Senior Data Scientist

Make an impact
by working for sectors where technology is the enabler, everything is ground-breaking and there's a constant need to be innovative.

Create and enhance projects
in Java, Python, Angular, PHP, .NET and so much more while diving in the world of Blockchain, Artificial Intelligence, Data Science, Security and Internet of Things.

Be part of the team
that combines business knowledge, technological edge and a design experience. Our different backgrounds and know-how are key in developing solutions and experiences for digital clients.

Face challenges
and learn other ways of thinking and seeing the world - there's always room for your energy and creativity.

About The Role
We are looking for a Senior Data Scientist with strong technical expertise and proven leadership capabilities to act as a
Tech Lead / Team Leader
. In this role, you will guide the design and development of advanced AI and machine-learning solutions, lead multidisciplinary teams, define technical architecture, and ensure high-quality delivery aligned with best MLOps practices. You will play a key role in shaping project direction, mentoring team members, and driving the successful deployment of AI systems in production.

As a part of your job, you will:

• Lead and mentor Data Science teams, ensuring technical excellence, timely delivery, and alignment with project goals.
• Define solution architectures, modeling strategies, and delivery roadmaps for complex AI/ML initiatives.
• Leverage data and domain knowledge to design and drive impactful business solutions.
• Work closely with cross-functional stakeholders to clarify problem statements, gather requirements, and translate them into actionable technical plans.
• Oversee the development of optimization models, experimentation frameworks, forecasting algorithms, and capacity-planning models.
• Ensure robust deployment, monitoring, and governance of ML solutions following industry-standard MLOps practices.
• Review and validate code, models, and architectures produced by the team.
• Communicate insights, recommendations, and technical decisions to executives, product teams, and clients.

What are we looking for?

• Degree in Computer Science, Engineering, Mathematics, Statistics, Operations Research, or a related analytical field.
• Strong expertise in Python and experience with PySpark/Spark MLlib.
• Experience with Generative AI, LangChain, RAG (Retrieval Augmented Generation), LLM production deployments, and Agentic AI architectures.
• Experience with OCR and document intelligence workflows.
• Solid understanding of NLP, text analytics, and unstructured data processing.
• Deep knowledge of ML architectures and MLOps-oriented lifecycles (CI/CD for ML, model versioning, monitoring, retraining pipelines).
• Hands-on experience with NumPy, SciPy, Pandas, Scikit-learn, Matplotlib, TensorFlow/PyTorch.
• 5+ years of professional experience in Data Science, including leading or mentoring technical teams.
• Experience with Java, Scala, or Spark in production environments.
• Proven track record of leading data science projects end-to-end with MLOps best practices.
• Computer Vision experience, in image pre-processing and analysis.

Nice to have:

• 2+ years of experience with SQL.
• Knowledge of distributed/cloud environments: AWS, Azure, GCP, Cloudera.
• Understanding of Data Governance frameworks.
• Experience with Azure Document Intelligence.

Personal traits

• Ability to adapt to different contexts, teams, and Clients;
• Teamwork skills but also a sense of autonomy;
• Motivation for international projects and ok if travel is included;
• Willingness to collaborate with other players;
• Strong communication skills.

At Celfocus, we are committed to cultivate a diverse and inclusive workplace. As an equal-opportunity employer, we welcome applicants of all backgrounds, gender identities, and abilities. We are dedicated to providing reasonable accommodations for candidates with specific needs. If you require any adjustments during the selection process, please inform our Talent Acquisition Team.

Come join the Team
Celfocus is pioneering the future of business through Next-Gen Intelligence - the convergence of data, AI, and human creativity to build more autonomous and adaptive organisations.
Guided by our core belief - Making Data Actionable - we partner with leading companies to co-create intelligent solutions that turn data into insight, agility, and business value.

Operating in over 25 countries, we bring together business experts, data scientists, and AI engineers to turn complexity into clarity and vision into measurable impact.

Founded in 2000, Celfocus is part of Novabase, listed on Euronext Lisbon.

To know more, visit