Frontend
Android (Java/Kotlin)
About Rokomari
Rokomari is Bangladesh's leading online bookstore and e-commerce platform, serving millions of readers and shoppers across the country. As mobile usage started growing rapidly in 2016, the company aimed to expand beyond the web and reach users through mobile applications, ensuring a smoother and more accessible buying experience.
Performance Highlights
3–5x
User growth post-launch
2X
Increase in customer engagement
End-to-end
Improved user journey from discovery to purchase
Unified
Web and mobile experienceacross platforms
Native
Android app built from the ground up
MVVM
Architecture adopted for scalability and flexibility
Beta
A/B testing program launched pre-release
The Challenges
Limited reach with web-only platform
No dedicated mobile app experience
Need for a centralized, frictionless login system
Complex and evolving API infrastructure
Performance limitations of low-end Android devices
Maintaining consistent UX across web and mobile
Difficulty converting casual users into loyal customers
Solutions & Impact
Developed a complete Android application for mobile users to capture mobile-first users during the smartphone boom
Designed unified experience across web and mobile
Adopted MVVM architecture pattern to mirror web UX while respecting Android's design system
Optimized app performance and resource usage to support low-end Android devices
Designed a centralized, frictionless authentication system for mobile users
Built a fully modular codebase to absorb frequent API and infrastructure changes from Rokomari's core team
Collaborated closely with Rokomari's engineering team on component design, balancing brand consistency with platform standards
TechCare’s Journey With Rokomari
2016 — Ideation, Planning & Architecture
Rokomari approached TechCare with a clear goal: expand beyond the web and reach the growing base of smartphone users across Bangladesh. The smartphone boom was creating a new class of mobile-first shoppers, and Rokomari needed a reliable tech partner to bring their buying experience to Android.
TechCare focused on building a complete mobile buying experience before adding advanced features. Key architectural decisions were made early:
MVVM pattern selected for modularity and maintainability
Agile, milestone-based development process established
User journey mapped as the foundation for data flow design
Performance benchmarking set as a core KPI given Android device fragmentation
2016–2017 — Development & MVP
With feature priorities set around the most impactful user actions first, TechCare built and iterated:
Complete end-to-end purchase flow on mobile
Centralized login and authentication system
Integration with Rokomari's evolving API platform
Crashlytics (Fabric) integrated for real-time app health monitoring
2017 — Beta Testing & Launch
Before full release, TechCare ran A/B testing across a selected group of beta users. The existing feature roadmap made it straightforward to track completed, pending, and rework items. Key KPIs monitored through launch included:
API response logging
Latency benchmarking
Android build performance and stability
Security benchmarking and code obfuscation
2017 — Post-Launch Optimization
This approach proved valuable after launch. As Rokomari’s product team requested feature updates and changes, TechCare was able to deliver them quickly without affecting the overall system. This continued to add value beyond the initial project.
Results & Impact
3–5x user growth
Significant user base expansion following the mobile app launch.
2x customer engagement
Doubled interaction rates across key touchpoints and user journeys.
Mobile-first reach
Expanded access to mobile-first users and new market segments.
Stronger retention
Improved UX drove higher customer loyalty and repeat usage.
Tech Stack, How We Built It
TOOLS
Android Studio
LIBRARIEs
Retrofit, Glide, Volley,
Dagger 2
NOTIFICATIONS
OneSignal, Firebase GCM
ANALYTICS
Custom Analytics Framework, Fabric (Crashlytics)
Systems Delivered
USER-FACING MOBILE APP
Full book browsing and purchase experience
LOGIN SYSTEM
Centralized and frictionless authentication
NOTIFICATION SYSTEM
Order updates and engagement notifications
MODULAR ARCHITECTURE
Flexible system for continuous feature updates
Data-Driven Development
TechCare followed a structured and data-driven approach:
API response logging
Latency benchmarking
Integration with Rokomari's evolving API platform
Security benchmarking and code obfuscation
User journey data guided feature prioritization, ensuring
that the most important actions were optimized first.
Challenges We Solved Differently
Unlike typical implementations, TechCare focused on:
Building for low-end device performance
Maintaining cross-platform UX consistency
Handling constantly changing APIs
Creating a future-ready modular system
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