Java Engineer

Flix; Warszawa; Hybrid; PLN 180,000 - 280,000; Part time

Benefits offered by this job

Work from (M)Anywhere for up to 60 not

Hybrid work model

Wellbeing support

Learning & Development

Mentoring Program

Job summary

Flix is seeking a skilled Java Engineer for a service agreement collaboration in Warsaw. You will design, develop and deliver reliable backend services within a self-organized team, focusing on internal tools for timetable and vehicle allocation.

You will work with AWS, Kafka, Kubernetes and Terraform to build robust APIs, event-driven integrations and scalable architectures, while ensuring quality through automated tests and code reviews.

Qualifications

• You have 3 to 5 years of experience building backend applications, with Java or Kotlin.
• You have worked in cloud environments (ideally AWS).
• You have experience with event-driven systems and Kafka.
• You can design, build and maintain APIs and data models.
• You write automated tests and value code quality.
• You communicate clearly in English and work in an Agile setup.

Responsibilities

• Design, build and maintain backend services and APIs for FlixTrain workflows.
• Develop data models and event-driven integrations between services.
• Collaborate with product and engineers to translate needs into solutions.
• Write automated tests to ensure reliability and maintainability.
• Contribute to architecture decisions and document technical outcomes.
• Operate within a distributed, Agile environment and review code.

Skills

Java

Spring Boot

Kotlin

AWS

Kafka

Kubernetes

Terraform

GraphQL

PostgreSQL

GitLab CI

CI/CD

English communication

Tools

Spring Boot

AWS

Kafka

Kubernetes

Terraform

GraphQL

PostgreSQL

GitLab CI

Job description

We are looking for a skilled Java Engineer 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 design, develop and deliver reliable backend services within a self-organized, cross-functional, distributed team. This includes building robust APIs and event-driven integrations for our internal tools, with a strong focus on internal user needs. You will also help drive backend architecture decisions and contribute to technical quality across teams through code reviews and close collaboration.

About the Engagement

• Design, build and maintain backend services and APIs that automate and simplify FlixTrain Network Planning workflows
• Develop and evolve data models and integrations, including asynchronous, event-driven communication between services
• Work with internal users, product and other engineers to understand their needs and turn them into practical technical solutions
• Write and maintain automated tests to ensure the reliability and maintainability of the services you deliver
• Collaborate with other engineers across a distributed architecture within an Agile environment
• Document technical decisions, solutions and ways of working
• Our backend stack:
  • Java with Spring Boot
  • AWS
  • Kafka
  • Kubernetes
  • Terraform for IaC
  • GraphQL
  • PostgreSQL
  • GitLab CI

About You

• You have 3 to 5 years of experience building backend applications, from which a couple of years building backend applications in Java or another JVM language such as Kotlin
• You have worked in cloud environments (ideally AWS)
• You have practical experience with at least one of the following:
  • Building and running on AWS
  • Designing, building and maintaining event-driven systems with Kafka
  • Deploying and operating workloads on Kubernetes
  • Managing infrastructure as code, ideally with Terraform
• You write automated tests as a natural part of your development process and care about code quality and maintainability
• 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

• Experience building services with Spring Boot
• Experience working with databases, relational and/or NoSQL
• Experience with CI/CD pipelines (GitLab CI or GitHub Actions)
• A DevOps mindset: you are willing to own pipelines, infrastructure and quality, not just the application code
• Experience with agentic or AI-assisted coding

We recognize that everyone carries a unique set of valuable skills and experiences. If you think you could have an impact even though you don't meet 100% of the requirements, we still encourage you to apply. We want to hear from you!

What We Offer

• Work from (M)Anywhere: Depending on your role, work from another location for up to 60 days per year.
• Hybrid work model: We are an office-first company, but we offer flexibility to balance work and life.
• Wellbeing support: Access confidential 1:1 counselling, courses, and stress management for yourself and up to four family members.
• Learning & Development: Take advantage of language classes, training courses, and expert-led sessions to grow your skills.
• Mentoring Program: Connect with experienced colleagues to gain insights and accelerate your career.

At Flix, we empower our teams to push boundaries and shape the future of mobility. As we continue to scale globally, we harness cutting-edge technology to make mobility smarter, more sustainable, and more affordable.

If you’re looking for a place where you can drive change and redefine how millions of people travel, Flix is the place where you can lead your journey!