Case study
App de suivi de chantiers
Sites documented in realtime, even offline.
Key facts
- Client
- Groupe BTP
- Role
- Senior mobile developer
- Year
- 2024
- Duration
- 8 months
- Stack
- React NativeKotlinSpring BootMySQL
01
Context and problem
A construction group runs dozens of simultaneous sites, often in dead zones. Field surveys were done on paper then re-typed at the office in the evening, while sensors — temperature, humidity, levels — were read one by one.
The problem
Late re-entry, lost photos, incomplete measurements: site documentation lagged by several days and disputes were settled without time-stamped evidence.
02
The solution
An offline-first mobile application: structured surveys with geotagged photos, automatic BLE sensor capture and deferred synchronisation as soon as the network returns. A Spring Boot back office consolidates everything in real time.
Key features
Offline first
Local queue and automatic conflict resolution: the field never waits for the network.
BLE capture
Paired sensors are read in the background and attached to the current survey.
Structured surveys
Forms per trade, annotated photos, on-site signature.
Site dashboard
Progress, alerts and history consolidated for site management.
03
Gallery
A look at the delivered screens — from the main journey to interface details.
04
Results and numbers
What the project changed, measured over time.
100% of surveys time-stamped and geotagged
Every measurement is dated, signed and tied to its site zone.
−90% office re-entry
Deferred sync replaces the evening double entry.
45 sites equipped in the first year
A gradual rollout, without disrupting operations.
4.8/5 average rating from field crews
Adopted by crews who are hardly fans of digital tools.
Let's work together
A product to launch, a platform to harden, a team to reinforce? Let's talk.