The Security Service (MI5) is responsible for protecting the United Kingdom against threats to national security. This website provides information about the Security Service, the threats it counters, links to sources of security advice and details of careers with the Service.

Various positions available, see below

Audio Specialist
Business Analysts
Business Continuity Manager
Business Relationship Managers
Data and Information Professionals
Fire Safety Officer
Foreign Language Analysts - Pakistani Pashto
Forensic Speech & Language Specialist
Intelligence Analyst
Intelligence Officer
Internet Investigation, Exploitation and Cyber Security Specialists
IT Service Management
Mandarin Intelligence Analysts
Project, Programme and Portfolio Managers
Russian Intelligence Analyst
Somali Language Analysts
Speech Analyst
Speech Technician
Strategy, Architecture, IT Security and Testing Specialists

Apply here https://www.mi5.gov.uk/careers/current-jobs.aspx