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Senior Machine Learning Researcher

Warsaw, Masovian Voivodeship, Poland

Pay
Pay not listed
Work setting
Not stated
Employment
Not stated
Apply at RTB House

What you’ll work on

Full posting
  • Design and implement deep neural network models predicting user behavior and preferences

  • Conduct and analyze A/B tests of new solutions

  • Develop new approaches to bidding in first-price auctions

  • Follow and analyze the latest work in machine learning

From the employer’s posting
Designing and implementing models, most often of deep neural networks, used to predict the behavior and preferences of Internet users
Conducting and analyzing A/B tests of new solutions
Developing and testing new approaches to modeling key issues, such as bidding in first-price auctions
Analysis of the latest works in the field of Machine Learning

What you’ll bring

All qualifications

Core experience

  • 4+ years of hands-on machine learning or data science experience
  • Knowledge of statistics and probability
  • Proficiency in programming
  • C1 level in Polish

Preferred experience

  • Experience in the ML industry
  • Experience designing recommendation systems
  • Practical knowledge of the tools the company uses
Qualification wording
4+ years of hands-on experience with Machine Learning / Data Science
Knowledge of statistics and probability
Proficiency in programming
C1 level in Polish
Experience in the ML industry
Experience in designing recommendation systems
Practical knowledge of the tools we use

Tools in this posting

  • Java
  • Python
  • Scala
  • NumPy
  • pandas
  • PyTorch
Source — Tool mentions in context
Selected technologies used: - Python, Java, Scala - PyTorch, NumPy, Pandas
- Python, Java, Scala - PyTorch, NumPy, Pandas - Jupyter Notebooks

Posting record

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Open 6 monthsWe first saw this posting 182 days ago and it is still up. Roles open this long are often slow to fill or kept open to collect applications.

Status in our records
Live
First seen by us
May 1, 2026 · 182 days ago
Recorded sightings
141
Last seen by us
Oct 30, 2026

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  • Check the listed location, eligibility and core experience before starting.
  • Ask the employer about the pay range before committing time to the process.

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Job description

View original posting ↗

Location: Poland

 

We Are:

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. As an ML Researcher, you will be responsible for its development.

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.

You Will:

  • Designing and implementing models, most often of deep neural networks, used to predict the behavior and preferences of Internet users
  • Analysis of the latest works in the field of Machine Learning
  • Conducting and analyzing A/B tests of new solutions
  • Developing and testing new approaches to modeling key issues, such as bidding in first-price auctions

Desired Experience:

  • 4+ years of hands-on experience with Machine Learning / Data Science 
  • Interest and willingness to constantly develop in the area of ​​Machine Learning
  • Knowledge of statistics and probability
  • Proficiency in programming
  • C1 level in Polish

Selected technologies used:

  • Python, Java, Scala
  • PyTorch, NumPy, Pandas
  • Jupyter Notebooks

Additional advantages will be:

  • Experience in the ML industry
  • Experience in designing recommendation systems
  • Practical knowledge of the tools we use

Sample topics:

  • Implementation and analysis of new model architectures, such as convolutional networks, transformer
  • Analyze the difference in the distribution of training and production data. Estimating the scale of the problem, identifying the best solution, analysis, implementation, deployment
  • Experiments with the use of transfer learning
  • A completely new approach to generating product recommendations that is free from proxy targets and uses contrastive loss function

We Offer:

 

  • Cooperate in a team of enthusiasts with experience in machine learning who willingly share their knowledge and skills
  • Extremely flexible cooperation conditions - you cooperate when it is convenient for you and devote as much time as you can; you can cooperate fully remotely
  • Access to the latest technologies and the possibility of real use of them in a large-scale and highly dynamic project;
  • Possibility of using the possessed knowledge and competences in practical applications - while optimizing algorithms supporting hundreds of millions of Internet users and monthly buyers of billions of advertising views in the RTB model, based on extensive data sets
  • The effects of your cooperate immediately visible in the company's business results
  • Possibility to publish your results
  • Cooperation based on B2B contract or Contract of Mandate 
  • You can cooperate 100 % remotely or choose one of our office spaces in Warsaw or Cracow.

Apply now!

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.

Source details

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Location & working pattern

Warsaw, Masovian Voivodeship, Poland

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