Aayush Raghuvanshi, Developer in Sunnyvale, CA, United States
Aayush is available for hire
Hire Aayush

Aayush Raghuvanshi

iOS Developer

Sunnyvale, CA, United States

Toptal member since January 30, 2026

Expertise
Apple Pay DevelopmentJavaScriptSwiftJiraGitTwilio DevelopmentOAuthFlutteriOSMacOSXcodeJenkinsGraphQLObjective-CREST API
Bio

Aayush is an iOS developer with proven experience designing modular, scalable, and secure iOS applications. His work focuses on implementing VIPER architecture with Swift and MVVM to enhance code maintainability and performance across banking services. By leveraging SwiftUI, UIKit, and adaptive layouts, he aims to create visually appealing and seamless user interfaces for iOS, iPadOS, and WatchOS platforms.

Portfolio

Walmart
Swift, SwiftUI, UIKit, VIPER Architecture, Model View ViewModel (MVVM), Combine...
HSBC
Swift, SwiftUI, UIKit, Model View ViewModel (MVVM), Combine, Core ML
Etsy
Swift, SwiftUI, Model View ViewModel (MVVM), Clean Architecture, POP, Combine...

Experience

  • Computer Science - 12 years
  • JavaScript - 9 years
  • macOS, Xcode, Swift, SwiftUI, Combine, Instruments, Git, Fastlane, Jenkins, Jira, Figma, Postman - 9 years
  • Swift, Objective-C, MVVM, Core Data, OAuth 2.0, Face ID, Touch ID, APNs, RESTful APIs, Alamofire, SSL Pinning, Secure Enclave, XCTest, Git, Jenkins, AFNetworking, SDWebImage, VoiceOver, Dynamic Type, Haptic Feedback, React Native - 9 years
  • Swift, Objective-C, UIKit, Core Data, UICollectionView, REST APIs, AFNetworking, OAuth, Keychain Services, Auto Layout, SDWebImage, NSOperations, NSJSONSerialization, XCTest, XCUITest, Google Analytics, JIRA, Agile Scrum. - 9 years
  • Twilio API - 6 years
  • Figma - 6 years
  • APNs - 6 years

Preferred Environment

MacOS, Xcode, Swift, SwiftUI, Combine, Instruments, Git, Fastlane, Jenkins, Jira

The most amazing...

...thing I've developed is a high-performance Subreddit feed for Reddit.

Work Experience

Senior iOS Engineer

2025 - PRESENT
Walmart
  • Developed a high-performance Subreddit feed for Reddit using UICollectionView with optimized preloading, which reduced memory consumption and load times by 25%.
  • Leveraged MacOS, Xcode, Swift, SwiftUI, Combine, Instruments, Git, Fastlane, Jenkins, Jira, Figma, and Postman.
  • Implemented mobile security by integrating SSL pinning, biometric authentication, and secure enclave protocols to protect sensitive financial and patient data across multiple high-traffic platforms.
Technologies: Swift, SwiftUI, UIKit, VIPER Architecture, Model View ViewModel (MVVM), Combine, Core ML, Sirikit, GraphQL, Codable, Core Data, Keychain, OAuth 2, UICollectionView, Xcode, Fastlane

Lead iOS Developer

2022 - 2025
HSBC
  • Worked on secure native iOS features for Walmart's Vision and Health app, managing the complete lifecycle and reducing iterative rework by 30% through early requirement clarification.
  • Leveraged a robust VIPER architecture for HSBC's mobile banking platform, achieving 95% code coverage while ensuring modularity across critical fund transfer and transaction history services.
  • Improved application performance for Reddit by diagnosing complex bottlenecks with Instruments, resulting in a 25% reduction in load times and significantly smoother UI scrolling.
Technologies: Swift, SwiftUI, UIKit, Model View ViewModel (MVVM), Combine, Core ML

