nlp engineer

Joi AI is a platform for personalized, emotionally intelligent connections between people and AI characters. The company builds characters with distinct personalities, moods, and voices, aiming to facilitate long-term AI-based relationships. Joi Lab, the research arm of the organization, develops open-source generative models, agent architectures, and training infrastructure.

• Train and fine-tune language models for AI companions;
• Own and improve agent harnesses, agentic loops, and chat interface algorithms;
• Build and maintain the full LLM stack from training to production deployment;
• Track cutting-edge NLP research and translate developments into an NLP roadmap;
• Collaborate with validation, content, and dataset preparation teams to design experiments and measure model quality.

• Deep experience in training and fine-tuning large language models;
• Hands-on experience building agent harnesses and agentic pipelines;
• Strong understanding of RLHF, DPO, and other alignment or post-training techniques;
• Proficiency with transformers, PyTorch, and related libraries;
• Nice to have: Experience at AI-focused startups, backend engineering experience (Python, Go, C#), knowledge of scalable deployment systems, experience with multimodal LLMs, CV background, image/video model experience, and distributed training on large-scale datasets.

• 28-Day annual leave;
• 7 Yearly wellness days;
• Referral rewards up to $5000;
• 50% Coverage for training, conferences, and global meetups;
• Subsidized English classes;
• Health support up to $1,000 annually;
• $1000 Every three years for home office or co-working setup;
• Peer-to-peer recognition program with bonuses.