From a Mobile App to a Growing Platform: Building WATTEE's Foundation for Smart Energy Control

3+ years of continuous partnership (since 2023) · Core team: developer + delivery manager + designer · [TBD: number of connected households/installations]

The Client

WATTEE is a Czech startup building a system for managing and optimizing energy flows. Their technology lets households, communities, and companies connect different energy devices — solar panels, battery storage, EV chargers — into a single system, track consumption, and control how energy moves between them.

When WATTEE came to us, they had a mobile app built on Flutter. It worked, but it only covered part of what they needed, ran on phones only, and didn't look or feel like the product they wanted to become. As WATTEE set out to serve not just individual households but communities and industrial customers too, a mobile-only app wasn't going to carry that ambition — growth would have meant hitting the same walls again and again.

"The Flutter app worked, but it was clear we needed something more — especially on the web. We wanted a system that would grow with us,"

— Lukáš Jablončík, CEO WATTEE

Our Solution

We didn't start by rebuilding everything at once. The first step was narrow and concrete: build a web front end on top of a design WATTEE already had ready, talking to Thingsboard — the backend system that connects and monitors all their physical devices in the field.

That part of the work carries real weight: this isn't a typical business app where a bug shows the wrong number on a screen. It's software that talks to real solar inverters, batteries, and chargers, so it has to behave correctly and predictably every time. That kind of integration takes real experience with hardware and IoT systems — not just clean code, but code that fails safely even when a device sends unexpected data.

From there, the scope grew with the product, one step at a time. We added a backend with its own logic for how devices behave and interact with Thingsboard, laying the groundwork for automated control of a user's energy network. We built a native mobile app alongside the web version. And when WATTEE's product design evolved, we delivered a full redesign of the application — work that continues today as the platform keeps evolving.

Built on Laravel, integrated with Thingsboard, and delivered both as a browser-based app (no install needed) and a native mobile app.

How We Work Together

We've worked with WATTEE on a Time & Material basis since 2023 — WATTEE pays for the work actually done rather than locking a fixed scope upfront, which matters because their product has kept changing shape. That's exactly what happened here: the engagement grew from a web front end to a native app to a full redesign, without needing a new contract or negotiation each time.

A delivery manager is WATTEE's single point of contact throughout, backed by a small, consistent core team — the same developer and designer who've been on the project from early on, not a rotating cast.

The Result

The WATTEE platform today is the central hub for managing energy devices — whether that's a home solar installation, a community energy network, or an industrial setup. [TBD: add a concrete scale figure once available]

The clearest sign of how the collaboration has gone: WATTEE hasn't just kept us on — they've kept expanding what we do together, year after year, from a single web app to a native app, a full redesign, and now AI-powered features for automated energy control. That's not something a client does with a partner who isn't delivering.

What started in 2023 as a tightly scoped PWA project is now a 3+ year, ongoing partnership — and the platform is still evolving.