Mobile Developer

2021 - 2022
Etsy
  • Developed a high-performance, AI-driven search engine for Etsy's global marketplace using GraphQL and TensorFlow Lite, which enabled real-time product discovery for millions of users.
  • Refactored the Etsy application from MVVM to a layered clean architecture using protocol-style abstractions in Dart, significantly improving modularity and testability.
  • Designed an in-app search engine with GraphQL and optimized API calls through query batching and pagination, achieving real-time product discovery and filtering.
Technologies: Swift, SwiftUI, Model View ViewModel (MVVM), Clean Architecture, POP, Combine, GraphQL, Alamofire

Senior iOS Developer

2020 - 2021
Hawaiian Airlines
  • Developed the integrated flight booking and check-in system for Hawaiian Airlines, which utilized Apple's PassKit to deliver digital boarding passes directly to users' wallets for a seamless travel experience.
  • Architected and developed the flight booking screen using UIKit, creating an intuitive and high-performance reservation interface that streamlined the ticket purchase process.
  • Integrated the PassKit framework to generate and deliver digital boarding passes directly to the Apple Wallet, enhancing the paperless travel experience for passengers.
Technologies: XCUITest, Bitrise, OAuth 2, Git, Figma, XCTest, Jira, Swift, SwiftUI, Model View ViewModel (MVVM), Alamofire, APNs, UIKit, RESTFul APIs, Crashlytics, Core Data, Apple Pay, Twilio API, PassKit

Mobile Engineer

2018 - 2020
Tenet Healthcare
  • Developed a secure healthcare portal for Tenet Diagnostics that integrated HealthKit and biometric authentication, ensuring patients could safely access lab results and schedule appointments with a single tap.
  • Implemented secure patient authentication flows by integrating OAuth 2, Apple Face ID, and Touch ID, leveraging the secure enclave protocol to safeguard sensitive health data.
  • Engineered a custom native bridge in Swift to expose HealthKit and biometric APIs to React Native layers, achieving feature parity across cross-platform modules.
Technologies: Swift, Objective-C, Model View ViewModel (MVVM), Core Data, OAuth 2, Apple Face ID, Touch ID, APNs, RESTFul APIs, HealthKit

iOS Software Developer

2016 - 2018
Polaris
  • Developed an interactive maintenance and telemetry system for Polaris off-road vehicles that used Core Bluetooth to pull real-time machine statistics directly into the mobile app for a smarter riding experience.
  • Engineered a dynamic product catalog screen using UICollectionView and Auto Layout, enabling users to browse vehicle models, technical specifications, and pricing through a high-performance UI.
  • Implemented real-time hardware communication features using Core Bluetooth to retrieve live vehicle statistics and diagnostic data directly from Polaris machines.
Technologies: Swift, Objective-C, UIKit, Core Data, UICollectionView, REST APIs, AFNetworking

iOS Engineer

2014 - 2016
Reddit, Inc.
  • Developed is a high-performance Subreddit feed for Reddit using UICollectionView with optimized preloading and Instruments-driven performance tuning, which reduced memory consumption and load times by 25%.
  • Integrated GraphQL APIs with the Apollo Client SDK to enhance search capabilities for posts and Subreddits.
  • Leveraged the URLSession API for efficient data handling.
Technologies: Swift, Objective-C, UIKit, UICollectionView, WebSockets, GraphQL, Apollo Client

Experience

Walmart Vision iPad App

As part of Walmart Global Tech, I worked on the Walmart Vision iPad application used by Vision Center associates across thousands of Walmart and Sam's Club locations. One of my key contributions was translating complex wireframes and UX specifications into pixel-perfect, production-ready UIKit interfaces aligned with Walmart's WCP design system. The app supports high-volume optical workflows, so accuracy, clarity, and performance were critical.

I was heavily involved in implementing and refining multiple user journeys, including patient onboarding, prescription entry, insurance and benefits flows, order creation, and checkout experiences. This included building dynamic forms, validation logic, reusable UI components, and smooth navigation using MVVM with the Coordinator pattern. A major focus area was the insurance and benefits experience, where I implemented insurance lookup, coverage visibility, and a benefits verification UI, ensuring associates could quickly understand eligibility and pricing without friction during in-store interactions.

