Case Study - Technical Management Application
Development of a Technical Management Application for Corsican SME
+35%
Productivity
-40%
Administrative time
-95%
Billing delay
4 months
Project duration
Project Overview
Client: Corsican construction SME (confidential)
Sector: Building and Public Works
Duration: 4 months
Technologies: React Native, Node.js, PostgreSQL, Firebase
Result: +35% productivity, -40% administrative time
Sector: Building and Public Works
Duration: 4 months
Technologies: React Native, Node.js, PostgreSQL, Firebase
Result: +35% productivity, -40% administrative time
Context and Challenges
Initial Situation
Our client, a Corsican SME specialized in public works, managed its construction sites in a fragmented way:
- Team management: Excel sheets and phone calls
- Technical tracking: paper notebooks on construction sites
- Billing: manual and delayed processes
- Communication: no synchronization between office and field
- Reporting: retrospective analyses without real-time data
Consequences:
- Significant productivity losses (50+ hours/month of administrative work)
- Billing delays (3-4 weeks)
- Field tracking errors
- Poor resource planning
- Team dissatisfaction
- Significant productivity losses (50+ hours/month of administrative work)
- Billing delays (3-4 weeks)
- Field tracking errors
- Poor resource planning
- Team dissatisfaction
Project Objectives
- Centralize technical management on a single platform
- Digitize paper processes
- Automate billing and reporting
- Synchronize office ↔ field in real-time
- Increase productivity and profitability
Proposed Solution
Technical Architecture
We developed a complete mobile-first application with three interfaces:
📱 Mobile Application (iOS/Android)
- Interface for field teams
- Offline access with synchronization
- Photo capture/geolocation
- Time tracking and clocking
- Real-time technical tracking
🖥️ Web Dashboard (Responsive)
- Supervisor/office interface
- Overview of construction sites
- Team and resource management
- Reporting and analytics
- Billing exports
⚙️ Scalable Backend
- Secure REST API
- Multi-level authentication
- Real-time synchronization (WebSocket)
- Complete history (audit trail)
- Accounting integration
Chosen Technology Stack
| Aspect | Technology | Reason |
|---|---|---|
| Mobile | React Native | Cross-platform iOS/Android, shared code |
| Web | React + TypeScript | Type-safety, maintainability |
| Backend | Node.js + Express | JavaScript full-stack, scalability |
| Database | PostgreSQL | Structured data, complex queries |
| Real-time | Firebase Realtime DB | Instant synchronization |
| Cloud | OVH Capacloud | Secure local infrastructure |
| Maps | Google Maps API | Geolocation, team tracking |
Developed Features
Phase 1: Construction Site Management (Months 1-2)
✅ Construction Site Creation and Tracking
- Detailed sheet: location, dates, budget, assigned team
- Statuses: planned, in progress, completed, invoiced
- Attached documents and photos
✅ Team Management
- Dynamic worker assignment
- Intervention history
- Individual performance
✅ Tasks and Checklist
- Technical tasks per construction site
- Assigned responsible
- Priorities and dependencies
Phase 2: Field Capture (Months 2-3)
✅ Field Mobile Application
- Start/stop intervention with GPS
- Before/after photos
- Notes and observations
- Automatic synchronization
✅ Integrated Time-tracking
- Real work clocking
- Overtime calculation
- Complete history
✅ Robust Offline
- Operation without connection
- Synchronization queue
- Smart conflict resolution
Phase 3: Automation and Reporting (Months 3-4)
✅ Billing Generation
- Field data import
- Automatic calculation hours/travel
- Pre-filled invoices
- PDF/XML accounting export
✅ Analytical Dashboards
- Construction site KPIs (progress, budget)
- Operational costs vs budget
- Team productivity
- Profitability per project
✅ Exports and Integrations
- Excel report export
- Accounting API integration
- Google Calendar synchronization
Results and Impact
Success Metrics
| Metric | Before | After | Gain |
|---|---|---|---|
| Administrative time/month | 50h | 10h | -80% |
| Billing delay | 3-4 weeks | 3 days | -95% |
| Invoice errors | 15-20% | <1% | -98% |
| Resource planning | Manual | Automated | Real-time |
| Team productivity | 100% | 135% | +35% |
| Client satisfaction rate | 7/10 | 9.5/10 | +36% |
| Operational costs | 100% | 72% | -28% |
Client Feedback
"The application has completely transformed our management. Before, we lost a day per week on paperwork. Now, everything synchronizes automatically. The teams love the mobile app, it's intuitive and fast."
"On the billing side, it's day and night. We manage 30% more construction sites with the same administrative staff. And the data quality is so much better for our accounting."
Business Impact
- ROI in 8 months (depreciation fully covered)
- Additional capacity: 30% more construction sites without increasing staff
- Cash flow improvement: billing 15 days faster = improved cash flow
- Team satisfaction: reduction of tedious tasks, focus on added value
Processus et méthodologie
Approche Agile (Scrum)
Nous avons suivi une démarche itérative avec :
🎯 Workshops de découverte (Semaine 1)
- Observation terrain
- Entretiens équipe (bureau + chantier)
- Mapping processus existants
- Définition backlog
🔄 Sprints de 2 semaines (Sprints 1-8)
- Démos hebdomadaires avec client
- Feedback immédiat
- Ajustements prioritaires
- Tests en conditions réelles
🚀 Déploiement progressif
- Phase 1 : Équipe pilote (1 chantier)
- Phase 2 : Expansion graduelle
- Phase 3 : Déploiement complet
Support et formation
- Formation équipe terrain (2h groupe + 1h individuel)
- Documentation vidéo (15 tutoriels court)
- Support technique réactif (24h réponse)
- Hotline téléphonique première semaine
Apprentissages et bonnes pratiques
Points clés de succès
✅ Implication client forte - Présence hebdomadaire, feedback continu
✅ Conception user-centric - Tests terrain réguliers, ergonomie simplifiée
✅ MVP itératif - Livraison valeur progressive, pas d'attente 4 mois
✅ Données de qualité - Nettoyage et validation avant import
✅ Formation approfondie - Adoption réussie grâce à formation structurée
✅ Maintenance proactive - Support premier mois intensif
Défis relevés
⚠️ Synchronisation hors-ligne robuste → Solution queue + conflict resolution
⚠️ Adoption équipe terrain → UX simplifiée + formation progressive
⚠️ Intégration données legacy → Scripts de migration personnalisés
⚠️ Performance mobile 4G faible → Compression, caching agressif
Opportunités futures
Le client explore maintenant :
- Intégration IA : prédiction coûts, optimisation planning
- Géolocalisation temps réel : traçage équipes, logistique
- IoT capteurs : télémétrie équipements, maintenance prédictive
- Module fournisseurs : collaboration avec sous-traitants
Conclusion
Ce projet illustre comment une application métier personnalisée peut transformer efficacité opérationnelle et rentabilité. En remplaçant processus papier par automation intelligente, nous avons libéré 80% du temps administratif et multiplié la productivité.
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