Senior Data Modeller (Python)
At OPTIVEUM sp. z o.o. · Warsaw; Warsaw, Poland; Gdańsk; Gdańsk, Poland; Gdynia, Poland
- Data and ML
- Senior
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Where you’ll work
Hybrid, based in Gdańsk or Warsaw
“Warsaw”
From the location.
“Warsaw, Poland”
From the job board field.
“Gdańsk”
From the location.
“Gdańsk, Poland”
From the job board field.
“Gdynia, Poland”
From the job board field.
“Location: Gdańsk, Gdynia or Warsaw”
From the job description.
The job board lists it as hybrid.
Hybrid means some days in the office. The listing says how many, and where.
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- Posted
- 15 October 2026
- First seen by us
- 16 October 2026
- Last checked
- 42 hours ago
Job description
From OPTIVEUM sp. z o.o.’s job post, as they wrote it.
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 sector. 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 data models for credit and financial data processes, define data mappings across multiple systems, and work closely with business stakeholders, architects and developers on end-to-end solution design.
Read the full description
Key Details:
* Rate: up to 150 PLN/h net + VAT
* Work Model: B2B contract, full-time (40 h/week), hybrid – 2 days per week in the office
* Location: Gdańsk, Gdynia or Warsaw
* Language: Fluent English
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
* Work 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, 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
* Knowledge of credit risk, rating or financial statement data
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