Senior Data Modeller (Python)

Optiveum; Warszawa; Hybrid; PLN 165,000 - 193,000; Full time

Job summary

Optiveum seeks a Senior Data Modeller (Python) to design and maintain data models for a banking client, translating business needs into scalable solutions and ensuring accurate data flows between systems.

The role is full-time with a hybrid work model, based in Poland, requiring collaboration with stakeholders and development teams across data and analytics initiatives.

Qualifications

• Extensive experience in data modelling and solution design.
• Strong SQL skills and hands-on experience with relational databases.
• Good programming skills in Python.
• Experience with data integration, transformation and data mapping across multiple systems.
• Understanding of APIs, system integrations and process modelling.
• Experience ensuring data quality, consistency and governance standards.
• Fluent English, both written and spoken.

Responsibilities

• Design and maintain data models supporting credit and financial data processes.
• Analyse business requirements and translate them into scalable technical solutions.
• Define and manage data mappings between multiple systems to ensure accurate data integration and transformation.
• Ensure data quality, consistency, traceability and auditability across the solution landscape.
• Collaborate with business stakeholders, architects and development teams on end-to-end solution design.
• Prepare and maintain technical documentation and functional specifications.
• Support process optimisation and automation using AI-assisted tools.
• Take part in solution implementation, testing and continuous improvement.

Skills

Data modelling

SQL

Python

Data integration

APIs

Governance

Analytical skills

Stakeholder management

English

Tools

Kafka

Power BI

Java

Job description

Senior Data Modeller (Python)

About the Offer

We are currently looking for a Senior Data Modeller (Python) to join the team of our client from the banking industry. For this role, Optiveum is the recruitment and contracting party, which means you will sign the cooperation agreement directly with us.

You will design and maintain the data models behind the client's credit and financial data processes, translating business requirements into scalable solutions and making sure data flows accurately between systems.

Key Details:

• Rate: up to 140 PLN/h

• Work Model: Hybrid, 3 days per week in the office

• Location: Gdańsk/Gdynia or Warsaw

• Workload: Full-time (40 h/week)

Responsibilities:

• Design and maintain data models supporting credit and financial data processes

• Analyse business requirements and translate them into scalable technical solutions

• Define and manage data mappings between multiple systems to ensure accurate data integration and transformation

• Ensure data quality, consistency, traceability and auditability across the solution landscape

• Collaborate with business stakeholders, architects and development teams on end-to-end solution design

• Prepare and maintain technical documentation and functional specifications

• Support process optimisation and automation using AI-assisted tools

• Take part in solution implementation, testing and continuous improvement

Requirements:

• Extensive experience in data modelling and solution design

• Strong SQL skills and hands-on experience with relational databases

• Good programming skills in Python

• Experience with data integration, transformation and data mapping across multiple systems

• Understanding of APIs, system integrations and process modelling

• Experience ensuring data quality, consistency and governance standards

• Strong analytical and problem-solving skills

• Experience working directly with business stakeholders and translating their requirements into technical solutions

• Fluent English, both written and spoken

Nice to Have:

• Knowledge of Kafka

• Experience with Power BI

• Familiarity with Java development

• Understanding of data warehouse concepts and architecture

• Experience using AI tools for documentation, testing, data analysis or development support

• Experience in banking, finance or regulatory reporting environments

• Knowledge of credit risk, rating or financial statement data domains