I have worked as a supervisor and tutor/demonstrator at Warwick and Glasgow respectively. I was a student access officer at Cambridge, and am passionate about maths communication and outreach.
One great organisation working in this space is Maths Beyond Limits. This is an annual mathematical camp held in Poland for enthusiastic and talented high school students, with an emphasis on learning maths for fun, in a friendly and safe environment. I have worked as a tutor at MBL 2022-2024, as well as the sister camps MBL Balkans 2023-2025.
Here is the general website. Applications for MBL 2025 are open! Here is the participant application page, and here is the tutor application page. I highly recommend getting involved - it's a wonderful community.
Please get in contact with me if you would like more information about MBL (or any other outreach activities).