Senior Data Scientist

Sofia, Bulgaria | Hybrid

Who we are

ROITI is a boutique consulting company focused on energy trading and risk management (ETRM). Since 2013, we’ve been working with energy and commodities clients across Europe to solve problems that sit right where trading, technology, and data meet.

Our projects cover the full trading value chain – from improving ETRM systems and reporting, to optimizing assets and data flows, to helping clients adapt to the fast-changing energy landscape driven by renewables, storage, and new market rules.

Behind every trade, every asset decision, and every risk calculation sits one thing: data. At ROITI, we turn that data into insights and our Data Science team brings it to life through models, algorithms, and clear visualizations.

The role

We’re looking for a Senior Data Scientist to join our team in Sofia.

It’s not just models for the sake of models. Your work will shape how energy companies trade, manage risk, and optimize assets.

You’ll work closely with consultants and developers, moving from raw datasets to insights, algorithms, and visualizations that our clients can actually use.

What you’ll do

• Explore complex datasets and turn them into actionable insights.

• Build, test, and improve models and algorithms for real-world problems.

• Work with time series, NLP, and Machine Learning Algorithms.

• Create visualizations that make results clear and useful.

• Collaborate with colleagues and clients on end-to-end solutions.

What you bring

• Analytical thinking, curiosity, and clean coding habits.

• Good English communication and a collaborative spirit.

• Willingness to travel occasionally for projects.

Core skills:

• Python (with solid coding practices).

• Machine learning and deep learning methods.

• Time series modeling (ARIMA, Prophet, TFT, etc.).

• Libraries like PyTorch, TensorFlow, or Keras.

• Data visualization Tools/Libraries.

• SQL databases and version control (Git, SVN).

• NLP techniques and familiarity with LLMs.

• Cloud platforms (AWS, Azure, GCP) and MLOps practices.

Nice to have:

• Knowledge of energy trading and economics.

• ML platforms (Azure ML, MLFlow).

• Databricks, or Spark.

• NoSQL databases, Kafka, or RabbitMQ.

What you’ll find at ROITI

• A competitive package with additional stimuli in the long-term.

• Health and dental benefits, Multisport card, additional paid leave days for each year in the company and Loyalty program.

• A team that values openness, respect, ownership, and play.

• Projects where your work has real impact on the future of energy.

• Support for growth – trainings, certifications, and internal learning.

• Flexibility to manage your schedule and balance office/remote work.

• A transparent environment where your ideas matter.

If you’re ready to use data to solve meaningful problems in energy and commodities, we’d love to meet you.

Apply now and let’s talk.