Full-stack Developer (React / Next.js / Python) - Mid/Senior

We are part of Hiberus, a technology company founded in Spain with a strong presence in the Polish market: 4,700+ specialists, operating in 14+ countries and delivering projects for clients worldwide. We work with technologies including AI, Data, Cloud, Software Development, BI, and Cybersecurity. When one project comes to an end, we look for new opportunities within Hiberus — including projects in other countries. One of our key advantages is Hiberus University — an international learning environment offering real opportunities to develop and expand your skills. More than 1,000 people were trained last year in selected technologies. Your first project is just the beginning. With Hiberus, you can build a long-term career.

• Minimum 3 years of commercial experience as a Full-stack Developer.
• Strong knowledge of TypeScript, React, Next.js, and Python.
• Experience designing and integrating REST APIs.
• Knowledge of SQL, relational databases, and ORMs.
• Experience with asynchronous processes and third-party service integrations.
• Ability to build responsive and intuitive user interfaces.
• Familiarity with Git and best practices for code quality and testing.
• Ability to independently own tasks end-to-end, from frontend to backend.
• Self-motivated and proactive in proposing solutions.

Nice to have:

• Experience with LLMs/GenAI, OpenAI/Google Gemini, Redis, Docker, FastAPI/Flask, Vercel, and SaaS/martech products.

• Develop the web application and new product modules.
• Build responsive and high-performance user interfaces using React and Next.js.
• Develop APIs and backend services in Python.
• Integrate the frontend with the backend, databases, and external APIs.
• Build features powered by LLMs, including response streaming.
• Develop views for presenting data, campaigns, reports, and analytics.
• Optimize asynchronous processes and data processing workflows.
• Design and develop APIs based on REST and OpenAPI.
• Ensure code quality, testing, performance, security, and robust error handling.
• Contribute to the system architecture and participate in technical and product-related decisions.