Senior Applied Data Scientist — AI & Entity Resolution

Bain & Company; Warszawa; On-site; PLN 180,000 - 240,000; Full time

Job summary

Bain & Company in Warszawa is seeking a Senior Applied Data Scientist to develop and evaluate ML models for entity resolution at scale. You will work closely with data scientists, data engineers, and software engineers to bring advanced matching approaches into production, focusing on experiment-driven improvements and cost-efficient solutions.

You will apply embeddings, LLMs, and neural network techniques, collaborating across teams to ensure high-quality model performance and practical

Qualifications

• 5–8 years of relevant professional experience in applied data science, machine learning, or a related field.
• Strong applied machine learning expertise, including hands-on experience building and evaluating models using real-world data.
• Excellent Python and SQL skills.
• Practical experience with embeddings, semantic similarity, LLMs, or related AI techniques.
• Hands‑on experience training supervised and unsupervised models, including classification and NLP applications.
• Working knowledge of neural networks and transformer architectures.
• Experience with machine learning frameworks such as TensorFlow, PyTorch, or PyCaret.
• Experience retraining taxonomy classifiers or maintaining classification models in production.
• Strong experimental judgment, including the ability to define baselines, evaluation metrics, test sets, and error analyses.
• Ability to clearly explain model behavior, technical trade‑offs, and edge cases to engineering and business stakeholders.

Responsibilities

• Develop and evaluate machine learning models for entity resolution.
• Improve matching accuracy, scalability, and cost.
• Collaborate with data and software engineers to productionize models.
• Design robust evaluation metrics and benchmarks.
• Analyze errors to drive improvements.
• Translate hypotheses into experiments and findings.

Skills

Python

SQL

Embeddings

LLMs

NLP

Neural networks

Transformer architectures

Experimental design

Model evaluation

Tools

TensorFlow

PyTorch

PyCaret

Spark

Snowflake

Databricks

BigQuery

Job description

Bain & Company in Warszawa is seeking a Senior Applied Data Scientist to develop and evaluate ML models for entity resolution at scale. You will work closely with data scientists, data engineers, and software engineers to bring advanced matching approaches into production, focusing on experiment-driven improvements and cost-efficient solutions.

You will apply embeddings, LLMs, and neural network techniques, collaborating across teams to ensure high-quality model performance and practical