Daffa Putera Kouseina
iOS · Flutter · React Native (Indonesia)
I build native and cross-platform mobile apps, from client engagements to products people use every day. 5+ years shipping iOS, Flutter, and React Native apps from idea to store release.
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Dealjava
Swift · iOS
Deals and vouchers across Indonesia. Discounts from restaurants, salons, and more, redeemable in major cities like Jakarta and Surabaya.
- Implemented voucher reservation and redemption with QR code scanning
- Integrated interactive map-based discovery for nearby deals
- Integrated Midtrans payment gateway with full transaction history tracking
- Built refund request and processing flow for failed or cancelled redemptions
- Implemented social auth via Google and Apple Sign-In
- Hardened account security with Keychain-backed credential storage, biometric (Face ID/Touch ID) login, and OTP verification
- Set up push notifications for deal alerts, reservation status, and refund updates
- Built a Spotify Wrapped-style yearly recap feature summarizing user activity and savings
- Built a separate Flutter merchant app with its own payment processing for partner outlets
- Built gamification features including recipe and ingredient trading system
- Designed an in-app game store and market with a gacha system for collectible rewards, built in SwiftUI
- Implemented short-form video feed for promotional content
- Set up Fastlane automation and Firebase for streamlined builds, distribution, and crash/analytics monitoring
Powers live shopping, payments, and rewards for real users nationwide, on a stable, App Store–compliant release pipeline built with Fastlane and Firebase for distribution and crash/analytics monitoring.
How a large native iOS product holds together: security, payments, automation, and playful features all shipping on one release cadence.
Coin Fest Hacker House: from local contests to an international Web3 stage
StoryMy first fully-English, international hackathon. Old teammates, an unfamiliar Web3 stack, a villa in Bali, and the exact moment we realized we'd built the wrong thing.
Invofest 2019: my first hackathon, and the birth of WhyCode
StoryGrade 11, zero web experience, and an idea to help people find a tailor. An offline computer, a dorm that smelled like a duck pen, and an executive-train ride home: the origin of a team that stuck together for years.
Let’s build something.
Open for iOS freelance and full-time opportunities.
kouseinadaffa@gmail.com