MindHack — Tes Kecerdasan
A paid, shareable IQ-style cognitive test for an Indonesian audience. Visitors answer 27 questions across five cognitive areas, get an instant archetype preview on screen, and unlock the full report — estimated IQ against the population, per-area scores, and personal advice — with a one-time Midtrans QRIS payment, delivered by email. Built as a single Next.js 16 app on Server Actions and Postgres, with a concurrency-safe, idempotent payment-to-email pipeline.
- • Paywalled cognitive report unlocked via Midtrans QRIS
- • Archetype-based scoring with a free on-screen preview
All Projects
MindHack — Tes Kecerdasan
A paid, shareable IQ-style cognitive test for an Indonesian audience. Visitors answer 27 questions across five cognitive areas, get an instant archetype preview on screen, and unlock the full report — estimated IQ against the population, per-area scores, and personal advice — with a one-time Midtrans QRIS payment, delivered by email. Built as a single Next.js 16 app on Server Actions and Postgres, with a concurrency-safe, idempotent payment-to-email pipeline.
Essense
A biometric scanner and companion app that recommends fragrance formulas from your skin signals, the weather, and what you've worn before. The Flutter app pairs a biometric scan with AR visualization, an AI scent assistant (Mia), scent-matching, a fragrance journal, and a community feed — alongside a Next.js marketing site.





TrustCrowd© - Crowdsourcing User Acceptance Testing Platform
Trustcrowd is an innovative platform for Crowdsourced User Acceptance Testing (UAT), meticulously designed to enhance tester quality control by implementing an M-X algorithm that effectively manages the inherent variability of tester characteristics. I engineered a robust client-server architecture utilizing GraphQL and MongoDB, which proved instrumental in facilitating scalable and efficient data handling for complex simulations. The user experience was prioritized through a seamless UI, crafted with NextJS and a component-based architecture, ensuring exceptional modularity, reusability, and long-term maintainability.