Senior Data Scientist

Summary

Join ShiftKey as a Senior Data Scientist and play a key role in shaping the future of our data science function. You will lead the development and deployment of advanced machine learning models, impacting business outcomes and driving growth. Based in Poland (remote or Warsaw office), you will lead the full ML model lifecycle, from problem understanding to impact measurement. You will build and improve predictive models using various techniques, design and implement Generative AI solutions, and utilize Graph Neural Networks for relationship modeling. This role requires strong communication skills and collaboration with various teams. ShiftKey offers a high-growth environment with opportunities for career development and various benefits.

Requirements

• 6+ years of data science experience, ideally with a background in two-sided marketplaces or supply chain management
• Experience with advanced ML models like regression, neural networks, and recommender systems
• Proficiency in Python, SQL, and popular libraries like scikit-learn, PyTorch, TensorFlow, and XGBoost
• Familiarity with LLMs and Generative AI frameworks (e.g., LangChain, Hugging Face, OpenAI API)
• Experience with network graph analysis and building/deploying GNN solutions (using tools like networkx, iGraph, PyG)
• Comfortable writing production-level code and working with software engineers and MLOps teams
• Strong communication skills for effective coordination across teams

Responsibilities

• Lead the full process of ML models: You will be in charge of everything from understanding the business problem, determining how AI/ML can provide value, exploring data, building features, developing models, deploying them, tracking their performance, and measuring their impact on the business
• Build and improve predictive models: You’ll use statistical methods and deep learning to create models for things like market segmentation, forecasting, recommendations, pricing strategies, and fraud detection
• Design and implement Generative AI solutions: You’ll work on tasks like fine-tuning large language models, creating effective prompts, and generating synthetic data for both internal tools and customer-facing applications
• Use Graph Neural Networks for relationship modeling: You’ll apply these models to understand relationships between healthcare facilities, professionals, and other related attributes like shifts

Benefits

• A high-growth, friendly, and engaging work environment with opportunities for career development
• Additional vacation days for better work-life balance
• Modern office in Warsaw’s Powiśle district with Vistula River views, recreational facilities, and great nearby restaurants
• Thoughtfully designed private medical package to take care of what matters most
• Sports card to fuel your active lifestyle
• Life and accident insurance for peace of mind