Senior iOS Developer with 15+ Years Experience
Resume:
Choonghun Lee
***********@*****.***
Summary:
** ***** ** ****** *** development
Swift, SwiftUI, Objective-C, OOD, Combine, XCTest
Cocoa touch, UIKit, iOS SDK, NFC, BLE, GraphQL
MVC,MVVM, Design Pattern, SOLID
Core Data, Core Animation, Storyboard, AutoLayout
UI, JSON,XML, iOS UI Component
Work Authorization : GreenCard Holder
Professional Experience
iOS Freelancing for GateHouse, Nov,’25 - Current
* iOS project for Crypto DeFi (Liquidation Defense Copilot) app.
- Wallet connection, Firebase Messaging
- Data visualization for collateral ratio, Debt exposure..etc
- Business logic for Position Detail, Risk etc
- Heavy collaboration with backend
KDRP, iOS Dev, Nov,’24 - Nov, 25 (TX)
* Working on KDRP management app supporting product distribution, order processing Sales operation for large enterprise customer (major retail partner like Walmart)
- Maintaining of Order and distribution workflow with various IPad/IPhone app. Data-driven UI flow for tracking large-volume customer orders with real-time update Heavy volume of data handling.
- BLE Communication layer developments.
- Complex UI interface, restful api service, business logic. TD Bank, iOS Lead Dev, May,’22 - Oct, 24 (ME)
* Working on TD bank app - SwiftUI, UIKit, Combine / async-await, XCTest
- UIKit migration to SwiftUI
- Developed Bill Pay feature:
searchable payee list, scheduling calendar, payment history
- Developed Money Transfers feature:
validation account eligibility, realtime balance validation, error scenario
- Developed Paperless feature:
Enrollment flow, warning model, edge handling, document list & view
- Leading the team
Wells Fargo, iOS Lead Dev, July,’21 - May,’22 (CA)
* Working on framework on Wells Fargo app - SwiftUI, UIKit
- Developed SwiftUI Reusable Design System(Core Components Library) Components, Foundations, Layout, Feedback, Accessibility, Utility UIKit-Bridge
- Leading the team
Bank of America, iOS Dev, Mar,2019 - Mar,’21 (NJ)
* Working on Merrill Lynch app - Objective-C, Swift
- Dashboard re-architecturing and implementation
Scrollable independent multi service, multi thread supports
- Retirement Account feature
Portfolio views, balances, transactions history
High-performance data presentation layer
- iPad/iPhone single code base using size class.
- Developed offline tolerant flow
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Skava, iOS Lead, Jun,2015 - Jan,2019 (NYC)
* Architect, lead & delivery of the multiple e-commerce apps
- Swift, Objective-C
Project : Apple Atlas
* Apple internal iPad app for Apple Store in India
- Created the UI flow for various loan scenario
Developed step-based, state-driven navigation stack for long loan application flow Modeled complex load scenarios(varying tenures, interest structures, etc) Dynamic form and decision flow with UI
Project : LL Bean App
* Shopping app for LLBean.
- Implementation of product detail page, Shop Cart, Home Feed function. Goldman Sachs, iOS Dev, Aug’14 – Jan’15 (NJ)
* Working on enterprise finance app - Objective-C, Instrument
- Developed interaction layers between backend and local persistence with Core Data. Initial ingestion of large-scale financial data(~2GB) into Core Data and optimization Optimized Core Data stack for high-volume reads and writes Independent iOS Dev, Jan’14 – Jul’14 (NJ)
* Working on photo app
- PhotoApp image processing app on App Store
- Created the various gesturer recognizer for custom requirement
- UI Design, Restful service, IOS application development
- https://itunes.apple.com/us/app/gestures-camera/id825653391?mt=8 Samsung America, IOS Lead, Mar’13 – Jan’14 (TX)
* Working on 3D VR app
- Architect & lead of 3D VR iOS app
- 3D VR app on iOS Stereoscopic 3d rendering/game engine
- wrote the code with OpenGl rendering engine, shader code, C++
- native iOS app
Samsung Electronics, Tech Lead, Apr’06 – Jan,’13
* Working on 3D Graphics/Multimedia Core Application
- Architect & lead of the multimedia group
- 3G Graphic Engine /3D Game for iOS/Objective-c
- Custom 3D Graphics Shader Development tool
- multimedia streaming/voip,Sip.H.264
- C/C++, Objective-C,OpenGLES
- native iOS app
Samsung Electronics, Tech Lead, Apr’03– Apr,’06
* Working on 4G wireless system. C/C++
- Architect & lead of the group
- Seamless handover of WLAN
- Design and implementation of authentication during handover
• Wibro & voip security, authentication
• Voip protocol, security management design, implementation Fujitsu Network, Senior SW Dev, May,’00– Apr,’03 (NY)
* Working on Flash150 .(LANU,ATMU). C/C++
- Developed the network interface, protocol & application
- C/embedded system,TCP/IP
Motorola, Senior SW Dev, May’99 – Apr’00 (IL)
* Working on Next generation Base Station for iDen. C/C++
- SW Design the Network Fault Management subsystem.
- Design the FM subsystem according to the system requirements.
- C language /embedded system (MPC860,vxWorks)
Garnet system, SW Dev, Feb’94 – May’99. C/C++
* Working on Telecom Equipment SW development
- Developed MPC860 system design for optical ADM control unit.
- S/W development for telecom equipment from customer requirement
- C/assembler language /embedded system/TCP/IP (MPC860,vxWorks) Education B.S. in EE, ‘92 Kwangwoon university, Korea M.S. in EE, ‘94 Kwangwoon university, Korea
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