Production Portfolio

Engineered Systems & Case Studies

A curated list of production-grade systems, mobile applications, and backend infrastructure I have architected and deployed.

DjangoDjango RESTPythonPostgreSQLFirebase AuthJWTWeb Scraping

Alphabell Agrofood Platform & News Scraper

Scalable E-Commerce & Automated Data Ingestion Engine built with Django REST Framework, PostgreSQL, and Python Scrapers.

PROBLEM

Manual data entry for agrofood news was inefficient, while un-indexed PostgreSQL queries led to slow mobile API response times.

SOLUTION

Engineered 12+ RESTful API endpoints using Django REST Framework, architected 3-tier JWT + Firebase Auth, and automated Python scrapers ingesting 500+ articles daily.

Key Features:

Automated Python scrapers ingesting 500+ articles daily into structured PostgreSQL schemas

30% reduction in API response latency by resolving N+1 query patterns and adding indexed lookups

3-tier authentication enforcing role-based access control across mobile and web clients

Cut Flutter API integration bugs by 50% with standardized typed request/response models

Full Case Study

FlutterDartSQLiteREST APIsPlay Store

Cash In Money

Digital cash flow management and mobile payout transaction engine.

PROBLEM

Small businesses required a simple, real-time cash tracking app for field agents.

SOLUTION

Built Cash In Money in Flutter with offline-first SQLite synchronization and instant backend API sync.

Key Features:

Real-time cash flow & ledger tracking

Offline transaction logging

Automated end-of-day balance reconciliations

Full Case Study

FlutterDartKotlinMethod ChannelsRiverpodJWTPlay Store

Easygold

Digital gold investment and savings mobile platform engineered with Flutter for iOS & Android.

PROBLEM

Users needed a secure, instant way to buy, sell, and vault 24K digital gold without physical branch visits or session security risks.

SOLUTION

Architected a feature-based Clean Architecture Flutter mobile app integrated with REST microservices, native biometric authentication, and automated JWT token management.

Key Features:

Live 24K gold rate tracking and instant buy/sell digital gold vault flows

Native biometric authentication (Fingerprint/Face) via Kotlin Method Channels

JWT session security & encrypted local token storage

20% app performance gain via Flutter DevTools profiling

Full Case Study

FlutterDartREST APIsRiverpodAndroidiOSPlay Store

Flashmart Consumer

High-speed consumer e-commerce and instant delivery mobile application built with Flutter.

PROBLEM

Shoppers experienced UI lag and slow catalog browsing during peak promotional flash sales.

SOLUTION

Built a high-performance Flutter mobile application with aggressive image caching, optimistic state updates, and real-time delivery tracking.

Key Features:

Sub-100ms catalog search and category filtering

Real-time delivery driver tracking timeline

Secure checkout gateway integration

Built reusable widget design system from 10+ Figma mocks

Full Case Study

FlutterDartJWTREST APIsPlay Store

Rupiyo Digital

Digital financial payout platform and wallet mobile app engineered with Flutter.

PROBLEM

Users needed a reliable digital credit payout app with zero session hijacking risk.

SOLUTION

Engineered Rupiyo Digital with end-to-end JWT token rotation and secure Android storage.

Key Features:

Instant wallet payout settlements

Hardened JWT session security

Cross-platform Android & iOS support

Full Case Study

FlutterDartMicroservicesREST APIsPlay Store

YRS Payment

Merchant utility billing, collections, and financial payment processing mobile solution.

PROBLEM

Merchants needed a single mobile app to handle utility bill payments, customer collections, and transaction receipts.

SOLUTION

Developed YRS Payment in Flutter with standardized request pipelines across 5+ backend microservices.

Key Features:

Multi-utility bill payment processing

35% faster average API response handling time

Instant SMS & PDF receipt generation

Full Case Study