Mattermost is the secure, sovereign collaboration platform built for mission-critical and cyber resilient operations. Trusted by government, defence, intelligence, and critical infrastructure teams, it powers high-stakes workflows, from incident response and threat coordination to mission planning, across DDIL, tactical, and enterprise environments. With on-prem and private cloud deployment, workflow automation, and AI-accelerated capabilities, Mattermost delivers full operational control, improved cyber resilience, and reduced mean time to action in even the most demanding conditions.