Fullstack Engineer

Software Engineer (Kotlin / Python / JavaScript) Location: Kraków or Warsaw (hybrid — 5 days per month in the office) Contract type: B2B — 130–140 PLN/h Project: Long-term international project About the Role We are looking for a Software Engineer to join a collaborative product team working in an iterative delivery model. The team is responsible for the full lifecycle of the product — from design and development to production support — following the principle: “you build it, you support it.” This role offers an opportunity to work with modern technologies across backend and frontend, while continuously learning new programming languages and tools. Key Responsibilities • Work in a cross-functional team of 4–6 engineers • Break down requirements into user stories and deliver iteratively to production • Design technical solutions aligned with architectural guidelines • Provide production support, including troubleshooting bugs, performance, and security issues • Identify and manage technical debt alongside new feature development • Collaborate closely with team members, including pair programming • Ensure high quality and maintainability of delivered solutions Requirements • Minimum 5 years of relevant commercial experience • Experience with at least one programming language (Kotlin, Python, or JavaScript preferred) • Willingness to learn multiple technologies across backend and frontend • Working knowledge of Unix/Linux environments • Understanding of databases from a usage perspective (MongoDB, Redis, PostgreSQL) • Experience with HTTP APIs (RESTful services) • Good English communication skills (team communication in English) Nice to Have • Knowledge of .NET / C# What We Offer • Hybrid work model — only 5 days per month from the office (Kraków or Warsaw) • Private medical care (Medicover) • Sports card (Multisport or equivalent) • Life insurance • Long-term, stable cooperation • Opportunity to work with modern technologies in an international environment • Support for professional development and learning