Engagement models
Engagement Models for App Development Projects
The right contract structure depends on how well-defined your scope is and how much it will change. We offer three models and help you pick the one that balances predictability and flexibility.
Fixed-Scope Project
Best for: Well-defined MVPs and projects with clear requirements
A defined scope, timeline, and price agreed after a discovery phase. Change requests are estimated individually so the budget stays predictable.
- Predictable budget
- Milestone-based billing
- Best after discovery
- Most flexible
Dedicated Product Team
Best for: Evolving products, roadmaps that change as you learn
A cross-functional team — product manager, designers, engineers, and QA — working as an extension of your company on a monthly basis.
- Flexible priorities
- Stable team & velocity
- Scale up or down monthly
Time & Materials
Best for: Exploratory work, integrations, and ongoing improvement
You pay for actual hours spent, with weekly reporting and agreed budget caps. Ideal when requirements are still forming or work is iterative.
- Pay for work delivered
- Weekly time reports
- Budget caps available
Comparing the three models
| Factor | Fixed scope | Dedicated team | Time & materials |
|---|---|---|---|
| Budget predictability | High | High per month | Medium (with caps) |
| Flexibility to change scope | Low — via change requests | High | High |
| Best starting point | After discovery | Ongoing product roadmap | Exploration or support |
| Billing | Milestones | Monthly | Hourly, invoiced bi-weekly or monthly |
| Your management effort | Low | Medium — you set priorities | Medium |
How to choose
Choose fixed scope when requirements are documented and stable — a defined MVP, a marketing app, or a well-specified internal tool. Discovery comes first so the fixed price reflects real scope.
Choose a dedicated team when you have a product roadmap that will evolve with user feedback, such as a SaaS platform after launch. You get stable velocity and a team that accumulates product knowledge.
Choose time and materials for audits, integrations, prototypes, and maintenance work, where the effort is hard to predict in advance.
FAQ
Engagement questions
Is a fixed price cheaper than time and materials?
Not necessarily. Fixed-price projects include a risk buffer for uncertainty, while time and materials bills actual effort. When scope is genuinely clear, fixed price gives predictability; when it is not, time and materials is usually more cost-effective.
Can we switch models during a project?
Yes. Switching at a milestone, such as after an MVP launch, is common and straightforward.
What does a dedicated team usually include?
Typically a product manager or delivery lead, one or two designers, mobile and backend engineers, and a QA engineer. Composition is adjusted to your roadmap and can scale month to month.
Let's scope your app the right way
Share your idea, current product, or requirements document. We will review it, ask the questions that matter, and send back a phased plan with an estimate range.