AUTOSUIVI
Car maintenance tracker
The all-in-one vehicle logbook: servicing, fuel-ups, expenses, paperwork and statistics. Automatic reminders, a due-date calendar and a companion website with cost calculators (TCO, tax penalties, trip cost).
Available remotely, year-round
Guillaume Leleu
Independent iOS, Android and web developer in Rouen
Mont-Saint-Aignan / Rouen, Normandy
I design iOS and Android apps, and websites — from the idea to launch.
Eight published apps, shippable on the App Store and Google Play. I also build websites: brochure sites, online tools, Google visibility. Solo, from the idea to launch.
8
apps shipped
6+
years of experience
Solo
iOS, Android and web
Live
Apps
Eight apps designed, built and shipped solo — iOS, Android, through to the stores.
Automotive apps
OpenRank
Driving tracker
Real-time GPS telemetry for car enthusiasts: speed, acceleration, fuel consumption. Turn-by-turn navigation, XP leaderboards, clubs and achievements to unlock.
ParkCipher
Find your parking spot
One tap to save your spot, map guidance to walk back to it. GPS mode outdoors and an underground assistant that records level, aisle, spot number and a reference photo. OpenStreetMap, ad-free.
OpenSpot
Car spotting
The car-spotting social network: photograph a rare car on the street, identify it from a built-in model library, pin it on the map and earn XP. Plate detection uses a hashed fingerprint, never stored in clear text.
AUTOGUESSER
Car quiz
Four ways to test your car knowledge: timed multiple choice, four-clue deduction, spec battles and a chassis mode for purists. Daily challenge, leaderboards and a vehicle collection.
Other apps
Lecto
Read it later
A private read-it-later queue: share a link from any app and Lecto grabs the title and preview. Local-first library with optional HTTPS sync to servers hosted in France. No ads, no trackers.
Le Sanctuaire
Gratitude & diary
A daily ritual: three guided gratitudes, five-level mood tracking and a free-form journal with hashtags. History, streaks, time capsules and an “on this day” flashback.
SubTrack Pro
Subscription manager
Streaming, SaaS, cloud, news: every subscription in one place, with monthly and yearly totals, multi-currency support and reminders before each charge. Pro adds cost-per-use and zombie-subscription alerts.
Work with me
What I can do for you
An app, a website, or both. For an individual, a charity, a small business or a large group: if the project is clear, we can work together.
iOS & Android apps
Design, development and release. I ship to the App Store and Google Play, with TestFlight, store listings and updates.
Websites
Website creation: brochure sites, landings, online tools. Responsive, polished, findable. From the first layout to production.
Behind the screen
Member area, data storage, notifications, payments. Hosted in France.
Be found and get paid
In-app subscriptions, online payments, visibility on Google and the stores.
Who I work with
Individuals, freelancers, associations, SMEs, large companies, public bodies. No size filter: I take work where I can ship a real result.
Ballpark figures
Ranges, not a frozen catalogue. A quote follows a conversation about the actual need. Indicative day rate: around €450.
Brochure website
from €1,500
A few pages, comfortable on a phone, go-live and the basics of search visibility.
Fuller site or online tool
€3,000 – €8,000
Member area, forms, manageable content, or a small business tool.
Mobile app
from €4,000
One platform (iOS or Android), through to store publication.
iOS and Android
from €6,000
Both stores, accounts, payments if needed, and the first updates.
Amounts in euros. VAT treatment is stated on the quote. A simpler or more ambitious project is open for discussion.
How I work
Few meetings, plenty of testable versions. Remote, year-round.
-
01
Scope
We define the problem, the audience and the first useful version. No extra layers, no ghost roadmap.
-
02
Build
Interface, website or app, API, accounts, payments. I ship testable increments, not a single drop at the end.
-
03
Ship
App Store, Google Play or website launch. Then iterations: feedback, fixes, small improvements.
Skills
What I do
In plain terms: apps, websites, and getting them live. No jargon.
