LLM Engineer

Job description

Who We Are

At

Ultralytics

, we relentlessly drive innovation in AI, building the world's leading

YOLO models

. We're looking for passionate individuals obsessed with AI, eager to make a global impact, and ready to excel in a dynamic, high-energy environment. Join

our team

and help shape the future of

Vision AI

.

Location and Legalities

This full-time LLM Engineer position is based onsite in our brand-new

Ultralytics office

in London, UK. Applicants must have legal authorization to work in the UK, as Ultralytics does not provide visa sponsorship.

What You'll Do

As an LLM Engineer at Ultralytics, you will spearhead the development and integration of advanced language model capabilities across our ecosystem. You will work on cutting-edge projects that merge the power of

Large Language Models (LLMs)

with our state-of-the-art

computer vision

technologies. Key responsibilities include:

• Developing and scaling robust LLM-powered applications using a variety of APIs, including

  OpenAI

  ,

  Anthropic

  , and

  Gemini

  .
• Implementing and managing multi-API workflows using tools like

  LiteLLM

  to ensure flexibility and resilience.
• Building sophisticated

  Retrieval-Augmented Generation (RAG)

  systems, leveraging advanced techniques like embeddings with

  Voyage AI

  , rerankers, and query enrichment.
• Designing and maintaining efficient data pipelines and vector storage solutions using

  MongoDB

  Atlas Vector Search.
• Fine-tuning LLMs on custom datasets to enhance performance for specialized tasks related to our

  documentation

  and user support.
• Collaborating with our

  YOLO

  development team to explore and build innovative

  multi-modal solutions

  .
• Automating deployment and testing processes using

  CI/CD pipelines

  with

  GitHub Actions

  .

Your work will directly enhance the

Ultralytics HUB

platform and empower our global community of developers and researchers.

Skills and Experience

• 5+ years of experience in software engineering, with a strong focus on AI and

  Machine Learning (ML)

  .
• Expert-level proficiency in

  Python

  and deep learning frameworks, particularly

  PyTorch

  .
• Proven experience building and deploying applications with LLM APIs such as OpenAI, Anthropic, Gemini, and DeepSeek.
• Hands-on experience with the full RAG pipeline, including vector embeddings, rerankers, and data indexing in databases like

  MongoDB

  .
• Practical knowledge of

  LLM fine-tuning

  , prompt engineering, and performance optimization.
• Familiarity with MLOps principles and tools, including CI/CD with GitHub Actions.
• A strong interest in

  computer vision

  and an understanding of object detection models like

  Ultralytics YOLO11

  is a significant plus.
• Excellent problem-solving skills and the ability to perform in a fast-paced, high-intensity environment.

Cultural Fit - Intensity Required

Ultralytics is a high-performance environment for world-class talent obsessed with achieving extraordinary results. We operate at a relentless pace, demanding exceptional dedication and an unwavering commitment to excellence, guided by our

mission, vision, and values

. Our

team

thrives on audacious goals and absolute ownership. This is not a conventional workplace. If your priority is predictable comfort or a standard work-life balance over the relentless pursuit of progress, Ultralytics is not for you. We seek driven individuals prepared for the profound personal investment required to make a defining contribution to the future of AI.

Compensation and Benefits

• Competitive Salary: Highly competitive based on experience.
• Startup Equity: Participate directly in our company's growth and success.
• Hybrid Flexibility: 3 days per week in our brand-new office - 2 days remote.
• Generous Time Off: 24 days vacation, your birthday off, plus local holidays.
• Flexible Hours: Tailor your working hours to suit your productivity.
• Tech: Engage with cutting-edge

  AI projects

  and contribute to leading

  open-source

  software.
• Gear: Brand-new Apple MacBook and Apple Display provided.
• Team: Become part of a supportive and passionate

  team environment

  .

If you are driven to redefine the capabilities of machine learning and eager to make a significant impact,

Ultralytics

offers an exceptional career opportunity.

Extra information

Status

Open

Education Level

Secondary School

Location

London Area

Type of Contract

Full-time jobs

Published at

05-03-2026

Full UK/EU driving license preferred

No

Car Preferred

No

Must be eligible to work in the EU

No

Cover Letter Required

No

Languages

English