Mobile & backend engineer

Tahseen Ahamad

I build production mobile products and payment systems. React Native at work, native iOS for my own apps, and backend verification for subscriptions and commerce.

I’m currently SDE 2 at Mogi I/O, leading subscription and payment work for an OTT platform. Independently, I design and ship Apple-platform apps on the App Store.

Selected work

Payment systems at Mogi I/O 2024 to now

Payments and subscriptions for a React Native OTT platform: StoreKit, Razorpay, PhonePe, Tangerine, idempotent webhooks, restores, and entitlement recovery.

React Native · Node.js · StoreKit · Webhooks · AWS
Sine 2026

Private subscription tracking for iPhone and iPad. It reads billing messages on device and warns before renewals, trials, and price changes.

SwiftUI · SwiftData · CloudKit · On-device AI App Store (opens in a new tab) Support (opens in a new tab)
Slope 2026

Local-first fitness tracking for iPhone, iPad, and Apple Watch: trends, HealthKit, private iCloud sync, and no account.

SwiftUI · SwiftData · CloudKit · StoreKit 2 App Store (opens in a new tab) Support (opens in a new tab)
Expences 2026

Spending-only tracking for iPhone, iPad, and Mac. It imports UPI screenshots and extracts amount, merchant, date, and payment method on device.

SwiftUI · SwiftData · CloudKit · PDFKit App Store (opens in a new tab) Support (opens in a new tab)

Writing

Authorized, but never charged Payments · Production
Everything I run fits on one box Infrastructure · Self-hosting
Many models, one terminal AI · Workflow

Experience

SDE 2, Mogi I/O 2024 to now
React Native Developer, CPM India 2023 to 2024
React Native Developer, Mogi I/O 2022 to 2023
Software Developer Intern, Mogi I/O 2021 to 2022