Senior Python Developer

B3 Consulting Poland; Kraków; On-site; PLN 180,000 - 240,000; Full time

Benefits offered by this job

Health and sports benefits

Speed Coaching

Sports training

Team events

Development-focused meetups

Job summary

B3 Consulting Poland is seeking a Senior Python Engineer to join our Kraków-based team. You will design, develop, and scale backend services in a SaaS architecture, delivering robust REST APIs and data-driven features for international projects.

You will collaborate with product teams and tech leads, implement analytical algorithms, and continuously improve code quality while adopting AI tooling to stay at the forefront of innovation.

Qualifications

• Strong Python fundamentals and Django development experience.
• Proficient with relational databases (PostgreSQL).
• Experience architecting, designing, and delivering scalable REST APIs.

Responsibilities

• Design, develop, and expand scalable backend services and REST APIs within a SaaS architecture.
• Implement and test analytical algorithms to ensure correctness and output accuracy.
• Collaborate with product teams and Tech Leads to analyze requirements.
• Diagnose and resolve production issues and bugs.
• Adopt AI developer tools in daily workflows and propose AI-powered features.

Skills

Python

Django

PostgreSQL

REST APIs

AI tools

English fluency

Tools

Cursor

GitHub Copilot

Claude Code

Job 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 Senior Python Engineer. Grow in an environment that cares about your development as much as you do.

Your responsibilities

• Design, develop, and expand scalable backend services, modules, and REST APIs within a SaaS architecture.
• Implement, verify, and continuously test analytical and statistical algorithms to guarantee full correctness and output accuracy.
• Analyze business and technical requirements in close collaboration with product teams, engineering peers, and Tech Leads.
• Diagnose, analyze, and efficiently resolve technical issues and production bugs.
• Actively adopt AI developer tools in daily workflows and propose concepts for new AI-powered product features.

Requirements

• Strong Python fundamentals and commercial experience developing applications with Django.
• Proficiency with relational databases (such as PostgreSQL),
• Experience in architecting, designing, and delivering scalable REST APIs.
• Daily experience using AI coding assistants (such as Cursor, GitHub Copilot, or Claude Code).
• Professional fluency in written and spoken English for seamless collaboration in an international team.
• Readiness to work with applied statistics (regressions, distributions, p-values) and implement models alongside domain experts.

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.