Senior Backend Engineer, Python/Django (f/d/m): Path to CTO

Berlin, 35-40 hours per week, starting immediatly Do you want to work and help shape the world of work? Then join us and become part of a purpose-driven team working towards a fair and sustainable world of work. We are INES Analytics – a passionate software start-up in the heart of Berlin. Our mission: to make social sustainability measurable and to support companies in creating fair working conditions. To drive our mission forward, we’re looking for you: a committed individual to strengthen our team. A growing team, a clear mission and the chance to help shape real social change through your work – data-driven, practical and forward-looking. Tasks You'll own the backend technically and be the go-to person for architecture and infrastructure. You'll write code yourself, help the team grow, and set the technical direction. Together with us, you'll grow into the CTO role. In Detail: Own the backend (Python/Django): architecture, code quality, scalability and maintainability Design and evolve REST APIs and integrate external systems Build authentication and SSO (e.g. OAuth2, OpenID Connect, SAML) Design and run asynchronous processing and background jobs Keep the system fast and scalable as we grow: profiling, query optimization, caching Build a strong testing culture with automated unit, integration and end-to-end tests Review code and pull requests, and set shared engineering standards Mentor junior developers and support their growth Shape and improve reliable deployment, release and CI/CD processes Run and optimize our cloud infrastructure on AWS, containerized with Docker and managed as Infrastructure as Code Set up monitoring, logging and alerting so issues are caught before customers notice them Write and maintain clear technical documentation on architecture, APIs and runbooks Build security and data protection (GDPR) into our architecture and code Work closely with product, design and founders, and bring technical input to the roadmap Requirements The follow