Rocket accelerator · Tosa certification
Build websites and apps.
Make a living as a freelancer.
The course for independents who want to sell what they build: showcase sites, online shops, web and mobile apps. You start from scratch, learn to code and to work with AI, then learn to find clients, with a trainer who follows up with you every week.
1,120 h
of training, fully online
4
capstone projects reviewed
32 wks
full-time, or at your own pace
Tosa
Web Developer certification
In short
You build, your clients pay
Believemy's Rocket accelerator is a 1,120-hour online course to become a freelance web developer: you learn to build websites and apps, with AI, then to find your clients.
Who it's for
Independents, employees changing careers and complete beginners. No prerequisites: a placement test adapts the course to your level.
How
27 modules and 4 capstone projects, with no fixed schedule. Your trainer checks in with you every week.
At the end
A live portfolio, your first clients in sight and the Tosa Web Developer certification. The exam is included in the price.
Believemy is a Qualiopi-certified training organization based in Paris.
What you'll be able to build
What your clients ask for, you'll know how to build
A shop owner wants a website, a nonprofit wants a platform, you want your own product. Here is what you'll be able to build and deliver by the end of the course.
Who it's for
The craftsman, the coach or the local restaurant that only has a Facebook page.
What you deliver
A fast site that looks right on mobile, shows up on Google and has a contact form.
<header class="home"> <h1>Martin's Bakery</h1> <p>Sourdough bread, baked every morning</p> <a href="#contact">Order</a></header>You learn it in module 5
Developers in the age of AI
What about AI?
I'll be honest: with Claude Code, you can now build in one evening what used to take a week. I use it every day, and so will you from module 20.
But the day a client's shop throws an error at checkout, on a Friday night, they don't call an AI. They call you. That day, you need to read the code, understand what broke and fix it fast. That's what Rocket teaches you: write with AI, and know what to do when it gets things wrong.
If all you want is to launch your own product, without making it your job, an accelerator built for that opens in December 2026.
Louis-Nicolas, your trainerFriday, 9:47 p.m.
Sophie, Ceramics Studio
Hi! Customers can't pay on the site anymore, it just keeps loading. Could you take a look?
✕ Error: order total is missing
- const total = cart.total;
+ const total = calculateTotal(cart);
Fixed and back online at 10:05 p.m.
The curriculum
27 modules, from your first page to your first client
In the order you take them. New sessions open every Monday, and each major stage ends with a capstone project reviewed by your trainer.
01Getting started
The shortest module: you find your way around the platform, the video calls and the community, so you're comfortable from week one.
What you do
You create your Discord account and get to grips with your learning space
02Web foundations
Rocket accelerator
Freelance web developer
- 1,120 hours, full-time or part-time
- 4 capstone projects, reviewed one by one
- Quizzes and over 100 hands-on exercises
- A weekly check-in, a video call whenever you need one
- The Tosa certification and a mock exam included
- Lifetime access to the content and the live workshops
Capstone projects
Four projects, just like with a real client
No demo: a brief, some constraints, and it's up to you to come up with a solution. That's what a client will expect. Your trainer reviews each project and sends you written feedback.
#1An interactive hangman game
HTML, CSS and JavaScript together in a complete game, versioned with Git and published on GitHub.
2 weeksAfter module 8
#2A blog with its admin area
Articles, an area to manage them and a portfolio, with PHP, MySQL and Bootstrap.
2 weeksAfter module 13
#3An X (Twitter) clone
A feed, profiles and interactions, built with React.
2 weeksAfter module 16
#4The project of your choice
Your own idea, taken all the way to launch with Next.js. Often the first product people sell.
2 weeksAfter module 26
And over 100 activities to practice
Challenges in every session, exercises and step-by-step projects: a Tinder clone, a Pokédex, a link shortener, a Threads clone.
Your pace
Full-time or alongside your job
The 1,120 hours are the same. What changes is how much time you put in each week.
Full-time
32 weeks
About 35 hours a week, to move fast. You take your sessions whenever suits you during the week.
Part-time
About 17 h a week
Evenings, weekends, alongside a job or a family. Modules open half as fast: the course lasts 64 weeks, and your trainer supports you for up to 18 months after you start.
Your journey
From the call to the certification, step by step
You know in advance what happens, and when. Nothing starts without a conversation with your trainer.
Enrollment
14 days
from signing to your start date
Training
1,120 h
32 weeks or at your pace
Certification
Included
mock exam and exam
Support
18 months
and lifetime access
Enrollment
Day one
You book a call
A short form, then you pick a time slot. We reply within 2 business days.
