How we replaced an outdated third-party sync with a custom channel manager handling 100,000+ daily updates without a single lost reservation.

Previo relied on an external provider to sync reservations across Booking.com, Airbnb, Expedia and others, but the outdated system was slow, unreliable and outside their control. We stepped in, built a custom Channel Manager from scratch, and gave Previo full ownership of the most critical part of their business.

100%
Ownership of the entire system
100,000+
Daily updates with zero lost reservations
10+
Booking platforms across Central Europe synced

The rescue mission

Client

Previo is the most widely used hotel system in the Czech Republic, serving hotels, guesthouses and apartment providers across Central Europe. Their platform offers an all-in-one solution for reservations, front desk operations, and web and mobile apps.

Challenge

Previo's sync relied on a third-party provider, which was slow, outdated and impossible to control. Any platform outage meant delays, errors or missing data.

Solution

We designed and built a fully custom Channel Manager - a unified engine that reliably syncs availability, pricing and reservations across multiple booking platforms in real time.

Outcome

A fast, stable, and scalable sync system that boosted product confidence, removed third-party dependency, and prepared Previo for expansion into new markets.

An outdated system with a slow third-party sync

Previo handled thousands of bookings, but the external provider created delays, errors, and performance limits. The business could not expand on top of a system they couldn't control.

What we had to work with:

Slow and outdated third-party sync
Zero control over outages or delays
Risk of lost or duplicated reservations
Limited ability to add new booking portals
High dependency on external developers

High booking volume meant no space for failure

For hotels, even a single lost or delayed reservation creates operational chaos. Previo needed a sync engine they could trust, control and scale.

What the client wanted:

A reliable, real-time Channel Manager
Full control over reservation, pricing and availability sync
Architecture ready for high-volume traffic
No risk of lost or mismatched data

A rebuild that powered 100,000 daily syncs without losing a single reservation

We didn't just replace Previo's outdated system, we created a high-performance Channel Manager that was reliable and ready to scale into other markets.

Technical audit & Rescue

We analyzed Previo's external sync limitations, mapped the data journey, and designed the architecture for a new in-house Channel Manager.

Software Development & Scaling

We built a unified API that connects all booking platforms through a single interface. Using Symfony for the application core, RabbitMQ for real-time message processing, and ELK Stack for monitoring, the system handles thousands of requests with zero data loss.

The behind-the-scenes magic

Audit
Architecture redesign
Symfony build
API unification
RabbitMQ queue system
ELK monitoring
Integrations
Testing
Launch

How we replaced a third-party system with a 100% controlled booking engine

By rebuilding the sync system in-house, Previo gained complete control over its most business-critical features. Hotels now rely on a Channel Manager that stays accurate even when booking platforms go down. The new engine strengthens Previo's market position and makes the company ready for international expansion.

What we delivered:

Custom Channel Manager built on Symfony
Real-time sync powered by RabbitMQ
Full data integrity with zero lost reservations
ELK-based monitoring dashboards
Full control over platform integrations

The data that tells the real story

	Before GrownApps	After GrownApps
Sync method	External third-party	Custom in-house Channel Manager
Reliability	Slow and outdated	Everything monitored in real-time
Data	Duplicate bookings	Zero lost reservations
Scalability	Limited	Ready for new markets
Control	None	Full ownership of the entire sync