Principal Engineer, iOS Performance

Reddit, Inc.

Lead iOS architecture and performance for Reddit’s mobile app. Mentoring developers and establishing standards for robust app development.

Posted 5/4/2026full-timeRemote • 🇺🇸 United StatesLead💰 $232,500 - $325,500 per yearWebsite

Tech Stack

Tools & technologies

iOSSwift

About the role

Key responsibilities & impact

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.

Requirements

What you’ll need

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 people’s lives globally.
Experience working with cross-functional teams such as design, product, data teams to deliver great user experiences.
Bachelor's degree or higher in Computer Science or a related field, or equivalent technical expertise

Benefits

Comp & perks

Comprehensive Healthcare Benefits and Income Replacement Programs
401k with Employer Match
Global Benefit programs that fit your lifestyle, from workspace to professional development to caregiving support
Family Planning Support
Gender-Affirming Care
Mental Health & Coaching Benefits
Flexible Vacation & Paid Volunteer Time Off
Generous Paid Parental Leave

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

iOS developmentSwift UIstructured Concurrencymobile application architectureperformance optimizationtelemetrymonitoringmodularityuser-facing performance goalsApp Not Responding (ANR) rate

Soft Skills

strategic thinkingmentoringcross-functional collaborationleadershipproblem-solvingcommunicationinfluencingpassion for software developmentculture of performancelong-term vision

Certifications

Bachelor's degree in Computer Science