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

Rtb House; Polska; On-site; PLN 180,000 - 240,000; Full time

Benefits offered by this job

High degree of autonomy

Attractive compensation

Access to latest technology

Opportunity to build own products

Participation in interesting projects

Job summary

A global marketing technology company seeks a Backend Python Developer in Poland to design and maintain applications for ad campaigns. The role involves collaborating with teams, implementing services, and ensuring code quality. Candidates should have solid experience in Python, relational databases, and good problem-solving skills. The company offers attractive compensation, autonomy, and participation in significant projects. Join a fast-growing technology company that values long-term quality and reliability.

Qualifications

• Solid experience in backend development with Python.
• Familiarity with relational databases and ability to write efficient SQL queries.
• Understanding of RESTful and GraphQL APIs conventions and best practices.
• Experience in asynchronous programming.
• Good understanding of system design concepts 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.

Responsibilities

• Design, develop, and maintain internal web applications for ad campaigns management.
• Implement jobs and processes to integrate internal services.
• Contribute to the development of internal Python libraries.
• Write and maintain unit/integration tests.
• Identify issues and propose improvements for performance and stability.
• Collaborate with cross-functional teams for new features and workflow improvements.
• Apply best practices in application design and APIs.

Skills

Backend development with Python

Relational databases and SQL

RESTful and GraphQL APIs

Asynchronous programming

System design concepts

Writing and maintaining tests

Problem-solving skills

Team collaboration

Fluency in English

Tools

Google Pub/Sub

Pydantic

Pytest

GitHub Actions

Job description

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