Mobile apps
- iPhone and iPad
- Android
- Release on the App Store and Google Play
- Accounts, payments, notifications
Websites
- Brochure site
- Online tool
- Comfortable on phone and desktop
- Findable on Google
Launch and follow-up
- Hosting in France
- Updates
- Small improvements
- Straightforward talk, no jargon
About
About
I live and work in Mont-Saint-Aignan, near Rouen. I have a permanent role at NEOMA Business School, and I also teach at YNOV Campus; I taught at the University of Rouen Normandy. Alongside that I freelance year-round, remotely — websites and iOS and Android apps, for any kind of client. The goal is simple: useful tools, published and maintained.
January 2025 — present
Instructor
YNOV Campus, Mont-Saint-Aignan (76)
Adjunct lecturer and instructor: advanced OOP, best practices, robust architectures, introducing AI into programming, data analysis and manipulation in Python, web accessibility and quality.
November 2023 — July 2026
Lecturer
Université de Rouen Normandie, Mont-Saint-Aignan (76)
Hands-on teaching of web and programming across university programmes: HTML/CSS, XML/XSLT, Python.
January 2022 — present
Developer, instructor and assistant
NEOMA Business School, Mont-Saint-Aignan (76)
Academic lead for the Coding School: tutorials and exercises (HTML, CSS, PHP, SQL, C#, C, R, Python, Java, Go). Student support, faculty assistance and AI projects.
- Learner-facing web platforms, including Excel Mastery.
- Talks and workshops on HTML and Python.
- Community management (Meta Business Suite, Buffer).
May 2020 — present
Freelance web and mobile developer
Freelance, Mont-Saint-Aignan (76)
Building modern websites and iOS and Android apps — from the idea through to the App Store and Google Play. Work for any kind of client, remotely.
- Eight independent apps published (AUTOSUIVI, OpenRank, Lecto, Le Sanctuaire, SubTrack Pro, ParkCipher, OpenSpot, AUTOGUESSER).
- Sites and tools: auto-suivi.fr, openrank.fr, guillaumeleleu.fr.
- Repositories: github.com/GuillaumeMrNiato
Contact
Let’s talk about your project
An app, a website, a mission. I am reachable year-round, remotely. I usually reply within 24 hours.
FAQ
Frequently asked questions
Short answers, for people and for search engines.
Who is Guillaume Leleu?
Guillaume Leleu is an independent mobile and web developer based in Mont-Saint-Aignan, near Rouen (Normandy). He builds iOS and Android apps, creates websites, and teaches at YNOV Campus and NEOMA Business School. He also taught at the University of Rouen Normandy.
Does Guillaume Leleu build iOS and Android apps?
Yes. He ships to the App Store and Google Play. Eight apps are live, each with its own server (accounts, subscriptions, notifications).
Can he create a website?
Yes. Brochure sites, landing pages, online tools — comfortable on a phone, findable on Google. Examples: auto-suivi.fr, openrank.fr, guillaumeleleu.fr.
Where is Guillaume Leleu based?
In Mont-Saint-Aignan (76), in the Rouen area, Normandy. He is available year-round remotely, in France and abroad, alongside his permanent role at NEOMA.
Where does he teach?
YNOV Campus (since January 2025) and NEOMA Business School (since January 2022), both in Mont-Saint-Aignan. He taught at the University of Rouen Normandy from November 2023 to July 2026.
Who do you work with?
Any kind of client: individual, freelancer, association, SME, large company, public body. No size filter. If the need is clear, we can move forward.
What are the rates?
These are ballpark figures: brochure site from €1,500, fuller site €3,000 to €8,000, mobile app from €4,000, iOS and Android from €6,000. Indicative day rate around €450. A quote follows a conversation.
Are you available? Do you work remotely?
Yes. Available year-round, remotely, alongside a permanent role at NEOMA Business School. We organise around that schedule, including evenings and weekends when needed.
How can I contact him for freelance work?
Through the form on guillaumeleleu.fr, by email at contact@guillaumeleleu.fr, or on LinkedIn (guillaume--leleu). He replies remotely, year-round.