Senior Fullstack Engineer with Java/ React/ TypeScript (f/m/x)

Sii Ukraine LLC; Katowice; Hybrid; PLN 120,000 - 180,000; Full time

Job summary

Sii Ukraine LLC in Katowice is looking for a developer to work on an advanced planning platform, building and integrating backend and frontend layers to deliver a cohesive, scalable solution across multiple markets.

The project is in active development with a strong focus on performance, reliability, and architectural direction, including the use of AI and LLM tools to support daily work. On-site presence is expected, with 1 day in the Katowice office per quarter.

Skills

Backend development

Frontend development

AI/LLM tools

Job description

Join the team developing an advanced planning platform that is scaled across multiple markets and supports complex business processes. You will work on a large-scale product where performance, reliability, and further development are key. The role involves developing both the backend and frontend layers, with a focus on building a cohesive and scalable solution.

The project is in a phase of intensive development and scaling, which gives a real impact on architecture and technological direction. An essential part of the job will also be the active use of AI and LLM tools, which are an integral part of the development environment and support the daily work of the team.

Expected availability to work from the office in Katowice – 1 day per quarter.