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Python Developer (f/m/x)
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Offer summary

(Summary generated by AI based on the full job description)

The project involves a strategic platform for vehicle pricing and recommendations processing large data sets and delivering insights via modern APIs. Key technologies include Python, Pandas, FastAPI/Flask, PostgreSQL, and Airflow. Responsibilities cover designing and maintaining data pipelines, backend services, and API integrations, ensuring data quality and collaborating within an Agile environment. The company offers benefits such as private healthcare and professional growth support.

new

Python Developer (f/m/x)

Company: Sii Sp. z o.o.

from: 28 August 2026
to: 27 September 2026
salary not specifiedB2B contract (full-time)
salary not specifiedcontract of employment
Offer parameters
level:mid
working mode:hybrid • full office
Warszawa, Mokotów
Warszawa, MokotówAleja Niepodległości 69View on map

Requirements

Expected technologies

Python
Pandas
FastAPI
Flask
SQL
PostgreSQL

Our requirements

  • At least 4 years of professional experience as a Python Developer with a focus on backend and data development
  • Strong proficiency in Python, including experience with data-processing libraries such as Pandas
  • Experience with frameworks such as FastAPI or Flask
  • Solid SQL skills and hands-on experience with relational databases, particularly PostgreSQL
  • Experience building and orchestrating data pipelines, ideally using Airflow
  • Familiarity with Git, code reviews, testing, and CI/CD practices
  • Fluent English and Polish communication skills, with experience working in an international environment
  • Willingness to work from the Warsaw office 2–3 days per week (50% on-site)

Optional

  • Experience with Angular

Your responsibilities

  • Designing, developing, and maintaining data ingestion and transformation pipelines
  • Building and evolving the data model with a strong focus on data quality, consistency and reliability
  • Developing and maintaining Python backend services and REST APIs that expose pricing and vehicle-related data
  • Integrating internal and external systems through APIs and event-driven data flows
  • Writing clean, well-documented and well-tested code while ensuring production stability through monitoring and data quality checks
  • Collaborating closely with Product Owners, Architects, Scrum Masters and Developers to deliver scalable business solutions

About the project

We are looking for a Python Developer to join our international team developing a strategic platform that powers vehicle pricing and recommendation processes across the organization. The solution collects and processes large volumes of internal and external data, transforms it into a unified data model, and delivers pricing insights through modern APIs. As a Python Developer, you will play a key role in building scalable data pipelines, backend services, and integrations while collaborating closely with product owners, architects, and software engineers in an Agile environment.

This is how we work on a project

  • Continuous Deployment
  • Continuous Integration
Company

What we offer

  • Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas
  • Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market
  • We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022
  • Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more
  • Comfortable workplace – class A offices or remote work
  • Dozens of fascinating projects for prestigious brands from all over the world – you can change them thanks to Job Changer application
  • PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers
  • Investment in your growth – meetups, webinars, training platform and technology blog – you choose
  • Fantastic atmosphere created by all Sii Power People

Recruitment stages

  • 1.
    Send your CV
  • 2.
    Talk to us about your expectations
  • 3.
    Learn more about our projects and choose the best
  • 4.
    Start your adventure with Sii!

Sii Sp. z o.o.

Sii is the leading technology consulting, digital transformation, engineering, and business services vendor in Poland. We already employ more than 7 300 professionals and implement projects in a variety of industries for clients from many countries around the world. The Great Place to Work title, won 10 times in a row, proves that at Sii, we create a friendly work environment.
Sii ensures that all employment-related decisions are made solely on the basis of qualifications and competencies. We are committed to equal treatment of all individuals, regardless of any protected characteristics, and promoting a diverse and inclusive work environment.

This is how we work

Python Developer (f/m/x)
I apply to:
Sii Sp. z o.o.
Warszawa, Mokotów
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