Machine Learning Engineer (Senior/Expert)

Jit Team; Gdynia; Hybrid; PLN 221,400 - 339,480; Full time

Job summary

Jit Team in Poland is seeking an experienced Senior Machine Learning Engineer to join a global product team. You will design, build and deploy scalable ML systems, collaborate with researchers, software engineers and product managers, and own parts of the ML lifecycle from data curation to production monitoring.

The role offers a hybrid work model with 3 days per week in the Malmö office; during the first 3 months commuting is possible and travel costs are covered.

Qualifications

• 5+ years of commercial experience in Machine Learning Engineering or Software Engineering with a strong ML focus.
• Strong software development skills with proficiency in Python and hands-on experience with deep learning toolkits like PyTorch, TensorFlow, or JAX.
• Experience building scalable, distributed systems and high-throughput applications.
• Hands-on experience developing, deploying and maintaining machine learning models in production environments.
• Experience building data processing pipelines and large-scale ML systems.
• Knowledge of Big Data technologies such as Spark, SQL, Snowflake or Hadoop.
• Excellent written and verbal communication skills in English.
• Ability to collaborate effectively within international, cross-functional teams.

Responsibilities

• Designing, developing and deploying scalable, production-ready machine learning solutions.
• Building and maintaining large-scale ML systems and data processing pipelines.
• Collaborating with engineers, researchers, data scientists and product stakeholders to deliver AI-powered features.
• Improving machine learning infrastructure, tooling and model development workflows.
• Developing and optimizing training, fine-tuning and evaluation processes for machine learning models.
• Supporting the deployment, monitoring and continuous improvement of ML models in production environments.

Skills

Python

PyTorch

TensorFlow

JAX

Spark

SQL

Snowflake

Hadoop

NLP

Generative AI

MLOps

English

Tools

PyTorch

TensorFlow

JAX

Apache Spark

SQL

Snowflake

Hadoop

Job description

Salary: Senior 1200-1400 PLN/MD (B2B) | Expert 1400-1840 PLN/MD (B2B)

Work model: Hybrid (3 days/week from the office in Malmö, Sweden). During the first 3 months, commuting is possible, and travel costs will be covered as business travel expenses. Relocation to Malmö will be required afterwards.

Why choose this offer?

• Opportunity to work on globally used web and developer platforms
• Direct impact on frontend architecture, APIs, and developer-facing solutions
• Collaboration with international, cross-functional engineering and product teams
• Work on large-scale mapping and location-based technologies used worldwide

Project

We are looking for an experienced Senior Machine Learning Engineer to join a team responsible for building and deploying advanced machine learning solutions used at scale. You will work closely with researchers, software engineers, data scientists, analysts, and product teams to develop innovative ML-powered products and services. The role combines hands‑on machine learning engineering with software development and system design. You will contribute to the full machine learning lifecycle, from data curation and model development to deployment, monitoring, and continuous optimization. Working in a multidisciplinary and international environment, you will help shape the future of AI‑driven solutions while contributing to the evolution of machine learning infrastructure and tooling.

What You Will Be Doing

• Designing, developing and deploying scalable, production‑ready machine learning solutions
• Building and maintaining large-scale ML systems and data processing pipelines
• Collaborating with engineers, researchers, data scientists and product stakeholders to deliver AI‑powered features
• Improving machine learning infrastructure, tooling and model development workflows
• Developing and optimizing training, fine‑tuning and evaluation processes for machine learning models
• Supporting the deployment, monitoring and continuous improvement of ML models in production environments

Expected Knowledge And Skills

• 5+ years of commercial experience in Machine Learning Engineering or Software Engineering with a strong ML focus
• Strong software development skills with proficiency in Python and hands‑on experience working with deep learning toolkits like PyTorch, TensorFlow, or JAX.
• Experience building scalable, distributed systems and high‑throughput applications
• Hands‑on experience developing, deploying and maintaining machine learning models in production environments
• Experience building data processing pipelines and large-scale ML systems
• Knowledge of Big Data technologies such as Spark, SQL, Snowflake or Hadoop
• Excellent written and verbal communication skills in English
• Ability to collaborate effectively within international, cross‑functional teams

Preferred Qualifications

• Experience with Natural Language Processing (NLP), Generative AI, RAG systems, foundation models or transformer architectures
• Experience with recommendation systems, personalization, search or advertising technologies
• Familiarity with reinforcement learning, probabilistic models, bandits or other advanced ML techniques
• Proven track record of successfully shipping AI/ML features into large‑scale, real‑world consumer products

Technologies you'll work with

• Python
• Machine Learning & AI
• PyTorch
• TensorFlow / JAX
• Apache Spark
• SQL
• Snowflake / Hadoop
• Data Processing Pipelines
• Generative AI & NLP
• MLOps & Model Deployment

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

Our client is a global technology company known for building innovative digital products and delivering exceptional user experiences at scale. The organization creates solutions used daily by millions of users around the world and invests heavily in engineering excellence, product innovation, and modern technologies. This project offers the opportunity to work on highly impactful developer‑facing platforms while collaborating with experienced international teams. It is an ideal environment for engineers who enjoy solving complex technical challenges and contributing to products with global reach.

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 specialist 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.