Python / Data Engineer
At B3 Consulting Poland · Warszawa, Poland
- Data and ML
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Where you’ll work
Hybrid, based in Warsaw
“Warszawa, Poland”
From the job board field.
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
- 7 September 2026
- First seen by us
- 15 October 2026
- Last checked
- 6 hours ago
Job description
From B3 Consulting Poland’s job post, as they wrote it.
We are part of an international organization listed on Nasdaq Stockholm, operating in 11 countries. In Poland, we work with full autonomy. We independently choose our technologies, processes, and ways of working while maintaining the highest professional standards.
We deliver a wide range of IT projects in Poland and internationally, across multiple domains and technologies. This allows our consultants to develop their competencies and gain experience aligned with their professional ambitions.
Read the full description
Our collaboration is built around the CARE philosophy. For us, it means responsible project matching, transparent cooperation, and a long-term approach to professional growth.
Join us as Python / Data Engineer Join a project in the fin-tech sector, building high-performance Python and PostgreSQL backends from scratch to process massive financial databases. Grow in an environment that cares about your development as much as you do.
Your responsibilities
* Designing, developing, and maintaining application backends responsible for presenting financial data.
* Collaborating on the development of internal Python libraries focused on efficient data processing and analysis.
* Creating and maintaining unit tests and integration tests to ensure data integrity and code quality.
* Identifying performance bottlenecks and proposing improvements to increase data flow efficiency, query speed, and data accuracy.
Requirements
* At least 5 years of commercial experience in Python backend development for data-intensive applications.
* Strong experience with relational databases, writing optimized SQL queries, and deep understanding of PostgreSQL internals
* Experience with PySpark and Pandas for large-scale data processing
* Methodical problem-solving skills with a focus on transactional consistency and concurrency/multithreading.
* Higher degree in STEM or Computer Science.
* High-level English proficiency for daily collaboration with remote teams
What we offer
* Work in a Scandinavian culture built on logic and dialogue.
* Health and sports benefits tailored to your needs.
* Speed Coaching – short sessions that provide new perspectives and solutions.
* Sports training, an internal team, and opportunities to take part in competitions.
* Team events and development-focused meetups.
Apply today!
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