Staff Backend Engineer – AI

ABOUT STREAM Stream (GetStream.io http://GetStream.io)'s SDKs and APIs enable devs to build activity feeds, chat, and voice/video, powering over a billion end users worldwide. Trusted by top brands like Strava, Nextdoor, Patreon, and eBay, we're on a mission to make real-time communication and social experiences seamless for developers and their users. We're also the makers of Vision Agents https://visionagents.ai/, the open-source Python framework for building low-latency voice and video AI agents: over 8k stars on GitHub, 35+ model integrations, and sub-500ms latency on our global edge network. ROLE OVERVIEW We're seeking a Staff AI Engineer to own model development on our AI team. You'll build, fine-tune, evaluate, and ship the models that run inside Stream's products, end-to-end, from dataset design through to production. As the technical owner, you will drive key decisions independently, shipping models that directly impact systems serving over a billion users. Location: Office in Amsterdam or Remote (Europe). Occasional travel for in-person collaboration and meetups is encouraged. Hybrid policy: applicants based in the Netherlands or relocating here, are expected to work in the office in Amsterdam 3 times per week. Exemptions apply to specific cases. WHAT WILL YOU WORK ON - Own the development, fine-tuning, and evaluation of in-house AI models from dataset design through to production deployment. - Run supervised fine-tuning and post-training experiments, establishing the benchmarks and evaluation harnesses that tell us whether a model is actually good enough to ship. - Build and maintain the data pipelines that feed model training, keeping data quality, labelling, and reproducibility to a high standard. - Take models to production on Stream's serving stack, tuning for latency, cost, and reliability at high volume. - Set the technical direction for an intentionally undefined problem space, deciding what to build, what to test, and what to abandon. - Work acros