Senior Data Scientist

Senior • Hybrid

Warsaw, Poland

Play a key role in designing and implementing advanced machine learning solutions for scalable, production-grade systems. You will support our client from the biopharmaceutical industry and collaborate with cross-functional teams to deliver impactful data-driven solutions that align with business objectives.

This hybrid role requires working from the client’s office in Warsaw at least 1–2 days per week.

Sii ensures that all employment-related decisions are made solely on the basis of qualifications, competencies, and performance. We are committed to equal treatment of all individuals, regardless of any protected characteristics, and promote a diverse and inclusive work environment.

Your tasks

Designing, developing and implementing machine learning algorithms and statistical models to address complex business challenges
Conducting experimentation, iterative testing and evaluation to optimize model performance, accuracy, and scalability
Extracting actionable insights through advanced analytics to ensure alignment with business objectives and strategy
Collaborating with Data Engineers and Software Engineers to integrate, deploy, and monitor ML solutions in production environments
Mentoring junior team members, conducting peer reviews, and promoting best practices in data science
Supporting AWS Cloud engineering activities

Requirements

Minimum 5 years of hands-on experience with machine learning algorithms and statistical modelling
Master’s or Ph.D. degree in Computer Science, Engineering, Physics, or related quantitative field
Proficiency in Python and ML frameworks such as TensorFlow, PyTorch, or scikit-learn
Strong experience with AWS-based ML development
Familiarity with containerization (Docker, Kubernetes) and CI/CD tools
Solid knowledge of SQL and data preprocessing techniques
Ability to communicate complex concepts clearly to diverse stakeholders
Fluent Polish required
Residing in Poland required

Nice-to-have requirements

Experience with pharma industry data platforms (Veeva, IQVIA)
Expertise in deploying and managing NLP and LLM models
Knowledge of transformer architectures, prompt engineering, and generative AI applications

Sii

Sii is a company recognized as a "Great Place to Work" since 2015, thanks to employee feedback and the implementation of new ideas. Established in 2006, Sii has demonstrated financial stability with a revenue of 2.1 billion PLN and no debts. The company shares its profits with employees, having allocated over 76 million PLN for this purpose since 2022. Sii offers a rich benefits package, including private healthcare, a cafeteria platform, and discounts on cars. Employees can work in comfortable A-class offices or remotely. Sii is involved in numerous fascinating projects for prestigious global brands and invests 1 million PLN annually to support employee passions and volunteer actions. The company emphasizes personal development through meetups, webinars, a training platform, and a technology blog. Sii is characterized by a fantastic atmosphere created by its "Sii Power People."