Hello, I'm
Punit Kumar Gupta
Principal Engineer - iOS & AI-Powered Mobile Solutions
Architecting High-Impact Mobile Solutions with AI Integration
Principal Engineer with 10 years architecting high-impact mobile solutions used by millions across FinTech, Banking, Travel, and Web3. Expert in Swift, SwiftUI, Clean Architecture, payment systems, and performance optimization. Shipped 14+ production apps, managed $2M+ projects. Skilled in AI/LLM integration (Claude, ChatGPT, MCP protocols). Led engineering teams, mentored 10+ engineers, and established technical best practices.
About Me
Principal Engineer with 10 years of hands-on experience architecting and shipping high-impact mobile solutions used by millions across FinTech, banking, travel, and Web3. Specialized expertise across mission-critical domains requiring scalability, reliability, and security.
Technical Excellence: Swift, SwiftUI, Clean Architecture, MVVM, SOLID Principles, Protocol-Oriented Programming, payment systems integration, analytics, and performance optimization. Proven ability to establish engineering standards, design reusable component systems, and deliver stable, scalable mobile platforms.
Leadership & Impact: Led engineering teams through complex architectural migrations, mentored 10+ engineers, established technical best practices, and drove engineering excellence. Strong advocate for code quality, system scalability, and technical leadership across organizations.
AI & Modern Tech Stack: Expert in AI/LLM integration including Claude, ChatGPT, OpenAI Codex, and MCP protocols. Skilled in blockchain technology, Web3 integration, and building next-generation intelligent mobile experiences with AI-assisted development.
Result-Driven: Shipped 14+ production apps, managed $2M+ projects, and consistently delivered high-quality solutions. Track record of rapid feature delivery, improved platform reliability, and enhanced user engagement.
Core Expertise
AI & Developer Productivity
LLM Integration (Claude, ChatGPT, Opus, Sonnet), MCP Protocols, GitHub Copilot, Gemini, AI-assisted Code Generation, Smart Refactoring, Automated Test Generation, AI-Powered Mobile Development, Prompt Engineering.
Engineering Leadership
Technical Leadership, Architecture Reviews, Code Reviews, Mentorship, Agile/Scrum, Stakeholder Management, Cross-Functional Collaboration.
iOS Architecture & Design
SwiftUI, UIKit, Clean Architecture, MVVM, SOLID Principles, Protocol-Oriented Programming, Modular Architecture, Design Systems, Reusable Frameworks.
Mobile Platform Engineering
Swift 3/4/5/6, Objective-C, Cocoa Touch, Auto Layout, Swift Package Manager, CocoaPods, State-Driven Navigation, Deep Linking, Universal Links.
Concurrency & Performance
Swift Concurrency (Async/Await), Combine, GCD, Memory Optimization, Crash Reduction, Instruments Profiling, Performance Tuning.
Networking & Integration
URLSession, REST APIs, GraphQL, Socket Programming, API Design, Caching, Retry Mechanisms, Secure Data Exchange.
FinTech & Payments
Apple Pay, Stripe, Plaid, Coinbase, WalletConnect, UPI, PayPal, Credit Card Processing, 3D Secure & Digital Assets.
Security & Authentication
Data Encryption (AES-256, RSA, ECC), Secure Storage, Authentication Flows, OAuth 2.0, JWT, Face ID, Touch ID, Apple Keychain, Secure Enclave, Passkeys, SSL/TLS, Jailbreak Detection, FIDO, PCI DSS, SOC 2 Compliance.
Analytics & Observability
Firebase Analytics, Adobe Analytics, Insider SDK, Crash Monitoring, User Analytics, Performance Monitoring, Event Tracking.
Testing & Quality Engineering
Unit Testing, TDD, XCTest, Debugging, Crash Analysis, Code Quality, Technical Debt Reduction, Release Readiness.
Product Domains
FinTech, Banking, Digital Payments, Web3/Crypto, Travel & Booking Platforms, Donation Platforms, Enterprise Applications, TestFlight.
BLE & Wearables
BLE Communication, Device Pairing, OTA Updates, Real-time Data Streaming, Device Controls, HealthKit, Wearable Integration, Heart Rate, Sleep Tracking, Activity Monitoring.
Mobile Engineering Leadership
Technical Leadership, Problem Solving, Architecture Reviews, Code Reviews, Mentorship, Agile/Scrum, Stakeholder Management, Cross-Functional Collaboration, Product Strategy, Risk Management.
Cloud, CI/CD & DevOps
CI/CD Pipelines, Git, Build Automation, Release Management, Feature Flags, Remote Configuration, Continuous Delivery, Fastlane, App Store Deployment.
