Job Description : Microbiologist Runcorn, GUINNESS Beer Packaging Site Full-time – Permanent Closing date 05/01/2026 Join our Beer Manufacturing Team Our Supply Chain and Manufacturing team are problem-solvers, sourcing, producing and delivering our much-loved brands to delight customers around the globe. Over half of Diageo’s 27,000 people work in Supply Chain and Manufacturing. It’s an intricate and sophisticated operation that’s the product of logistical, manufacturing, and technical collaborations. We operate Guinness packaging facilities at Marshalls Road in Belfast, Northern Ireland, and Runcorn, in North West England, producing canned, bottled and kegged product for Ireland, UK and export markets. Significant investment is underway at both of these locations. This role is site based at Runcorn which is an 18 Acre site running a 24/7 Operation with 4 rotational crews. It has 2 Bottling, 2 Canning lines and 1 Kegging production line. There are 90 SKUs with 16 different Beer/Liquid types covering producing on average 23million cases of product per annum About the role This is an excellent opportunity to join Diageo’s team in Runcorn as a Microbiologist, playing a vital role in supporting full compliance with Diageo Way of Brewing Standards, Global Risk Management Standards, and food safety legislation. Working across all areas of the site, you’ll carry out routine and positive-release microbiological analysis whilst providing timely, accurate data to support production and quality decisions. Key responsibilities include: Performing a wide range of microbiological techniques such as aseptic sampling, plating, staining, microscopy, and product testing. Preparing analytical reagents, maintaining laboratory consumable stock levels, participating in microbiological ring schemes, supporting internal and external audits, and engaging with central experts, including weekly micro calls. Supporting the delivery of Quality Sample Plans, contributing to food safety and compliance certifications (FSSC 22000, ISO 9000). Assisting with commercialisation trials and continuous improvement initiatives, while providing cross-skilled support across the wider Quality function where required About you To be successful for this role, you'll have a degree in Microbiology, Food Science, or a related scientific subject supported by relevant laboratory experience. You’ll be able to demonstrate good practical knowledge of classical microbiology techniques while ensuring GMP standards are consistently met. In addition, you’ll have: Strong technical expertise in microbiology, with experience in an analytical, microbiological, or manufacturing environment. Demonstrated analytical capability, accuracy, and attention to detail. Excellent communication and relationship-building skills, with the ability to influence across multiple levels. A background in beverage manufacturing or analysis would be an advantage Working with us Our purpose is to celebrate life, every day, everywhere. And creating an inclusive culture, where everyone feels valued and that they can belong, is a crucial part of this. We embrace diversity in the broadest possible sense. This means that you’ll be welcomed and celebrated for who you are just by being you. You’ll be part of and help build and champion an inclusive culture that celebrates people of different gender, ethnicity, ability, age, sexual orientation, social class, educational backgrounds, experiences, mindsets, and more. Our ambition is to create the best performing, most trusted and respected consumer products companies in the world. Join us and help transform our business as we take our brands to the next level and build new ones as part of shaping the next generation of celebrations for consumers around the world. Feel inspired? Then this may be the opportunity for you! If you require a reasonable adjustment, please ensure that you capture this information when you submit your application. Worker Type : Regular Primary Location: Runcorn Additional Locations : Job Posting Start Date : 2025-12-23