Before you hire a developer, write a technical brief. It doesn't need to be a 40-page specification document. It doesn't need diagrams or flowcharts. It needs to answer a handful of essential questions clearly enough that a developer can read it and understand what they're being asked to build.
Founders who skip this step almost always regret it. Estimates come back vague or wildly different from each other. Developers start building the wrong thing. Scope creep sets in within the first two weeks. A technical brief fixes all of that before it starts.
Start With What the Product Does
Write one or two sentences that describe what your product does and who it does it for. Be specific. "A platform that helps freelancers track invoices and get paid faster" is useful. "A disruptive B2B SaaS solution" is not.
Once you have that sentence, write a short paragraph on the problem you're solving. Not the opportunity, not the market size. The problem. What is frustrating or broken for your users right now, and how does your product fix it?
Define Your Users
Who will use this product? Describe your primary user in plain terms. Their role, their technical comfort level, how often they'll use the product, and what device they'll use it on. If there are multiple user types, for example an admin and a regular user, list both and explain what each one can do.
This matters more than most founders expect. A product built for a 60-year-old non-technical user needs different interface decisions than one built for a developer using an API. If you don't tell your developer, they'll guess.
Map the Core User Flows
A user flow is the sequence of steps a user takes to complete a task. You don't need software to document these. Write them as numbered lists.
For example: 1. User signs up with their email. 2. They are asked to connect their bank account. 3. They see a dashboard showing their last 30 days of income. That's a user flow. Do this for the three to five most important things a user will do in your product. These become the scope of your MVP.
Be Explicit About What You Are Not Building
This is the section most founders leave out, and it's one of the most valuable. List the features you are deliberately leaving out of the first version. Mobile app? Not yet. Multi-language support? Not in scope. Advanced analytics? Later.
Being explicit about exclusions prevents developers from gold-plating the product and keeps the project focused. It also signals to any developer you speak with that you've thought this through.
Describe What Success Looks Like
What does a finished product look like to you? Not in terms of revenue or users, but in terms of functionality. What should a user be able to do from start to finish by the time the project is complete? Write this as a short acceptance checklist. If you can tick every item on that list, the project is done.
You should also note any hard constraints here. Budget range, timeline expectations, any technical requirements like a specific hosting environment or a third-party integration that must be included from day one.
Keep It Short and Honest
A good technical brief is usually two to four pages. It's not a contract and it's not a final specification. It's a starting point for a productive conversation with a developer. The goal is to give them enough context to ask the right questions and give you a realistic estimate.
If you're not sure where to start, try writing it as if you're explaining your product to a smart friend who knows nothing about your industry. Clear, direct language is always better than technical jargon you've picked up along the way.
At Cystall, we work with founders at exactly this stage. If you have a brief, even a rough one, we can tell you quickly what's realistic, what needs more thought, and what it will take to build. Reach out and we'll take a look.