How to prepare a software development brief: what to tell your developers

A good software requirements document answers four questions: what problem we are solving, who will use the product, what it must do in the main scenario, and how the work will be accepted. To get started, a short brief of one or two pages in your own words is enough; the detailed specification is easier to build together with the development team after the task has been reviewed. If you have no spec at all, that is not a blocker: describe what is getting in the way today and what result you need.

What a requirements document is and why the client needs it

A requirements document, often called a spec or a technical specification, records what needs to be built, for whom, and how everyone will know the work is done. It is often seen as paperwork for the developer, but in practice it protects the client first: it fixes expectations before work starts, not after the money and time are already spent.

Without agreements in writing, each side carries its own picture of the product. The client imagines an app with user accounts and payments; the developer imagines a simple form that exports to a spreadsheet. The gap shows up at handover, when fixing it costs the most. Even a short description of the task removes most of these surprises.

A spec does not have to be long. Its job is not to describe every button but to agree on what matters: the goal, the users, the scenarios, the constraints and the acceptance criteria. The rest can be refined along the way if the product is built in parts.

Brief vs full specification: what is the difference

The words “brief” and “specification” are often used interchangeably. They are two different documents for two different stages, and the client usually only needs the first one.

The practical takeaway is simple: the client does not need to sit down alone with a technical specification and figure out the architecture. A good brief is enough, and the details are easier to work out with the team that will build the product.

What to do if you have no spec

Having no requirements document is normal, especially for a first project. A ready-made spec is not required: you can describe the task in your own words. Start with three things:

• What is getting in the way today. Where money and time are lost, what work staff do by hand, what customers complain about.
• What result you need. What changes once the product works: requests arrive on their own, a report builds itself, a customer pays in two taps.
• Who will use it. Customers, staff, partners, an administrator, and on which devices.

That is enough to start a conversation. At JEEKSSHIRE 24, for example, you can describe the task in the request form on the development page: what is getting in the way and what result you need. During the task review we then work out together what to build and break the work into parts. Sometimes this step reveals that you need a bot rather than an app, and it is better to learn that before work begins.

What sections a spec includes: a checklist

If you want to prepare a document in advance, use this table as a checklist. You do not have to fill in every row: an empty section is more honest than invented requirements.

It helps to attach examples: screenshots of products you like, your current spreadsheets, sample documents, customer conversations. One real example often explains more than a page of description.

How to write a software development brief, step by step

If you are writing the document yourself, move from the problem to the details, not the other way round:

1. State the problem in one or two sentences without technical terms.
2. Describe what success looks like: what will measurably change after launch.
3. List the users and what each of them does in the product.
4. Write out the main scenario step by step, as a story: “the customer opens, chooses, pays, receives”.
5. Split features into those required for the first version and those that can come later.
6. List the systems the product must connect to and the data that flows through them.
7. Name the constraints: target deadline, budget range, data storage requirements.
8. Write down acceptance criteria as checkable statements, not “convenient” or “beautiful”.
9. Hand the brief to the developer and ask: what is unclear, what is unnecessary, what could be simpler.

The last step matters more than it seems. A good development team does not just accept a spec; it proposes the simplest solution that delivers the result and points out where requirements can be simplified.

Specs for an app, a bot and an AI agent: what to add

The overall structure is the same, but each type of product has its own questions worth settling in advance.

Mobile or desktop app

State the platforms (iOS, Android, macOS, Windows, web), whether the app needs to be published in app stores, work offline, send notifications or update itself. For desktop apps, note whether you need an installer and access to files on the computer.

Telegram bot or Mini App

Describe the conversation flow: which buttons the user sees, what happens after each tap, who gets notified. Separately, note whether you need payments, broadcasts, an admin panel and a link to your CRM or spreadsheets. Scenarios are covered in more detail in Telegram bot for business.

AI agent

The key parts of a spec for an AI agent are data and boundaries. List the sources (documents, correspondence, knowledge base), the tasks the agent performs and the actions it must not take. Attach real example questions with correct answers: they are used to check the quality of the first version. How such projects work is covered in AI agent for business.

Common mistakes in a requirements document

Most spec problems repeat from project to project:

• A solution instead of a problem. “We need an app” instead of “customers cannot submit a request quickly”. Describing the problem leaves room for a simpler solution.
• Everything at once. Every idea goes into the first version and the launch keeps slipping. It is better to isolate the main scenario and ship it sooner.
• Vague criteria. “User-friendly interface” and “fast performance” cannot be checked. Write what exactly should happen.
• Forgotten roles. The customer's path is described, but not who manages the product from the inside or how.
• Silence on integrations. A link to the CRM, warehouse or payments surfaces mid-project and changes the scope.
• Security left to the end. Access rights and data storage are easier to design in from the start than to bolt on before handover.
• No handover clause. Nothing says the client receives the source code, the rights to it and a description of the product.
• Someone else's template. A spec copied from the internet describes another business and creates a false sense of completeness.

How the spec connects to timelines, MVP and acceptance

The quality of the brief directly affects how accurate the estimate will be. Until the task has been reviewed, a timeline can only be a rough guide: in JEEKSSHIRE 24's experience, a Telegram bot or a small automation usually takes from one to several weeks, the first version of an AI agent takes a few weeks, and a standalone app takes from several months. What drives the timeline is covered in how long app development takes.

If you have many ideas and little certainty, write the spec not for the whole product but for a first version with the main scenario. How to define that version is covered in MVP development: where to start.

The acceptance criteria in the spec later become the checklist at handover. How to accept the work and what should be handed over to the client is covered in how to accept a software project.

How we work with a task at JEEKSSHIRE 24

We start with the task, not the technology. The process looks like this:

1. Task review: we look at what is holding the business back today, where money and time are lost and what result counts as success.
2. Solution and estimate: we propose the simplest solution that delivers the result and break it into parts that can be shown and checked separately.
3. Building in parts: you see working pieces as we go and can change priorities between parts.
4. Checks and release: build, lint and tests pass before deployment.
5. Monitoring and growth: failure alerts and backups.

That is why we do not expect a perfect document from the client. Along with the product, we hand over the source code, the rights to it and a description of how the product is built and released; the terms are set in the contract before work begins. To discuss your task, visit the custom software development page or describe it straight away in the request form.

User stories and acceptance criteria: how to describe features

Features are easier to describe as user stories than as a list of screens. Each story answers three questions: who acts, what they want to do and why. The template is simple: "As a <role>, I want to <action> so that <benefit>." For example: "As a manager, I want to see new requests in one list so that I do not have to search for them in my inbox."

Each story gets acceptance criteria: testable conditions that show the feature is done. They are often written in a Given, When, Then form:

• Given: a customer has filled in the request form.
• When: they click Submit.
• Then: the request appears in the manager's list, and the customer sees what happens next.

This kind of record replaces pages of general wording: the developer understands the scope, and at handover you simply go through the criteria one by one. Features of a web app or customer portal are described the same way: roles, actions and conditions of done.

Project boundaries and change control

The out-of-scope section matters as much as the feature list. It states plainly what this version will not include: for example, a mobile app if the web version launches first, or a warehouse integration if it is needed later. This prevents disputes at acceptance and stops the scope from growing unnoticed.

Changes during the work are normal, especially when the product is built in parts. What matters is that they follow a process:

1. The change is written down: what changes and why.
2. The developer estimates how it affects the timeline and the parts already built.
3. Both sides agree on what the change replaces or postpones.
4. Only then does it go into work, and the specification is updated.

Boundaries are held most strictly in the first version of a product. If you are starting MVP development, the out-of-scope list helps ship the core flow sooner and leave the rest for later releases.