We are currently seeking an experienced Backend Software Engineer to join Kraków Hub. Our ideal candidate is someone who thrives in a high growth environment with rapidly evolving needs. This individual will contribute to our forms platform, working across multiple codebases including our legacy PHP system, modern Python-based AI agents, and frontend components. You don’t have to check all the checkboxes in the job description. We’re looking for driven and curious engineers who are open about learning new technologies and solving problems.What your day could consist of: Supporting forms platform Maintaining and enhancing form rendering, processing, and submission logic in our PHP application Contributing to our AI-powered form generation Enhancing AI-driven form optimization and personalization features Developing features in the forms dashboard and form builder Optimizing form rendering and user experience Working with cross functional teams Engaging in pairing and code reviews Participation in the on-call rotation for incidents What is needed: 4+ years of work experience in a software engineering role. Demonstrated knowledge of the challenges of scaling SaaS systems Experience writing production code in PHP following accepted coding standards Experience with Python for backend services Familiarity with DB technologies: MySQL, DynamoDB, Redis Strong problem-solving skills and ability to work across multiple codebases and technologies Nice to have: Experience or interest in frontend technologies such as React or Angular Experience or interest in AI/ML system or LLM integrations Familiarity with CI/CD practices and patterns Knowledge of AWS (or any public cloud) Understanding of form builders