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

Flix; Berlin; Hybrid; EUR 65.000 - 85.000; Vollzeit

Benefits dieser Stelle

Travel perks (12 free vouchers)

Work-from-anywhere capability

Hybrid work model

Wellbeing support

Learning & development programs

Mentoring program

Zusammenfassung

Flix is seeking a Senior Python Engineer to lead backend systems supporting network planning. In this role, you'll collaborate with teams to enhance algorithms and uphold high code quality standards. Candidates should have a strong background in backend development, especially in Python, with experience in containerisation and cloud platforms. The position allows for a hybrid work model, offering flexibility and various perks including travel benefits and wellbeing support.

Qualifikationen

• 5+ years of experience in backend software engineering with Python.
• Experience with modern front-end stack.
• Solid experience with containerisation and CI/CD pipelines.

Aufgaben

• Own and evolve the backend, including APIs and event-driven pipelines.
• Collaborate with Operations Research Engineers to integrate algorithms.
• Contribute to architecture decisions and uphold code quality.

Kenntnisse

Backend software engineering with Python

AI-augmented development

Containerisation (Docker, Kubernetes)

Experience with relational databases (PostgreSQL)

Event-driven systems (Kafka)

Clean architecture principles

Ausbildung

Academic background in Computer Science or equivalent

Tools

Flask

React

AWS

Terraform

DataDog

Jobbeschreibung

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 will own core backend systems that power our network‑planning optimisation product, directly supporting network planners in scheduling vehicles, drivers, and timetables — improving travel experiences for millions of passengers while driving profitability.

Our team builds and maintains an optimisation platform covering vehicle and driver scheduling to timetable optimisation. We follow modern system design principles — Domain‑Driven Design, Hexagonal Architecture, and SOLID — and enforce strict architectural boundaries through tooling. Backend workloads (APIs, event consumers, Kubernetes jobs) are built to scale while maintaining high code quality standards.

The product’s algorithm engine is developed by Operations Research Engineers. As a Senior Python Engineer, you will own the engineering shell: APIs, use cases, data pipelines, infrastructure, and domain models that bridge optimisation output to the rest of the system.

You will collaborate closely with other engineering teams to design and implement interfaces and contracts that connect our platform to the wider system landscape.

Our Current Tech Stack and Toolset

• 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 optimisation algorithms into the product
• Work in an AI‑augmented development workflow, actively using code agents and AI assistants as a natural part of shipping 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 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
• 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 containerisation (Docker, Kubernetes) and CI/CD pipelines
• Familiarity with testing best practices: unit, integration, acceptance testing
• Experience with cloud platforms (AWS or similar) and infrastructure as code (Terraform)
• Familiarity with mathematical optimisation or data‑intensive applications is a plus

What We Offer

• Travel perks: 12 free Flix vouchers plus 12 discount vouchers for friends & family
• Work-from-anywhere: up to 60 days per year from another location
• Hybrid work model: office‑first with flexibility to balance work and life
• Wellbeing support: confidential 1:1 counselling, courses, and stress management for you and up to four family members
• Learning & development: language classes, training courses, and expert‑led sessions
• Mentoring program: connect with experienced colleagues to accelerate your career

We recognize that you might not meet 100% of the requirements, but if you can have an impact we still encourage you to apply.