Mid-Level Full-Stack Engineer — Kotlin + React

Engg; Poland; On-site; PLN 140,000 - 210,000; Full time

Job summary

Xebia is a global AI-first, digital transformation, and engineering partner. We design and build scalable products and data-driven solutions across Europe, employing an engineering-first culture and a strong emphasis on growth and knowledge sharing.

The role involves developing microservices with Java/Kotlin, crafting REST APIs, and implementing frontend components with React. You will collaborate across backend and frontend areas and engage with external partners to deliver features rapidly and

Qualifications

• 3+ years of commercial experience in software development.
• Strong knowledge of Java and Kotlin.
• Experience with microservice architecture.
• Hands-on experience with React and modern JavaScript.
• Good knowledge of HTML and CSS.
• Solid understanding of REST API design and consumption.
• Practical experience using JSON.
• Willingness to work across both backend and frontend development.
• English at min. B2 level, Polish at min. B1 level.
• Willingness to occasional visits to the Warsaw office (1–2 days per quarter).
• Work from the EU region and a work permit are required.

Responsibilities

• Develop and enhance microservices using Java and Kotlin.
• Design, develop, and modify REST APIs and backend mocks.
• Build web components and registration flows using React.
• Work across backend and frontend areas, adapt to project needs.
• Integrate solutions with external business partners and support partner-facing features.
• Collaborate with the team to deliver new features quickly and efficiently.
• Contribute to continuous improvement of product and technical solutions.

Skills

Java

Kotlin

Microservices

React

JavaScript

HTML

CSS

REST APIs

JSON

English (B2)

Polish (B1)

AI-powered tools

Tools

Docker

GitLab CI

AWS

Azure

GCP

Job description

Xebia is a global AI-first, digital transformation, and engineering partner. We design and build scalable products and data-driven solutions across Europe, employing an engineering-first culture and a strong emphasis on growth and knowledge sharing.

The role involves developing microservices with Java/Kotlin, crafting REST APIs, and implementing frontend components with React. You will collaborate across backend and frontend areas and engage with external partners to deliver features rapidly and