Most projects that go over budget or over time don't fail because of technical problems. They fail because the brief was vague, and different people had different mental models of what was being built. The developer imagined one thing, the client imagined another, and nobody found out until the first demo.
A good brief is not a technical specification. You don't need to know how to build it. It is a clear description of the problem you are solving, who you are solving it for, what success looks like, and what constraints you are working within. A developer who reads it should be able to produce an accurate estimate and ask the right clarifying questions. Here is how to write one.
Section 1: The Problem and the Goal
Start with context, not a feature list. Describe the situation: who uses this product, what they currently do, and what problem that creates. Then describe the goal: what should be different after the software exists?
Example (too vague): "We need a customer portal."
Example (useful): "We have 200 B2B clients who currently email our support team to check invoice status and submit change requests. This generates about 80 support tickets per week. We want a portal where clients can view their account, see invoice history, submit requests, and track status, so our support team can handle higher-value work."
This framing immediately tells a developer what they're building, who it serves, and how success is measured. It also surfaces requirements that a feature list might not: a status workflow for requests, an invoice data source, user authentication per client account.
Section 2: Who Uses It
Describe your users. Not personas in a marketing sense, just the real people who will interact with the product:
- Clients: who are they? How technical? Mobile or desktop?
- Internal admin users: do you need an admin panel to manage data?
- Third parties: does anyone else need access?
If there are different user types with different permissions, say so explicitly. "Admins can do X, regular users can do Y" is essential information that shapes the data model and auth system.
Section 3: Core Functionality
List the features you need, grouped by user type. Use plain language. You don't need to describe how something works technically. Describe what the user can do.
A numbered list works well here. Be specific about data and states where you know them:
- Client can log in with email and password (reset via email)
- Client can view a list of their invoices with status (paid / unpaid / overdue)
- Client can download a PDF of any invoice
- Client can submit a change request with a text description and optional file attachment
- Admin can see all clients and their request history
- Admin can update the status of a request and add a note
Each of these is a concrete scope item. Vague equivalents ("clients can manage invoices", "admin functionality") will produce wildly different estimates from different developers.
Section 4: What It Integrates With
List any external systems the product connects to:
- Existing databases or software you own
- Payment processors (Stripe, PayPal, etc.)
- Third-party APIs (shipping, mapping, identity verification)
- Internal tools (accounting software, CRM, ERP)
Integrations are significant effort. A brief that doesn't mention them will produce estimates that don't include them.
Section 5: Constraints
| Constraint | Why It Matters |
|---|---|
| Platform (web, iOS, Android, or all three) | Affects technology choice and cost |
| Existing tech stack (if any) | Determines what can be extended vs rebuilt |
| Timeline | Shapes what's feasible in the budget |
| Budget range | Helps the developer propose the right scope |
| Regulatory requirements | GDPR, HIPAA, PCI, iGaming: must be designed in from day one |
| Geography | Hosting region, language, currency |
You don't have to have a fixed budget. But "no budget" briefs make it hard for a developer to propose sensible options. "We want to spend roughly X and understand that may mean phasing the build" is infinitely more useful.
Section 6: What Out of Scope Looks Like
This is under-used but extremely valuable. If you already know what you're deliberately not building in phase one, say so. It prevents developers from quoting for features you don't need, and it protects you from scope creep arguments later.
Example: "Phase one does not include a mobile app, automated billing, or multi-language support. We will consider these after launch."
What a Good Brief Gets You
Agencies and developers vary in how they work, but a brief like this will consistently:
- Produce more accurate, comparable quotes (because everyone is pricing the same scope)
- Surface questions you haven't thought about (good developers will ask about edge cases the brief implies)
- Reduce back-and-forth during development (the brief is the reference, not your memory)
- Make contracts and milestone definitions cleaner
Working With Anointed Coder
When you engage with our SaaS and software development team, we'll work through a structured discovery process to help you turn your idea into a clear specification, especially if you're not sure how to define scope. We ask the questions that produce a brief worth building from.
We work on milestone-based pricing: you see working software before you fund the next phase, and you own all code and IP on payment. Projects typically reach an initial working demo in a few weeks.
If you have a brief already, however rough, send it to us and we'll give you honest feedback and a scoped proposal.
The Short Version
A useful development brief describes the problem, the users, the specific features needed (in plain language), the integrations required, the constraints you're working within, and what is deliberately out of scope. It does not need to be a technical document. It needs to be clear enough that two different developers reading it would produce similar estimates, and ask similar questions.