Backend Engineer (Java/Kotlin) — Microservices & AI Tools

Xapply; Polska; Hybrid; PLN 180,000 - 280,000; Full time

Job summary

Xebia is seeking a backend software engineer to join an automotive marketplace project. You will design and build scalable microservices using Java/Kotlin and Spring Boot, delivering REST APIs and robust backend systems.

You will collaborate with Product, Data, and UX teams, maintain high code quality, and leverage AI-assisted development tools to improve productivity and decisions. Remote-friendly EU region and occasional Warsaw visits are required.

Qualifications

• Strong commercial experience with Java and Kotlin.
• Hands-on experience with Spring Boot.
• Practical experience designing and developing microservices architectures.
• Experience building and maintaining backend services and REST APIs.
• Strong focus on code quality, testing, and engineering best practices.
• Ability to design new modules and improve existing systems.
• Practical experience using AI-powered assistants (e.g. Claude Code, GitHub Copilot, Cursor) to improve productivity, quality, or decision-making in software delivery.
• Ability to work effectively with Product, Data, and UX teams.
• Polish and English at B2 level.
• Openness to occasional visits to the Warsaw office (1-2 days per quarter).
• Work from the European Union region and a work permit are required.

Responsibilities

• Developing and enhancing scalable backend services for a specialized automotive marketplace.
• Designing and developing microservices and REST APIs supporting key customer journeys.
• Designing new modules and improving existing platform components.
• Collaborating closely with Product Managers, Data Analysts, and UX Designers to translate business needs into technical solutions.
• Ensuring high standards of code quality, testing, maintainability, and engineering best practices.
• Using AI-assisted development tools such as GitHub Copilot or OpenCode to support software delivery.

Skills

Java

Kotlin

Spring Boot

Microservices

REST APIs

Code quality & testing

AI-powered assistants

Cross-functional collaboration

English (B2)

Warsaw visits

Tools

MongoDB

Spring Data MongoDB

Google Cloud Platform (GCP)

Job description

Xebia is seeking a backend software engineer to join an automotive marketplace project. You will design and build scalable microservices using Java/Kotlin and Spring Boot, delivering REST APIs and robust backend systems.

You will collaborate with Product, Data, and UX teams, maintain high code quality, and leverage AI-assisted development tools to improve productivity and decisions. Remote-friendly EU region and occasional Warsaw visits are required.