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 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.