Senior Backend Engineer – AI

About Numan Founded in 2018, we’ve already grown to be a 200+ team distributed across the globe united by a singular mission: empowering people to take control of their health. Numan is transforming health: we’ve built a cutting-edge platform that integrates diagnostics, medication, supplements, digital programmes, and doctor consultations. Giving people the tools they need to maximise life. To deliver on our transformative mission, we are guided by our 5 company values: Patients first. Deliver sustainable results at speed. Own the quality. Succeed together. Care deeply. Backed by top-tier investors, Numan is already having a positive impact on hundreds of thousands of patients here in the UK, and we want you to help us deliver this mission! The Role We are seeking a talented Senior Backend Engineer to join our innovative AI team and help drive the future of digital health through the application of cutting-edge AI/ML solutions. You will work closely with various teams across Product, Clinical, and Engineering, to develop and deploy machine learning models that enhance the quality and effectiveness of our health products and services. You’ll be: Instrumental in designing our AI architecture and building a health platform that helps our patients take better care of themselves. Setting up, fine-tuning, deploying, and scaling machine learning models that drive products and services. Monitoring model performance in real-world applications and iteratively improving based on feedback and new data. Working in the Medical Platform team, designing, implementing, maintaining, scaling and deploying a core part of our business. Hands-on with coding, best practices, appropriate tools and technologies. 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. We’re looking for someone who: 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. Has excellent Python skills and strong experience with frameworks such as Django or Flask. Has strong commercial experience in relational and non-relational databases. Has excellent problem-solving and debugging skills. Cares deeply about system health and maintainability, with a passion for good engineering habits and best practices. Takes initiatives, is able to work independently, and owns all aspects of their work. Has solid communication skills and is able to work in cross-functional teams and collaborate effectively with remote team members. Takes pride in their work and is always looking to improve, not settling for average. Wants to work for a brand with a purpose. Our benefits include... 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. 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. 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. Diversity at Numan At Numan, people are at the heart of who we are. We recognise and value the unique perspectives and experiences that individuals from all backgrounds bring. We promote innovation and creativity, enabling us to tackle things from various viewpoints and are committed to equal opportunities and continuously strive to create a workplace where everyone feels respected, heard, and valued. Embracing diversity isn't just our goal; it's our strength, driving us towards a more inclusive future.

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