Jérémy Favier / Freelance Flutter Lead Developer
I help product teams make their Flutter apps easier to evolve and their releases more reliable. Architecture, testing and technical leadership: embedded in your team, or through a focused audit.
18 years in software development5.0/5 on Malt · 12 client reviews
01 / EXPERTISE
I connect technical decisions to the realities of your product, your team and your next release.
Is each new feature getting harder to ship? I help clarify responsibilities, manage state and prioritise technical debt so the app can evolve.
Are releases taking too much effort? I automate delivery, test critical journeys and improve production monitoring, from pull request to the stores.
Does the team need technical direction? I help weigh architecture choices, review code and share knowledge through day-to-day collaboration.
Need a Flutter lead on your team?
Discuss a project02 / IN THEIR WORDS
The people I've worked with describe it best.
LINKEDIN EXCERPTS · FRENCH ORIGINALS TRANSLATED INTO ENGLISH
03 / SELECTED WORK
Client work and independent products. Different contexts, the same pleasure in making things work.
CONNECTED MOBILITYThe car, connected to daily lifeContribution to the My Renault mobile app at Renault Digital, in a multi-brand environment spanning Renault, Dacia and Alpine.
A mobile application in a multi-brand Renault, Dacia and Alpine environment.
Freelance Senior Software Engineer, with a technical lead role within the team.
Architecture, remotely managed internationalisation, CI/CD and code quality. Reviewing technical decisions with the team.
View the app on the Renault website (Netherlands) (opens in a new tab)
MOBILE / TRAVELOne journey, from search to platformMobile development with SNCF Connect & Tech teams: ticket inspection, payment, native integrations and testing.
Mobility applications, including a white-label ticket inspection and payment app.
Senior Dart / Flutter developer within SNCF Connect & Tech teams.
Architecture, contributions to JustGo and Airweb, native integrations and scanning. Unit, widget and golden tests, through to production launch.
Explore the SNCF Connect consumer app (opens in a new tab)
Patient records, clinical observations, team discussions and appointments. A mobile app built around healthcare professionals' workflows.
A medical solution for early detection of rare diseases.
Senior Flutter developer working on the app, including an audit and development support.
Real-time chat, biometric identification, notifications and error handling. Code review and pair programming to support the team.
Beta testingCreate and order photo products from your phone. An end-to-end mobile experience, from choosing pictures to placing an order.
SpoolkeepManage filament spools, track remaining material and calculate the material cost of 3D prints. Data stays on the device.
Completed projectWATCH DEMOCo-founded within Easivio. A photo-sharing network with a print service: photo books and prints from the phone or from Google Photos, Instagram and Facebook. Flutter, Firebase, CI/CD for Android and iOS, plus UI/UX mockups and marketing assets. Available on the Play Store and App Store.
Completed projectWATCH DEMOCo-founded (2019–2022). Create and customise widgets on mobile (weather, clocks, notes, radio, YouTube, calendar, news, photo carousel, air quality), then display them on Android TV through the Easivio TV companion app. Flutter, Firebase, Cloud Functions. Available on the Play Store and App Store.
In progressTailored trips built around what you want. Itineraries, places, routes and a travel guide brought together in one product.
In progressA digital loyalty platform for merchants: wallet cards, customer relationships and an app for scanning at checkout.
Volutea3D-printed home objects and an online store. Connecting design, manufacturing and the e-commerce experience.
BetaCONCEPT VISUALA clear view of every investmentBring investments together in one place: stocks, crypto and property. Track your portfolio and financial goals with a consolidated view.
04 / A FRESH TECHNICAL PERSPECTIVE
devlopn. AUDIT
Before a release, a rewrite or a funding round: understand the risks and decide what to fix first.
You receive a prioritised report that I review, contextualise and sign. Specialist AI agents support the analysis of Flutter, native iOS and Android code.
Explore DEVLOPN Audit View a sample reportDEFINED SCOPE · PUBLIC PRICING · EXPERT REVIEW
05 / EXPERIENCE
From large organisations to products built from scratch. The same focus: understand the problem, make sound decisions and take them through to production.
Technical lead on the multi-brand Renault, Dacia and Alpine mobile app: architecture, remote internationalisation, CI/CD and quality. Connecting the product, code and team.
Technical perspective, pragmatic decisions and an architecture the team can evolve.
Architecture for a white-label ticket inspection and payment app. Contributions to JustGo and Airweb: native integrations, scanning, unit, widget and golden tests, through to production launch.
Anticipating future needs, proposing technical solutions and moving the project forward with the team.
A medical solution for the early detection of rare diseases. Application audit, real-time chat, biometric identification, notifications and error handling.
Making care workflows reliable and supporting development through code review and pair programming.
A background in software engineering and team management, in environments where quality, coordination and reliability are everyday requirements.
Engineering discipline, knowledge sharing and the ability to connect technical decisions with operational constraints.
06 / BEFORE WE START
Short answers to the practical questions. For anything else, just write to me.
I join your team as a technical lead or senior Flutter developer: architecture, CI/CD, quality, code review and mentoring. That is what I did at Renault Digital, SNCF Connect & Tech and Zanalys.
My availability changes with ongoing missions. Get in touch with your context and timeline, and I will tell you where I stand.
Length, rhythm, on-site presence and daily rate depend on each mission. I am based in Lyon, France, and work remotely; the rest is worked out together, from your context, team and timeline.
An audit gives you a clear picture at a key moment (before a release, a rewrite or a funding round), with a defined scope and a reviewed, signed report. A mission is for longer-term technical support. If you are unsure, write to me and we will work out which one fits.
Eight review areas, including architecture, security, performance and store compliance, for Flutter, native iOS and native Android apps. Three tiers with public pricing, from €990 excl. VAT, delivered in 5 to 10 working days depending on scope.
Flutter and Dart are my core mobile stack. The audit also covers native iOS and Android apps. On the web side, my own products are built with Next.js, React and NestJS.
07 / LET'S WORK TOGETHER
LYON & REMOTEWhether you need support for your team, help moving an app forward or a fresh view on a technical decision, let’s talk.
A few lines about your context are enough to get started: product, team, timeline.
Or directly: contact@devlopn.comBook a call (15 or 30 min) (opens in a new tab)Hire me through Malt (opens in a new tab)Start with an audit