01
Role-Based Contact Visibility
Separated user access into three tiers (Apex, Non-Apex, Guest) so sensitive direct mobile numbers remain protected.
./Mobile Application/Flutter Mobile Developer
A contact directory app for railway personnel with role-based access.
Indian Railway Telephony Directory gives staff and public users an easy way to locate railway officers across divisions.
- My Role
- Flutter Mobile Developer
- Focus
- Role-based clearance filtering, search speed & native mobile dialing
- Project Type
- Government / Infrastructure Mobile Application
- Timeline
- Android Production Rollout
Search Latency
<50ms
Clearance Tiers
3 Levels
Deployment
Android Google Play
Contact Accuracy
Real-time sync
[01] The Challenge
Operational bottlenecks & constraints.
Keeping personal phone numbers restricted to authorized staff while keeping office landlines accessible to guests.
Making contact lookups instantaneous even with thousands of officers across different zones.
Ensuring officers could update their own details with verification.
[02] Engineering Contribution
Key architectural breakthroughs delivered.
02
Fast Search & Division Filters
Built search filters where users can quickly drill down by zone, division, department, or officer name.
03
One-Touch Calling
Connected native phone dialer and email shortcuts directly from officer profile cards.
[04] Systems Architecture
Data flow & service topology.
01.Flutter mobile application architecture with clean repository patterns
02.Client-side SQLite cache for fast offline lookup
03.SMS OTP mobile verification for internal officer authentication
04.Deep link integration for native phone and email client launch
[05] Delivered Artifacts
- Production Flutter application published for Android
- Multi-tier security gate with SMS OTP validation
- Multi-parameter search and department filtering engine
- Profile self-service update module for railway officers
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