AI Engineer & Researcher - Post-Training

About litwoo

Welcome to litwoo FlexCo!


Experience is secondary - what counts are passion and perseverance!


Our team is small, highly motivated, and focused on engineering excellence. Litwoo is suitable for employees who challenge themselves and are driven by curiosity. Independence, team spirit, high tolerance for mistakes, and an absolute focus on achieving goals characterize our company.


We operate with a flat organizational structure. All employees are expected to be hands-on and contribute directly to the achievement of company goals. Leadership is given to those who show initiative and consistently deliver excellent results. Work ethic and strong prioritization skills are important.

All engineers and researchers should have strong communication skills. They should be able to share knowledge concisely and accurately with their teammates.


Every application is reviewed directly by a technical member of the team.

Tech Stack

  • Python
  • JAX
  • Rust


The role is based in the Upper Austrian Area [Linz]. Alternatively, remote work will also be offered. However, candidates are expected to relocate to Linz within a year (starting from 2025, San Francisco (USA) is also an option).


  • Designing and implementing evaluations for new capabilities.
  • Creating new and enhancing existing human and synthetic data generation methods and pipelines.
  • Experimenting with novel fine-tuning and reinforcement learning techniques.
  • Optimizing training data quality and data mixture to improve evaluation metrics.
  • Innovating new ideas that bring us closer to our goal.

Ideal Experiences

  • Expert in ML and fine-tuning large language models.
  • Experience in developing and managing large-scale machine learning systems.
  • Experience in connecting machine learning model behavior to data distribution and data quality.
  • Familiar with the latest prompting and inference-time search techniques.

Interview Process

After submitting your application, the team reviews your CV and statement of exceptional work. If your application passes this stage, you will be invited to a 15 minute interview (“phone interview”) during which a member of our team will ask some basic questions. If you clear the initial phone interview, you will enter the main process, which consists of four technical interviews:


1. Coding assessment in a language of your choice.

2. Post-Training Technical Session (2): This session will be testing your ability to formulate, design and solve concrete problems in post-training. It can be research or engineering, depending on background/experience. 

3. Meet the Team: Present your past exceptional work and your vision with xAI to a small audience.


Our goal is to finish the main process within one week. We don’t rely on recruiters for assessments. Every application is reviewed by a member of our technical team. All interviews will be conducted via Google Meet.

Annual Salary

The annual salary will be negotiated in a personal interview.

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