Python Developer (f/m/x) @ Sii Polska

Sii Polska; Warszawa; Hybrid; PLN 180,000 - 240,000; Full time

Benefits offered by this job

Medical care

Insurance

Sport cards

Language courses

Welcome packs

Job summary

Sii Polska in Poland is seeking a Python Developer to join our international team, focusing on backend and data development. You will help build scalable data pipelines, REST APIs for pricing and vehicle data, and collaborate with product owners, architects, and engineers in an Agile setup.

The role requires 4+ years of Python experience, strong data tooling (Pandas), SQL (PostgreSQL), and experience with FastAPI or Flask, plus 50% on-site work in Warsaw.

Qualifications

• At least 4 years of professional experience as a Python Developer with a backend and data focus.
• Strong proficiency in Python, including data-processing with 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 in an international environment.
• Willingness to work from the Warsaw office 2–3 days per week (50% on-site).

Responsibilities

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

Skills

Python

English and Polish fluency

Tools

Pandas

FastAPI

Flask

PostgreSQL

Airflow

Git

Job description

• 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.