Tech Lead, LLM & Generative AI (Full Remote - UK)

8+ years of engineering experience, with a significant portion dedicated to shipping ML/LLM features to millions of active users. Proficient in Python/PyTorch and comfortable with the modern LLM stack (vLLM, HuggingFace, fine-tuning pipelines, eval frameworks). Comfortable working with NSFW content and understanding the technical rigor required to moderate it effectively. Strong intuition for LLMs—how prompt conditioning, temperature, and sampling affect chatbot behavior. Value velocity and can distinguish between 'perfect' academic solutions and 'shippable' production solutions. Obsess over metrics, regressions, and user experience.

Act as a Player/Coach: Architect system and mentor team, spending significant time hands-on in codebase (Python/PyTorch). Own the core chat loop: Optimize context windows, memory/RAG retrieval, and inference latency. Drive strategy for SFT and RLHF/DPO. Manage the 'Data Engine': oversee sourcing, labeling, and cleaning of diverse datasets. Design and train custom classifiers to detect and filter non-consensual or illegal content.