Maths and Cryptography Roles - GCHQ

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A maths career that counts for more.

As one of Britain’s intelligence agencies, we unlock the complex world of communications to keep our nation safe. Collaborating closely with the intelligence community, we safeguard Britain’s people, interests and businesses from various threats. Think cyber-attacks, espionage, and serious organised crime. It’s varied and meaningful work that you simply won’t find anywhere else.

You’ll work closely with and be supported by fellow team members, and soon find yourself applying mathematical thinking to protect the UK. It really is a role like no other. Specialising in maths and cryptography, you’ll use your skills to tackle unique, complex and ever-changing problems.

From algebra and probability to number theory, statistics and optimisation, you’ll work across fascinating areas like cryptography, cryptanalysis, network exploitation, cyber security, data science, machine learning and mathematical modelling. Plus, you’ll be using some of Europe’s most powerful computers to impact on critical knowledge and key decisions.

With a background in maths, computer science or a similar subject with substantial mathematical content, you’ll bring plenty of curiosity and a relevant 2:2 degree level qualification. You’ll love solving problems, while juggling competing demands and fluently adapting to new circumstances. You’ll be passionate about technology – and might even have some experience in programming, although that’s not essential.

At GCHQ, diversity and inclusion are critical to our mission. To protect the UK, we need a truly diverse workforce that reflects the society we serve. This includes diversity in every sense of the word: those with different backgrounds, ethnicities, gender identities, sexual orientations, ways of thinking and those with disabilities or neurodiverse conditions. We therefore welcome and encourage applications from everyone, including those from groups that are under-represented in our workforce.

To be eligible to apply, you must be a British Citizen. One of your parents must be a British Citizen or must have the nationality or citizenship from our approved list of countries (further information on our eligibility criteria can be found here If you hold dual nationality, of which one component is British, you will nonetheless be considered. Candidates must normally have been resident in the UK for seven out of the last ten years. This is particularly important if you were born outside the UK. You can apply at the age of 17 years and 6 months, if successful you will not be offered a start date prior to your 18th birthday. Discretion is vital. You should not discuss your application, other than with your partner or a close family member. Please note, you should only launch your application from within the UK. If you are based overseas, you should wait until you visit the UK to launch an application. Applying from outside of the UK will impact on our ability to progress your application. Further information on our eligibility criteria can be found on the Applying section.



GCHQ - the Government Communications Headquarters - works in association with MI5 and MI6 to make up the UK's National Intelligence Machinery.

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