Member of Technical Staff - Reasoning

United KingdomLondonlead
OtherMember Of Technical StaffMember Of Technical
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Quick Summary

Key Responsibilities

Build robust and scalable distributed RL systems. Optimise frameworks to enable complex inference-time reasoning. Develop environments and harnesses for agents. BASIC

Requirements Summary

Experienced with large-scale reinforcement learning systems. Designing and implementing distributed systems. Keeping up with state-of-the-art RL and inference time compute algorithms.

Technical Tools
OtherMember Of Technical StaffMember Of Technical

xAI’s mission is to create AI systems that can accurately understand the universe and aid humanity in its pursuit of knowledge. Our team is small, highly motivated, and focused on engineering excellence. This organization is for individuals who appreciate challenging themselves and thrive on curiosity. We operate with a flat organizational structure. All employees are expected to be hands-on and to contribute directly to the company’s mission. Leadership is given to those who show initiative and consistently deliver excellence. Work ethic and strong prioritization skills are important. All employees are expected to have strong communication skills. They should be able to concisely and accurately share knowledge with their teammates.

About the Role

~1 min read

As a Member of Technical Staff, you will build frameworks to improve the reasoning capability, build distributed reinforcement learning systems, techniques for inference time compute (e.g. tree search and planning), and develop environments for agents.

You will get exposure and will be expected to solve and take ownership of components across the entire stack.

Responsibilities

~1 min read
  • Build robust and scalable distributed RL systems.
  • Optimise frameworks to enable complex inference-time reasoning.
  • Develop environments and harnesses for agents.

Requirements

~1 min read
  • Experienced with large-scale reinforcement learning systems.
  • Designing and implementing distributed systems.
  • Keeping up with state-of-the-art RL and inference time compute algorithms.

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. Systems hands-on: Demonstrate practical skills in a live problem-solving session.
  3. Project deep-dive: Present your past exceptional work to a small audience.
  4. Meet and greet with the wider team.

 

xAI is an equal opportunity employer. For details on data processing, view our Recruitment Privacy Notice.

Listing Details

First seen
March 26, 2026
Last seen
April 22, 2026

Posting Health

Days active
27
Repost count
0
Trust Level
29%
Scored at
April 22, 2026

Signal breakdown

freshnesssource trustcontent trustemployer trust
Xai
Xai
greenhouse

Driven by artificial intelligence and human empathy.

Employees
30
Founded
2014
Domain
xai.ma
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XaiMember of Technical Staff - Reasoning