LLM Engineer

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

Ultralytics office

in Madrid, ES. Applicants must have legal authorization to work in the Spain, 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.