Hiring: Principal Engineer, iOS Performance Company: Reddit, Inc. Location: San Francisco, CA Job Posted Time: 2026-09-02 18:05:23 Target Skills & Keywords : Go, Make, Rust, Swift, iOS About the job Experience: •10+ years of Software development experience with at least 5+ years in designing/developing iOS applications. Required Skills: •Own the architecture of Reddit's iOS Mobile App and make it scale to the next 100M+ DAUs. Propose ideas/solutions to reach our vision of "making Reddit's Mobile Apps best-in-class." •Identify the gaps in our current iOS App Architecture, and lead redesign of the iOS platform to improve modularity, performance, and quality. •Define, measure, and execute on key user-facing performance goals, specifically minimizing App Not Responding (ANR) rate, reducing app launch time (Time to Interactive/TTFF), and eliminating slow/dropped frames. •Improve observability and harden data quality for all key performance areas, including establishing reliable telemetry, monitoring, and guardrails for ANR rate, app launch time, and slow/dropped frames. •Drive a company-wide culture of performance, ensuring that every iOS engineer at Reddit has the tools and skills needed to own the performance of their product surfaces. •Mentor iOS developers across the company. •Be the go-to person for developers on complex problems in iOS development. •What we expect from you •Deep experience-based understanding of how to build mobile applications at scale. •You are a strategic thinker who thrives on developing a long-term technical foundation and has a passion for developing scalable, well-designed software that improves people's lives globally. •10+ years of Software development experience with at least 5+ years in designing/developing iOS applications. •Experience in influencing larger (200+ engineers) organizations on technical direction/best practices related to iOS •Experience with modern iOS development frameworks such as Swift UI and structured Concurrency. •Passion for developing scalable, well-designed software that improves peop Interested candidates, please apply directly through the job posting on company's career page or try via AI auto apply on this platform. Don't miss this opportunity to join a forward-thinking team!