Mid FullStack Developer NEW

Jit; Polska; Hybrid; PLN 120,000 - 180,000; Full time

Job summary

Jit Team in Poland is seeking a Mid-level Fullstack Engineer to join the New Ventures Core Tech area. You will work across frontend and backend, building APIs and data-driven features to integrate with external partners.

The role features a flexible hybrid model based in Warsaw or Poznań, with a modern stack including React, TypeScript, Kotlin, Java, and microservices.

Qualifications

• Good programming skills in Java or Kotlin and experience with microservices.
• Practical experience with React and component-based frontend development.
• Good understanding of REST API principles, JSON, and backend endpoint integration.
• Ability to work across backend and frontend and switch contexts.
• Strong problem-solving with a pragmatic, delivery-oriented approach.

Responsibilities

• Build, adapt, and integrate APIs to enable external partners cooperation.
• Work across the full technology stack, backend and frontend.
• Develop new functionalities and adapt existing systems.
• Support onboarding and integration of external partners.
• Contribute to microservices, microfrontends, and event-driven architecture.

Skills

Java or Kotlin

React

REST API principles

Frontend development

Backend development

Microservices

Problem-solving

Tools

Docker

GitLab CI

Cloud environments

Job description

Work model: flexible hybrid, based in Warsaw or Poznań

Why choose this offer?

• You will develop modern AdTech solutions supporting advertising campaign management
• You will join a project combining frontend, backend, and Machine Learning, developing data-driven recommendation systems
• You will have the opportunity to work with a modern technology stack, including React, TypeScript, Kotlin, and GCP
• You will have a real impact on the development of microfrontends, microservices, and event-driven architecture

Project

Join the New Ventures Core Tech area as a Mid-level Fullstack Engineer and work on a dynamic project focused on rapid delivery, technical versatility, and seamless integration with external strategic partners.

The main objective of the project is to build, adapt, and integrate APIs that enable smooth cooperation with external business partners.

You will work across the full technology stack, dynamically switching between backend and frontend development depending on current project priorities. You will contribute to developing new functionalities, adapting existing systems, and supporting the onboarding and integration of external partners.

Expected competences and knowledge

• Good programming skills in Java or Kotlin and experience working with microservices
• Practical experience with React and component-based frontend development
• Good understanding of REST API principles, JSON, and backend endpoint integration
• Ability to work effectively across both backend and frontend areas and switch between different technical contexts
• Strong problem-solving skills and a pragmatic, delivery-oriented approach

Nice to have

• Familiarity with CI/CD tools, especially GitLab CI
• Experience with Docker and cloud environments
• Understanding of modern UX/UI principles and accessibility standard

Technologies you'll work with

• React
• REST APIs / JSON
• Microservices
• Cloud environments

Client - why choose this particular client from the Jit portfolio?

Our Client dominates the Polish e-commerce arena as the market leader since 1999. With a user base of over 20 million and growing, this well-established platform is at the forefront of e-commerce, constantly striving for growth through market expansion and investment. As a major player in technology, our Client boasts a talented IT team of over 1,000 employees who focus on developing their own cutting-edge technologies.

Jit Team has had a successful partnership with our Client since spring 2021, with multiple software development teams dedicated to our Client's platforms. These teams operate autonomously, designing platform components through micro-services.

Working with our Client offers a chance to contribute to a solution used by millions on a daily basis and to tackle the challenge of delivering software at a massive scale, where even a single second of delay can have a significant impact. This project provides a unique opportunity to work with state-of-the-art technologies and tools, making it a rare and valuable experience.

About Jit Team

The Human Factor of IT - it’s not just a slogan, it’s a philosophy. The foundation of Jit Team is people, which is why we prioritise you. We employ over 770 experienced experts , to whom we offer developmental projects, a wide range of benefits, and a proprietary professional development programme. Together with clients from around the world, we create innovative IT solutions delivered by highly specialised and efficient teams.

Behind our maxim are also charitable and educational activities. We support schools, universities, and educational institutions by conducting workshops, running educational projects, sponsoring events, and donating learning equipment. We offer internships that help launch careers in IT. We support water rescuers and hospitals by providing the necessary equipment. We also support numerous charitable organisations helping people in need, children, and the elderly. We are a Polish company and we share what we have achieved over more than 15 years of activity. By supporting local initiatives, we contribute to the circulation of good energy.