AI Research Engineer - PostHog

About PostHog

PostHog is the only platform that acts as a co-pilot for product development, allowing teams to analyze, diagnose, and roll out changes autonomously. We are product-led, default alive, and well-funded, with over 450,000 organizations using our tools.

The Role

We are building a new AI Research team to leverage our massive datasets—including events, errors, and session replays—to create self-driving product features. As an AI Research Engineer, you will have high autonomy to influence our product roadmap and ship production-ready AI solutions.

What You'll Be Doing

• Session Replay Analysis: Scaling issue detection using deep learning and DOM mutation data.
• User Behavior Prediction: Automating drop-off identification and conversion optimization.
• Synthetic User Testing: Developing simulations to catch bugs and confusing flows before release.

Requirements

• Strong background in math (PhD is a plus).
• Proven experience training models.
• Proficiency in PyTorch.
• Strong coding skills in Rust (preferred), CUDA, or C.
• Solid understanding of Transformers.
• A product-focused mindset; you are expected to build and ship, not just research.

Our Culture

• Transparency: We share our roadmap, strategy, and financials internally.
• Autonomy: Engineers lead product teams and make their own decisions.
• Shipping Fast: We prioritize async communication and heads-down building time.
• Being Weird: We value unconventional approaches and building unique tools.

Note: This is a hybrid-remote position based out of our London office.