Education

2013 - 2014

Master's Degree in Computer Science

Boston University - Boston, MA, USA

2005 - 2009

Bachelor's Degree in Computer Science

Boston University - Boston, MA, USA

Skills

Libraries/APIs

Twilio API, Alamofire, Codable, HealthKit, REST APIs, Apollo Client

Tools

Jira, Figma, Git, Crashlytics, Xcode, Instruments, Fastlane, Jenkins, Sirikit

Languages

Swift, JavaScript, GraphQL, Objective-C

Frameworks

XCUITest, XCTest, OAuth 2, Core Data, SwiftUI, UIKit, Flutter, Combine, Core ML, PassKit, AFNetworking

Paradigms

Model View ViewModel (MVVM), VIPER Architecture, Clean Architecture

Platforms

Bitrise, iOS, MacOS, Keychain

Other

Computer Science, Swift, SwiftUI, SwiftData, UIKit, VIPER, MVVM, Combine Framework, Core ML, Create ML, SiriKit, GraphQL, Async/Await, Codable, Core Data, Secure Enclave, Keychain Services, OAuth 2.0, Passkeys, SSL Pinning, ATS, Metal, RealityKit, CoreLocat, Swift, SwiftUI, SwiftData, UIKit, VIPER, MVVM, Combine Framework, Core ML, Create ML, SiriKit, GraphQL, Async/Await, Codable, Core Data, Secure Enclave, Keychain Services, OAuth 2.0, Passkeys, SSL Pinning, ATS, Metal, RealityKit, CoreLocation, MapKit, APNs, Widgets, TestFlight, Xcode Cloud, Jenkins, GitHub Actions, Fastlane, Adobe Analytics, TipKit, CarPlay, Accessibility APIs, Swift, SwiftUI, UIKit, MVVM, Clean Architecture, POP, Combine, GraphQL, Alamofire, Core ML, Create ML, Secure Enclave, Apple Pay, Stripe API, CoreLocation, Core Data, SSL Pinning, CommonCrypto, APNs, Firebase Analytics, XCTest, XCUITest, Fastlane, GitLab CI, Agile, Jira, Flutter, Swift, Objective-C, MVVM, Core Data, OAuth 2.0, Face ID, Touch ID, APNs, RESTful APIs, Alamofire, SSL Pinning, Secure Enclave, XCTest, Git, Jenkins, AFNetworking, SDWebImage, VoiceOver, Dynamic Type, Haptic Feedback, React Native, Swift, Objective-C, UIKit, Core Data, UICollectionView, REST APIs, AFNetworking, OAuth, Keychain Services, Auto Layout, SDWebImage, NSOperations, NSJSONSerialization, XCTest, XCUITest, Google Analytics, JIRA, Agile Scrum., Swift, Objective-C, UIKit, UICollectionView, WebSockets, GraphQL, Apollo Client SDK, URLSession, OAuth 2.0, CommonCrypto, Instruments Profiler, XCTest, XCUITest, Fastlane, Jenkins, Firebase Analytics, SnapKit, Alamofire, Agile Scrum., Apple Pay, APNs, RESTFul APIs, macOS, Xcode, Swift, SwiftUI, Combine, Instruments, Git, Fastlane, Jenkins, Jira, Figma, Postman, UICollectionView, POP, Apple Face ID, Touch ID, WebSockets

Collaboration That Works

How to Work with Toptal

Toptal matches you directly with global industry experts from our network in hours—not weeks or months.

1

Share your needs

Discuss your requirements and refine your scope in a call with a Toptal domain expert.
2

Choose your talent

Get a short list of expertly matched talent within 24 hours to review, interview, and choose from.
3

Start your risk-free talent trial

Work with your chosen talent on a trial basis for up to two weeks. Pay only if you decide to hire them.

Top talent is in high demand.

Start hiring