By combining the latest payment technologies with imagination and expertise, we create a new world of payments.
Senior Data Scientist – Contractor
Location
Poland
Posted
18 days ago
Salary
0
Seniority
Senior
Job Description
Senior Data Scientist – Contractor
myPOS
• Own the full lifecycle of complex modelling programmes across Customer & Commercial Intelligence: CLTV, Churn Prediction, Propensity to Buy, and Next Most Likely Product (NMLP) • Architect multi-horizon churn models and build the churn intervention scoring layer that prioritises at-risk merchants for Account Management teams • Lead the NMLP engine - designing and productionizing a multi-output recommendation system that identifies the next product across myPOS's full catalogue • Take technical ownership of core fraud model components: transaction-level classifiers, merchant behaviour anomaly detectors, and new-account fraud scorers optimised for high-throughput, low-latency inference • Architect and own the Next Best Action (NBA) decisioning engine - a real-time system that selects the highest-expected-value action for each merchant at every interaction • Design and build production-grade agentic AI systems that automate high-value analytical and operational workflows • Define and execute experiment designs for online evaluation - A/B tests, uplift experiments, and bandits - and analyse results with statistical rigour • Set and enforce technical standards across the team: code quality, reproducibility, evaluation rigour, model documentation, and MLOps practices • Produce high-quality model documentation and present complex modelling work clearly to stakeholders across Sales, Marketing, Risk, Product, and Operations
Job Requirements
- MSc or PhD in Computer Science, Statistics, Applied Mathematics, Econometrics or a related quantitative field (or equivalent commercial experience)
- 7+ years of applied data science and ML experience in a commercial environment, with a strong portfolio of models in production that drove measurable business outcomes
- Expert Python for data science and ML engineering: pandas, scikit-learn, XGBoost / LightGBM, PyTorch or TensorFlow; clean, tested, modular code as a default
- Deep expertise across the ML methodological spectrum: survival analysis, time-series and sequence modelling, uplift and causal inference, anomaly detection, and recommendation systems
- Proven end-to-end ownership of at least three of: CLTV models, churn models, propensity models, fraud/risk models, recommendation or NBA systems - in a production commercial setting
- Strong MLOps capability: feature stores, model registries, model serving infrastructure, drift monitoring, and CI/CD for ML pipelines
- Deep SQL and data platform proficiency (GCP / BigQuery strongly preferred); experience with streaming architectures for real-time feature generation
- Hands-on expertise building LLM-powered applications: RAG pipelines, tool-use agents, multi-agent orchestration, and agent evaluation frameworks
- Strong experience with causal inference methods: uplift modelling, difference-in-differences, or instrumental variables
- Excellent communication: able to present complex technical work to senior business stakeholders and write high-quality model documentation.
Benefits
- Excellent compensation package
- myPOS Academy for upskilling and training
- Unlimited access to courses on LinkedIn Learning
- Refer a friend bonus as we know that working with friends is fun
- Teambuilding, social activities and networks on a multi-national level
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