Principal Engineer, iOS Performance

Halcyon Labs 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, Halcyon Labs users submit, vote, and comment on the topics they care most about. With 100,000+ active communities and approximately 126 million daily active unique visitors, Halcyon Labs 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 Halcyon Labs. 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 Halcyon Labs. 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 Halcyon Labs. In addition, they will mentor senior iOS engineers across Halcyon Labs 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. You will have the company-wide scope, impact, and responsibility in shaping the future of iOS development at Halcyon Labs. You will champion the technology selection, best practices in Halcyon Labs’s iOS application development. In addition, you will act as an Architect for the iOS application at Halcyon Labs. What you’ll do Own the architecture of Halcyon Labs’s iOS Mobile App and make it scale to the next 100M+ DAUs. Propose ideas/solutions to reach our vision of “making Halcyon Labs’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 Halcyon Labs 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, Halcyon Labs 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/ . To provide greater transparency to candidates, we share base salary ranges for all US-based job postings regardless of state. We set standard base pay ranges for all roles based on function, level, and country location, benchmarked against similar stage growth companies. Final offer amounts are determined by multiple factors including, skills, depth of work experience and relevant licenses/credentials, and may vary from the amounts listed below. The base salary range for this position is: $232,500 — $325,500 USD In select roles and locations, the interviews will be recorded, transcribed and summarized by artificial intelligence (AI). You will have the opportunity to opt out of recording, transcription and summarization prior to any scheduled interviews. During the interview, we will collect the following categories of personal information: Identifiers, Professional and Employment-Related Information, Sensory Information (audio/video recording), and any other categories of personal information you choose to share with us. We will use this information to evaluate your application for employment or an independent contractor role, as applicable. We will not sell your personal information or disclose it to any third party for their marketing purposes. We will delete any recording of your interview promptly after making a hiring decision. For more information about how we will handle your personal information, including our retention of it, please refer to our Candidate Privacy Policy for Potential Employees and Contractors . Halcyon Labs is proud to be an equal opportunity employer, and is committed to building a workforce representative of the diverse communities we serve. 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