Divine Mercy C.

Lead Mobile Developer (iOS) at Toptal

Led mobile application development for iOS using Swift, implementing MVVM patterns and building user-friendly solutions with advanced AI capabilities. Integrated AI Email Ingestion API with OAuth for Apple Mail Sign-In, processed emails with OpenAI LLMs, and presented results in SwiftUI. Implemented Retrieval-Augmented Generation (RAG) with MCP support and real-time updates via Server-Sent Events. Built a comprehensive ride-sharing app featuring geofencing (Core Location), MapKit rendering, 3D/real-time navigation with Mapbox SDK, WebSocket communication, Firebase Cloud Messaging, and secure payments via RevenueCat and Stripe. Set up CI/CD pipelines with Fastlane and GitHub Actions to streamline deployments and troubleshooting.

Lead Mobile Developer at FRESH (Fortune 500)

Led mobile development for a Fortune 500 client, integrating AI email ingestion with Google/Apple Mail sign-in, processing retrieved emails via OpenAI LLMs, and implementing Retrieval-Augmented Generation (RAG) with MCP. Enabled ride-sharing and geofencing using Core Location and CLLocationManager for active/background updates; map rendering with MapKit and Mapbox Navigation SDK (3D/realtime navigation); real-time communication via WebSockets; in-app messaging with Firebase Cloud Messaging; payment processing via RevenueCat SDK and Stripe. Built AI-powered savings/community app; AV Foundation for media handling, real-time geolocation tracking with Core Location, 3D navigation with SceneKit, and deep-linking via custom URL schemes and OAuth 2 for social sign-ins. Core Data for local storage; implemented URL schemes; achieved 99.9% crash-free sessions and 40% reduction in app size.

Lead Mobile Developer at FRESH (Fortune 500)

Led mobile development for Fresh, a Fortune 500 client, building an AI-assisted iOS app. Implemented AI email ingestion and processing with OpenAI LLMs and a retrieval-augmented generation (RAG) workflow using MCP. Implemented sign-in with Google/Apple Mail, server-sent events for processing and displaying data, real-time data flow via WebSockets, geolocation and navigation using Core Location, MapKit/Mapbox, and 3D navigation SDKs. Managed in-app messaging and payments with RevenueCat/Stripe, AVFoundation-based media handling, deep linking, OAuth 2 social logins, local persistence with Core Data, and offline-first architecture. Achieved 99.9% crash-free sessions and 40% app size reduction.

Mobile Developer (Core Integrations) at BIXIE

Integrated machine learning-enhanced banking transaction categorization; designed offline-first architecture for intermittent network connectivity using Core Data, Keychain, and on-device ML integration; real-time transaction processing; implemented advanced in-app analytics, 3D navigation scaffolding where applicable, and robust deep linking. Built end-to-end iOS features with focus on security and performance.

Principal Mobile Developer at KliQR

Developed the Personal Financial Manager app using Core ML for AI-powered transaction categorization for startups. Implemented PDF generation for bank statements using PDFKit, data encryption with Keychain Services, real-time transaction processing with Core Data, custom charts with Core Graphics, and automated testing with XCTest. Achieved a 4.8 App Store rating and 98% user retention.

Remote Mobile Developer – Core Integrations (iOS) at BIXIE

Developed iOS mobile applications with ML-enhanced bank transaction categorization. Implemented MVC patterns and Offline-First architecture using CoreData, Keychain security, and on-device CoreML. Built batch-networking with URLSession, led mobile app team delivering AI-powered savings/community app; implemented AVFoundation for media, real-time geolocation with CoreLocation, 3D navigation using SceneKit, WebSocket API integration, and Crypto wallet integration. Integrated Universal Links, custom URL schemes for deep linking, OAuth2 for social sign-ins, CoreData for local storage, Firebase Remote Config, Analytics, Crashlytics, APNs, and Google Maps API. Achieved 99.9% crash-free sessions and reduced app size by ~40% through optimization.

Principal Mobile Developer at Kliqr

Led development of the Personal Financial Manager app with Core ML-powered transaction categorization; implemented PDF generation for bank statements using PDFKit; implemented secure data encryption with Keychain; real-time transaction processing using Core Data; custom charts with Core Graphics; automated testing with XCTest; delivered high user satisfaction with 4.8 App Store rating and 98% retention; user research-driven product strategy and timely releases.

Remote Founding Mobile Developer (iOS) at KLIQR

Single-handedly developed KliQr’s Personal Financial Manager iOS app using Swift with MVVM patterns, utilizing CoreML for on-device AI-powered transaction categorization. Implemented custom PDF generation using PDFKit, secure data encryption with Keychain, real-time transaction processing with Core Data, custom charts using Core Graphics, and comprehensive testing with XCTest. Achieved a 4.8 App Store rating and 98% user retention; implemented CI/CD best practices and created robust infrastructure following mobile app development standards.

Mobile Developer at Xerde Tech Limited

Frontend iOS and backend Python stack for the Tudo Savings app. Integrated APNs push notifications, Universal Links, Sign in with Apple, AVFoundation for video/camera features, Firebase Analytics for user tracking, and real-time engagement tooling. Built reusable UI components and implemented cross-device synchronization with Core Data and offline support.

Mobile Developer at XERDE Tech Limited

Managed development and deployment of the Tudo Savings app; led front-end iOS/Android development and Python-based back-end; integrated APNs; Sign in with Apple; AV Foundation for video/camera functionality; Firebase Analytics; real-time communication via WebSockets; OAuth 2 for social sign-ins; MapKit; URL routing and deep linking; on-device data handling with Core Data; offline-first architecture; crypto wallet integration; in-app deep linking and URL schemes; focus on performance, security, and scalable architecture.