# Java Engineer

- **Company:** [Flix](https://aijobsgrid.com/companies/flix)
- **Location:** Warsaw, PL
- **Remote:** No
- **Salary:** Not disclosed
- **Posted:** 2026-11-02
- **Status:** Open

**Apply:** https://aijobsgrid.com/api/jobs/ajg-b14ce3/apply (opens the employer's own application page)

## Job description

Rate: 89 – 119 PLN/hour (B2B)

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**

- **Travel perks**: 12 free Flix vouchers + 12 discount vouchers for friends & family.
- **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.

To view more local benefits specific to each office location, please check out this link: [Locations - Flix Career](https://flix.careers/locations/)

**Why Join Flix?**

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!

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