Flix
Mobility
SeniorPythonEngineer(m/f/d)-NetworkPlanning
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“Senior Python Engineer (m/f/d) - Network Planning at Flix. Skills: Python, Backend engineering, Architecture, Cloud platforms. Own and evolve backend systems. Take ownership of new product modules”
What You'll Achieve.
Improve travel experiences for millions; Drive profitability; Ship software
Industry & Context.
Optimization platform; Mathematical optimization
What They're Looking For.
Must Have
5+ years of experience in backend software engineering with Python, Experience with modern front-end stack, Experience applying clean architecture principles (hexagonal, ports-and-adapters, DDD) or similar approaches in production, Experience with relational databases (PostgreSQL), Experience with event-driven systems (Kafka or similar), Experience in AI-augmented development, Solid experience with containerization (Docker, Kubernetes), Solid experience with CI/CD pipelines, Experience with cloud platforms (AWS or similar), Experience with infrastructure as code (Terraform)
Nice to Have
Familiarity with mathematical optimization or data-intensive applications
What You'll Do.
Own and evolve backend systems
Take ownership of new product modules
Build and maintain infrastructure
Collaborate with Operations Research Engineers
Contribute to architecture decisions
Write well-tested code
Share expertise and mentor colleagues
How You'll Work.
Team & Collaboration
Collaborate closely with other engineering teams; Collaborate with Operations Research Engineers; Share expertise and mentor colleagues
Full Job Description
At Flix, we offer a tech-driven environment where innovation meets real-world impact, with competitive pay, strong growth opportunities, and a culture of collaboration and ownership. We're looking for an experienced Senior Python Engineer (m/f/d) to join our Supply Division. You'll make an impact by taking ownership of core backend systems that power our network planning optimization product. Your work will directly support network planners in scheduling vehicles, drivers, and timetables — improving travel experiences for millions of passengers while driving profitability. Our team builds and maintains an optimization platform addressing use cases from vehicle and driver scheduling to timetable optimization. We follow modern system design — Domain-Driven Design, Hexagonal Architecture, and SOLID principles — with strict architectural boundaries enforced by tooling. Our backend workloads (APIs, event consumers, Kubernetes jobs) are built to scale with high code quality standards. The product's algorithm engine is developed by Operations Research Engineers using mathematical optimization. As a Senior Python Engineer, you will own the engineering shell around these algorithms: the APIs, use cases, data pipelines, infrastructure, and the domain models that connect optimization output to the rest of the system. You'll collaborate closely with other engineering teams to design and implement the interfaces and contracts that connect our platform to the wider system landscape. 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
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