Python Developer (f/m/x) @ Sii Polska at Sii Polska – Warszawa | Jobyssey

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)

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.

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

Nice-to-have requirements

Experience with Angular

Requirements:

Python
Pandas
FastAPI
Flask
SQL
PostgreSQL

Additionally:

Medical care,
Insurance,
Sport cards,
Language courses,
Refferal programs,
Welcome packs and other occasional gifts,
Passion Sponsorship program,
Regular integration events and trips,
Contracts with the biggest brands,
Diverse portfolio of clients,
Flexible forms of employment,
Internal training center,
Mentoring program,
Buddy Program & efficient onboarding process,
Technology communities,
Jubilee rewards,
Profit sharing,
Sport & hobby communities,
Breakfast,
drinks and fresh fruits in the office,
Wide portfolio of technologies,
Solid financial situation,
Comfortable and well-equipped offices,
MySii app,
Invoice kiosk.

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Nice-to-have requirements

Requirements:

Additionally: