Stable, not fragile
Crash-free sessions from 30% to 99%. An unreliable prototype became a product users can rely on.
From a fast-moving MVP to a production-grade booking platform
Buenro started as a fast-built MVP of a social-travel booking app. IntegrIT Solutions took over the mobile architecture, brought the product to stability, performance, and market readiness — and shipped it to the App Store as a production-grade Flutter app.
What changed for Buenro
A fast-built MVP became a stable, high-performance product — hardened in place, without a full rewrite. The impact in numbers:
Noticeably faster
Cold start from 90 seconds to 3 seconds. First impressions drive retention — now it is fast.
Backed by tests
Test coverage from 0% to 85%. Regressions are caught before they reach users; releases become predictable.
Production-grade and shipped
A stable, scalable platform — live on the App Store, on a foundation the team keeps building on.
IntegrIT is a professional full-stack agency – they brought our product so much further. Great collaboration, incredibly pleasant to work with. We will definitely work together again.
Technical depth
Technical details for interested readers
Architecture, stack, and the approach that turned the MVP into a production-grade product.
What we built
Instead of a costly restart, we moved the existing codebase onto a solid architecture — and equipped it with production-grade features and a quality foundation.
New mobile architecture
Clean architecture with BLoC across 36 feature modules — refactored in place, without a full rewrite. Service-locator DI, a reusable design system, and code generation (routing, API clients, assets).
Production-grade features
Stripe payments, real-time chat (Stream), maps (Mapbox), deeplinks (Branch), push notifications, and KYC — cleanly encapsulated behind clear interfaces.
Backend integration
Type-safe API clients (Retrofit/Dio) against a Firebase and REST backend, local cache with Hive for offline capability.
Quality foundation
Multi-flavor CI/CD, Sentry crash monitoring, and a test suite from scratch — test coverage from 0% to 85%.
Architecture at a glance
A clean, modular layering — the basis for a small team to ship fast and safely.
Presentation
Flutter · BLoC
Feature-first UI with BLoC/Cubit state per module; reusable design-system package.
Domain
Use Cases · Entities
Business logic, framework-agnostic and testable — the stable core of the app.
Data
Repositories · Retrofit/Dio · Hive
Repository pattern over type-safe REST clients and a local cache for offline capability.
Integrations
Stripe · Stream · Mapbox · Branch · Firebase
Third-party services behind clear interfaces — swappable and tested in isolation.
Quality & operations
CI/CD · Sentry · Tests
Multi-flavor pipelines, crash monitoring, and 85% test coverage — the basis for stable releases.
Tech stack — and why
| Technology | Rationale |
|---|---|
| Flutter + BLoC | One codebase for iOS and Android with native performance; predictable state management across 36 modules. |
| Clean architecture (refactored in place) | Hardened the existing codebase instead of a costly restart — the product stayed shippable throughout. |
| Firebase + REST (Retrofit/Dio) | Managed backend services plus type-safe, generated API clients for the app. |
| CI/CD + Sentry + tests | Multi-flavor builds, crash monitoring, and 85% test coverage — the prerequisite for stable live operation. |
Lessons learned — transferable
- A fast-built MVP can be hardened in place — without a costly rewrite — when architecture, tests, and CI/CD are deliberately brought up to standard.
- Stability and performance are features: a measurable crash-free rate and cold-start time decide retention and ratings.
- A clean, modular architecture lets a small team grow along — from 2 to 5 engineers, without losing velocity.
A product that needs to get more stable and faster?
Whether an early MVP or a grown codebase — if stability, performance, and a solid architecture are on the agenda, talk to us.