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CASE STUDYFINTECH · REALTIME CRYPTO TRADE TERMINAL IOS

Wealth42

A rebuilt iOS crypto trade terminal with real-time order books, leverage and cross-margin controls, and UPI deposits, backed by a multi-channel Redis notification service.

51Weeks operated
2k+Hours of work
4Engineers

The brief

Enable Pi42 (Bengaluru-based crypto/blockchain company) to accelerate delivery of their iOS trading app and backend infrastructure by augmenting the team with Antino engineers — initially scoped around a notification service and database migration, then expanding to full-feature iOS trade terminal development across the engagement year.

What we built

A full-stack cryptocurrency trading platform augmentation across two product lines:

  • Backend — a BullMQ/Redis-powered multi-channel notification service (SMS/email/FCM push), and a custom MongoDB→PostgreSQL migration for the Taxnodes crypto tax product with full application layer adaptation.
  • iOS — a ground-up rebuild of the trade terminal with real-time order book, TPSL, leverage controls, cross-margin trading mode, advanced order types (Stop Market/Stop Limit), USDT compliance gating, UPI INR deposit flow, nominee management with PEP compliance, feature flags, deep link notifications, and a full analytics SDK suite (Branch.io, Clarity, Appsflyer, Facebook SDK). The result is a production-grade crypto futures exchange iOS app with regulatory compliance flows and a migrated, scalable backend.
⊛ Live in production

Production iOS app on the App Store with: new trade terminal (order book, TPSL, leverage, cross-margin, Stop Market/Stop Limit, Close All Positions), UPI deposit flow, nominee management, USDT compliance, analytics SDK suite, and deep-link notifications. Backend: PostgreSQL-migrated Taxnodes tax reporting product live in production with multi-channel notification worker service operational.

How it was built, phase by phase.

8 workstreams across 51 weeks of operated delivery

  1. (001)BUILDWeek 1–4 (Jan 8 – Feb 2, 2024)

    Notification Service Architecture

    Built a production-grade notification worker service from scratch using BullMQ and Redis, supporting SMS (MSG91), email, and Android FCM push notifications with resend mechanisms and sandbox environments.

    ✓ Fully operational notification worker service with email, SMS, and Android push notification support deployed on dev environment

    BullMQRedisFirebase FCMAPNMSG91Node.js
  2. (002)INTEGRATEWeek 5–12 (Feb 5 – Mar 28, 2024)

    MongoDB to PostgreSQL Data Migration

    Designed and executed a custom (no third-party tool) migration of the entire taxnodes product database from MongoDB to PostgreSQL, including schema creation, data integrity resolution, and application-layer adaptation.

    ✓ Production database fully migrated from MongoDB to PostgreSQL with taxnodes application, worker, and rate-server repositories updated and validated

    MongoDBPostgreSQLPrismaNode.jsEC2
  3. (003)STABILIZEWeek 9–14 (Mar 1 – Mar 29, 2024)

    Taxnodes Crypto Tax Reporting Engine

    Stabilized and extended the taxnodes crypto taxation product: fixed file upload validation for multiple crypto providers, repaired transaction APIs, and ensured end-to-end report generation on the new PostgreSQL backend.

    ✓ End-to-end crypto tax report generation pipeline validated across multiple crypto exchange providers on new PostgreSQL production environment

    PostgreSQLPrismaNode.jsBullMQEC2
  4. (004)BUILDWeek 17–23 (May 1 – Jun 11, 2024)

    iOS Nominee Management Feature

    Implemented a full nominee designation flow in the iOS app including custom OTP verification screen, checklist bottom sheet, PEP compliance popup, share allocation (double format), and know-more informational flow.

    ✓ Nominee designation feature shipped to production iOS app with full API integration and compliance checks

    iOSSwiftREST APIs
  5. (005)BUILDWeek 20–26 (May 20 – Jul 2, 2024)

    UPI Payment Integration (iOS)

    Built a new UPI deposit flow in the iOS app featuring a circular countdown timer, new deposit type selection screens, and updated deposit UI — enabling INR fiat-to-crypto onramp via UPI.

    ✓ UPI deposit flow launched in production iOS app enabling INR on-ramp for crypto trading

    iOSSwiftUPI APIs
  6. (006)INTEGRATEWeek 22 & 40–51 (Jun 4 + Sep 30 – Dec 24, 2024)

    Analytics, Deep Links & Onboarding Hardening

    Integrated Branch.io universal links, Microsoft Clarity SDK, Facebook SDK, and Appsflyer event tracking; added deeplink-triggered notifications routing; revamped KYC/bank onboarding flow with UUID tracking.

    ✓ Growth attribution, session recording, and onboarding funnel tracking fully instrumented; KYC/bank onboarding flow hardened with UUID traceability

    Branch.ioMicrosoft ClarityFacebook SDKAppsflyeriOSFirebase
  7. (007)BUILDWeek 27–33 (Jul 3 – Aug 9, 2024)

    Advanced Trade Terminal (iOS)

    Rebuilt the entire trade terminal UI on iOS from scratch over 6+ weeks, incorporating order book, TPSL (Take-Profit/Stop-Loss) calculations, leverage slider, open positions, trade preferences.

    ✓ New trade terminal released to App Store with hot-fixes applied; real-time trading fully operational on iOS

    iOSSwiftWebSocketsREST APIs
  8. (008)BUILDWeek 38–43 (Sep 19 – Oct 23, 2024)

    Cross Margin & Advanced Order Types

    Implemented cross-margin trading mode, USDT compliance regulatory flow, Stop Market/Stop Limit order types, Close All Positions, and cross-margin P&L calculations across trade terminal and open positions.

    ✓ App Store build approved and live with cross margin, USDT compliance, and advanced order types — monitored post-launch for stability

    iOSSwiftREST APIsAppsflyer

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