App Store rating from 2 to 4.6 stars in two weeks

Challenge

Collecto provides shared night-taxi services across Brussels, operating from STIB (Brussels public transport) stops and serving thousands of riders each month. The service is a joint initiative between Taxi Verts and the Brussels-Capital Region, designed to offer affordable late-night transport.

The original Collecto app suffered from an outdated interface, limited features, and poor reliability, reflected in its 2-star App Store rating. Users frequently reported crashes, confusing navigation, and the lack of in-app payments, which forced cash-only transactions with drivers. The experience was pushing riders away from the service entirely.

With growing demand and a reputation to protect, Taxi Verts needed a complete rebuild, not a patch, delivered on an aggressive timeline.

Solution

The team rebuilt the application from scratch using React Native with Expo for cross-platform development, enabling a single codebase to serve both iOS and Android.

On the backend, NestJS provided a structured, scalable API layer. Adyen was integrated for secure in-app payments, eliminating the cash-only friction that had plagued the original experience. The aggressive two-week timeline was met through daily standups and tight iteration cycles.

Key Features

• Shared taxi ordering: Seamless booking from all STIB stops in Brussels
• In-app payments: Cashless transactions via Adyen and Payconiq integration
• Modernized UI: Redesigned interface with intuitive navigation
• Cross-platform: Single codebase for iOS and Android via React Native and Expo

Results

• App Store rating improved from 2 to 4.6 stars
• 2,740 new user accounts created in the first month after launch
• Streamlined payments through Adyen and Payconiq integration
• Enhanced stability with significantly fewer crash reports