Senior LLM Specialist - End-to-End ML Training

TechBiz Global GmbH; Kraków; On-site; PLN 180,000 - 240,000; Full time

Job summary

TechBiz Global GmbH in Kraków is seeking a Senior Data Scientist to lead end-to-end AI model training, from data prep to deployment, with hands-on experience in LLMs/SLMs and GPU infrastructure.

The ideal candidate will demonstrate strong Python skills, experience with major ML frameworks, and the ability to explain technical decisions clearly. Based in Poland, you will collaborate with cross-functional teams to productionize models.

Qualifications

• Proven professional experience as a Data Scientist, ML Engineer, AI Engineer, or similar role.
• Hands-on experience training or fine-tuning LLMs and/or SLMs.
• Experience using GPUs for AI model training.
• Strong Python programming skills.
• Experience with PyTorch, TensorFlow, Hugging Face Transformers.
• Experience with CUDA, distributed training, cloud GPU platforms, or GPU clusters.
• Strong understanding of model-training workflows, including data preparation, tokenisation, model selection, training, evaluation, and optimisation.
• Ability to clearly explain previous AI projects, tools used, technical challenges, and achieved results.
• Experience working with large and complex datasets.
• Good English communication skills.
• Based in Poland.

Responsibilities

• Train, fine-tune, and optimise LLMs and SLMs using GPU infrastructure.
• Build and manage end-to-end machine learning training pipelines.
• Prepare, clean, structure, and process large volumes of real-world data.
• Select appropriate models, frameworks, tools, and training approaches based on project requirements.
• Apply techniques such as supervised fine-tuning, transfer learning, prompt tuning, and parameter-efficient fine-tuning.
• Monitor model performance and improve accuracy, speed, scalability, and resource utilisation.
• Work with structured, unstructured, time-series, telemetry, log, and streaming data.
• Clearly document and explain the tools, methods, and technical decisions used throughout the model-training process.
• Collaborate with engineering, data, and business teams to move models from experimentation into production.
• Troubleshoot issues related to model quality, training stability, GPU performance, and data pipelines.

Skills

Data Scientist experience

Python programming

LLMs/SLMs training

GPU-based training

Model training workflows

English communication

Tools

Docker

Kubernetes

MLflow

Cloud platforms (AWS/GCP/Azure)

Job description

TechBiz Global GmbH in Kraków is seeking a Senior Data Scientist to lead end-to-end AI model training, from data prep to deployment, with hands-on experience in LLMs/SLMs and GPU infrastructure.

The ideal candidate will demonstrate strong Python skills, experience with major ML frameworks, and the ability to explain technical decisions clearly. Based in Poland, you will collaborate with cross-functional teams to productionize models.