iOS Developer - SwiftUI, MVVM, GraphQL

Piyush Pujari

+1-551-***-**** www.linkedin.com/in/piyushiosdev **********.***.***@*****.*** Santa Clara, CA

Professional Summary

iOS Developer with 6+ years of experience delivering fast, stable, enterprise-grade apps across retail, healthcare, fitness,

and finance. Strong in SwiftUI, UIKit, Combine, Core Data, GraphQL, REST, and advanced multithreading and memory

management. Skilled at building scalable architectures with MVC, MVVM, and Coordinators, integrating complex APIs,

and shipping polished, user-focused features. Experienced with CI/CD (Jenkins, Git), automated testing (XCTest,

XCUITest, Appium), and performance tuning with Instruments. Consistently delivers accessible, localized, secure mobile

solutions while leading features, mentoring teams, and boosting app stability, engagement, and business impact.

Professional Experience

Quest Diagnostics - iOS Developer Santa Clara, CA May 2024 – Present

• Architected and delivered a driver application supporting specimen pickup, route optimization, and healthcare

logistics across multiple facilities.

• Developed scalable features using Swift, SwiftUI, MVVM, Combine, GCD, and async/await, improving code

maintainability and responsiveness.

• Integrated RESTful APIs with robust networking, error handling, retry mechanisms, and offline data

synchronization.

• Implemented Core Location, MapKit, Geofencing, and background location updates to improve route accuracy

and driver efficiency.

• Optimized application performance by identifying memory leaks, retain cycles, excessive allocations, and UI

bottlenecks using Instruments.

• Improved application startup time and scrolling performance through lazy loading, caching strategies, and optimized

rendering.

• Collaborated with backend engineers, QA, product managers, and business stakeholders using Agile methodologies to

deliver production-ready features.

• Wrote unit tests using XCTest and participated in code reviews, ensuring maintainable and high-quality code.

• Managed source control using Git, pull requests, and CI/CD pipelines to support continuous delivery.

• Ensured compliance with healthcare security requirements while handling sensitive patient information.

Nike - iOS Developer Jun 2021 – Jun 2023

• Developed and enhanced customer-facing features for the Nike shopping application, including Cart, Checkout,

Promotions, and Order Management.

• Built reusable UI components using UIKit, improving consistency, and reducing development effort across multiple

modules.

• Worked extensively with MVVM, Coordinator architecture, and combine to build modular, testable, and

maintainable applications.

• Integrated internal SDKs and third-party frameworks using Swift Package Manager and Cocoa Pods.

• Optimized networking, image loading, and application startup, resulting in improved user experience.

• Reduced production crashes by resolving memory leaks, race conditions, threading issues, and performance

bottlenecks.

• Consumed REST APIs and implemented efficient JSON parsing, caching, and background synchronization.

• Collaborated closely with designers, QA, backend engineers, and product teams throughout the Agile development

lifecycle.

• Participated in architecture discussions, code reviews, mentoring junior developers, and enforcing coding standards.

• Supported App Store releases, feature flags, phased rollouts, and production issue monitoring.

HCA Healthcare - iOS Developer Jan 2019 – May 2021

• Developed patient-facing healthcare applications supporting appointments, billing, prescriptions, laboratory reports,

and medical records.

• Built secure authentication flows and implemented HIPAA-compliant features for sensitive healthcare data.

• Integrated REST APIs to retrieve and synchronize patient information securely.

• Improved application responsiveness by optimizing database operations, API calls, and UI rendering.

• Collaborated with clinicians, business analysts, QA, and backend engineers to deliver healthcare solutions.

• Implemented reusable UI components and followed MVC/MVVM architectural patterns.

• Fixed production issues, improved application stability, and optimized memory usage using Instruments.

• Participated in sprint planning, estimation, code reviews, and production deployments.

Technical Skills

Languages: Swift, Objective-C, Java, Python, SQL

Frameworks & APIs: SwiftUI, UIKit, Auto Layout, Core Data, Combine, MapKit, WebKit, RESTful APIs, GraphQL

Testing & CI/CD: XCTest, XCUITest, Appium, Jenkins, Git

Tools & Other Skills: Xcode, Figma, JIRA, Network Inspectors, Accessibility (ADA), Localization, CocoaPods, Swift

Package Manager, Claude AI (Code Generation, Debugging & Development Assistance)

Education

Bachelor of Science in Computer Science 2019

Mumbai University Maharashtra, India

Master's in Computer Information Systems 2025

New England College Henniker, NH

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