Your custom software delivered to production every week for a fixed budget.

They trusted us

DEVEDANOS is a custom software development agency founded by Sébastien Nobour, available in Maastricht (Netherlands) and Versailles (France), specializing in Continuous Delivery and agility. The agency builds custom web applications (SaaS, marketplaces, e-commerce, CRM, internal tools, AI integration) primarily in React.js, Node.js, and TypeScript for mid-market companies across Europe and the United Kingdom. DEVEDANOS operates on a monthly subscription model with weekly production deployments, a trial period, a fixed monthly budget with no amendments, and a contractual zero-regression guarantee.

Software development: the traditional approach vs. ours

Frequently asked questions

What is custom software development by subscription?

A model where you pay a fixed monthly budget (14,250 EUR/month) for continuous development, instead of a one-time quote based on estimates that always turn out wrong, where quality is the first casualty when deadlines slip and where any change in priorities triggers an amendment. You change priorities at any time, with no amendment.

How long does it take to develop custom software?

At DEVEDANOS, you use the software in real conditions from the very first weeks. Working software is the primary measure of progress. Our Continuous Delivery discipline allows us to ship features continuously. Waiting months for a full delivery, or following demos orchestrated by a project manager hiding what does not work, only delays the moment you get the answer to this very question.

How does the collaboration work?

Custom software development works like the relationship between an author and a printer. You know your business and your users. We master software engineering. Your involvement is essential: acceptance testing of features, regular feedback, priority decisions. Without that, no provider can deliver software that matches your needs.

What happens if I am not convinced after the trial period?

No invoice issued. The trial period lasts up to 15 working days. Not convinced, no payment due. The produced code remains the property of DEVEDANOS.

What happens if a bug appears?

Three cases must be distinguished. A regression (a feature you had tested and approved behaves differently after a change): our zero-regression guarantee applies, we fix it and add an automated test that prevents its reappearance. A defect found during acceptance testing (the delivered behavior does not match what you expected): either the specification we prepared together contained an error, or the feature does not respect the specification. In both cases, the work is not finished, we finish it. A behavior change requested on a feature already tested and approved: that is an evolution, not a bug.

How do you guarantee a usable application in a few weeks?

An application is not a monolithic block, but a set of independent features. Our adherence to the Manifesto for Agile Software Development and our mastery of lean principles push us to prioritize high-value features from the start. Each feature is specified, developed, tested, accepted and deployed individually. Our Continuous Delivery discipline guarantees easily modifiable code, quickly adaptable to new needs, and an application in a working state at all times. That is what allows us to deliver usable applications from the first weeks, in just a few features.

When does development actually start?

As soon as the quote is signed. We run a framing workshop to identify what will generate the most value for your users (Impact Mapping, OKRs, prioritization). Two options depending on your preference: collaborative or delegated. You get a clear direction from the first week. Development starts immediately after.

What types of software do you build?

Web applications, SaaS platforms, marketplaces, e-commerce, job boards, custom business software, CRM, monitoring, client portals, admin consoles and AI integration into existing applications.

How much does custom software cost?

No reliable tool exists today, according to scientific research, to estimate the cost of developing software. That is why most agencies refuse to show their prices: they rely on estimates that systematically turn out wrong, and the vaguer the project, the higher the quote. But software is not a monolithic block. It is a set of independent features, and that reality changes everything. Since each feature can be specified, developed, tested and delivered individually, the real question becomes: what to deliver first to alleviate your problem as fast as possible? That is exactly what Continuous Delivery, lean and agility enable. At DEVEDANOS, you pay 14,250 EUR/month for delivered features that you have tested and approved. Not promises. The more we add, the more your problem recedes, with the long-term prospect of solving it entirely.

Does the trial period apply to all projects?

The trial period lasts up to 15 working days. During this time, the source code remains hosted on our systems. If you request access to the code before the end of the period, the trial ends and invoicing is due at the end of the month, payable within 15 days.