Senior Technical Account Manager (UK)

Mattermost is the leading collaborative workflow platform for defense, intelligence, security, and critical infrastructure. Trusted by the U.S. Department of War and Fortune 500s, our platform runs on-premises and in private clouds, delivering secure messaging, file sharing, workflow automation, audio/screenshare, and project management—all with full data and operational control. Mattermost powers high-stakes workflows across mission planning, real-time, real-world operations, DevSecOps, incident response, and cyber defense—enabling secure collaboration from tactical edge and DDIL environments to enterprise HQ. Teams operate across web, desktop, and mobile, with embedded interoperability for Microsoft Teams, Outlook, and Microsoft 365. To learn more, visit www.mattermost.com Mattermost is seeking a Senior Technical Account Manager (TAM) is a customer-facing technical leader responsible for ensuring the successful deployment, integration, and operational success of the Mattermost platform for enterprise and public sector clients across the United Kingdom. This role requires strong technical expertise in infrastructure, cybersecurity, and DevSecOps , combined with the ability to build trusted relationships with customers across multiple regions and languages. The TAM serves as a trusted technical advisor—partnering with engineering, product, and customer teams to ensure reliable, secure, and scalable deployments of Mattermost. Key Responsibilities Customer Success & Technical Delivery Lead onboarding, deployment, and optimization of Mattermost for strategic enterprise customers. Design and validate scalable architectures for cloud, hybrid, and on-premise deployments . Guide customers on integrating Mattermost with identity providers ( SSO, SAML, OAuth, LDAP ), CI/CD pipelines, and monitoring tools. Support adoption across distributed teams by ensuring high reliability, security, and performance . Provide proactive technical guidance to prevent issues and optimize system architecture. Technical Leadership & Advocacy Serve as the primary technical advisor for assigned customer accounts. Work closely with Product, Engineering, and Support teams to resolve technical challenges. Capture customer insights and feedback to influence product roadmap and feature development. Develop documentation, deployment templates, and automation assets to support customer success at scale. Communication & Stakeholder Management Communicate complex technical concepts clearly to both technical and non-technical audiences. Build trusted relationships with stakeholders across UK Conduct technical workshops, architecture reviews, and implementation planning sessions. Maintain documentation of deployment architectures, customer requirements, and feedback. Required Qualifications 5+ years experience in Technical Account Management, Solutions Engineering, DevOps Engineering, or a similar technical customer-facing role. Strong expertise in Linux, networking, containers (Docker/Kubernetes), and cloud infrastructure . Experience with scripting or development ( Python, Go, Bash, Node.js, or similar ). Familiarity with DevOps and CI/CD tools (GitHub/GitLab, Jenkins, Terraform, Jira). Strong understanding of cybersecurity best practices and secure system design . Proven ability to manage enterprise technical relationships and complex implementations. Applicants must meet eligibility requirements for access to export-controlled information as defined by U.S. export control laws, including EAR and ITAR. Fluent English (written and spoken) required. Excellent communication and stakeholder management skills. Must be authorized to work in the United Kingdom . Preferred Qualifications Experience supporting public sector, defense, or regulated industries . Familiarity with compliance frameworks such as ISO 27001, SOC 2, GDPR, NIS2, or UK NCSC security guidance . Experience supporting air-gapped or highly secure deployments . Existing or eligibility for security clearance