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A web application written before it is coded
An internal tool to replace an Excel file, a customer portal, a dashboard, a prototype to test with users. The project starts with a specification, a Figma mockup and a working prototype, then ends in production, with one point of contact from start to finish.
free and with no obligation
deliverables in your name
through to production
4 steps, with the price and timing of each.
For example: an SME with a process kept in a shared Excel file, which has already received agency quotes. You can stop after any step, with deliverables that belong to you.
Discovery call
15 minutes, free. We set out the problem, the users, the deadline and the budget, and look at the quotes you have received.
Costed proposal
Within 48 hours, in writing: the firm price of the mockup and specs, and a first estimate for the build.
Mockup, artefacts and specs
From €8,000 excl. VAT. The specification, the data model, the Figma mockup and a working prototype. You can hand them to the team of your choice.
Build
From €20,000 excl. VAT in total, with a firm price set once the specs are approved. A demo every one to two weeks, then the move to production and the handover.
To get started: book a 15-minute call. The timeline for each step is written into the proposal, before you commit.
Write the application before coding it.
Many application projects go off track because development starts on a need that was never fully written down. Here, the first phase produces the specification, the mockup and a working prototype. Development starts once these deliverables are approved.
- ScopeThe problem, the users and the business rules are written down. Artefacts, meaning interactive prototypes, are used to test the journey before committing to development.
- Design and break downThe screens are designed in Figma, linked together, with every state planned: empty, loaded, error. The scope is then broken down into tickets in Linear, each with its acceptance criteria.
- Build and deliverCycles of one to two weeks, with a version you can open online at the end of each one. Then the move to production, the handover of access, written documentation and a recorded walkthrough.
Crypto Excel, my own product, from mockup to live application.
I founded Crypto Excel, a cryptocurrency portfolio manager: first a spreadsheet to test the idea, then a full SaaS, upgraded for more than three years. Here are its deliverables, in the order they are produced on a project. The important decisions are made at the mockup stage, when a change still costs little.
The journey first
The Figma prototype links the screens together: the journey is approved by clicking through it, before every detail is designed.
A component library
Buttons, fields, tables: each component is designed once with all its states, then reused on every screen.
The data model
Each object, its fields and its links to external services: payments, emails, cryptocurrency prices.
The live application
The components and states approved in Figma appear exactly as designed in the application.
A design system from the mockup stage: colours, typefaces, spacing and components are defined once, then reused on every screen and in the code. More screenshots of the project are on the portfolio page.
What an application costs, depending on who builds it.
For an equivalent scope: the typical ranges on the French market, and the rate charged here. A useful benchmark when reading the agency quotes you have received.
- Three to five people involved, including at least a salesperson and a project manager.
- The coordination time between them is billed on top of the development.
- The code often relies on a technical base specific to the agency.
- A recurring maintenance contract is usually offered afterwards.
- The risk of going over budget and over time stays with you.
- They build what they are asked to, without questioning the scope.
- They are paid for the time spent, whatever the result.
- One person, from the first meeting to production, with no intermediary.
- Fixed price and timeline written into the quote: if the work takes me longer than planned, the price does not change.
- Documented code, mainstream technologies, in your GitHub repository. You own it.
- No mandatory maintenance contract.
The first two columns are typical ranges on the French market, given as a benchmark: your situation may differ. The third is the rate charged here.
2 offers, in this order.
You decide to build once the mockup and specs are approved. A costed proposal within 48 hours of the discovery call; the firm price of the build is set at the end of the first offer.
Mockup, artefacts and specs
- Functional specification in Linear: epics, user stories, acceptance criteria
- Data model and user journeys with their edge cases
- Figma mockup with clickable prototype
- Artefacts: a working prototype, produced with Claude Code
All the deliverables needed to start development, with me or with the team of your choice. We start with a free 15-minute call.
Book a 15-minute callFull implementation
- Everything in the mockup, artefacts and specs offer
- Development in cycles of one to two weeks, with a demo at the end of each cycle
- Code delivered to your GitHub repository
- Supported move to production and handover
Firm price set once the specs are approved, before the first line of code. One point of contact from the first meeting to delivery.
Book a 15-minute callNo VAT charged: VAT exemption scheme for small businesses, art. 293 B of the French General Tax Code.
Not sure yet whether to build? Product scoping (from €2,500 excl. VAT, delivered in one week) answers that question first.
A first version with a limited scope? An application built with Lovable starts from €2,900 excl. VAT. The difference between the two offers is explained on the Lovable page.
Not sure yet which format you need?
Five questions, 20 seconds. You get the service that fits, a budget range and a timeline. No email address required.
Take the questionnaireBefore we start.
We already have agency quotes. Where do we start?
Bring them to the discovery call. We look at what they cover and what they leave out. The mockup and specs then give you a written scope that any provider can price, me included.
What is an artefact?
An interactive prototype produced with Claude, an AI assistant, during the first phase: an early version of the application that we use, question and improve over a few iterations. You approve the journey by using it, before the production code is written.
What does the mockup, artefacts and specs offer include?
The written functional specification, the screen map, the data model, the user journeys with their edge cases, the matching Figma mockup and the task list (the backlog) written in Linear. It is what a development team needs to get started, with me or with another provider.
What role does AI play in your work?
I use Claude, an AI assistant, for the write-up: rephrasing, breaking down, checking that the screens and the data model are consistent, writing the edge cases one by one. This work takes hours rather than several days. The decisions remain mine, and I review every document before sending it to you.
Can I take the mockup and specs and have it built elsewhere?
Yes. The Figma files, the specs and the Linear backlog belong to you. You can hand them to your in-house team, an agency or another freelancer: they are written to be picked up by someone other than me.
What makes the implementation price vary?
The number of screens, the complexity of the data model, the connections to your existing tools and the level of requirements on permissions and roles. The 15-minute discovery call is enough to gauge the size of the project; the firm price is set once the mockup and specs are approved, before the first line of code is written.
What if the project stops after the mockup and specs?
Then it stops there. You have paid for a closed offer and you leave with usable deliverables. That is the point of splitting the work: €8,000 excl. VAT committed to know exactly what you are building, before funding the development.
Which technologies is the application built with?
Mainstream technologies, chosen so that any developer can take over the project: TypeScript, a widely used interface framework, a relational database, standard hosting. The code is in your GitHub repository from day one. No in-house tool that only I would know how to use.
Let's talk about your application.
Fifteen minutes to set out the problem, the deadline and the budget. The call is free; if the scope is clear enough to be priced, you receive a proposal within 48 hours.