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RTB House is a global company that provides state-of-the-art marketing technologies for top brands and agencies worldwide. Its proprietary ad-buying engine is the first in the world to be powered entirely by Deep Learning algorithms, enabling advertisers to generate outstanding results and reach their goals at every stage of the funnel. We are looking for a Backend Python Developer to join our internal team at RTB House. You will work on applications and tools that directly support our real-time bidding business, collaborating with experienced engineers and product teams. This position is ideal for developers who want to grow their skills, solve real-world problems, and build reliable software that makes a visible difference. You Will: Design, develop, and maintain internal web applications responsible for ad campaigns management, e.g. configuration, monitoring, automation Implement jobs and processes to integrate internal services Contribute to the development of internal Python libraries and shared frameworks Write and maintain unit/integration tests to ensure code quality and reliability Identify issues and propose improvements to enhance performance, scalability, and stability Collaborate with cross-functional teams to deliver new features and improve existing workflows Apply best practices in application design, databases, and APIs Desired Experience: Solid experience in backend development with Python Familiarity with relational databases and ability to write efficient SQL queries (PostgreSQL, BigQuery is a plus) Understanding of RESTful and GraphQL APIs conventions and best practices Experience in asynchronous programming Good understanding of system design concepts (e.g. scalability, caching, reliability) and willingness to learn more Experience with writing and maintaining tests Problem-solving skills and the ability to work methodically through technical challenges Good communication skills and ability to work in a team Fluency in English Selected Technologies: Backend: Python, FastAPI Databases: PostgreSQL, BigQuery GraphQL: Ariadne Messaging: Google Pub/Sub Data Handling & Validation: Pydantic, dataclasses Testing: Pytest Monitoring: Sentry, Prometheus, Grafana CI/CD: GitHub Actions Cloud: GCP, Kubernetes We Offer: Being part of a small team with a high degree of autonomy and decision-making Attractive compensation Access to the latest technology in the developed solution Opportunity to build and improve our own products, where long-term quality and reliability truly matter Participation in one of the most interesting projects of the online industry in Poland and one of the fastest growing technology companies in Europe