Rate: 90 – 120 PLN/hour (B2B)
We are looking for a skilled Fullstack Engineer (Frontend focused) for service agreement collaboration (B2B contract) to cooperate with a team dedicated to Network Planning at FlixTrain - building internal tools that help plan the timetable and vehicle allocation, reduce manual processes, and increase productivity. This is a greenfield environment with plenty of room to shape new products from the ground up and explore innovative solutions for our internal users.
Scope of Services
You will independently develop and deliver high-quality frontend features, with occasional backend work, within a self-organized, cross-functional, distributed team. This includes building intuitive user interfaces with a focus on the experience of our internal users. You will also help drive frontend architecture decisions and contribute to technical quality across teams through code reviews and close collaboration.
About the Engagement
- Design and build internal web applications that automate and simplify FlixTrain Network Planning workflows
- Develop modern, responsive user interfaces with React and TypeScript and contribute to a consistent, reusable frontend architecture
- Design and implement backend functionality, including GraphQL APIs, server-side logic and database models
- Work with internal users and stakeholders to understand their needs and turn them into practical product solutions
- Write and maintain automated tests, to ensure reliability and maintainability
- Collaborate with other engineers across a distributed architecture within an Agile environment
- Document technical decisions, solutions and ways of working
About You
Must have:
- Hands-on experience with React (React 19 in our stack) and TypeScript, with a strong command of HTML and CSS
- Experience with an object-oriented backend language. Java is not required, but preferable: Node.js or similar is acceptable, provided you have real backend development experience, not just scripting
- Hands-on experience in backend web application development: building and designing GraphQL APIs, server-side logic and database design
- Experience writing tests and working with test runners such as Vitest
- Understanding of event-driven systems and how to work with them
- Solid written and spoken English skills
- Experience working in an Agile setup
- Curiosity about the business domain. Interest in transportation, logistics or similarly complex domains is a good signal, as is the ability to explain such a domain clearly
Nice to have:
- GraphQL: used in our stack (Spring for GraphQL, Apollo, gql.tada)
- Java and Spring Boot / Spring Framework
- Kafka
- Experience with agentic or AI-assisted coding
Collaboration Model
- Contract type: Cooperation based on a service agreement (B2B/freelance contract), not an employment contract
- Working model: Independent contractor responsible for delivering agreed services and submitting invoices
- Location: Open for contractors based in Poland
Skills Required
- Hands-on experience with React, preferably React 19, and TypeScript
- Strong command of HTML and CSS
- Experience with an object-oriented backend language; Java is preferred, while Node.js or similar is acceptable
- Real backend web application development experience, including GraphQL APIs, server-side logic, and database design
- Experience writing automated tests and using test runners such as Vitest
- Understanding of event-driven systems
- Solid written and spoken English skills
- Experience working in an Agile setup
- Curiosity about transportation, logistics, or similarly complex business domains
- Experience with GraphQL technologies such as Spring for GraphQL, Apollo, or gql.tada
- Experience with Java and Spring Boot or Spring Framework
- Experience with Kafka
- Experience with agentic or AI-assisted coding
What We Do
Flix is a global travel tech leader providing sustainable and affordable travel options to more than 60 million yearly travelers in 43 countries through its brands FlixBus, FlixTrain, Greyhound, and Kamil Koç. By combining network planning, marketing, and pricing, Flix uses innovative solutions to enable comfortable, sustainable, and affordable travel worldwide. Through our tech platform and user-friendly app, Flix creates a travel experience tailored to passengers' needs and connects travelers with local business partners providing transportation, ensuring a modern fleet that adheres to the highest safety standards. This asset-light business model has turned a European start-up into a leading and globally expanding travel-tech champion. Flix is pioneering and testing alternative drives with a long-term strategy to progressively decarbonize its fleet. Together with our partners and customers, we are driving transformative change towards the future of mobility, gradually reshaping the mobility sector and enabling more sustainable travel modes. Check out https://flix.careers/ to see how you can join our team. For our legal imprint click here: https://global.flixbus.com/legal-notice
