Senior Data Scientist

Onthespotdev; Poland; On-site; PLN 212,404 - 339,847; Full time

Job summary

Onthespotdev in Poland is seeking a talented Senior Data Scientist to join their team. This role involves designing and deploying advanced machine learning systems that enhance data-driven decisions across innovative products.

The ideal candidate will have a strong background in machine learning, optimization techniques, and collaboration with cross-functional teams. A fair benefits package and a supportive work environment await the right candidate.

Qualifications

• 5+ years in Data Science, Machine Learning Engineering, or similar roles with proven impact in production.
• Strong experience with machine learning and deep learning frameworks.
• Hands-on experience with Bayesian optimization and hyperparameter tuning.

Responsibilities

• Design, develop, and deploy scalable machine learning and optimization models.
• Build and maintain end-to-end ML pipelines.
• Collaborate with teams to translate challenges into solutions.

Skills

Machine Learning

Deep Learning

Mathematical Optimization

Bayesian Optimization

Causal Inference Methods

Time-Series Modeling

MLOps

Strong English (B2 or higher)

Education

Advanced degree (MS/PhD) in Computer Science, Mathematics, Statistics, or Engineering

Tools

PyTorch

TensorFlow

Job description

We bring startups and disruptive tech companies to the local market, offering engineers the opportunity to work on innovative, high-impact products. Join us and become a member of their R&D team while we take care of employment, HR support, a benefits package, and an enjoyable work environment.

365Scores is a global sports tech hub, providing tens of millions of users with real-time results, stats, news, and content across all major sports.

Our products are based on cutting-edge technologies that enable live updates and on-demand content libraries of the highest quality and scale.

About the role

We are looking for a talented and experienced Senior Data Scientist to join our data science team.

In this role, you will design, develop, and deploy advanced machine learning and optimization systems that power data-driven decision making across our products. You will collaborate closely with data engineers, analysts, product managers, and software engineers to transform complex business challenges into scalable machine learning solutions.

Your expertise in machine learning, mathematical optimization, and production ML systems will play a key role in building intelligent systems that operate in real-time and at scale.

Responsibilities

• Design, develop, and deploy scalable machine learning and optimization models for data-driven decision-making systems
• Build and maintain end-to-end ML pipelines, including data preparation, model training, deployment, and monitoring
• Apply advanced machine learning, deep learning, and optimization techniques to solve complex business problems
• Evaluate and improve model performance through experimentation, A/B testing, and data-driven analysis
• Deploy and maintain real-time ML systems operating at scale
• Collaborate with cross-functional teams to translate business challenges into production-ready data science solutions
• Stay up to date with the latest developments in machine learning, optimization, and AI

Requirements

• 5+ years in Data Science, Machine Learning Engineering, or similar roles with proven impact in production
• Strong experience with machine learning and deep learning frameworks like PyTorch or TensorFlow
• Good understanding of mathematical optimization (convex, constrained, gradient-based methods)
• Hands-on experience with Bayesian optimization and hyperparameter tuning
• Knowledge of causal inference methods (propensity scoring, uplift modeling, causal ML, experimentation)
• Experience with time-series modeling and forecasting
• Proven experience deploying ML models in production, including real-time systems
• Familiar with MLOps practices: experiment tracking, model versioning, A/B testing, monitoring
• Experience building end-to-end ML pipelines from data ingestion to model serving
• Applying ML to decision-making systems (pricing, bidding, ranking, resource allocation) is a plus
• Knowledge of LLMs, reinforcement learning, or agent-based AI is an advantage
• Strong English (B2 or higher), written and spoken

Nice to have

• Advanced degree (MS/PhD) in Computer Science, Mathematics, Statistics, Engineering, or equivalent experience
• Contributions to open-source ML projects or research

Benefits

At On The Spot, we’re creating a workplace people would want to stay in: supportive, well-organized, and fair in terms of conditions and benefits.

We’ll share more about our benefit package during the interviews. In the meantime, you can always check our Glassdoor reviews.

Position is open to candidates in Belarus and Poland. To work in Poland, you need to have a residence permit or another valid document allowing employment there.