WhatsUp

Aggregated Smart Coupon & Deal Discovery Engine

My Role:Lead Mobile Developer & Data Scraping Engineer

Industry:E-commerce

View on Google Play

Technologies:

Flutter

Dart

Firebase

Google Cloud

The Problem & Market Challenge

Expired Coupons & Fragmented Retail Discounts

Online shoppers waste millions of hours hunting through expired coupon codes and fraudulent discount sites. Retailers offer genuine discounts, but shoppers lack a unified, verified hub that aggregates authentic promotions in real time.

Widespread prevalence of expired promo codes causing shopper frustration.

Scraping and aggregating thousands of deals across hundreds of retailer feeds reliably.

Delivering instant search across tens of thousands of active discount codes on mobile.

Friction in copying and applying promo codes on mobile browser checkout screens.

The Engineering Solution

Automated Coupon Verification Pipeline & Real-Time Discovery App

Built an intelligent discount aggregator that continuously crawls, verifies, and categorizes active coupon codes. Packaged in a vibrant Flutter mobile application with one-tap copy and merchant deep linking.

Key Architectural Decisions & Engineering Highlights

Constructed automated cloud scrapers and affiliate API connectors verifying code validity daily.
Implemented instant fuzzy search across store catalogs with client-side indexing.
Added one-tap clipboard copy and direct merchant checkout redirects.
Engineered crowd-sourced feedback loops calculating dynamic promo code success probability scores.

Core Features & Capabilities

Engineered for Speed, Reliability & User Delight

Verified Deal Verification

Algorithmic and community voting system confirming promo code success rates before display.

Instant Merchant Search

Blazing fast search indexing hundreds of top global and local e-commerce stores.

One-Tap Copy & Deep Link

Effortless one-touch code copy and instant opening of the merchant app or web store.

Category Deal Alerts

Custom notification alerts when discounts go live in user-favorite product categories.

Measurable Impact & Results

Delivering Tangible Outcomes

Saved shoppers significant money on everyday retail purchases while driving qualified high-intent buyers to partner e-commerce merchants.

25,000+Verified CouponsActive discounts indexed and categorized

500+Store CoverageMajor retail brands and online marketplaces

< 20msSearch LatencyNear-instant client-side coupon lookup

15-30%Shopper SavingsAverage discount realized on verified checkout conversions

Engineering Insights & Key Takeaways

•In deal aggregation, data freshness is king; aggressive automated verification is essential to maintain user trust.
•Client-side fuzzy searching provides instant responsiveness regardless of database size.
•One-tap clipboard copy eliminates checkout friction on small mobile screens.
•Community verification scores filter out expired codes faster than scheduled scrapers alone.