Middle Fullstack Engineer (Kotlin&React)

xebiacee; Poland; On-site; PLN 180,000 - 260,000; Full time

Job summary

Xebia is hiring a software developer to shape backend services and modern web interfaces. You will work across Java/Kotlin microservices and React-based frontend components, contributing to rapid feature delivery within a collaborative team.

Ideal candidates bring 3+ years of experience, strong REST API design skills, and comfort with microservice architectures. This role emphasizes full-stack collaboration and continuous improvement of the product and framework.

Qualifications

• 3+ years of commercial experience in software development.
• Solid knowledge of Java and Kotlin.
• Hands-on experience with microservice architecture.
• Experience collaborating across backend and frontend domains.

Responsibilities

• Developing and enhancing microservices using Java and Kotlin.
• Designing and evolving REST APIs and backend mocks.
• Building web components and user flows with React.
• Working across backend and frontend areas to adapt to project needs.
• Integrating with external partners and supporting partner-facing features.
• Collaborating to deliver new features quickly and efficiently.
• Contributing to product and technical improvements.

Skills

Java

Kotlin

Microservices

REST APIs

React

Frontend basics

Tools

Docker

GitLab CI

Job description

Xebia is a global AI-first, digital transformation, and engineering partner. With over 25 years of experience and a team of 5,000 professionals across 16 countries, we help organizations design and build scalable products, platforms, and data-driven solutions.

We specialize in Artificial Intelligence, Data and Cloud, Intelligent Automation, and Digital Products, combining deep technical expertise with a strong focus on engineering excellence and a people-first culture.

In the CEE region, we're a team of nearly 1,000 experts delivering modern applications, data platforms, and AI solutions for clients such as McLaren, Aviva, Deloitte, Spotify, Disney, ING, UPS, Tesco, Truecaller, AllSaints, Volotea, Schmitz Cargobull, Allegro, InPost, and many, many more. We work with leading technologies including AWS, Azure, GCP, Databricks, and Snowflake, and combine strong engineering culture with a consulting mindset and a continuous focus on growth and knowledge sharing.

You will be:

• 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.

Your profile:

• 3+ years of commercial experience in software development,
• good knowledge of Java and Kotlin ,
• practical experience working with microservice architecture,
• hands‑?

Nice to have:

• experience with Docker and CI/CD processes, particularly GitLab CI,
• experience working with cloud environments,
• understanding of UX/UI principles,
• familiarity with Responsive Web Design (RWD),
• experience integrating with external partner systems,
• experience applying GenAI in a more structured way within the SDLC, including defined workflows, prompt patterns, or tool integrations embedded into daily work,
• interest in and familiarity with emerging AI-driven practices (e.g. agent-based workflows, automation patterns, AI-augmented development), with a willingness to explore and experiment beyond standard approaches.

Recruitment Process: CV review - HR call - Technical Interview - Client Interview - Decision