Professional Experience
Principal Engineer (Promoted from Staff Engineer & iOS Lead)
Aug 2024 – Present (Promoted July 2026)- Architected extensible fiat, stock, and crypto payment solutions ensuring compliance, scalability, and future platform extensibility. Integrated Stripe, Plaid, Coinbase, and WalletConnect for secure FinTech capabilities while building blockchain-enabled self-custody wallets and digital asset transaction infrastructure.
- Introduced MVVM and Protocol Oriented Programming to establish engineering standards. Architected end-to-end user journeys including authentication, onboarding, identity verification (IDV), and state-driven navigation with secure networking infrastructure, URLSession, API abstractions, caching, and retry strategies.
- Implemented token lifecycle management, feature flags, remote configuration, and observability across the application. Significantly improved maintainability, testability, development velocity, and long-term platform scalability.
- Applied performance optimization and reusable engineering practices to ensure stability. Delivered data-driven mobile experiences that accelerated feature delivery, improved application quality, and enhanced user engagement.
- Optimized application performance using Instruments (Memory, CPU, and I/O) and mentored engineers on best practices. Led architecture reviews, technical design discussions, and code reviews across the engineering organization.
- Utilized Claude Code for intelligent code analysis, security pattern detection, and architecture optimization across payment and blockchain modules. Collaborated with Product, Design, Backend, QA, and leadership teams to drive technical strategy and successful product delivery.
SDE III & iOS Lead
Feb 2024 – Jun 2024- Led the iOS architecture, system design, and technical roadmap for Cleartrip Middle East and Flyin applications using Swift 5.9, UIKit (Cocoa Touch), MVVM, and SOLID, driving scalable, modular, and production-ready solutions while partnering with engineering leadership on technical strategy and release planning. Utilized ChatGPT for rapid prototyping, technical documentation, and architecture decision analysis.
- Improved platform stability and engineering quality by reducing application crashes by 15%, eliminating critical memory leaks, optimizing API integrations, refactoring legacy modules, and reducing technical debt to strengthen long-term maintainability and release confidence. Leveraged ChatGPT for crash analysis, debugging patterns, and optimization recommendations.
- Architected and delivered mission-critical travel capabilities, including booking flows, deep linking, GraphQL integration, analytics, operational reporting, baggage & passenger insurance, and secure payment workflows using Apple Pay, Credit Cards, 3D Secure, encryption, and secure storage, improving user engagement, conversion, and transaction reliability.
- Owned technical delivery from architecture through production, leading architecture reviews, code reviews, engineering standards, mentoring engineers, and cross-functional collaboration with Product, Backend, QA, Design, Security, and business stakeholders to ensure production readiness, successful market launches, and alignment with business objectives.
- Built reusable platform components and internal frameworks, improving development velocity, application consistency, performance, and release quality while enabling faster feature delivery across both high-traffic travel applications.
iOS Consultant
Aug 2023 – Feb 2024- Developed scalable iOS banking modules for the ENBDX platform using Swift 5, Cocoa Touch, and reusable private frameworks, improving code quality and maintainability
- Integrated Insider SDK for rich push notifications, delivering personalized transaction updates, feature announcements, and customer engagement campaigns.
- Implemented Adobe Analytics across the core platform to track user journeys, funnel drop-offs, feature adoption, conversion metrics, and product usage insights.
- Designed reusable private libraries for networking, analytics, and shared business logic while implementing multilingual support with English and Arabic (RTL) localization.
- Enhanced the banking experience through Core Animation, interactive UI, performance optimization, crash reduction, and continuous feature enhancements for a stable production application.
Senior iOS Developer
Jan 2022 – Aug 2023- Designed and delivered the Add Money module, improving payment workflows and transaction reliability.
- Engineered secure Wallet features, enhancing digital payment and account management experiences.
- Architected and implemented Rupay Credit Card UPI onboarding and payment integration within the UPI ecosystem.
- Developed Aadhaar OTP-based UPI MPIN setup, ensuring secure authentication and regulatory compliance.
- Applied Unit Testing, TDD, and clean code practices to improve application quality and maintainability.
- Leveraged the Backbase Mobile SDK to build scalable, enterprise-grade digital banking solutions.
Senior iOS Developer
Feb 2021 – Jan 2022- Developed and enhanced iOS modules using Swift 5, Cocoa Touch, and Objective-C, including refactoring private CocoaPods to improve maintainability and code quality.