In the following days
A conversation with your trainer
30 minutes on video to talk about your project, your level and the pace that suits you. You decide afterwards, with no pressure.
Signing
Your training contract
You sign your contract, then you have 14 days to change your mind, no reason needed.
Before you start
Your placement test
An online questionnaire, sent as soon as you sign, that measures your starting level. Your trainer uses it to adapt your course and prepare your first meeting.
Training · 32 weeks or at your pace
A Monday, 14 days after signing
Your start date
You get your access and your first sessions are waiting for you. You work through the week at your own pace.
During the course
You learn by building
- 27 modules, 1,120 hours, no fixed schedule
- 4 capstone projects reviewed, with written feedback
- Quizzes passed from 70%
- A weekly check-in, a video call whenever you need one
Certification
At the end of the course
The mock exam
In the exam format, to measure your level and spot what still needs work.
Before the exam
The technical check
On video with your trainer: webcam, microphone, connection. On exam day, nothing takes you by surprise.
Exam day
The Tosa Web Developer certification
35 questions in 90 minutes, online and proctored. From 551 points out of 1,000, your certificate arrives by email within 10 business days.
If the mock exam shows you need more practice, you keep revising with your trainer before taking the exam.
After the course
Up to 18 months after you start
Your trainer is still there
He helps you land your first contract or your first job, and you keep lifetime access to the content and the live workshops.
Your follow-up
Your trainer follows your progress, week after week
Learning alone, people give up fast. Here, someone follows your progress and gets you unstuck when it gets hard.
- A check-in every week. Your trainer looks at where you are and what's blocking you.
- A video call when you need one. You book it from your dashboard, and your trainer suggests one if your progress slows down.
- Your questions between meetings. Under every session of the course, by email or on the learners' Discord.
- An individual review of every capstone project. With written feedback on what works and what still needs work.
- Support for up to 18 months. Until your first contract or your first job: that's the First Win guarantee.
Live workshops
Live workshops, even after the course
From time to time, your trainer runs a live workshop, sometimes with a guest professional. You ask your questions live, or watch the replay later. Your access never ends.
Live
with your trainer, sometimes a guest
Replays
available right after
For life
even years later
A community that helps each other
On Discord, current and former learners talk every day. Many keep working on projects together long after the course.
Some speakers from our 2023 talks
Lior ChamlaSymfony and React developer
Emmanuel DemeyDevFest Lille organizer
Mansour MahamatFront-end developer, indie hacker
Alexandre SoyerFull-stack developer
Axel ParisEntrepreneur
GitHub Global Campus
Your developer tools, free
Believemy is part of the GitHub Global Campus program. During your course, you get access to offers reserved for students.
JetBrains software
GitHub Copilot
A domain name
Microsoft Azure credits
A .tech domain name
Heroku credits for 24 months
No fees on your first €1,000
MongoDB Atlas credits
A year of 1Password
Your trainer
Louis-Nicolas Leuillet
Trainer and founder of Believemy
Louis-Nicolas designed the Rocket accelerator and runs it himself: he writes the content, follows every learner, reviews the capstone projects and prepares you for the certification.
He holds a bachelor's degree from SUPINFO, has been a freelance developer since 2017, and worked in instructional design at OpenClassrooms before founding Believemy.
170,000
subscribers on his YouTube channel
Since 2017
as a freelance developer
The certification
A score that shows your real level
The course prepares for the Tosa Web Developer certification, awarded by Isograd. The test is adaptive: question difficulty follows your answers, and you leave with a score from 1 to 1,000 you can show a client or a recruiter.
35
questions
90 min
online, proctored
551
points out of 1,000 to pass
A mock exam in the exam format and the certification exam are included in the price. The certificate arrives by email within 10 business days.
Results
Our results, published as they are
Like every Qualiopi-certified organization, Believemy publishes the results of its courses. They are updated every 6 months.
Results indicator
94%
satisfaction at the end of the course
Based on end-of-course questionnaires from Rocket accelerator learners, received from 12/05/2024 to 03/30/2026. Last updated in September 2026.
170,000
subscribers on your trainer's YouTube channel
4.9/5
on Trustpilot, from over 100 reviews
12,000
members registered on the Believemy platform
What former learners say
« One of the best courses on the market, very thorough. Louis-Nicolas has a unique way of teaching: he's always there and always listens. I highly recommend Rocket. »
« This course fit perfectly around my working life. It suits beginners as well as people who already know a bit about web development. »
« The course is very thorough, with only relevant languages. You learn a huge amount, it's really great. »
« I found work in web development that lets me make a living from Africa. It's possible to do this job and live off it! »
After the course
Your first clients, and a living from them
Rocket trains you first to sell your services as a freelancer: find clients, set your price, deliver work that brings them back.
