Java Engineer

Project overview

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.

Our backend stack:

• Java with Spring Boot
• AWS
• Kafka
• Kubernetes
• Terraform for IaC
• GraphQL
• PostgreSQL
• GitLab CI
• 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
• 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

Project details

• Start: ASAP
• Location: Remote, Warsaw, PL
• Rate: 89-119 EUR/h