Senior Backend Developer Python

About Vatix Vatix is a fast-growing SaaS company founded in London and Kraków in 2019. We're on a mission to bring a fresh, user-centric approach to the world of Governance, Risk, and Compliance software — with a particular focus on Health & Safety and Operational Excellence. Today, over 800 businesses and government organisations around the world trust our platform to protect their people, streamline safety workflows, and drive operational performance. We're not VC-owned, and we're not chasing vanity metrics. Instead, we're building a long-term, sustainable company focused on solving real-world problems and becoming one of the most consequential players in our category. Our customers include industry leaders such as Cambridge University, Siemens, Intel, and major government departments — organisations that depend on us for mission-critical systems. At Vatix, you'll work across a diverse product suite spanning web applications, mobile apps, IoT-enabled safety devices, and data platforms. That means a rare opportunity to learn and grow across a range of technologies — all while being supported by a collaborative team that values quality, simplicity, and mentorship. The Role Location: Kraków, Poland (Hybrid - 3 days per week in office) Contract: B2B Level: Senior We're looking for a Senior Backend Developer who combines deep Python expertise with a forward-thinking approach to software development. You'll be instrumental in designing and building the backend systems that power our platform, working alongside a talented team that values clean architecture, continuous improvement, and leveraging modern tools including AI-assisted development. What You'll Do Design and implement robust backend services using Python and Django, ensuring scalability, maintainability, and performance Lead the architecture and design of new features and services with a focus on API-first development and deep understanding of standards Champion clean, well-documented, and efficient code with a strong commitment to testing and quality Ensure data integrity and efficiency in database usage, particularly with PostgreSQL, and guide optimisation strategies as needed Collaborate closely with frontend developers, QA, and DevOps to integrate backend systems into the broader product ecosystem Identify and solve complex problems with a strategic mindset, considering both immediate needs and long-term system evolution Set coding standards and development practices within the team, fostering a culture of engineering excellence Stay up-to-date with the latest backend technologies and architectural approaches, and drive continuous improvement in our engineering processes Embrace AI-powered development tools to accelerate development, improve code quality, and explore new approaches to problem-solving What We're Looking For Technical Skills: Advanced Python and Django expertise Experience with Django REST Framework Advanced PostgreSQL knowledge Mastery of API design and standards Familiarity with DevOps practices Mindset: Openness to modern development tools and practices, including AI-assisted coding Curiosity about emerging technologies and how they can improve workflows Willingness to experiment and continuously improve Soft Skills: Strong communication skills in English Strategic thinking with attention to both immediate and long-term implications Collaborative approach to working with cross-functional teams Commitment to mentoring and sharing knowledge How We Work Design before implementation. Always Continuous integration & quality assurance before shipping Small, frequent releases over big, risky ones Scrum, retrospectives, and room for improvement Hybrid: 3 days per week in our Kraków office, with flexibility on remaining days AI tools encouraged and supported as part of our development workflow What We Offer B2B contract Hybrid work culture (3 days in Kraków office) A fast-paced, supportive environment focused on learning and mentorship Training budget and regular growth check-ins Access to modern development tools, including AI coding assistants Regular team meetups and collaboration sessions Holiday entitlement aligned with Kodeks Pracy (Labour Code) Office Location: Józefitów 8, Kraków. If you're excited by the idea of joining a company with serious ambition, a clear roadmap, and a strong focus on people, this is the place to build your career.