Staff Software Engineer, Community Builders

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 126 million daily active unique visitors, Reddit is one of the internet’s largest sources of information. com . The Community Builders organization exists to empower anyone, anywhere, to create and steer a thriving community.

We do that by making community building intuitive, sustainable, and rewarding. That mission sits at the heart of Reddit's long-term health as a platform: a Reddit with more thriving communities is a better Reddit for everyone, and our job is to make sure the path to "thriving" is one any passionate person can actually walk. The Engagement team is where we cultivate Reddit's community growth.

We help new communities find their audience and build the kind of momentum that keeps them engaged long after the first few posts. We aim to connect users with content and conversations to which they want to contribute, no matter how niche the topic. Our north star is thriving communities .

These are places where moderators are engaged, members keep returning, and content compounds on itself. Getting communities there requires a content flywheel that surfaces the right guidance and tools at the right moment to speed up organic engagement. We use data, ML-powered signals, and product experimentation to identify and remove every barrier standing between a community and sustainable, self-reinforcing growth.

This is a Growth team. We move with urgency, instrument everything, and treat a missed activation milestone as a signal to learn from, not a number to ignore. If you want to build systems that measurably change the trajectory of tens of thousands of communities, and improve the health of Reddit itself, this is your team.

What You'Ll Do

: Foster and Guide the Technical Strategy for Growth Define and accelerate the backend architecture powering the team's core growth levers: the systems that get new communities in front of the right people across feeds, search, and onboarding surfaces, and the infrastructure that drives member participation to build sustained content momentum. You won't just be following a roadmap; you'll shape how we build these systems from the ground up. 🤝Partner With the EM to Cultivate a Growth Engineering Mindset Growth teams operate differently than platform teams.

We prioritize experimentation and iteration, which means sometimes we throw things away to move faster. You'll help the team internalize that operating model: what it means to build for learning, how to balance velocity with reliability, and how to stay rigorous when moving fast. 🤖Scale Impact Through Collaborative Engineering Just as thriving communities don't succeed in isolation, neither does this team.

You'll build and maintain deep partnerships with the engineering teams whose surfaces directly shape community growth: Relevance, Feeds, Search, and beyond. Many of these collaborations will touch ML-powered systems that surface the right communities to the right users. You'll be the bridge that ensures Community Builders has a technical representation for the team and a collaborative influence on their roadmaps.

📊Instrument, Measure, and Iterate Establish the instrumentation and experimentation foundations that let the team run rigorous A/B tests on growth levers. Translate data from activation funnels, retention curves, and content engagement into architectural choices. Use metrics to make the case for the bets worth taking, and deprioritize efforts that don't meet goals.

🔗Guide Cross-Functional Alignment Serve as the engineering voice in XFN partnerships with Product, Design, Data Science, and other Consumer platform teams.