Middle Fullstack Engineer (Kotlin&React) PL

Xebia; Poland; On-site; PLN 150,000 - 230,000; Full time

Job summary

Xebia, a global AI-first software partner, is seeking an experienced developer to work across backend and frontend in Poland. You will build microservices with Java and Kotlin, design REST APIs, and create React components to support fast feature delivery.

You should have 3+ years of commercial experience, strong Java and Kotlin skills, microservices know-how, and proficiency in HTML/CSS and JSON. Join a cross-functional team delivering data-driven solutions with a people-first culture.

Qualifications

• 3+ years of commercial software development experience.
• Strong knowledge of Java and Kotlin.
• Hands-on microservice architecture experience.
• Proficient in HTML and CSS.
• Solid understanding of REST API design and consumption.
• Practical experience with JSON.

Responsibilities

• Developing and enhancing microservices using Java and Kotlin.
• Designing, developing, and modifying REST APIs and backend mocks.
• Building web components and purchase/registration flows with React.
• Working across backend and frontend and adapting to 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 continuous product and solution improvements.

Skills

Java

Kotlin

Microservices

HTML

CSS

REST API design

JSON

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,
• good knowledge of HTML and CSS,
• solid understanding of REST API design and consumption,
• practical experience working with JSON,