Senior Backend Engineer - AI

Summary

Join Numan's innovative AI team as a Senior Backend AI Engineer to drive the future of digital health. You will design AI architecture, build a health platform, fine-tune and deploy LLMs and ML models, develop RAG pipelines, and build backend systems. The role involves monitoring model performance, improving systems based on feedback, mentoring colleagues, and collaborating with various teams. You will be instrumental in creating products with a positive impact on people's lives. This position requires expertise in backend engineering, LLM deployment and management, RAG, and API development. Numan offers a comprehensive benefits package.

Requirements

• Wants to build products that can truly have a fundamental positive impact on people's lives
• Is a strong backend engineer with experience in designing and developing large-scale applications and designing end-to-end infrastructure
• Demonstrates expert-level understanding of deploying and managing Large Language Models (LLMs), including setting up, fine-tuning, and scaling these models to support real-world applications
• Is highly knowledgeable in technologies such as Retrieval-Augmented Generation (RAG)
• Has substantial experience building, optimising, and maintaining APIs specifically designed for AI functionalities, including a scalable AI model inference with robust error handling and security measures

Responsibilities

• Instrumental in designing our AI architecture and building a health platform that helps our patients take better care of themselves
• Fine-tuning, evaluating, deploying, and scaling LLMs (e.g. GPT, LLaMA, Claude) and ML models in production-grade environments
• Developing Retrieval-Augmented Generation (RAG) pipelines, embeddings infrastructure, and prompt engineering strategies
• Monitoring model performance in real-world applications and iteratively improving based on feedback and new data
• Building and maintaining backend systems and APIs to serve LLM responses efficiently, reliably, and securely
• Mentoring, helping and guiding less experienced colleagues to grow as engineers
• Working with people from various business functions in clarifying requirements and suggesting different and relevant technical approaches

Benefits

• Share options
• 25 days holiday, plus bank holidays (increasing to 30 the longer you stay with Numan)
• Health insurance with Vitality
• Enhanced maternity and parental leave
• Nursery benefit provided by YellowNest
• Employee assistance programme (access to therapy, financial planning and discounts)
• Generous pension (includes both employee and employer contributions)
• Flexible working options, including a dog friendly office in Farringdon
• Personal training and development budget via Learnerbly
• Wellhub membership, giving you access to over 2,000 locations in the UK
• Free office snacks including breakfast items, soft drinks, tea and coffee
• Cycle to work scheme
• Season ticket loan
• Discount to Numan products for your friends and family
• Paid volunteering days
• An additional 2 weeks off once you reach your 5th anniversary with Numan