Senior Python Engineer (m/f/d) - Network Planning

Senior Python Engineer (m/f/d) - Network Planning

City: Berlin

Department: IT & Engineering

Recruiter: Mykhailo Shpygotskyi

Apply for Job

Share Job

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.

Were looking for an experienced Senior Python Engineer (m/f/d) to join our Supply Division. Youll 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 products 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.

Our current tech stack and toolset include:

Python, TypeScript, Shell scripting

Flask, React, Pytest

PostgreSQL, Confluent Kafka, DataDog, Honeycomb

Amazon RDS/S3/CloudFront/SecretsManager, Terraform (Terragrunt)

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

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

Work in an AI-augmented development workflow — actively using code agents and AI assistants as a natural part of how you ship software

About You

Academic background in Computer Science or equivalent

5+ years of experience in backend software engineering with Python

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)

Experience with modern front-end stack (some basic front-end tasks are part of our scope)

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 dont meet 100% of the requirements, we still encourage you to apply. We want to hear from you!