How a UI/UX Redesign Made Invoicing Faster for Imperial Security
A security guarding company built its own invoicing tool, then found the interface was slowing the same staff it was meant to help. That was the starting point for our UI/UX work with Imperial Security, a London-based provider of SIA-licensed security guards, door supervisors and event security teams.
Imperial Security had already launched a free invoice maker web app for security guard billing, a genuinely useful idea for an industry where invoicing often runs through spreadsheets and email chains. The tool worked, but the interface hadn't been designed with the day-to-day user in mind, and that gap showed up every time someone sat down to raise an invoice.
The Brief
Imperial Security asked our design team to look at the app's UI/UX specifically, not the underlying billing logic, but how it felt to use. The goal was straightforward: reduce the number of steps between opening the app and sending a finished invoice, and make the interface clear enough that new staff could use it without a walkthrough.
What We Changed
Our team, working through Invisio's UI/UX design service, reworked the invoice creation flow so the most common actions sat closer to the surface rather than buried behind extra clicks. Navigation was simplified, form fields were reordered to match how staff actually fill them in, and the layout was cleaned up so the app reads clearly on the mobile screens most guards and site supervisors use in the field.
None of this touched the app's core billing functionality. The redesign was deliberately scoped to interface and experience, on the basis that a good tool with a confusing front end gets used less than a simpler tool people trust.
The Result
Since the redesign rolled out in 2025, Imperial Security has reported faster invoicing and more positive feedback from the staff using the app day to day. For a company managing security guarding, door supervision and event security teams across multiple sites, a billing tool that people actually want to open is a small change with a real operational payoff.
Why It Worked
Internal tools rarely get the design attention that customer-facing products do, even though the people using them every day notice the friction just as much. Imperial Security's invoice maker is a good example of a tool that didn't need rebuilding, it needed rethinking from the user's side of the screen. That's the same approach we bring to every UI/UX and conversion project we take on, whether it's a customer-facing website or an internal app that staff rely on to get paid on time.
If your team is using an internal tool that's slower or clunkier than it should be, get in touch and we'll take a look.
