Senior ML Engineer

Jit Team; Kraków; Hybrid; PLN 1,300 - 2,000; Full time

Job summary

Jit Team Kraków is seeking a skilled ML Engineer to join a team developing and maintaining advanced ML solutions used to support key business processes in a rapidly growing Polish logistics and fintech context.

You will work with Python, scikit-learn and PyTorch or TensorFlow, develop and deploy production-grade models, manage the ML lifecycle from data prep to monitoring, and collaborate with cross-functional teams across offices in Poland and Krakow.

Qualifications

• Strong experience with Python and ML model development.
• Hands-on with scikit-learn and at least one deep learning framework (PyTorch or TensorFlow).
• Solid knowledge of SQL and data processing at scale.
• Experience working with Spark and/or Databricks.
• Practical knowledge of MLflow and the ML model lifecycle.
• Experience building production-grade ML solutions.
• Good understanding of model explainability techniques (SHAP, LIME).
• Experience with model monitoring and validation metrics (PSI, Gini, KS).

Responsibilities

• Develop and maintain ML solutions at scale.
• Cover the ML lifecycle from data preparation to deployment and monitoring.
• Monitor and optimize production models and dashboards.
• Collaborate with cross-functional teams and stakeholders.

Skills

Python & ML development

ML model development

scikit-learn

PyTorch

TensorFlow

SQL

Spark

Databricks

MLflow

SHAP

LIME

PSI

Gini

KS

Tools

Databricks

Spark

PyTorch

TensorFlow

scikit-learn

MLFlow

SQL

Job description

Salary: 120 - 180 PLN net + VAT/md

Remote: 1 day/month from the office (Warsaw, Krakow, Tricity)

Why choose this offer?

• You can expect a flexible work organization
• You will work for one of Poland's leading organizations in the logistics and e-commerce industry
• The international work environment will give you the opportunity to work with leading experts from different teams and areas
• Your software will be used by millions of users, giving you the chance to make a real impact
• The Jit Community will bring you a nice time during regular integration meetings

Project

You will join a team responsible for developing and maintaining advanced Machine Learning solutions used at scale to support key business processes. The project covers the entire ML lifecycle, from data preparation and model development through deployment, monitoring, and continuous optimization in production environments.

Expected competences and knowledge

• Strong commercial experience with Python and Machine Learning model development
• Hands-on experience with scikit-learn and at least one deep learning framework (PyTorch or TensorFlow)
• Solid knowledge of SQL and data processing at scaleExperience working with Spark and/or Databricks
• Practical knowledge of MLflow and the ML model lifecycle
• Experience building and maintaining production-grade ML solutions
• Good understanding of model explainability techniques (SHAP, LIME)
• Experience with model monitoring and validation metrics (PSI, Gini, KS)

Technologies you'll work with

• Python
• Databricks
• Spark
• PyTorch/TensorFlow
• scikit-learn
• MLFlow
• SQL

Client - why choose this particular client from the Jit portfolio?

This is an opportunity to join a well-established and rapidly growing Polish business and contribute to the development of a new fintech initiative from its early stages. The project combines the scale and stability of a large organization with the pace, autonomy and technical challenges of building a new business area. You'll have a chance to work on solutions that directly support payments and financial products, using a modern technology stack and working alongside experienced technology teams.

About Jit Team

The Human Factor of IT

it's not just a slogan, it's a philosophy. The foundation of Jit Team is people, which is why we prioritise you. We employ over 770 experienced experts, to whom we offer developmental projects, a wide range of benefits, and a proprietary professional development programme. Together with clients from around the world, we create innovative IT solutions delivered by highly specialised and efficient teams.

Behind our maxim are also charitable and educational activities. We support schools, universities, and educational institutions by conducting workshops, running educational projects, sponsoring events, and donating learning equipment. We offer internships that help launch careers in IT. We support water rescuers and hospitals by providing the necessary equipment. We also support numerous charitable organisations helping people in need, children, and the elderly. We are a Polish company and we share what we have achieved over more than 15 years of activity. By supporting local initiatives, we contribute to the circulation of good energy.