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Alex Chen

Alex Chen

Senior iOS Engineer

Profile

Senior iOS Engineer with 7+ years of experience building performant, user-centric mobile applications. Expert in Swift, SwiftUI, and modern iOS architecture with a track record of leading teams and delivering production-grade apps.

Experience

Senior iOS Engineer

TechFlow Mobile

San Francisco, CA06/2021 - Present

Lead iOS development for the company's flagship consumer banking application serving 2 million monthly active users. Architected modular SwiftUI components and established CI/CD pipelines. Mentored a team of 4 engineers and defined coding standards for the mobile organization. Collaborated with product and design teams to deliver features on aggressive timelines.

Real-Time Investment Dashboard

  • Built a real-time investment tracking dashboard with live market data streaming, interactive charts, and portfolio analytics. Implemented WebSocket connections for sub-second latency updates and designed a local caching strategy for offline usability.
  • SwiftUI, Combine, WebSocket, Core Data, MVVM, Clean Architecture
  • Led architecture design, implemented real-time data layer, established testing protocols, and conducted code reviews for team contributions.
  • Tech Stack: SwiftUI Combine WebSocket Core Data MVVM Unit Testing CI/CD
  • Challenges: 50% Faster Load Times: Reduced initial dashboard load time by 50% through incremental data fetching and background prefetching strategies.
  • Challenges: 99.9% Crash-Free Rate: Achieved 99.9% crash-free sessions by implementing comprehensive error handling and automated regression testing.

AI-Assisted Customer Support Integration

  • Integrated Claude Code and GitHub Copilot into the iOS development workflow to accelerate feature delivery and improve code quality. Implemented an AI-assisted support chatbot with schema-constrained structured outputs, tool calling for account actions, and human review flows for sensitive operations.
  • SwiftUI, REST API, JSON Schema, Claude Code, GitHub Copilot, Feature Flags
  • Designed chatbot UX with streaming responses and tool-state interfaces, established human-supervised AI workflow with task decomposition and PR review processes, and implemented tracing for model performance monitoring.
  • Tech Stack: SwiftUI REST API JSON Schema Feature Flags Observability
  • Challenges: 30% Faster Feature Delivery: Reduced average feature development time by 30% through AI-assisted code generation, test generation, and documentation updates with mandatory local validation and code review.
  • Challenges: Human-in-the-Loop Safety: Designed interruption/retry mechanisms and citation displays for AI-generated responses, ensuring compliance with financial regulations and maintaining user trust.

Junior iOS Developer

AppNova Studios

Palo Alto, CA08/2018 - 05/2021

Developed features for a social media content creation app with 500,000 downloads. Implemented camera filters, video editing tools, and social sharing capabilities. Participated in agile ceremonies and collaborated with designers to implement pixel-perfect UIs.

Video Editing Suite

  • Built a native video editing suite with trim, merge, filter, and text overlay capabilities. Integrated GPU-accelerated rendering with Metal for real-time preview performance.
  • UIKit, AVFoundation, Metal, Core Image, MVC
  • Implemented video processing pipeline, optimized memory usage for large video files, and resolved performance bottlenecks on older devices.
  • Tech Stack: UIKit AVFoundation Metal Core Image MVC
  • Challenges: 4K Video Support: Enabled 4K video editing on iPhone 8 and newer by implementing chunked processing and background rendering queues.

Skills

Core iOS Development

  • Expert-level Swift programming with deep knowledge of memory management, concurrency (GCD, OperationQueues, async/await), and the iOS SDK
  • Proficient in both UIKit and SwiftUI, with extensive experience building custom UI components, animations, and responsive layouts
  • Strong understanding of the iOS lifecycle, background execution models, and app sandboxing

Mobile Architecture & Patterns

  • Design and implementation of scalable architectures including MVVM, VIPER, and Clean Architecture
  • Experienced in modularization with Swift Package Manager and dynamic feature delivery
  • Skilled in dependency injection, protocol-oriented programming, and reactive programming with Combine and RxSwift

Data & Networking

  • Implementation of robust networking layers with URLSession, Alamofire, and GraphQL
  • Expertise in local persistence with Core Data, Realm, and SQLite
  • Experience with data synchronization strategies, conflict resolution, and offline-first architectures
  • Proficient in secure data handling with Keychain and encryption standards

Performance & Quality

  • Profiling and optimization using Instruments, Xcode Memory Graph, and MetricKit
  • Experience with app thinning, binary size optimization, and startup time reduction
  • Comprehensive testing strategies including XCTest, XCUITest, snapshot testing, and automated regression pipelines with Fastlane and GitHub Actions

AI-Assisted Software Delivery

  • Integration of AI-assisted development tools including Claude Code and GitHub Copilot into production iOS workflows
  • Established human-supervised pipelines for task decomposition, repository-context exploration, implementation planning, test generation, PR review, debugging, and documentation updates
  • All generated changes require local validation, CI checks, code review, security/permission review, and rollback readiness
  • Designed streaming UX with tool-state interfaces, citations, and interruption/retry flows for AI-native features
  • Implemented observability with tracing and model versioning for quality assurance

Education

B.S. in Electrical Engineering and Computer Sciences

University of California, Berkeley

Berkeley, CA09/2014 - 05/2018
Relevant coursework: Data Structures and Algorithms, Operating Systems, Mobile Application Development, Computer Networks, Software Engineering. Graduated with Honors. Senior capstone project: Developed a peer-to-peer file sharing application with end-to-end encryption. Active member of the Mobile Development Club, mentoring new students in iOS development.