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:

Messaging: Google Pub/Sub
Data Handling & Validation: Pydantic, dataclasses
Testing: Pytest
CI/CD: GitHub Actions

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

IT and R&D Backend Python Developer Warsaw, Masovian Voivodeship, Poland

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