Java Engineer (AWS)

Location: Hybrid work model; office-first company. Work from another location is available for up to 60 days per year depending on the role.

Rate: 89–119 PLN/hour on a B2B contract.

Company

Flix develops technology for smarter, more sustainable, and more affordable mobility, including FlixTrain internal planning tools.

What you will do

• Design, develop, maintain, and deliver backend services and APIs that automate FlixTrain Network Planning workflows.
• Build data models and asynchronous, event-driven integrations between services.
• Work with internal users, product partners, and engineers to turn operational needs into technical solutions.
• Write automated tests and maintain service reliability, code quality, and maintainability.
• Contribute to backend architecture, code reviews, technical documentation, and Agile collaboration across a distributed architecture.

Requirements

• 3–5 years of experience building backend applications, including a couple of years with Java or another JVM language such as Kotlin.
• Professional experience working in cloud environments, ideally AWS.
• Practical experience with at least one of: building and running systems on AWS; designing, building, and maintaining Kafka-based event-driven systems; deploying and operating workloads on Kubernetes; or managing infrastructure as code, ideally with Terraform.
• Experience writing automated tests as part of the development process, with a focus on 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 and the ability to explain complex domains clearly; interest in transportation, logistics, or similar domains is a positive signal.

Nice to have

• Experience building services with Spring Boot.
• Experience with relational and/or NoSQL databases.
• Experience with CI/CD pipelines, including GitLab CI or GitHub Actions.
• DevOps mindset and willingness to own pipelines, infrastructure, and quality in addition to application code.
• Experience with agentic or AI-assisted coding.

Culture & Benefits

• B2B service agreement collaboration within a self-organized, cross-functional, distributed team.
• Hybrid, office-first work model with flexibility to work from another location for up to 60 days per year depending on the role.
• Travel benefits including 12 free Flix vouchers and 12 discount vouchers for friends and family.
• Confidential one-to-one counselling, courses, and stress-management support for the employee and up to four family members.
• Language classes, training courses, expert-led sessions, and a mentoring program.