凯峰 孙
@0001340
I am a Staff iOS engineer specializing in system architecture and real-time interactive applications.
ChinaWhat I'm looking for
I am a Staff iOS Engineer focused on system and application architecture, real-time interactive systems, and cross-platform SDK development. I build large-scale iOS/macOS applications from the ground up using Clean Architecture, SOLID, MVVM, TCA, SwiftUI, Combine, and RxSwift.
At Fanatics and Agora I led design of interactive live streaming and low-latency RTC systems, drove migrations to TCA, and implemented CI/CD and performance strategies that significantly improved stability and user experience. I combine product ownership and technical leadership to deliver high-concurrency, production-grade features while mentoring teams and promoting strong engineering practices.
Experience
Work history, roles, and key accomplishments
FALed iOS technical strategy and implementation for Fanatics Live and Collect, evolving Live from consumption-only to an interactive low-latency streaming ecosystem and designing a hybrid auction architecture that optimized server resource use. Drove migration to TCA/MVVM patterns and implemented real-time messaging and WebSocket systems for voting and auctions.
RICore engineer for iOS/macOS conferencing app (Rooms), designed ANR monitoring and real-time capture to accelerate stability fixes, achieving a 300% improvement in ANR issue resolution rate within two quarters. Architected and delivered real-time captions including API design and speech processing pipeline.
AGTech Lead - AgoraVideoCall
Agora
Aug 2019 - Jan 2022 (2 years 5 months)
Led iOS/macOS AgoraVideoCall product team, architected modular cross-platform frameworks and logging/analytics that reduced iOS crash rate from 0.3% to 0.04% and macOS from 0.6% to 0.03%, while improving user NPS by ~40%. Built cross-platform C++ SDKs and optimized real-time screen sharing and VoIP integrations.
Senior iOS Engineer
Shanghai Duoqu Technology Co., Ltd.
Sep 2018 - Aug 2019 (11 months)
Architected IM protocol and reactive MVVM+RxSwift app for a social platform with 250K+ DAU and 7M+ users, supporting one-to-one, group, chatroom and voice communication and robust offline message synchronization. Implemented Protobuf-based Socket protocol and optimized large-scale message processing.
BIVideo Player Engineer
Bilibili
May 2018 - Sep 2018 (4 months)
Worked in main site technical center focusing on video player performance optimization to improve playback UX and reduce latency and rendering issues. Implemented targeted fixes to enhance stability and user experience for large-scale video playback.
iOS Engineer
Shanghai Shanda Games
Jul 2017 - May 2018 (10 months)
Led 0-to-1 development of the social app 'Half Fish - Call Your Other Half' using RxSwift and MVVM, and built ChatService with Huanxin SDK including voice features and innovative UI like 3D planet and bullet comment views. Delivered core messaging and voice modules for social engagement.
iOS Engineer
Shanghai Xiangguo Network
Sep 2015 - May 2017 (1 year 8 months)
Developed a real-time synchronized whiteboard for interactive teaching using XMPP and Quartz2D, enabling live collaboration and synchronized drawing between teachers and students. Implemented performant rendering and network synchronization for educational interactions.
Education
Degrees, certifications, and relevant coursework
Shangqiu Normal University
Bachelor of Engineering, Communication Engineering
2011 - 2015
Bachelor of Engineering in Communication Engineering from Shangqiu Normal University, completed from September 2011 to June 2015.
Tech stack
Software and tools used professionally
Availability
Location
ChinaAuthorized to work in
Job categories
Skills
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