Mid/Senior AI LLM Engineer (Full Remote - Europe)
Core
Fine-tune and post-train open-weight LLMs to power a consumer-scale AI companionship platform for 50M+ users, focusing on model behavior, personalization, and consistency.
Role type
Senior IC LLM Engineer (Post-training & Fine-tuning)
Builds
Production-ready fine-tuned open-weight models for an AI companionship product
Domain
Consumer AI / Large Language Models
Deliverable
production ML models
Required skills
Fine-tuning open-weight LLMs, SFT, LoRA/QLoRA, DPO, GRPO, Python, PyTorch, Hugging Face, GPU training/debugging, building training data and evals
Preferred skills
Conversational AI/roleplay experience, multilingual LLMs, moderation/safety testing, multimodal models, open-source contributions
Technologies
PyTorch, Hugging Face, LoRA, QLoRA, DPO, GRPO
Responsibilities
Fine-tune models using SFT, LoRA/QLoRA, and post-training methods; diagnose model failures and design experiments; build training data and evals; improve model behavior for personalization and consistency; ship models to production; optimize training loops for speed and reproducibility
Seniority
Senior, hands-on IC
