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B3 Consulting Poland

Python Developer

B3 Consulting Poland Warsaw, Masovian Voivodeship, Poland

IT Services and IT Consulting · 201-500 employees

14 h ago
python Senior (5-10 yrs) Contractor Poland
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About the role

Design, develop, and maintain high-performance application backends for processing financial data. Collaborate on internal Python libraries and ensure code quality through rigorous unit and integration testing.

What they look for

Python PostgreSQL SQL Backend development Data processing Data analysis Unit testing Integration testing Performance optimization Problem-solving Communication skills Teamwork

Requirements

Requires at least 5 years of commercial experience in Python backend development for data-intensive applications. Candidates must possess strong SQL skills with PostgreSQL and hold a higher degree in STEM or Computer Science.

Benefits

Health benefits Sports benefits Speed coaching Sports training Team events Development-focused meetups

Full description

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.

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 Developer. Join a brand-new greenfield project in the banking 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.
  • Experience with relational databases and writing optimized, high-performance SQL queries, specifically with PostgreSQL.
  • Methodical problem-solving skills and ability to tackle complex data challenges.
  • Good communication skills and ability to work effectively in a team environment.
  • High-level English proficiency for daily collaboration with remote teams.
  • Higher degree in STEM or Computer Science.
  • You need to live in Poland and/or be eligible to work here.

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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