Senior Backend Developer (Python/Django; 100% remote) 💰 Salary: 23,400-25,500 PLN/month  🌎 100% Remote 🕦 Full-time position ☑️ B2B or Contract of Employment  We are looking for a Senior Backend Developer for a partner client with a compelling mission: they act as a product and technology partner for early-stage B2B SaaS founders, helping them navigate the crucial journey from launch to their first million in revenue. They essentially become the dedicated tech backbone for these startups.Requirements: 5+ years of professional backend development experience. Extensive, proven experience with Python and the Django framework. Proficient in data modelling, relational and non-relational databases, and complex SQL queries. Strong experience with API design, integrations, and distributed systems (synchronous & asynchronous communication). Hands-on experience with Docker, Redis, message brokers, and cron jobs. Expertise in writing unit tests (e.g., Pytest) and a commitment to code quality and testing best practices. Great understanding of English with strong communication and collaboration skills. Nice to have: Previous experience in Greentech or Ecotech is a significant plus. Experience as an unofficial tech lead or mentoring junior developers. Knowledge of additional testing methodologies (integration, end-to-end). Responsibilities: Lead the design and development of complex server-side applications, APIs, and databases, taking ownership of architectural decisions. Architect, write, and deliver high-quality, scalable, and efficient code using Python and Django. Collaborate closely with cross-functional teams, including front-end developers and the tech lead, to align backend development with project goals. Architect and implement advanced user authentication, authorisation, and security mechanisms. Conduct performance analysis and optimisation, identifying bottlenecks and implementing solutions. Drive the implementation of automated testing and CI/CD processes to ensure code reliability. Establish and enforce coding standards, conduct thorough code reviews, and document backend architecture and APIs. Take responsibility for system reliability, scalability, and security, ensuring best practices. Get to know DevsDataWe are a technology consulting company and a recruitment agency, delivering software solutions to clients from Europe and the US. We work 100% remotely, in an international team, including people from Asia, London, or San Francisco. We employ people with experience in international corporations as well as students of the best technical and business universities.Find out more: https://devsdata.com