Full-Stack Engineer (Kotlin + React) for AI Microservices

Xebia; Poland; On-site; PLN 180,000 - 240,000; Full time

Job summary

Xebia is seeking a software professional to develop and enhance microservices using Java and Kotlin, and to design REST APIs and frontend components with React. You will work across backend and frontend areas, collaborating with partners and the team to deliver features efficiently.

The role requires 3+ years of experience, strong REST/JSON skills, and openness to occasional Warsaw office visits. Work from the EU region with a valid work permit is required.

Qualifications

• 3+ years of commercial software development experience.
• Good knowledge of Java and Kotlin.
• Practical experience with microservice architectures.
• Good knowledge of HTML and CSS.
• Strong understanding of REST API design and consumption.
• Practical experience with JSON.
• Willingness to work across backend and frontend development.
• Experience using AI-powered assistants to improve productivity in software delivery.
• Ability to quickly switch between different technologies and tasks.
• Good communication and collaboration skills.
• English at least B2 level.
• Polish at least B1 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 microservices using Java and Kotlin.
• Designing, developing, and modifying REST APIs and backend mocks.
• Building web components, purchase flows, and registration processes using React.
• Working across both backend and frontend areas, adapting to changing project needs.
• Integrating solutions with external business partners and supporting partner-facing functionalities.
• Collaborating with the team to deliver new features quickly and efficiently.
• Contributing to the continuous improvement of the product and technical solutions.

Skills

Java

Kotlin

Microservices

REST API

HTML/CSS

JSON

React

English (B2)

Polish (B1)

AI-powered tools (e.g., Claude Code, C

Tools

Docker

GitLab CI

CI/CD

Job description

Xebia is seeking a software professional to develop and enhance microservices using Java and Kotlin, and to design REST APIs and frontend components with React. You will work across backend and frontend areas, collaborating with partners and the team to deliver features efficiently.

The role requires 3+ years of experience, strong REST/JSON skills, and openness to occasional Warsaw office visits. Work from the EU region with a valid work permit is required.