At Wellhub (formerly Gympass), in Lisbon, Portugal Expires at : 2025-12-09 Remote policy : Full remote We are hiring a Senior Data Scientist for our AI Engine team in Portugal! We seek a talented and motivated Data Scientist to join our team in Brazil / Portugal, contributing to innovative projects in Generative AI. You will help shape the future of AI-powered wellness solutions by leveraging Generative AI, fine-tuning LLMs, and evaluating Agentic systems. As a Data Scientist in the CARE team, you will develop cutting-edge Agentic AI to enhance personalized wellness experiences for millions of Wellhub subscribers. Your work will advance AI's role in wellness, making it more adaptive and impactful. You will collaborate with engineers and domain experts to create innovative AI applications and solve real-world problems. YOUR IMPACT Model Development & Fine tuning : Understanding of deep learning techniques, transformers, attention mechanisms, and fine-tuning LLMs using methods like LoRA, QLoRA. Function Calling & Tool Use : Design mechanisms within LLMs for dynamic API, database interactions, and RAG pipelines. Prompt Engineering : Create clear instructions, reusable templates, and test edge cases. Data Preparation : Preprocess, analyze, and curate datasets for training and fine-tuning models. Evaluation and Testing : Develop frameworks to assess AI performance, including automated, adversarial, and human-in-the-loop evaluations. LLM Observability : Monitor LLM behavior in production, tracking metrics like hallucinations and latency. Research and Innovation : Stay updated with latest research, share insights, and test new approaches. Deployment : Collaborate on deploying models in scalable production environments. Live the mission : Inspire and empower others by caring for your well-being and that of your colleagues. Promote a supportive environment for work-life balance. Main requirements Master’s degree or PhD in Computer Science, Data Science, Machine Learning, Statistics, or related fields. Proficiency in Python and experience with frameworks like PyTorch or TensorFlow. Strong understanding of generative AI architectures, transformers, and attention mechanisms. Experience with multi-agent systems and LLMs. Strong problem-solving skills, experimental design, and data analysis. Excellent communication skills for explaining complex concepts. Clear scientific thinking and passion for integrating R&D into products. We encourage applicants to apply even if they don't meet all criteria. Prior experience in Python and SQL is mandatory for this role. Our benefits include : WELLHUB : Access to digital fitness and wellness resources, with a complimentary Gold plan. FITNESS : Subsidies for onsite gyms and studios. FLEXIBLE WORK : Hybrid or full remote options, with stipends and allowances for home office setup. FLEXIBLE SCHEDULE : Adjust working hours based on personal and business needs. PAID TIME OFF : Minimum 25 days holiday plus additional days based on tenure. PARENTAL LEAVE : 100% paid parental leave for new parents. CAREER GROWTH : Opportunities for personal and professional development. CULTURE : A supportive, high-growth environment with global colleagues committed to trust, flexibility, and integrity. J-18808-Ljbffr J-18808-Ljbffr