Principal Software Engineer, Ads

About The Position

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 116 million daily active unique visitors, Reddit is one of the internet’s largest sources of information. For more information, visit www.redditinc.com. Reddit is the home of conversation on the internet. Our Ads Engineering organization is responsible for the technology that fuels Reddit’s mission, connecting millions of users with brands through authentic, non-intrusive, and highly effective advertising experiences. We are seeking a Principal Software Engineer (L7) to serve as the technical anchor for our ads product engineering efforts. Reporting directly to the Senior Director of Engineering, you will span a diverse engineering portfolio that includes Ad Formats (the consumer-facing ad experience), Ads Manager (the advertiser-facing operational tool), Ads Safety (brand suitability and verification), and Solutions Engineering (business integrations). This is a product-oriented technical leadership role. You will not just be solving scale problems; you will be solving business problems through architecture. You will define how Reddit builds ads products for the next 3-5 years, ensuring we can iterate rapidly on new customer experiences while maintaining rigorous technical standards and a cohesive suite of offerings.

Requirements

A Product-Centric Technologist: You care deeply about the user experience (both redditors and advertisers). You evaluate technical trade-offs based on user value and business velocity, not just pure engineering elegance.
An Organizational Influencer: You have a proven track record of solving problems that require both code changes and people/process changes. You can influence VPs and Directors as effectively as you can code.
Ads Domain Expert: You understand the complexities of the ad tech ecosystem—auctions, attribution, privacy (ATT/SKAdNetwork), brand safety, and campaign management.
Force Multiplier: You have a history of making the teams around you significantly better, faster, and happier.

Responsibilities

Technical Strategy: Operate across the company, partnering with Consumer Product, Core Infrastructure, and Trust & Safety leadership to align technical roadmaps. You will identify company-level problems and drive solutions that benefit the entire engineering organization
Cross-Domain Architecture: Architect systems that span the entire Reddit stack.
Organizational Transformation: Identify bottlenecks in how our teams build software—whether technical (legacy debt, slow CI/CD) or organizational (siloed teams, unclear contracts)—and drive systemic changes to resolve them. You will solve hard technical and organizational problems.
Mentorship: Serve as a beacon of engineering excellence, specifically mentoring Staff (L6) and Senior (L5) engineers. You will help them navigate career growth, technical challenges, and influence, raising the bar for the entire ~100-person organization
Full-Stack Agnosticism: Whether your background is primarily Frontend or Backend, you will own the end-to-end technical solution. You will ensure that API designs enable performant UIs and that data models support future product flexibility.

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

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