How to Write a Software Requirements Document Without Being Technical

Before any software gets built, someone has to define what it should do. That definition lives in a document. It goes by different names: a software requirements document, a product spec, a scope document, a brief. The name doesn't matter. What matters is that it exists, that it's clear, and that both you and whoever builds your product agree on what's in it. Most founders assume this document has to be written by someone technical. It doesn't. The technical decisions, the architecture, the stack, those come later and belong to your engineers. The requirements document is about what the product does and who it does it for. That's your territory.

What a requirements document is for

A requirements document does three things. It forces clarity: writing down what you're building reveals gaps and contradictions in your thinking that aren't visible when the idea is still in your head. It aligns you and your development team, since every misunderstanding between a founder and an agency starts as an undocumented assumption, and the requirements document is the place to surface those assumptions and resolve them before the build starts. And it protects you: if a dispute arises about what was agreed, the requirements document is what you point to. Without it, you're arguing from memory against someone else's memory.

What to include

A requirements document for a non-technical founder doesn't need to be long or technically detailed. It needs to cover seven things.

1. The problem you're solving

Start here, not with features. One paragraph that explains the problem your product exists to solve, who has it, and why existing solutions don't solve it well enough. This is the most important section in the document; everything else flows from it. If you can't write this paragraph clearly, the rest of the document will be built on an unstable foundation. For example: "Small restaurant owners spend hours each week manually tracking inventory across multiple spreadsheets, often only discovering shortages when they're in the middle of service. Existing inventory software is built for large chains and is too complex and expensive for independent operators. We're building a simple, mobile-first inventory tool that takes minutes to update and alerts owners before they run out of critical items."

2. Who uses it

List every type of person who will use your product and what they can do. Be specific. Don't just write "users," write "restaurant owners who manage inventory" and "kitchen staff who update stock levels." Those are two different user types with different needs, different screens, and different permissions. For each user type, write who they are, what they need to be able to do, and what they should not be able to do. This section shapes the entire architecture of your product, so getting it right early saves significant time later.

3. The core features

List the features your product needs to have at launch, not everything you want eventually, just what's needed for the first version to be useful to a real user. For each feature, write a short description of what it does and why it matters; you don't need to specify how it works technically, that's your development team's job. A useful format: the feature name, what it does in one or two sentences, why it's needed in one sentence, and who uses it. Keep this list shorter than you think it should be. Every feature you add to version one is a feature that delays launch and increases cost. If you're unsure whether something belongs in version one, it probably belongs in version two.

4. What's explicitly out of scope

This section is as important as the features list and is almost always left out. Write down the things your product will not do at launch: features you've decided to defer, integrations you're not building yet, user types you're not supporting in the first version. This section exists to prevent scope creep. When someone asks "can we just add this one thing," your out-of-scope list is what you point to. It also prevents your development team from making assumptions about what's included.

5. User flows

A user flow is a step-by-step description of what a user does to accomplish something in your product. You don't need diagrams or wireframes, plain prose works fine. Write a flow for each of the main things a user will do in your product: for example, an owner adding a new inventory item opens the app, taps "Inventory," taps "Add item," enters the item name, category, current quantity, and minimum quantity threshold, then taps "Save." The item appears in the inventory list, and if quantity drops below the minimum threshold, the owner receives a push notification. These flows reveal edge cases and decisions that aren't visible in a simple feature list. What happens if the owner enters a quantity below zero? What happens if they lose internet connection mid-entry? Writing the flows surfaces these questions before the build starts.

6. Integrations

List every third-party service your product needs to connect to: payments, email, SMS, maps, calendar, identity verification, accounting software. For each one, note what it's used for and whether it's required at launch or can come later. Integrations have a significant impact on cost and timeline, so your development team needs to know about them upfront, not halfway through the build.

7. What success looks like

Write one paragraph describing what the product looks like when it's working well, not a list of features but a description of the outcome. For example: "A restaurant owner can open the app at the start of the day, see their current inventory levels, update quantities after a delivery in under five minutes, and receive an alert before they run out of any critical item. They spend less than 15 minutes per week on inventory management and never run out of key ingredients during service." This section keeps everyone, including you, focused on the outcome rather than the feature list. It's also useful for evaluating whether the finished product does what it was supposed to do.

What not to include

A requirements document written by a non-technical founder should not specify technical implementation: don't specify what database to use, how the backend should be structured, or what programming language to write it in, those decisions belong to your development team, and making them yourself without the expertise to make them well creates problems. Don't specify design details like exact colors, fonts, or layouts unless there's a specific brand reason for it, since UI decisions are best made when you can see them, not describe them in a document. And don't write everything you might ever want. A requirements document is not a wishlist, it's a contract for what gets built in this version. Keep it focused on what's needed to launch something useful.

How long it should be

Long enough to cover the seven sections above, short enough that someone can read it in 20 minutes. For most early-stage products, that's somewhere between 3 and 8 pages. A longer document is not a better document. Clarity is what matters, not length.

What happens after you write it

Share it with your development team before you agree on scope or price. Walk through it together. The questions they ask will reveal gaps you haven't thought of. The things they push back on will tell you where your assumptions don't match reality. Expect to revise it: a requirements document is a living document through the scoping phase, and by the time you start building, it should reflect what both sides have agreed to build, with nothing left ambiguous. Once the build starts, treat it as the source of truth. When questions come up about what was agreed, the document answers them. When someone wants to add something new, the document shows clearly that it wasn't in scope.

A note on doing this with your development team

If you're working with a good agency, you won't write this document alone. They'll run a discovery and scoping process that produces it collaboratively. Your job is to come in with a clear picture of the problem, the users, and the core features. Their job is to ask the right questions and turn that into a concrete plan. What matters is that the document exists and that you understand every line of it before the build starts. Whether you write it yourself or produce it together with your team, it's the foundation everything else is built on.