Cast AI seeks a Senior Data Scientist with 5+ years of hands-on experience to design and productionize machine learning models (tabular and time-series), run experiments, build data pipelines, and perform deep-dive analyses. Requires advanced SQL and OLAP knowledge; experience with cloud platforms (AWS/GCP/Azure), Kubernetes, MLOps tools (MLflow, Feast), and OLAP systems (Clickhouse, BigQuery, Snowflake) is a plus. Remote-first role covering specified countries; salary range €6,500–€9,000 gross.

Work on inference and serving infrastructure to improve throughput, latency, and KV cache utilization across GPUs and distributed topologies. Responsibilities include kernel-level tuning, quantization without quality regression, profiling and benchmarking, batching and speculative decoding, memory and cold-start optimizations, and setting technical direction. Technology stack includes Python, vLLM, SGLang, TensorRT-LLM, PyTorch, CUDA, Kubernetes and observability/tooling such as Prometheus, Grafana, ClickHouse and GitLab CI.