Rajinder P.

Why Work With Me? • 2500+ hours on Upwork—proven track record of reliability and expertise. • Trusted by clients worldwide for delivering high-quality solutions. • Recognised as a Top Rated Freelancer for years. Senior Mobile Engineer with 15 years of experience delivering enterprise and consumer mobile applications across life sciences, fintech, travel and media. Led architecture, modernisation and delivery of production apps, including one serving 100K+ enterprise users, with expertise in Swift, SwiftUI, UIKit, Swift Concurrency and Clean Architecture, and working proficiency in native Android development using Kotlin and Jetpack Compose. Primary iOS engineer over 10 years on a life-sciences enterprise product serving 100K+ users across major global pharmaceutical organisations in 15 languages, delivering 10–12 production releases a year while sustaining a stable, high-quality user experience. Built a large greenfield US fintech application from scratch as the lead iOS engineer, integrating Plaid, Atomic UserLink and Persona identity verification. Incrementally modernised legacy iOS applications by migrating from Objective-C to Swift, UIKit to SwiftUI and adopting Swift Concurrency, Clean Architecture, SOLID principles and modularisation without disrupting ongoing feature delivery — cutting technical debt and avoiding a multi-year rewrite of a revenue-generating enterprise product. Diagnosed and resolved production stability and performance issues — app launch time, main-thread hangs, memory footprint and leaks — through crash triage and Instruments profiling (Time Profiler, Allocations, Leaks) and SwiftUI view-body update reduction. Delivered secure mobile products under GDPR and US financial-services compliance requirements, implementing data minimisation, secure local storage and certificate pinning. Built offline data capture for field teams working without connectivity — encrypted local persistence and deferred submission — removing an adoption blocker on a global enterprise deployment. Core Technologies & Skills Programming & Frameworks: • Swift • SwiftUI • Combine • Objective-C • UIKit • AVFoundation • Kotlin • Jetpack Compose • Flutter • Dart Development Expertise: • Auto Layout & Adaptive Layout • Multithreading (Async/Await) • Core Data & SQLite • REST API Integration • Alamofire (AFNetworking) • SDWebImage & SwiftyJSON Source Control & Collaboration Tools: • GitHub • Bitbucket • SVN Project Management Tools: • Jira • Trello iOS App Development | Mobile App Developer | Android | Kotlin | Flutter | React Native | MVP Development | Hybrid App