Senior Python Engineer (m/f/d)

We're building AI into the product itself — combining LLMs with our optimization engine to solve planning problems in new ways.

Our current tech stack and toolset include:

• Python, TypeScript, Shell scripting
• Flask, React, Pytest
• PostgreSQL, Confluent Kafka, DataDog
• AWS tools, Terraform
• GitLab, Kubernetes, Docker, Azure AD

About the Role

• Own and evolve the backend: APIs, use case layer, domain models, serialization, and event-driven pipelines (Kafka)
• Take engineering ownership of new product modules — designing the architectural scaffold, wiring layers, and ensuring clean boundaries
• Build and maintain infrastructure: Kubernetes deployments, CI/CD pipelines, and cloud resources (AWS)
• Collaborate closely with Operations Research Engineers to integrate optimization algorithms into the product
• Build AI capabilities into the product by combining LLMs with our optimization engine
• Work in an AI-augmented development workflow — actively using code agents and AI assistants as a natural part of how you ship software
• Contribute to architecture decisions and uphold code quality through reviews, testing, and continuous improvement
• Write well-tested, self-documenting code following hexagonal architecture patterns
• Share your expertise and mentor colleagues, promoting a culture of knowledge sharing and learning

About You

• Academic background in Computer Science or equivalent
• 5+ years of experience in backend software engineering with Python
• Experience with modern front-end stack (some basic front-end tasks are part of our scope)
• Experience applying clean architecture principles (hexagonal, ports-and-adapters, DDD) or similar approaches in production — able to contribute from day one
• Experience with relational databases (PostgreSQL) and event-driven systems (Kafka or similar)
• Strong experience in AI-augmented development — actively using code agents or AI assistants in daily work
• Solid experience with containerization (Docker, Kubernetes) and CI/CD pipelines
• Familiar with testing best practices: unit, integration, acceptance testing
• Experience with cloud platforms (AWS or similar) and infrastructure as code (Terraform)
• Familiarity with mathematical optimization or data-intensive applications is a plus

We recognize that everyone carries a unique set of valuable skills and experiences. If you think you could have an impact even though you don't meet 100% of the requirements, we still encourage you to apply. We want to hear from you!

What We Offer

• Travel perks : 12 free Flix vouchers + 12 discount vouchers for friends & family.
• Work from (M)Anywhere : Depending on your role, work from another location for up to 60 days per year.
• Hybrid work model : We are an office-first company, but we offer flexibility to balance work and life.
• Wellbeing support : Access confidential 1:1 counselling, courses, and stress management for yourself and up to four family members.
• Learning & Development : Take advantage of language classes, training courses, and expert-led sessions to grow your skills.
• Mentoring Program : Connect with experienced colleagues to gain insights and accelerate your career.

To view more local benefits specific to each office location, please check out this link: Locations - Flix Career

Why Join Flix?

At Flix, we empower our teams to push boundaries and shape the future of mobility. As we continue to scale globally, we harness cutting-edge technology to make mobility smarter, more sustainable, and more affordable.

If you're looking for a place where you can drive change and redefine how millions of people travel, Flix is the place where you can lead your journey!

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