- Designed and implemented an offline peer-to-peer synchronization system where crew devices connected to an onboard Wi-Fi router to share itinerary, order, and payment updates in real time without internet connectivity.
- Built key airline features including meal collection, voucher scanning, order correction workflows, and MileagePlus payments with seamless online and offline support for flight attendants.
- Optimized application performance through architecture improvements and code refactoring, reducing technical debt while improving stability and responsiveness.
- Collaborated closely with Product, Backend, and QA teams to deliver reliable end-to-end features and ensure production readiness.
- Improved cabin crew efficiency by ~20% through automated in-flight ordering, payment processing, and synchronized offline data sharing across connected devices.
iOS Developer
Jun 2019 – Jan 2021- Designed and developed iOS applications from scratch (Dmystifi and School ERP) using Swift 5, Cocoa Touch, Auto Layout, SQLite, and Objective-C maintenance.
- Built the Dmystifi online learning platform with live and recorded classes, video playback, learning progress tracking, and SQLite-based offline content storage.
- Implemented student learning validation to ensure lessons were completed sequentially, preventing users from skipping ahead while tracking total watch time and course completion.
- Developed a real-time school bus tracking system using Core Location, Apple Maps, and custom route animations, enabling parents to monitor bus locations, receive ETA updates, and get push notifications when the bus approached their pickup stop or reached its destination, improving child safety.
- Integrated multiple payment gateways, Apple QR code, interactive charts, and custom animations to enhance user experience and application functionality.
- Optimized local data persistence using SQLite for offline access, synchronization, and improved application responsiveness.
iOS Developer
May 2017 – May 2019- Developed and published multiple iOS applications (Openkart, Aiwa Top-up, LimeT, Mobillo) for the UAE & Oman markets, delivering large-scale e-commerce, recharge, and fintech solutions similar to Amazon and Flipkart.
- Designed and developed a next-generation billing system for Gulf City, integrating BLE-based POS printing to generate invoices directly from iOS devices, improving checkout speed and operational efficiency.
- Implemented multilingual support (Arabic/English), real-time socket communication, and rich push notifications with image, video, and audio attachments to enhance user engagement.
- Built secure payment, mobile recharge, and money transfer features, including Apple QR code integration for seamless and secure transactions.
- Developed VoIP calling applications with custom communication libraries, dialer interfaces, OTP-based authentication, contact management, and comprehensive feature testing for reliable voice communication.
- Optimized application performance, scalability, and user experience through reusable components, robust networking, and production-ready architecture.
Open Source Projects
Personal projects on GitHub
Rick & Morty iOS App
Clean Architecture + SwiftUI + async/await sample app consuming the Rick & Morty API.
Swift View on GitHub →Currency Converter
iOS currency converter app with live exchange rates and a clean SwiftUI interface.
Swift View on GitHub →SPMproject
Reusable Swift Package Manager module, also distributed as a CocoaPod for quick integration.
Swift · MIT License View on GitHub →GraphQL Apollo Demo
GraphQL integration with Apollo Client demonstrating real-time data fetching and caching strategies in iOS applications.
Swift · GraphQL · Apollo View on GitHub →Apps Shipped in Production
Live App Store apps built and maintained across my engineering career
ENBD X
Digital banking app for Emirates NBD Dubai — analytics, push notifications and multi-language support.
View on App Store →Paytm
UPI payments & wallet app — Add Money module, Rupay Credit Card UPI and secure MPIN authentication.
View on App Store →Cleartrip
Travel booking app — flight/hotel booking flows, GraphQL integration and secure payment workflows.
View on App Store →United Airlines (ISA)
In-flight crew app — meal collection, voucher scanning and Mileage Plus payment processing.
View on App Store →Flyin
Middle East travel & booking platform — deep linking, analytics and insurance add-ons.
Find on App Store →OpenCart
Mobile shopping app for UAE & Oman markets built from scratch, similar in scope to Amazon/Flipkart.
View on App Store →Schoofi
School ERP app with Apple Maps bus tracking, attendance management and QR-code features.
View on App Store →BeneFi
Global online donation platform enabling Fiat, Stock, and Crypto donations, connecting donors with charities, nonprofits, and charitable trusts worldwide.
View on TestFlight →Education
Bachelor of Computer Applications (BCA)
Department of Computer Science, Sikkim Manipal University
2014Master of Computer Applications (MCA)
Department of Computer Science, GGSIPU University
2017Master of Business Administration in Information Technology (MBA-IT)
Department of Business Administration, Sikkim Manipal University
2020Get In Touch
Available immediately — open to Staff / Principal iOS opportunities.