What you'll be able to sell
- Showcase websites for craftspeople, shop owners and independents
- Online shops, from product page to checkout
- Custom web apps that replace spreadsheets
- Maintenance and updates for existing websites
- SEO, so your clients get found on Google
How much to charge
€236per day excl. VAT, at the very least
That's what you need to charge to keep €3,000 a month as a French micro-entrepreneur, once contributions, tax, holidays and public holidays are taken out (liberal profession, single person, 2026 rates). Module 22 teaches you how to set your prices.
Work out your own rateWould you rather have a salaried job?
The same skills open doors in companies too.
- Web developer
- Front-end developer
- Back-end developer
- React developer
- Web integrator
€34,000
gross per year at the start
€53,000
gross per year with experience
Source: APEC job profile (France). The range varies with company size and region.
The course at a glance
Everything you need to know before you enroll, in one place.
- Who it's for
Open to everyone, no technical prerequisites. You need a computer, an internet connection and the ability to install software. A conversation with your instructor comes before enrollment, and a placement test opens the course.
- Objectives
- HTML: use the right elements and attributes to structure a page.
- CSS: apply style rules, position elements and work with an existing stylesheet.
- JavaScript: create and manipulate objects and interact with the DOM.
- Web integration: combine HTML, CSS and JavaScript, make pages dynamic and fix bugs.
- Autonomy: read and apply the technical documentation of an external library.
- Business: choose a legal status, find your first clients and set your rates as a freelance developer.
- Duration
32 weeks, i.e. 1,120 hours (about 35 hours a week). Part time: 64 weeks, about 17 hours a week. Your instructor supports you for up to 18 months after your start date.
- Enrollment
Open enrollment. After the conversation with your instructor and the signature of your contract, your training starts on a Monday, 14 days after signing. The course is fully online.
- Price
€4,500, paid at once or in 3 to 24 monthly installments, interest-free up to 12.
- Funding
Pay yourself, in one go or in 3 to 24 monthly installments, interest-free up to 12. Your employer can also cover the course through its skills development plan: we provide the quote and the training agreement. The course cannot be funded through the French CPF at this time.
- Methods
Video and text sessions, exercises, live workshops, four capstone projects, one-on-one follow-up by your instructor, questions under each session and peer support on Discord.
- Assessment
Quizzes and exercises throughout the course, four capstone projects reviewed individually, then the Tosa Web Developer certification (35 questions in 90 minutes, taken online).
- Certification
Tosa Web Developer, awarded by Isograd, with a score from 1 to 1,000 that measures your level.
- Next steps and career outcomes
Career paths: web developer, front-end or back-end developer, React developer or web integrator, freelance or in a company. The Tosa Web Developer certification is not registered with France compétences: it gives no equivalence or bridge to other certifications, and cannot be obtained block by block. After the course, you can specialize (React, Next.js, artificial intelligence), take our Python course, or prepare a digital degree such as the French Web and Mobile Web Developer professional title (level 5).
- Results
94% satisfaction at the end of the course. Tosa Web Developer certification pass rate: 0 out of 2 candidates so far, in two exam sessions disrupted by technical incidents; every candidate now does a technical check before the exam. Believemy has been an approved Tosa center since August 2025, and learners have enrolled on this track since January 2026. Updated every 6 months, last updated in September 2026.
- Disability
The course is open to people with disabilities. Your disability contact, Louis-Nicolas Leuillet, will work out possible accommodations with you: write to hello@believemy.com.
- Contact
Louis-Nicolas Leuillet, your instructor and learning contact: hello@believemy.com.
Believemy is a Qualiopi-certified training organization. The quality certification was granted for the following category of action: training actions.
Your guarantees
Two commitments, in writing
Legal14 days to change your mind
After signing your contract, you have 14 days to withdraw, with no condition and no reason needed. One email is enough, and you get a full refund within 7 business days.
BelievemyThe First Win guarantee
Your trainer stays by your side until your first contract or your first job: advice, feedback on your quotes, interview prep. For 18 months after you start.
FAQ
Your questions, answered
Another question? Write to us at hello@believemy.com.
Your first launch starts on a Monday
Enrollment is open all year: your course starts on a Monday, 14 days after you sign your contract.
Free call, no commitment · 14 days to change your mind after signing