Mid-Level Fullstack Engineer — Java/Kotlin + React

LATAM; Poland; On-site; PLN 120,000 - 180,000; Full time

Job summary

Xebia is seeking a software developer in Poland to join a cross-functional team. You will develop and enhance microservices using Java and Kotlin, design REST APIs and mocks, and build web components with React.

You will work across backend and frontend, integrate with external partners, and help deliver features rapidly while improving product and technical solutions. The role requires 3+ years in software development, strong Java/Kotlin skills, React experience, and English (B2) with Polish

Qualifications

• 3+ years of commercial software development experience.
• Proficient in Java and Kotlin.
• Experience with microservice architecture.
• Hands-on with React and modern JavaScript.
• Knowledge of HTML and CSS.
• Strong understanding of REST API design and consumption.
• Experience working with JSON data.
• Willingness to work across both backend and frontend.
• Experience using AI-powered assistants to improve productivity in software delivery.
• Ability to switch between multiple technologies and tasks.
• Good communication and collaboration skills.
• English at min. B2 level, Polish at min. 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

React

JavaScript

HTML

CSS

REST API

JSON

English (B2)

Polish (B1)

AI-assisted development

Backend/Frontend flexibility

Tools

Docker

GitLab CI

Cloud environments

Job description

Xebia is seeking a software developer in Poland to join a cross-functional team. You will develop and enhance microservices using Java and Kotlin, design REST APIs and mocks, and build web components with React.

You will work across backend and frontend, integrate with external partners, and help deliver features rapidly while improving product and technical solutions. The role requires 3+ years in software development, strong Java/Kotlin skills, React experience, and English (B2) with Polish