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First seen by Alion on Nov 9, 2026.

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Sii

Sii is one of the largest technology and engineering services companies in Poland, supplying software engineers, testers, infrastructure specialists and industrial engineers to clients across Europe. Its consultants work on application development, quality assurance, cloud and network infrastructure, business intelligence, enterprise applications and embedded engineering, either inside client teams or in delivery centres run by the firm. Headquartered in Warsaw with offices in more than a dozen Polish cities, it employs several thousand specialists and is known locally for the volume of technology vacancies it advertises at any one time.
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.

Zakres obowiązków

  • 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

Wymagania

  • At least 3 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

Tech stack

  • Python
  • pandas
  • FastAPI
  • Flask
  • SQL
  • PostgreSQL
  • Apache Airflow
  • Angular
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