Senior NLP Engineer | Flexgen

Senior NLP Engineer | Flexgen Senior NLP Engineer Posted Aug 1, 2026 Social Discovery Group is a group of social discovery companies. SDG solves the problems of loneliness, isolation, and disconnection - transforming virtual intimacy into the new normal. SDG’s products redefine the way people interact and connect with one another. Our portfolio includes social entertainment platforms designed to connect people online across different cultures and regions of the world. We bring together a team of like-minded people and IT professionals who specialize in creating and developing globally impactful social discovery products. Our international team of digital nomads works remotely from all over the world. We’re proud to be a two-time “Great Place to Work” winner (USA & Japan, 2024–2025) and a Top-5 Company for Work-From-Anywhere Jobs (FlexJobs, 2025). We are looking for Senior NLP Engineer. - Your main tasks will be: - Train and fine-tune language models powering our AI companions - Own and improve agent harnesses, agentic loops, and the chat interface algorithm - Build and maintain the full LLM stack — from model training to production deployment - Track cutting-edge NLP research and open-source developments; translate them into an NLP roadmap for the ML team - Collaborate closely with the validation, content, and dataset preparation teams to design experiments and measure model quality - We expect from you: - Deep experience training and fine-tuning large language models - Hands-on experience building agent harnesses and agentic pipelines - Strong understanding of RLHF, DPO, and other alignment/post-training techniques - Proficiency with transformers, PyTorch, and related libraries - Experience at AI-focused startups or companies (Character AI, OpenAI, and similar is a strong plus) - Backend engineering experience (Python, Go, C) and knowledge of scalable deployment systems is a significant advantage - Nice to have: - Experience with multimodal LLMs - CV