Principal Engineer, iOS Performance

Reddit; United States; Remote; USD 233,000 - 326,000; Full time

Benefits offered by this job

Healthcare benefits

401k with employer match

Global benefits programs

Family planning support

Gender-affirming care

Mental health & coaching benefits

Flexible vacation & paid volunteer

Parental leave

Job summary

Reddit is seeking a Principal Engineer to own and scale the iOS platform architecture for the Reddit mobile app, targeting 100M+ daily active users. You will mentor engineers, set standards, and drive performance-focused development across the team.

You will lead redesigns, improve modularity and observability, and partner with design, product, and data teams to deliver high-quality user experiences globally. This role emphasizes strategic thinking and long-term technical foundations.

Qualifications

• 10+ years of software development experience with at least 5+ years in designing and developing iOS applications.
• Experience influencing large organizations on iOS technical direction and best practices.

Responsibilities

• Own the architecture of Reddit’s iOS Mobile App and scale to 100M+ DAUs.
• Lead redesign to improve modularity, performance, and quality of the iOS platform.
• Define and drive key performance goals (ANR, launch time, smooth frames).
• Improve observability and data quality with telemetry, monitoring, and guardrails.
• Mentor iOS engineers and serve as a go-to for complex iOS architecture problems.

Skills

iOS development

SwiftUI

Structured Concurrency

Mentoring

Cross-functional collaboration

Education

Bachelor's degree in Computer Science or related field

Tools

SwiftUI

Structured Concurrency

Job description

Reddit is a community of communities. It’s built on shared interests, passion, and trust, and is home to the most open and authentic conversations on the internet. Every day, Reddit users submit, vote, and comment on the topics they care most about. With 100,000+ active communities and approximately 130 million daily active unique visitors, Reddit is one of the internet’s largest sources of information. For more information, visit www.redditinc.com . The iOS Platform team sets the technical direction for iOS at Reddit. Our customers are primarily other engineers. It’s our job to help improve developer efficiency by providing libraries/APIs/frameworks, monitoring performance, building shared components, improving build tools, etc. In the codebase, we own the core components of the app such as the networking and caching stack. We set the direction in which the codebase builds by defining which design patterns and technologies to employ at Reddit. This role will enable us to architect our iOS app to scale for the next 100M+ DAUs. They will help establish the right standards in iOS development and will help in improving the overall iOS development experience at Reddit. In addition, they will mentor senior iOS engineers across Reddit and will be seen as a go-to person for any challenges on iOS App architecture. As a Principal Engineer in the iOS Platform team, you will be responsible for designing a solid foundation for our iOS application development.

What you’ll do

• 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 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

• 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

# LI -Remote Pay Transparency: This job posting may span more than one career level. In addition to base salary, this job is eligible to receive equity in the form of restricted stock units, and depending on the position offered, it may also be eligible to receive a commission. Additionally, Reddit offers a wide range of benefits to U.S.-based employees, including medical, dental, and vision insurance, 401(k) program with employer match, generous time off for vacation, and parental leave. To learn more, please visit https://www.redditinc.com/careers/ .

The base salary range for this position is: $232,500 — $325,500 USD

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Reddit is proud to be an equal opportunity employer, and is committed to building a workforce representative of the diverse communities we serve. Reddit is committed to providing reasonable accommodations for qualified individuals with disabilities and disabled veterans in our job application procedures. If, due to a disability, you need an accommodation during the interview process, please let your recruiter know.