Senior Backend Developer (f/m/d)
Offer summary

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

The project focuses on software for energy storage systems within the batteries team, emphasizing integration of a battery optimizer into IT infrastructure. The technical stack includes Python, backend for distributed systems with REST APIs and message queues (e.g. FastAPI, Azure Service Bus), containerization and IaC (e.g. Docker, Terraform, Azure), with MILP and GCP considered advantages. Responsibilities cover architecture, development and deployment of back- and front-end Python applications, enhancement and customization of the MILP optimization engine, mentoring on engineering best practices, collaboration with internal teams and external providers, serving as contact for optimizer users and coordinating software changes. Offered benefits include private medical care, language course subsidies, flexible hours and remote/hybrid work, Multisport and a city-center office.

you can start ASAP

Senior Backend Developer (f/m/d)

Company: Axpo Polska sp. z o.o.

from: 22 October 2026
to: 21 November 2026
salary not specifiedcontract of employment (full-time)
Offer parameters
level:mid • senior
working mode:hybrid
Warszawa, Wola
Warszawa, Wolarondo Daszyńskiego 2BView on map

Requirements

Expected technologies

Terraform
Docker
Azure

Optional technologies

Databricks
SQL

Our requirements

  • University degree in computer science, engineering, mathematics, natural sciences, or a related discipline
  • You have 3+ years of experience in Python or another object-oriented language, ideally as a software engineer in the energy sector or a related field
  • Experience with backend development in distributed systems using REST APIs and message queues, e.g., FastAPI and Azure Service Bus
  • Familiarity with infrastructure as code to ship containerized software to the cloud – ideally Terraform, Azure, and Docker; experience with Google Cloud Platform is a plus
  • You're comfortable with modern engineering practices such as CI/CD, code reviews, and automated testing

Optional

  • Uou bring experience with mathematical optimization (especially MILP), Databricks, frontend development, or SQL

Your responsibilities

  • Architect, develop, and deploy back- and front-end Python applications, integrating our battery optimizer into Axpo's IT infrastructure
  • Enhance our mixed-integer linear programming (MILP) optimization engine, customizing it for battery projects across different countries and markets
  • Advise and support team members on software engineering best practices and design patterns
  • Collaborate with internal teams across Europe and align with external software providers to ensure seamless system integration
  • Serve as a point of contact for internal users of our optimization software, addressing questions and requests
  • Coordinate and implement software changes and updates to meet user needs

About the project

Join Axpo in shaping the future of energy. As part of our Batteries team, you'll build the software that powers smarter, cleaner energy systems across Europe. We value diversity and welcome your unique perspective.
Details about the salary range for this position and other components of the compensation package will be provided in the following stages of the recruitment process.
Company

What we offer

  • Full-time job based on employment contract.
  • Development in an international company that is shaping the face of the energy market.
  • A progressive medical care package that takes care of your health and well-being.
  • Co-financing of the Multisport card, enabling the use of various forms of physical activity.
  • Foreign language classes during working hours.
  • Flexible working hours and the possibility to work in hybrid mode.
  • An office with a beautiful view, located in the city center.
  • A motivated team, ready to guide you through your daily challenges.

Benefits

  • private medical care
  • sharing the costs of foreign language classes
  • remote work opportunities
  • flexible working time
  • leisure zone
  • holiday funds
  • employee referral program

Axpo Polska sp. z o.o.

At Axpo Group, we are dedicated to fostering a culture of non-discrimination, tolerance, and inclusion. As an equal opportunity employer, we welcome applications regardless of race and ethnicity, gender identity and expression, sexual orientation, age, disability, as well as socioeconomic, cultural, and religious background. We are committed to ensuring a respectful and inclusive recruiting process and workplace for everyone.

This is how we work

Senior Backend Developer (f/m/d)
I apply to:
Axpo Polska sp. z o.o.
Warszawa, Wola
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