A software brief is the document that turns your idea into something a developer can actually build. Without one, you will spend your first conversation with any development team explaining things that should have been written down, answering questions you have not thought about, and discovering that your idea has more moving parts than you realised.
A good brief does not require a product manager or a technical background. It requires the ability to think clearly about a problem and answer specific questions about it in writing. Most founders can do this in four to six hours if they follow a structured process.
Here is the process.
Step 1: Start with the problem, not the product (30 minutes)
Write down the answers to these questions without thinking about technology at all:
- Who specifically has this problem? (Job title, industry, situation)
- What does their current situation look like without your product?
- What does their situation look like after your product solves the problem?
- What are they doing today to deal with this problem?
- Why is that current approach not good enough?
You are describing a before and after. The brief must be rooted in this before/after, or the development team will build technology without a clear outcome to aim for.
Example:
- Who: Freelance consultants who bill multiple clients hourly
- Before: Tracking time in a spreadsheet, manually calculating invoices, sending them as email attachments, following up on overdue payments via separate emails
- After: Time tracked automatically by client and project, invoices generated and sent from a single tool, payment status visible at a glance, automated reminders for overdue accounts
- Current approach: Spreadsheet + email + manual follow-up
- Why not good enough: Three separate tools, no automation, hours of admin per week, payments often late because reminders are forgotten
This is more useful than "I need an invoicing and time-tracking app." The development team knows exactly what success looks like.
Step 2: Define the users and their actions (45 minutes)
Every software product has at least one type of user. Some have more. Write out each user type and the key actions they need to perform.
For a freelancer invoicing tool:
- Freelancer: log time, create invoice, send invoice, view payment status, send reminder
- Client: receive invoice, view invoice, pay invoice
For each user type, number the actions in the order a user would naturally do them. This is your user flow. It will become the structure of your MVP scope.
If you have more than three user types and more than ten actions per type, your product is too large for a first build. Identify which user type is the most critical and which actions are essential. The rest is post-launch.
Step 3: Describe the core screens (45 minutes)
Draw rough sketches of the key screens. You do not need design skills. Boxes and labels are fine. The purpose is to make your mental model visible and checkable.
For each key action from step two, there is typically one to three screens involved. Sketch them.
What to label on each sketch:
- What the user can see on this screen
- What the user can do (buttons, inputs, links)
- What happens when they do each thing
You will discover gaps in your thinking at this stage. "The user clicks send invoice and then..." what? Where do they go? What do they see? What confirmation do they get? These are the questions a developer will ask anyway. Answering them now is more efficient than answering them during the build.
Step 4: List what the product needs to know (30 minutes)
Every software product stores information. Write down the key objects your product needs to track and the attributes of each.
For the invoicing tool:
- Client: name, email, company, hourly rate
- Project: name, client, start date
- Time entry: project, date, hours, description
- Invoice: client, items, total, status, due date
- Payment: invoice, date, amount, method
This is the beginning of your data model. You do not need to be technical. Just write what the product needs to remember.
Step 5: Define what is included and what is not (30 minutes)
Make two lists.
In scope for version one:
- The user types who are included
- The core actions each can perform
- The essential screens
- The integrations that are non-optional (payment processing, email sending)
Out of scope for version one:
- Features you want eventually but do not need immediately
- User types who are important but not critical for the first version
- Integrations that are nice-to-have
Be disciplined about the out-of-scope list. Every item you add to in-scope adds cost and time. Every item you move to out-of-scope is a test you are deferring until you have market feedback.
Step 6: Answer the questions developers always ask (45 minutes)
These questions come up in almost every first meeting with a development team. Answer them in writing as part of your brief:
- What devices must this work on? (Desktop only, mobile-responsive web, native mobile app)
- What languages or accessibility requirements apply?
- Are there regulatory or compliance considerations? (Healthcare, finance, legal)
- Will users need to sign in? (And if so: email/password, SSO, social login)
- Does this need to integrate with existing tools the business uses?
- What is the target volume? (Hundreds of users, thousands, millions)
- Is there a budget ceiling for infrastructure?
Putting it together
At the end of this four-to-six hour process, you should have:
- A clear problem and user description
- A user flow covering the essential actions
- Rough sketches of key screens
- A data model overview
- An in-scope and out-of-scope list
- Answers to the common developer questions
This does not need to be a polished document. A Word file or a Notion page works. The goal is clarity, not presentation.
Once you have this, use our MVP cost calculator to get an initial sense of what your brief translates to in development cost. Then share it with our team and we will tell you honestly what is realistic to build first, what it will cost, and how long it will take.
A brief that takes you six hours to write can save six weeks of back-and-forth during the build. That is one of the best returns on time in software development.