Senior Staff Backend Engineer, C3PO

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 97M+ daily active unique visitors, Reddit is one of the internet’s largest sources of information. For more information, visit redditinc.com.

We are looking for a highly experienced Sr Staff Backend Engineer to lead technical efforts across almost everything you see and touch on Reddit as a user - Feeds, Posting, Commenting, Media, Profiles, Reddit for Businesses and Publishers! This role requires deep expertise in building backend systems for social platforms, experience in crafting systems for machine learning life-cycle, at large scales. You’ll serve as the primary domain expert and technical leader, driving architecture, design, and implementation while collaborating with engineers, MLEs & PMs across multiple teams.

Problem Spaces You’ll Work In:

• Feeds, Media, Contribution Services, Profile services, Video Ranking, Comments Ranking: Power the core experiences of Reddit—what users see, touch, and interact with daily.
• AI Infrastructure: Building scalable systems for a small ML team to power their modelling lifecycle, supporting experimentation, production jobs, and AI-driven features like Video and Comment ranking.
• User and Business Tools: Helping Redditors and businesses thrive on the platform through seamless backend solutions.

In your day-to-day, you can expect to:

• Lead key technical and design decisions across all areas mentioned above.
• Lead teams to abstract monolithic systems into clean, isolated services to decouple product and infrastructure layers.
• Develop scalable infrastructure for the end-to-end machine learning lifecycle, from experimentation to production.
• Collaborate closely with Core ML teams to build/use embeddings to power consumer experiences, and optimize AI workloads.
• Drive alignment on product and technical strategy with cross-functional teams, including engineering, AI, and product.
• Maintain high standards of technical excellence while balancing business priorities.
• Partner with other technical leads and managers across engineering and AI teams to ensure seamless integration and execution.

Who you might be:

• BS degree in Computer Science, a similar technical field of study or equivalent practical experience
• 5+ years of technical leadership experience that includes both setting and delivering on long-term vision
• 10+ years of hands-on, professional software development experience …