Backend Python Developer

RTB House; Województwo mazowieckie; On-site; PLN 167,400 - 279,000; Full time

Benefits offered by this job

High degree of autonomy

Access to the latest technology

Opportunity to build and improve products

Participation in interesting projects

Flexible contract options

Job summary

RTB House in Poland is seeking a Backend Python Developer to enhance their internal tools for real-time bidding. In this role, you will design and maintain web applications, implement integrations, and collaborate with cross-functional teams. Ideal candidates will have strong backend experience with Python, familiarity with SQL databases, and knowledge of RESTful APIs. Join a fast-growing tech company to make a meaningful impact in digital marketing. Flexible contract options are available.

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.
• Experience with writing and maintaining tests.
• Problem-solving skills and ability to work methodically.
• Good communication skills and ability to work in a team.
• Fluency in English.

Responsibilities

• Design, develop, and maintain internal web applications.
• 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.
• Collaborate with cross-functional teams.
• Apply best practices in application design, databases, and APIs.

Skills

Backend development with Python

Relational databases (PostgreSQL, BigQuery)

RESTful and GraphQL APIs

Asynchronous programming

System design concepts

Writing and maintaining tests

Problem-solving skills

Communication skills

Fluency in English

Tools

Python

FastAPI

PostgreSQL

BigQuery

Ariadne

Google Pub/Sub

Pydantic

Pytest

Sentry

Prometheus

Grafana

GitHub Actions

GCP

Kubernetes

Job description

Overview

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. 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
• 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
• Collaboration with flexible contract options (B2B or contract of mandate)

Apply

You don\'t need to tick every box to apply. If you are passionate about digital marketing, send us your CV, and we\'ll review it.