Senior Data Scientist | AI Engine

Wellhub (formerly Gympass); Ferrandina; Remoto; EUR 55.000 - 65.000; Tempo pieno

Descrizione del lavoro

Wellhub is seeking a Senior Data Scientist for its AI Engine team in Portugal. This pivotal role involves leveraging generative AI to enhance wellness solutions, collaborating with a multidisciplinary team to drive innovation and impact. Applicants should have strong expertise in Python and machine learning frameworks, along with a master's degree or PhD in a relevant field. The position offers a full remote work policy and competitive benefits for optimal work-life balance.

Servizi

Access to digital fitness programs

Subsidy for onsite gyms

Flexible work options

Minimum of 25 days paid holiday

100% paid parental leave

Opportunities for career growth

Supportive culture

Competenze

• Strong proficiency in Python and SQL is mandatory.
• Excellent communication skills for explaining technical concepts.
• Experience in machine learning frameworks required.

Mansioni

• Develop and fine-tune AI models using state-of-the-art techniques.
• Implement structured function calling and data preparation.
• Collaborate with engineering teams to deploy models.

Conoscenze

Python

Machine Learning

Generative AI

Deep Learning

Problem Solving

Communication

Formazione

Master’s degree or PhD in Computer Science, Data Science, or related field

Strumenti

PyTorch

TensorFlow

Descrizione del lavoro

At Wellhub (formerly Gympass) (Permanent), in Lisbon, Portugal

Salary : €55.000 - €65.000

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 and contribute to groundbreaking projects in Generative AI. In this role, 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 be at the forefront of innovation, developing cutting-edge Agentic AI to enhance and personalize the wellness journey for millions of Wellhub subscribers. Your work will directly contribute to advancing AI’s role in wellness, making it more adaptive, impactful, and transformative. You will collaborate with a multidisciplinary team of engineers and domain experts to create innovative AI applications and solve real-world problems.

YOUR IMPACT

• Model Development & Fine tuning: Understanding of state-of-the-art deep learning techniques, such as Transformers architectures and attention mechanisms, and knowledge of fine-tuning LLMs using techniques like LoRA, QLoRA, among others.
• Function Calling & Tool Use: Design and implement structured function calling mechanisms within LLMs to enable dynamic interactions with APIs, databases, and retrieval-augmented generation (RAG) pipelines.
• Prompt Engineering: Craft clear instructions that help our models understand exactly what we need, creating reusable templates and testing against edge cases.
• Data Preparation: Preprocess, analyze, and curate high-quality datasets to train and fine-tune both embedding and generative models.
• Evaluation and Testing: Develop robust evaluation frameworks to assess agentic AI performance, combining automated evaluation (LLM-as-judge), adversarial testing, human-in-the-loop evaluations, and custom behavioral metrics.
• LLM Observability: Establish monitoring systems that track LLM behavior in production, capturing key metrics around information retrieval, hallucinations, and latency.
• Research and Innovation: Stay current with the latest research in generative AI, share insights with the team, test promising approaches, and help improve our solutions.
• Deployment: Collaborate with engineering teams to deploy models in scalable and efficient production environments.

Live the mission: Inspire and empower others by genuinely caring for your own wellbeing and your colleagues. Promote wellbeing at work and create a supportive environment where everyone feels comfortable taking care of themselves, taking time off, and maintaining work-life balance.

Main requirements

• Master’s degree or PhD in Computer Science, Data Science, Machine Learning, Statistics, or a related field.
• Proficiency in Python and experience with machine learning frameworks such as PyTorch, TensorFlow, or similar.
• Strong understanding of generative AI architectures, including transformers and attention mechanisms.
• Experience in multi-agent systems and LLMs.
• Strong problem-solving skills, with a focus on experimental design and data analysis.
• Excellent verbal and written communication skills, with the ability to explain complex technical concepts to non-technical stakeholders.
• Clear scientific thinking and a passion for integrating R&D and cutting-edge technology into products.

We encourage applicants to apply even if they don't meet 100% of the requirements. Prior experience in Python and SQL is mandatory for this role.

Benefits & Perks

We are committed to the health and wellbeing of our employees. Our benefits include:

• WELLHUB: Access to digital fitness programs and online wellness resources for meditation, nutrition, mental health, and more. The Gold plan is provided at no cost, with other premium plans available at a discount.
• FITNESS: Subsidy for onsite gyms and fitness studios.
• FLEXIBLE WORK: Options for hybrid and full remote work, with a home office stipend and flexible work allowance.
• FLEXIBLE SCHEDULE: Flexibility to adjust working hours based on personal schedule, time zone, and business needs.
• PAID TIME OFF: Minimum of 25 days paid holiday per year, with additional days based on tenure, plus holiday on your birthday.
• PARENTAL LEAVE: 100% paid parental leave for new parents and extended maternity leave.
• CAREER GROWTH: Opportunities for personal and professional development.
• CULTURE: A supportive, high-growth environment with passionate colleagues worldwide, emphasizing trust, flexibility, and integrity.