Python Developer

Python

Wadowicka 12, Kraków

Sii

Full-time

B2B, Permanent

Mid

Hybrid

Tech stack

English

B2

Docker

regular

GitHub

regular

DDD

regular

Python

regular

CI/CD

nice to have

Job description

The Embedded Competency Center is an organizational unit of Sii that brings together almost 500 specialists. We are currently looking for a Python Developer to support one of our clients. The Python Developer is a skilled professional with a strong track record in software engineering best practices, dedicated to delivering software products and applications that create significant business value. This individual will embody a continuous improvement mindset, focusing on optimizing processes and applications based on value-driven principles. The ideal candidate thrives in a global team environment and has substantial experience within the energy trading sector, demonstrating the ability to collaborate effectively and drive innovation.

Your responsibilities

• Interpreting functional requirements and aligning them with technical concepts to ensure clarity and successful implementation

• Developing solutions in line with project patterns, methodologies, standards, and industry best practices

• Delivering scalable, business-critical applications using Python

• Building applications based on an event-driven microservices architecture

• Managing databases with a focus on performance optimization, particularly in SQL Server environments

• Handling complex integration scenarios and managing interfaces across the ETRM (Energy Trading and Risk Management) landscape

• Designing, developing, and maintaining robust back-end microservices using Python

• Leveraging Azure services, GitHub Actions, CI/CD pipelines, caching techniques, and SQL databases for efficient development workflows

• Optimizing application performance and scalability through monitoring and tuning tools

• Implementing security best practices and ensuring compliance with relevant standards and frameworks

Our requirements

• At least 6 years of experience in Python software development

• Familiarity with Domain-Driven Design (DDD)

• Proficiency in writing testable code using Behavior-Driven Development (BDD)

• Experience working in agile teams and applying agile and lean methodologies

• Application of data engineering techniques alongside core software development practices

• Hands-on use of CI/CD tools; GitHub Actions experience is a plus

• Experience with cloud platforms, especially Microsoft Azure

• Proficiency with containerization technologies (e.g., Docker)

• Skills in profiling and optimizing Python code for performance

• Previous work with implementing solutions with FastAPI and asynchronous processing

• Fluent communication in English, both spoken and written

• Residency in Poland

This is how we work on a project

• BDD

• DDD

• Continuous Deployment

• Continuous Integration

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 60M 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 7 500 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. In a survey, as many as 90% of our employees responded that Sii is a great place to work, and 95% of them think we have a great atmosphere here.

Published: 16.08.2025

Meet the company

Sii

Sii Polska to czołowy dostawca doradztwa technologicznego, transformacji cyfrowej oraz usług biznesowych i inżynieryjnych. Firma obecna jest na rynku od 2006 roku, zatrudnia ponad 7 300 ekspertów, jedenastokrotnie zdobyła tytuł Great Place to Work i osiąga przychody rzędu 2,1 miliarda złotych. Sii realizuje projekty w różnych branżach, wspierając rozwój technologiczny oraz innowacje, w tym w medycynie, rolnictwie i wielu innych sektorach.

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