AI Researcher — Training Optimization

Featherless AI; Poland; On-site; PLN 80,000 - 110,000; Full time

Job summary

A leading AI research team in Poland is seeking an AI Researcher focused on training optimization. You will design and evaluate optimization techniques for large models, improve training efficiency, and collaborate with infrastructure teams. The ideal candidate has a strong background in machine learning research, experience with large neural networks, and publication experience in noted ML venues. This role offers significant influence over core model training decisions and the freedom to innovate in a dynamic environment.

Qualifications

• Strong background in machine learning research with emphasis on training dynamics.
• Publication experience in high-quality ML venues.
• Proficiency in Python and modern ML frameworks.

Responsibilities

• Design and evaluate training optimization techniques.
• Improve training efficiency and stability across long runs.
• Run large-scale experiments and analyze results.

Skills

Machine learning research

Training dynamics and optimization

Python

Large neural networks

Data analysis

Tools

PyTorch

Job description

About the Role

We’re looking for an AI Researcher focused on training optimization to help us push the efficiency, stability, and scalability of large-scale model training. You’ll work at the intersection of research and systems, developing novel techniques to reduce training cost, accelerate convergence, and improve model quality—while validating ideas through rigorous experiments and publications.

This role is ideal for someone who enjoys turning research insights into practical training wins, and who has a track record (or strong ambition) of publishing applied ML research.

What You’ll Work On

• Design and evaluate training optimization techniques for large models (e.g. optimization algorithms, schedulers, normalization, curriculum strategies)
• Improve training efficiency and stability across long runs and large datasets
• Research and implement methods such as:
  • Optimizer and scheduler innovations
  • Mixed-precision, low-precision, and memory-efficient training
  • Gradient noise reduction, scaling laws, and convergence analysis
  • Training-time regularization and robustness techniques
• Run large-scale experiments, analyze results, and translate findings into actionable improvements
• Author or co-author research papers, technical reports, or blog posts
• Collaborate closely with infrastructure and inference teams to ensure training decisions translate to real-world performance

What We’re Looking For

• Strong background in machine learning research, with emphasis on training dynamics and optimization
• Experience training large neural networks (LLMs, multimodal models, or large sequence models)
• Publication experience in ML venues (e.g. NeurIPS, ICML, ICLR, ACL, EMNLP, COLM, arXiv) or equivalent high-quality open research
• Solid understanding of:
  • Optimization theory and practice
  • Backpropagation, gradient flow, and training stability
  • Distributed and large-batch training
• Proficiency in Python and modern ML frameworks (PyTorch preferred)
• Ability to independently design experiments and reason from data

Nice to Have

• Experience with non-standard architectures (e.g. RNN variants, long-context models, hybrid systems)
• Experience optimizing training on GPUs at scale (FSDP, ZeRO, custom kernels)
• Contributions to open-source ML or research codebases
• Comfort operating in fast-moving, ambiguous startup environments

Why This Role

• Real influence over core model training decisions
• Freedom to pursue and publish novel research
• Direct access to large-scale experiments and real production constraints
• A small, senior team that values thinking deeply and shipping thoughtfully