Custom software development pricingBusiness applications, web and mobile
14,250 EUR/month
Unlimited priority changes, software in production within a month.
15
trial days at no cost
0
regressions tolerated, contractual guarantee
1
production deployment per week
30
days notice to terminate
Not convinced within 15 days: no invoice issued.
A custom software solution, developed continuously and billed monthly at a fixed fee. We frame the work together based on your specific business needs, we build, you accept, we deploy. Every week. This page describes the model in full: what the subscription includes, how you test before committing, and the guarantees that apply from day one.
What the subscription includes
Continuous development, maintenance included.
A dedicated team builds your custom software continuously, 15 working days per month per team member. Web application, mobile app, SaaS platform, e-commerce site, business management software, ERP, CRM, intranet application, back-office or dashboards: whatever the deliverable, you never pay for a frozen requirements document. Corrective, adaptive, preventive, and evolutive maintenance is part of the same subscription: no separate application maintenance contract.
Unlimited priority changes.
You change direction whenever you need to. No amendment, no surcharge, no limit on the number of changes. The software is built to evolve from day one: adapting it to a new need takes days, not weeks.
Zero-regression guarantee.
If a feature you had accepted and approved starts behaving differently after a later modification, we fix it and we lock the behaviour with an automated test so it cannot come back.
Weekly production deployments.
What you have tested and approved goes to production at least once a week. No tunnel development for six months followed by a big bang delivery: you see the real application in production, used by your customers, from the very first month.
The person who writes the code is the one on the line.
No project manager in between, no account executive relaying messages. The person who develops your application is also the one who understands your business and aligns technical decisions with your objectives. This is the best way to avoid lost translations between an account executive, a project manager, and a developer who has never spoken to the client.
Our interests aligned with yours.
A quarterly bonus, written into the contract and indexed on the growth of your revenue. No growth, no bonus. If your project does not generate direct revenue (internal application, for example), the bonus can be deactivated or adapted by amendment.
Start your project in three steps
Our development process runs in three steps.
Discovery call
Thirty minutes. We discuss your situation, your constraints, your challenges and what you are trying to accomplish. No sales pitch. If the timing or scope is not right for working together, we say so.
If we are aligned, we present the offer. Then we prepare the quote together around the problem to solve, at the monthly rate of 14,250 EUR.
A 10 % discount applies to the first month if you sign within 15 days of the call.
Build
We frame with you, then we develop and deploy continuously to a UAT environment that we administer, where you accept each feature as it is delivered. What you approve goes to production.
The zero-regression guarantee applies from day one.
The first month is a trial period: if the work does not convince you, no invoice is issued and you owe nothing.
Production deployment
What you have approved is deployed to production. Every production deployment goes through a continuous deployment pipeline: security, performance, accessibility, everything is verified automatically before reaching production.
In production, we monitor the system continuously: availability, response times, errors. And we measure whether each change delivers the expected value to your users. Corrective, adaptive, and evolutive maintenance runs through the same cycle: no separate application maintenance contract.
Then we start again at step 2. Continuously.
You can terminate the subscription at any time, without justification, with 30 days written notice.
What custom software development really costs
52.1% of IT projects exceed their planned budget.
Average overrun: 80% above the initial estimate.
2/3 of feature improvements generate no measurable value.
Flyvbjerg et al., JMIS 2022 (5,392 projects). Kohavi et al., Microsoft Research, 2009.
With the right approach, the real cost is not the monthly invoice.
It is what you lose every month without software in production.
The solution: a continuous delivery discipline.
Three paths. Only one with a known price before you start.
Predictable cost
Estimation-based pricing (agencies, body shops)
Hiring a developer
DEVEDANOS subscription
First usable delivery
Estimation-based pricing (agencies, body shops)
Hiring a developer
DEVEDANOS subscription
Priority change
Estimation-based pricing (agencies, body shops)
Hiring a developer
DEVEDANOS subscription
Zero-regression guarantee
Estimation-based pricing (agencies, body shops)
Hiring a developer
DEVEDANOS subscription
Alignment of interests
Estimation-based pricing (agencies, body shops)
Hiring a developer
DEVEDANOS subscription
Intellectual property
Estimation-based pricing (agencies, body shops)
Hiring a developer
DEVEDANOS subscription
Exit cost
Estimation-based pricing (agencies, body shops)
Hiring a developer
DEVEDANOS subscription
Trial period
Estimation-based pricing (agencies, body shops)
Hiring a developer
DEVEDANOS subscription
Price
Estimation-based pricing (agencies, body shops)
Hiring a developer
DEVEDANOS subscription
Sébastien Nobour
Software Developer · Founder of DEVEDANOS
“I have seen enough developers holding a project together while the people who sold it had already moved on, to understand that failure is rarely technical.
It is estimation-based pricing that misaligns the provider’s interests with those of the client once the contract is signed.
DEVEDANOS offers custom software development by subscription to deliver every week what matters for your business, with the discipline that protects your investment over the long term.”
Trial period at no cost
15 working days to form your own opinion.
The first month of the subscription is a trial period. We frame with you, then we develop and deploy continuously to a UAT environment that we administer. You accept each feature and we check in every week. If the work suits you, you settle the invoice, the software is yours and we deploy it to production.
At the end of the trial period, you decide. If you are convinced, you settle the invoice and the subscription officially starts. We transfer the intellectual property of the code to you and deploy the application to production for your users. If you are not, no invoice is issued and you owe nothing.
If you request production deployment before the end of the trial period, the trial is validated and standard billing terms apply.
- Production deployment is available upon payment of the first invoice.
- Intellectual property of the code is transferred upon payment of the first invoice.
- During the trial period, the source code remains hosted on our infrastructure.
Zero-regression guarantee
Every approved feature stays stable. Contractually.
