Mobile application allowing for the home charging with a portable charger

In a nutshell

A mobile application with a backend system for managing and controlling Green Cell’s devices, laying the foundation for a home charging ecosystem. The MVP focuses on Habu, a portable EV charger that can be operated remotely from a smartphone, covering charging process management, device configuration and an advanced statistics system.

Challenges

Green Cell approached us with a project we were glad to take on, not least because opportunities to work with fellow Polish companies do not come along often. The collaboration opened with requirements and needs analysis, followed by technical discussions on application architecture, AWS infrastructure and integration with the device over MQTT. Once the proposal was accepted, our backend work began.

The UX process ran in parallel. Our designer started with extensive research, which quickly turned into close collaboration between the two teams, with Green Cell later taking over UX and UI and finalising the design on the foundation we had built. Once the design was approved, two React Native developers began mobile development, supported across the project by a tech lead, project manager, backend developers, DevOps and a designer.

Our approach

The defining challenge was that we were not building an app for a single device. Habu came first, but the product had to become the entry point to an entire ecosystem, with more devices arriving later. That meant designing for extension from the beginning – without constraining Green Cell’s freedom in UX design or forcing architectural compromises later.

We treated scalability as a requirement of the MVP rather than a later refactor. The result is a product that can absorb new device types as they appear, giving the client room for business expansion without having to reach for a different solution once the ecosystem grows.

Building against hardware that was still evolving

Habu was not a finished product when we started – it was still deep in R&D. Green Cell was implementing the device firmware at the same time as we were building the backend and the BLE integration. Working against a moving target required tight coordination between the software and hardware sides and an integration layer that could tolerate change on the device end without destabilising the application.

Outcomes