How to Write a Software Requirements Document Before Hiring Developers

If you send three development companies a two-line idea, you will get three quotes that cannot be compared, because each team is guessing at a different product. A software requirements document fixes that. It does not need to be long or technical. It needs to explain what problem you are solving, for whom, and what "done" looks like.

Quick answer

• Start with the business goal and the users, not with screens.
• List features as short user stories and mark each one as must-have or later.
• Name every integration (payments, CRM, SMS, accounting) and every data import.
• Add acceptance criteria so you and the developer agree on when a feature is finished.
• Five to ten pages is enough for most first versions.

Why it matters before you hire

• Comparable quotes. Every vendor prices the same scope.
• Fewer change requests. Most budget overruns come from features nobody wrote down.
• Faster start. The team can begin design and architecture in week one instead of week four.
• A record of decisions. When someone asks "why does it work like this?", the answer is written down.

What to include

1. Problem and goal

Two or three sentences. What is broken or missing today, and how will you know the software worked? For example: "Field staff record orders on paper and we re-type them at night. Goal: orders reach the warehouse within 10 minutes, with no re-typing."

2. Users and roles

List each type of user and what they need to do. Customers, admins, managers and support staff often need very different screens and permissions. Roles drive a lot of the cost, so do not skip this.

3. Features as user stories

Use the format "As a [user], I want to [action] so that [benefit]." Then mark priority:

• Must-have for launch
• Should-have soon after
• Later ideas you do not want to lose

Being strict here is the single best way to control cost. Our MVP development guide explains how to cut a feature list down to a first version.

4. Integrations and data

Name the systems the software must talk to: payment gateway, CRM, ERP, accounting software, SMS or WhatsApp, email, maps. Note any existing data that has to be imported, such as customer lists or product catalogues, and roughly how much there is.

5. Platforms

Web app, Android, iOS, or all three? Which browsers and devices must it support? If you are unsure about mobile, read Flutter vs native development first.

6. Non-functional requirements

• Expected number of users and how fast you expect that to grow
• Languages the interface must support
• Security and privacy needs, including where personal data is stored
• Uptime expectations and support hours

7. Acceptance criteria

For each must-have feature, write one or two testable sentences. "An order is visible in the warehouse dashboard within one minute of submission" is testable. "Fast order syncing" is not.

8. Constraints

Budget range, target launch date, and anything fixed, such as an existing hosting provider or a technology your team already uses. Sharing a budget range is not a weakness. It lets vendors propose what fits, instead of quoting the most expensive version.

What to leave out

• Pixel-perfect designs. Rough sketches or screenshots of products you like are more useful.
• Database tables and technical architecture, unless you have an in-house technical lead.
• Vague wishes like "user-friendly" or "scalable" without a measurable meaning.

A simple template

1. Project name and one-line summary
2. Problem today and business goal
3. Users and roles
4. Must-have user stories with acceptance criteria
5. Should-have and later features
6. Integrations and data import
7. Platforms and devices
8. Non-functional requirements
9. Budget range, deadline and constraints
10. Open questions you want the vendor to answer

Once it is ready, use our checklist on how to choose a software development company to compare the replies.

Frequently asked questions

How long should a software requirements document be?

For most first versions, five to ten pages is enough. It should cover the goal, users, prioritised features, integrations, platforms and constraints. Large enterprise systems need more detail, usually produced together with the development team during discovery.

Do I need a technical background to write one?

No. Describe the business problem, the users and what they need to do in plain language. A good development partner will turn that into technical specifications and ask questions where something is unclear.

Is an SRS the same as a project brief?

A project brief is usually shorter and focuses on goals, budget and timeline. A software requirements specification (SRS) adds detailed features, user roles, integrations and acceptance criteria. For hiring a development team, a brief plus prioritised user stories is often enough to get accurate quotes.