NLP/ML Researcher

Our client has been into AI before it was cool and has gathered tons of research knowledge on AI, LLMs, RAGs being a personal research assistant to a solid client base. As part of their growth, they are looking for a Senior NLP/ML Researcher to join their team. In this role, you will lead the company's research around LLM evaluation, model interpretability, and mechanistic interpretation of LLMs. You'll define and drive research into how we evaluate, understand, and measure the reliability of LLMs, you will shape research directions, lead experimentations, and work closely with their engineering and product teams to turn research into products used within their platform. You'll also participate in shaping projects for EU and national research funding, leading and co-authoring grant proposals. Research Directions (the exact mix will evolve based on your strengths and interests):> LLM evaluation & uncertainty - confidence estimation, answer relevance, and robustness in open‑book QA and RAG systems.> Agentic reasoning & control - understanding when models should reason, stop reasoning, or act, including inference‑time steering.> Translation & multilingual NLP - evaluation and system design for modern LLM‑based translation, including low‑resource languages.> Mechanistic interpretation - analyzing model behavior during inference. All their metrics are focused on real-time analysis so they require model analysis during inference, not another LLM call.> Evaluation frameworks - developing scalable methods for comparing models, prompts, agents, and whole agentic systems.>>> Your goal will be turning rigorous research into capabilities that real users can trust and use. Tech stack:> Languages: Python (strong OOP practices).> ML: PyTorch, Transformers, TensorFlow.> LLMs: Hugging Face, OpenAI, custom and fine‑tuned models.> Systems: RAG pipelines, Multi-agent frameworks, Evaluation tools.> Infra: AWS, Docker, Distributed computing.> Practices: Git, CI/CD, reproducible research workflows. Requirements:> PhD in ML, NLP, Computer Science, or a related field.> Strong, hands‑on experience with R&D grants and proposal writing (e.g. Horizon Europe, EIC, national or international research funding).> 5+ years of industry or applied research experience.> Strong background in NLP (transformers, semantic search, RAG).> Hands‑on experience with LLMs and their evaluation.> Solid software engineering skills and experience with Python.> Publications in ML/NLP conferences or journals.> Able to work within European time zones. In Return, They Offer:> 100% Remote policy with hybrid options for Sofia, Bulgaria.> 30 days vacation + 5 additional days for learning and development.> A job with a global mission to advance Science.> Annual Salary Review.> Share incentivization plan.> Flexible work hours.> Personal equipment reimbursement program.> Free MultiSport card (BG).> Private Health Insurance - premium package (BG).> Career Enhancement plan.> Workshops, Conferences, Hackatons, Tech Deep Dives (internal & external). Let's chat whenever at niki@cadabra.bg(Recruitment License № 2709/ 17.01.2019)