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Tech Lead role to take helm of LLM team (currently 3 engineers) and own architecture, training, and deployment of models that power core AI companionship product. Building massive-scale conversational intelligence processing 80 million tokens per day. Role involves solving latency, throughput, and context management challenges at scale, with production focus where fine-tuned models impact millions of users immediately.
Job Responsibility:
Ship code and lead from the front as Player/Coach
Architect system and mentor team while spending significant time hands-on in codebase
Own core chat loop: optimize context windows, memory/RAG retrieval, and inference latency
Own model lifecycle: drive strategy for SFT and RLHF/DPO
Manage Data Engine: oversee sourcing, labeling, and cleaning of diverse datasets
Architect high-precision moderation: design and train custom classifiers to detect and filter non-consensual or illegal content
Requirements:
8+ years of engineering experience with significant portion dedicated to shipping ML/LLM features to millions of active users
Proficient in Python/PyTorch and comfortable with modern LLM stack (vLLM, HuggingFace, fine-tuning pipelines, eval frameworks)
Comfortable working with NSFW content and understanding technical rigor required to moderate it effectively without breaking user experience
Intuition for alignment: understanding how prompt conditioning, temperature, and sampling affect chatbot behavior
Doer mindset: ability to distinguish between perfect academic solution and shippable production solution
Owner mentality: obsessing over metrics, regressions, and user experience
What we offer:
4 weeks (20 working days) of PTO per year
Annual in-person meetup
Up to $200 per year for wellbeing expenses
Unlimited 1:1 sessions with psychologists and lifestyle experts through OpenUp
Co-working space budget up to 35 EUR / 40 USD per visit twice per month
Learning budget for professional growth
Company laptop provided
Monitor budget up to $250
Premium access to AI tools (ChatGPT, Cursor, Hugging Face)