Senior ML & LLM Systems Engineer: Scale Enterprise AI

Sii Poland; Poznań; On-site; PLN 240,000 - 360,000; Full time

Benefits offered by this job

Great place to work

Profit sharing

Medical care

Internal trainings

Open management

Job summary

Sii Poland is seeking a Senior Machine Learning / LLM Systems Engineer to join our AI platform team in Poland. You will scale and optimize large-scale ML and LLM systems for international clients, collaborating with cross-functional teams on strategic AI initiatives.

The role emphasizes performance engineering, distributed training and inference, and a hands-on approach with C++, CUDA, and Python to push efficiency and reliability across deployments.

Qualifications

• Minimum 5 years of experience with LLM models and ML workloads.
• Hands-on work with large-scale distributed ML systems.
• Low-level optimization skills in C++, CUDA, or similar technologies.
• Strong Python skills with an understanding of system-level performance.
• Very good English skills, both spoken and written.

Responsibilities

• Scale ML and LLM models across multi-node clusters.
• Optimize latency, throughput, and resource efficiency of ML workloads.
• Design and operate distributed training and inference systems.
• Benchmark and profile AI workloads on real hardware platforms.
• Identify and resolve system-level performance bottlenecks.

Skills

LLM models

Distributed ML

C++

CUDA

Python

English

Production ML

Job description

Sii Poland is seeking a Senior Machine Learning / LLM Systems Engineer to join our AI platform team in Poland. You will scale and optimize large-scale ML and LLM systems for international clients, collaborating with cross-functional teams on strategic AI initiatives.

The role emphasizes performance engineering, distributed training and inference, and a hands-on approach with C++, CUDA, and Python to push efficiency and reliability across deployments.