Senior Python Software Engineer

Location: Poland

We Are:

RTB House is a next-generation performance demand-side platform (DSP) that uses proprietary Deep Learning AI algorithms to help brands grow. The company is the market leader in driving performance using Deep Learning across the entire purchase funnel. 

Founded in 2012 and now operating in 90+ markets, RTB House has always been private-by-design. It embraces first-party advertising and a relentless approach to innovation. RTB House offers end-to-end Deep Learning-powered AdTech products and solutions to maximize conversion, drive new customer acquisition, create engagement, and fuel long-term demand for a global base of clients.

In 2026, RTB House launched rtb.com, a self-service platform specifically designed to allow small and medium-sized businesses and agencies to deploy auto-built creatives and maximize performance on any budget.

You Will:

• Design, develop, and maintain our internal Automation and Monitoring platforms.

• Design and build new, reusable components and 'steps' for our low-code automation platform, enabling teams across the company to build their own workflows.

• Contribute to the development of internal Python libraries and shared frameworks that are the foundation for other services.

• Write and maintain unit/integration tests to ensure platform reliability and code quality.

• Identify issues and propose improvements to enhance platform architecture, API design, and framework usability.

• Collaborate with other engineering teams to understand their needs and deliver new platform capabilities.

• Apply best practices in API design, microservices architecture, and building extensible systems.

Desired Experience:

• Solid experience in backend development, ideally in building platforms, frameworks, or developer tools with Python.

• Familiarity with relational databases and ability to write efficient SQL queries.

• Deep understanding and hands-on experience in designing clean, extensible APIs (RESTful, GraphQL).

• Experience in asynchronous programming.

• Good understanding of system design concepts related to microservices architecture, scalability, and multi-tenant platforms.

• Experience with writing and maintaining tests.

• Problem-solving skills and the ability to work methodically through complex architectural challenges.

• Good communication skills and ability to work in a team.

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 

• 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