A regression is when a feature you had accepted and approved starts behaving differently after a modification made later in the application. Enterprise software that evolves continuously is particularly exposed: every new feature can weaken an existing one if the continuous delivery engineering discipline is not respected.
Our commitment is contractual. If a regression is introduced, we fix it and we add an automated test that verifies the expected behaviour on every future change: the regression cannot come back through the same door.
What the guarantee covers
- The behaviour of features you have accepted and approved, for the duration of the subscription.
What it does not cover
- A change request on an existing feature (that is an evolution, not a regression).
- A defect found during acceptance testing of a new feature (the feature is not yet delivered).
- A failure of a third-party service that the application consumes.
This guarantee is the reason automated tests are integrated into the development process from day one. Every modification, whether a new feature or corrective maintenance, goes through a continuous deployment pipeline whose automation ensures the traceability of every change through unit tests, integration tests, acceptance tests, mutation tests, and performance tests before reaching production. This is also the reason our delivery pace holds steady over the months, instead of slowing down under the weight of accumulated code.
Frequently asked questions about the offer
What is the daily rate, and why a monthly fixed fee?
The daily rate is 950 EUR/day. The monthly fee is 14,250 EUR for 15 working days of development per team member, which works out to the same daily rate. The monthly fee is preferred because it matches the reality of the work: building useful software requires continuity, not scattered half-days. The fixed monthly fee makes the budget predictable: a fixed monthly invoice, with no surcharge for licences or number of users.
How does the trial period work?
The first 15 working days of work are a trial period. You accept features as they are delivered. If at the end you are convinced, you settle the invoice and the subscription starts. If you are not, no invoice is issued and you owe nothing. The code produced remains the property of DEVEDANOS during the trial period and is transferred to the client upon payment of the first invoice.
What exactly does the zero-regression guarantee cover?
It covers the behaviour of features you have accepted and approved, for the duration of the subscription. If one of them starts behaving differently after a later modification to the application, we fix it and we lock the behaviour with an automated test. It does not cover change requests on existing features (that is an evolution), nor defects found during acceptance testing of a new feature (the feature is not yet delivered).
Is there a minimum commitment duration?
No minimum commitment duration. You can terminate the subscription in writing at any time, without justification. The subscription starts at 15 working days per month per team member. This volume can be adjusted by mutual agreement with 30 days written notice.
What is the Early Start Discount?
If you sign the contract within 15 days of the discovery call, a 10 % discount applies to the first month of the subscription.
Is there a bonus when the project succeeds?
Yes. A quarterly bonus, written into the contract, is calculated on the growth of your revenue. The scale is progressive: no bonus below 20 % growth, then 10 to 15 % of the increase depending on the tier reached. The obligation persists one quarter after the contract ends, to measure the impact of the last deliveries. The mechanism is detailed in the contract. If your project does not generate direct revenue (internal application, management tool), the bonus can be deactivated or replaced by another measurable variable, by amendment.
Who actually works on the project?
Software developers with the technical skills to cover the development process end to end: understanding your business and commercial objectives, aligning technical decisions with your strategy, specifying, developing, testing, deploying. No intermediate project management layer, no account executive relaying messages. When your project requires more than 15 days of work per month, a focused development team is assembled. The person you deal with is the one who understands your business, writes the code, and makes the technical decisions on your project.
Do you use an agile methodology?
Consulting firms, body shops, and their consultants sell agile methodologies: Scrum, SAFe, ceremonies, sprints, estimates, release planning. They add bureaucracy where less is needed. They replace steering by outcomes with steering by velocity, and end up slowing down the teams they were supposed to accelerate.
We returned to the essence of agility, without these deviations, by following the Manifesto for Agile Software Development (do not be put off by its dated appearance). Sébastien Nobour, founder of DEVEDANOS, is co-signatory and certified by Dave Farley on the Continuous Delivery discipline. Our DevOps culture means the same people who develop are also the ones who deploy and monitor in production.
Concretely, every modification goes through a deployment pipeline in three stages: fast verification (unit tests, type checking, static analysis), business validation (acceptance tests), and quality control (performance, security, accessibility). Code is managed in a shared version history (Git). Rather than parallel versions isolated for weeks, we integrate our changes into the main version daily, because the more frequent the integrations, the simpler and safer they are. The result: at least one production deployment per week.
What happens if I stop the subscription?
You can terminate the subscription in writing at any time, without justification. A one-month reversibility period begins: we document, transfer, and support you through the transition. Your software is already in production, functional, and your property. You keep the source code, the documentation, the test environment, and the acceptance testing history. The application keeps running: nothing is locked in, nothing depends on a black box on our side.
What does custom software maintenance include?
Corrective maintenance (bug fixes), adaptive maintenance (dependency updates, security patches, browser compatibility), preventive maintenance (refactoring, performance optimisation), and evolutive maintenance (new features) are all part of the subscription. No separate contract, no per-ticket billing.
In the traditional model, one provider builds and delivers, then another handles application maintenance under a different contract. The problem: a maintenance contract funds bug fixes, not product evolution. Your software freezes while your market moves. The model creates a perverse incentive: the provider bills per fix, so every bug not resolved at its root generates recurring revenue. When the same IT staffing firm delivers the project and wins the maintenance contract, they profit twice.
Software in production is not a finished product: it keeps evolving for as long as your business evolves. At DEVEDANOS, the same team develops, tests, deploys, and maintains your software continuously, in the same pipeline.
Ready to discuss your project?
A 30-minute call, no sales pitch. If the offer described on this page looks close to what you need, the best next step is to talk about it concretely.
No commitment. We discuss your situation.
Les conditions détaillées figurent dans le contrat de prestation. En cas de divergence, le contrat fait foi.