python developer for network planning

Flix develops technology-driven mobility solutions that make travel smarter, more sustainable, and more affordable. Its network planning optimization product helps schedule vehicles, drivers, and timetables for millions of passengers, while combining mathematical optimization with AI capabilities.

• Own and evolve the backend, including APIs, use case layers, domain models, serialization, and Kafka-based event-driven pipelines;
• Take engineering ownership of new product modules by designing architectural scaffolds, connecting layers, and maintaining clean boundaries;
• Build and maintain Kubernetes deployments, CI/CD pipelines, and AWS cloud resources;
• Collaborate with Operations Research Engineers to integrate optimization algorithms into the product;
• Build AI capabilities by combining LLMs with the optimization engine;
• Use code agents and AI assistants as part of the software delivery workflow;
• Contribute to architecture decisions and uphold code quality through reviews, testing, and continuous improvement;
• Write well-tested, self-documenting code following hexagonal architecture patterns;
• Mentor colleagues and promote knowledge sharing and learning.

• Academic background in Computer Science or equivalent;
• 5+ Years of experience in backend software engineering with Python;
• Experience with a modern front-end stack and basic front-end development;
• Production experience with clean architecture principles, including hexagonal architecture, ports-and-adapters, DDD, or similar approaches;
• Experience with relational databases, including PostgreSQL;
• Experience with event-driven systems, including Kafka or similar technologies;
• Strong experience with AI-augmented development using code agents or AI assistants in daily work;
• Solid experience with Docker, Kubernetes, and CI/CD pipelines;
• Familiarity with unit, integration, and acceptance testing best practices;
• Experience with AWS or similar cloud platforms and infrastructure as code with Terraform;
• Nice to have: Familiarity with mathematical optimization or data-intensive applications.

• 12 Free Flix vouchers and 12 discount vouchers for friends and family;
• Work from another location for up to 60 days per year, depending on the role;
• Confidential 1:1 counselling, courses, and stress management for the employee and up to four family members;
• Language classes, training courses, and expert-led sessions;
• Mentoring program.