Java Engineer

Flix is hiring a Java Engineer in Warsaw, Poland. Level rates it ; you can apply on Flix.

Level's read on this job

On Level's scale, this role is Little AI ●○○○: aI is not part of the work.
Level classifies it as a mid-level role.
Level lists 161 other open roles at Flix.
The role was posted within the past two weeks.

AI in this role

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

How we rate this

Java Engineer at Flix rates 26 out of 100 for how much of the daily work is AI. That makes it Little AI (AI Level 1 of 4). The level is about AI in the job, not seniority.

Classification

Little AI. AI is not part of the work.

●●●● Builds AI80 to 100
●●●○ Works on AI60 to 79
●●○○ Uses AI40 to 59
●○○○ Little AI0 to 39

Levels come from how often the tools, models and workflows of the role are named in the posting itself. Read the description and count the AI tools, models and workflows it names.