blind spots.
- 0160 minutes
Understand
One call, and it all starts there.
What you want to build, who for, and why now. I'll tell you honestly whether the project holds up, including when the answer doesn't suit me.
- 02Within 1 week
Design
Screens before code.
Journeys, key screens, edge cases. You see what the product looks like before a line is written: that is when we fix things, while it still costs nothing.
- 033 to 8 weeks
Build
A clean foundation, not a demo.
Flutter for mobile, Next.js for web. Code someone can pick up and build on in six months, not a prototype you'll have to throw away.
- 04A set launch day
Ship
Live, for real.
Deployment, store releases, checks on real devices. The project is finished when it runs for your users, not for me.
About
Hi, I'm Vivien.
Freelance mobile and web developer. I turn ideas into apps people enjoy using: clear interfaces, easy to pick up, that hold up once they're in production.
My background, my tools and my certifications are this way.
More about meIn their words
What they say.
Vivien really took the time to understand what we wanted to convey with Assabil Academy. He proposed a site that is both modern and simple to use, while clearly showcasing our different Quran, Tajweed and Islamic sciences programmes. We are very satisfied with the result and with how seriously he approached the project.
Mamadou Bobo BahCEO, Assabil AcademyProject : Assabil Academy
The project was fairly comprehensive: a civic exam preparation app with quizzes, a progress system and rewards. Vivien turned our requirements into an app that is clear and pleasant to use. We appreciated his commitment and, above all, his ability to understand how the project worked as a whole.
France AccessOrganisation, France AccessProject : Mon Test Civique
Working with Vivien on the Agencetek site was a very good experience. He quickly grasped our positioning around digital and AI, and managed to translate it into a site that clearly presents our different areas of expertise. I particularly appreciated his ability to propose solutions rather than simply carrying out requests.
Aboubacar SoumahVice-CEO & co-founder, AgencetekProject : Agencetek
For Bhibling, I wanted something that would genuinely showcase my creations without feeling like a plain catalogue. Vivien understood that idea well and built a site that matches the image I wanted to give the brand much more closely. I really appreciated how he listened and the adjustments he made along the way.
Bienheureuse AmagbegnonFounder, BHIEBLINGProject : BHIEBLING
We wanted to modernise our farm's image while keeping its family-run, authentic character. Vivien found a good balance between the two, with a site that is simple, modern and pleasant to browse. We particularly appreciated the care taken in presenting our products and our activity.
Ferme AssikoFamily farm, Ferme AssikoProject : Ferme Agro
Book a call
Let's talk it through.
An hour on video, with me directly. Pick a slot: I'll confirm the meeting and send you the link within 24 hours.
A 60-minute call
A conversation to understand your project. You leave with a clear opinion, whether we work together or not.
Vivien AMAGBEGNON
Not ready to block out an hour yet? Write to me
September 2026
Monday, September 28
Paris time
FAQ
What to know before you start.
Pricing, timing, who owns the code: everything worth knowing before we begin. If something is missing, write to me.
It depends entirely on what you want to build. A simple app with a few screens does not cost the same as a full platform with a backend, authentication and payments. We talk it through, and I give you a detailed, transparent quote. No nasty surprises.
For a working MVP, expect 2 to 6 weeks. A complete app with every feature, testing and deployment is more like 1 to 3 months. It also depends on how quickly you come back on feedback and approvals.
I handle all of it: setting up developer accounts if needed, preparing production builds, screenshots, descriptions, and submitting to the App Store and Google Play. There is nothing for you to do.
Of course. An app is a living thing. I offer ongoing support after launch to fix any bugs, keep dependencies up to date, and add new features when you need them. We agree on an arrangement that suits you.
Not at all. Plenty of my clients arrive with nothing but an idea. I handle the UX and UI design before writing any code. You approve the mockups, then I build.
Yes, entirely. The repository is transferred to you on delivery, along with access to every service used. You are not tied to anyone: another developer can pick the project up without me.
Yes, and that is deliberate. You have one person from the first call to launch: the person who designs it is the person who builds it, so nothing gets lost between two parties.
Yes, with clients more or less everywhere. We talk over video and in writing, and you follow the project as it progresses.
Contact
Got an idea? Let's talk.
A problem to solve, an interface to imagine, a product to build. Describe it in a few lines: I reply within 24 hours.
Would you rather talk it through? Book a call
Available, working remotely