A new feature for your software, in 14 days at a fixed price
A new module in production on your existing product, with scope written on day 0 and the price fixed before work begins.
$ dn3 sprint --repo existing 3 core flows €15,000 4 core flows €20,000 5 core flows €25,000 payment 50% start, 50% release code client-owned from first commit then SPRINT+ €5,000, 7 days
Adding a module on an hourly basis means reopening a project without a defined cost.
| Variable | Hourly vendor | DN3 |
|---|---|---|
| Price | Hourly estimate, revised for each unexpected issue in the code | Fixed price, agreed at the feasibility call |
| Time to release | Weeks or months | 14 days |
| Scope | Defined as work progresses | Written on day 0 |
| Impact on existing code | Checked at the end of the work | Automated tests and daily review of affected parts |
| Subsequent features | A new quote each time | SPRINT+: 7 days, €5,000 |
The first engagement is a SPRINT: DN3 works in the codebase, releases the module and documents it. From then on, each additional feature has a fixed duration and price.
First a SPRINT, then SPRINT+.
SPRINT, 14 days. The first module, at €15,000, €20,000 or €25,000 based on core flows. DN3 works in the existing repository and delivers with tests and documentation.
SPRINT+, 7 days. One additional feature for €5,000, fixed price, paid in advance.
Requirement. SPRINT+ is available only to clients who have completed a SPRINT with DN3.
14 days, 5 phases, 3 client approvals.
A pipeline of agents writes the code; a DN3 engineer leads it and is accountable for it. The client brings a one-page brief; on day 14 they receive a product in production that they own.
Brief
60-minute feasibility call. Scope is locked in writing.
Spec
Agents produce PRD, data model, API and flows. The client approves.
Build
Parallel agents on a fixed stack. Daily human review.
QA
Automated tests, load tests and a session with five real users.
Release
Deploy on the client's domain, analytics on, handover of repository and docs.
Gate 1, D0. Scope locked. Later requests become a new sprint.
Gate 2, D2. Spec approved by the client. From here the build runs with a daily report.
Gate 3, D13. The client approves the production release.
The deliverables of a SPRINT on existing code.
- Module in production on the existing product
- New code in your repository, with branches and pull requests available for review
- Automated tests for the module and the existing parts it affects
- Technical documentation of the module and changes
- Updated deployment pipeline
- Testing report with 5 real users
- Backlog of upcoming features, sized for SPRINT+
- One hour of recorded handover for the internal team
The day-14 rule. If on day 14 the product is not in production with the scope locked on day 0, the remaining 50% is not owed* and DN3 completes the work at its own expense. Scope is written and signed by both parties on day 0.
Conditions
* The rule does not apply when the delay is not attributable to DN3: scope-change requests during the sprint, client approvals or answers not delivered within the gate timelines, or outages of third-party services outside DN3's control, including AI service providers, cloud platforms and network infrastructure. In such cases the remaining 50% remains due under the contract terms.
Technical questions at the feasibility call.
Yes. DN3 accesses the repository as a collaborator and works on dedicated branches with pull requests. The stack, existing tests and deployment environment are checked at the feasibility call.
Web apps, including ones installable on the phone (PWA), on widely used, documented stacks, such as TypeScript, React, Node.js, Python and PostgreSQL. Compatibility is confirmed at the feasibility call, before the price is fixed.
The client, from the first commit. The code is written in your repository.
Critical parts, such as payments, authentication or sensitive data, are identified on day 0 and covered by dedicated tests, daily review and a release approved by the client at gate 3. If the risk cannot be managed within 14 days, the scope is reduced before work begins.
Three questions. Then choose a date and time.
The product type is already set to a module on an existing product. The answers help prepare a preliminary scope.
Promo 30-BLACK-FRIDAY: −30% on SPRINT, 44 left. Saved with the booking.
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