Everything was manual. Slow. Error-prone.
This construction business was managing its full operations with zero digital system in place. Orders were getting delayed. Tracking was a mess. Communication between buyers and suppliers kept breaking down. Not because people weren't trying, but because there was no infrastructure to hold it together.
"They didn't just need an app. They needed something that actually worked on-site."
The client needed a B2B marketplace capable of handling the full transaction flow, from quote request to payment to real-time delivery tracking, on both iOS and Android. The app had to be usable by people on construction sites, not just office workers behind a desk.
A two-sided B2B marketplace in Flutter
The app needed to serve two distinct user types simultaneously: buyers and suppliers, each with their own workflow and expectations. We built it as a single Flutter codebase deployed to both App Store and Play Store.
- Buyers browse suppliers, request quotes, and compare pricing in real time. No calls, no waiting.
- Suppliers receive requests on their phone, send quotes, and confirm orders from wherever they are.
- Payment gateway processes the transaction once both sides agree. Clean, traceable, no cash handled.
- Live delivery tracking so buyers know exactly when their concrete arrives. No more "it's on its way" calls.
- Push notifications at every step of the flow: quote sent, accepted, payment confirmed, driver dispatched.
The architecture used Riverpod for state management with a clean separation between data and UI layers, making it maintainable as features were added post-launch.
B2B apps have zero tolerance for failure
Consumer apps can have rough edges. Users will tolerate a crash if the core experience is good. B2B apps can't afford that. When a payment fails on a $10,000 concrete order, or a delivery notification doesn't arrive and a crew waits idle on-site, the cost is immediate and real.
We stress-tested every edge case in the payment flow, built retry logic for notification delivery, and designed the tracking UI to degrade gracefully when GPS signal was intermittent on construction sites.
"Building for B2B taught me to think about reliability, edge cases, and offline scenarios in ways consumer apps don't demand."
Operations are managed digitally. Teams rely on it daily.
Construction buyers who used to spend 30+ minutes per order (calls, negotiations, confirmations, follow-ups) are now completing transactions in under 5 minutes. The system handles the back-and-forth automatically.
Most apps look good. Fewer work in real environments.
This project sharpened my understanding of what it means to build for industries where the stakes are high. It's not about features. It's about reliability under real conditions. A construction site is not a coffee shop. The users are not patient, and they shouldn't have to be.
If you're running a business that still manages transactions over WhatsApp, there's an app for that. And it might be simpler to build than you think.