Companies that use Mattermost

Source: Analysis of job postings that mention Mattermost (using the Bloomberry Jobs API)

My analysis shows that Mattermost purchasing decisions primarily sit with IT infrastructure and operations leaders, with system administrators representing 19% of job postings, followed by DevOps engineers at 11% and backend engineers at 9%. The buyers are typically IT directors, heads of infrastructure, and cybersecurity leaders who prioritize secure communication for defense, intelligence, and critical infrastructure organizations. Multiple postings emphasize requirements for security clearances and compliance frameworks like CMMC Level 2, NIST 800-171, and DoD DevSecOps standards, revealing that Mattermost buyers are operating in highly regulated, security-sensitive environments.

The day-to-day users span a broad range of technical practitioners. System administrators manage Mattermost alongside collaboration stacks including Nextcloud, GitLab, and monitoring tools. DevOps teams integrate it into CI/CD pipelines with Jenkins, Ansible, and Kubernetes environments. Software engineers use it for real-time team coordination during development sprints. One posting describes supporting "global communication and mission readiness" with Mattermost enabling "real-time collaboration for U.S. defense teams worldwide," highlighting its role in mission-critical operations.

The core pain point centers on secure, self-hosted communication that meets strict compliance requirements. Companies seek "secure, efficient operations for the world's most critical teams" and need tools that work in "air-gapped" or restricted environments. Multiple postings reference supporting "complex cyber activities" and "critical infrastructure" where commercial cloud services cannot be used. Organizations are building "resilient, secure, and auditable solutions" where data sovereignty and operational security trump convenience.

Source: Analysis of Linkedin bios of 1,035 companies that use Mattermost

I noticed that Mattermost users span an incredibly diverse range of industries, but they share a common thread: they build or operate technical systems that require serious collaboration. These aren't consumer-facing social media companies. They're software development shops (like 2Coders Studio, Appfactory), IT consultancies (3Engineers, ASD Team), engineering firms working on infrastructure (A. Eberle with power grids, Applied Software Engineering with rail safety), government agencies (Vice-rectorat de la Nouvelle-Calédonie, Ministry of Justice Uzbekistan), and industrial operations (Almalyk Mining, JSC Avangard). Many are creating custom software solutions for other businesses or managing complex technical operations.

These are predominantly small to mid-sized technical organizations. The employee counts cluster heavily in the 11-50 range, with many in the 51-200 bracket. Very few show venture funding, which signals they're profitable service businesses or bootstrapped product companies rather than venture-backed startups chasing hypergrowth. They've been around long enough to develop expertise (many mention 10-20 years of experience) but remain lean and specialized.

Source: Analysis of tech stacks from 1,035 companies that use Mattermost

I noticed that Mattermost users are overwhelmingly self-hosted, infrastructure-focused companies that prioritize control over their development and deployment environments. The extreme correlation with GitLab (129.7x more likely), combined with self-hosting infrastructure tools like Hetzner and Portainer, tells me these are engineering-driven organizations that want to own their entire stack rather than rely on SaaS vendors. They're likely mid-market tech companies or IT departments within larger enterprises that value data sovereignty and customization.

The pairing of GitLab, GitLab CI, and Mattermost makes perfect sense as an open-source DevOps trinity. These companies are running their own Git repositories, CI/CD pipelines, and team communications all on infrastructure they control. The presence of N8N (a self-hosted workflow automation tool) reinforces this pattern. They're not using Zapier or other cloud automation, they're building everything in-house. Portainer's high correlation suggests they're managing containerized deployments, probably running Mattermost and these other tools in Docker environments.

The full stack screams product-led, engineering-first organizations. These aren't companies with large sales or marketing teams buying enterprise SaaS bundles. They're technical teams who evaluate tools themselves, prefer open-source options, and have the capability to self-host. The presence of Jira Data Center (not Cloud) confirms they're at a stage where they need enterprise features but still want on-premise deployment. I'd estimate these are growth-stage companies with 50-500 employees, or specific technical divisions within larger corporations.