Data Scientist (K/M/N)

October 21, 2026

Hybrid

Middle

Warszawa, Poland

Indeed

Keep in mind

Original vacancy is in Polish
You will likely need Polish for the job. The employer can confirm

Also worth knowing

B2B contract

Description

Nexio Management is an IT consulting company of about 550 consultants delivering systems, applications and advisory services to clients in Poland and abroad. For a client from the insurance sector the team is looking for a Data Scientist to join a project focused on a modern claims and benefits handling system. The role centres on building risk assessment models and verifying new methods and data sources across the full model lifecycle. Work format is hybrid, with hybrid, remote or on-site mode depending on the project.

Responsibilities

Build, develop and maintain fraud risk assessment models
Own the full model lifecycle: data acquisition and analysis, data preparation, model training and deployment
Select analytical and modelling methods for business problems using tabular, text and graph data
Design and develop feature engineering
Analyse data quality and identify its limitations
Verify new models and new data sources
Interpret, explain and document analysis and model results
Cooperate with business teams and developers to deploy and maintain solutions

Requirements

Minimum 3 years of experience in a Data Scientist role
Experience deploying developed models to production environments
Ability to assess model effectiveness and predict model behaviour in production
Very good knowledge of SQL
Experience building classification models, from logistic regression to gradient boosting
Practical knowledge of feature engineering
Ability to choose validation methods and model evaluation metrics
Ability to design experiments and analyse their results
Knowledge of model explainability methods, for example SHAP
Ability to program independently and run analytical experiments
Knowledge of current machine learning trends and methods
Ability to judge whether LLM use is justified compared with classical analytical methods
Nice to have: experience in fraud detection, AML or credit risk
Nice to have: knowledge of the insurance industry and NLP for the Polish language
Nice to have: experience with link analysis, graph data modelling and post-deployment model monitoring
Nice to have: Java, code repositories, automated tests and code review
Nice to have: Master's degree

Conditions

Hybrid, remote or on-site work mode depending on the project
Flexible cooperation forms: B2B contract, employment contract or mandate contract
Benefits: Medicover extended with dental care, FitProfit and English lessons
F45 gym trainings in the office with professional trainers
Internal referral program and financing of IT certificates
Long-term projects with leading companies and development across IT areas
Company events and integration trips outside the office