A GTM team manages Google Tag Manager across an organization's digital properties. Their core job is deploying, testing, and maintaining marketing and analytics tags—Facebook Pixel, Google Analytics 4, LinkedIn Insight, heat mapping tools—without having developers push code every time marketing needs a new conversion tracked. Typically this team includes a GTM lead or specialist, sometimes a developer who understands JavaScript and data layer architecture, and stakeholders from marketing and analytics who define what events matter. In smaller setups like many of our clients, it's one person wearing multiple hats. In enterprise environments, you might have dedicated tag governance roles, QA processes, and formal change management. Key responsibilities include building triggers and variables, structuring the data layer so tags fire correctly, debugging tag conflicts, and auditing container versions to avoid bloat. A solid GTM team also enforces naming conventions and documentation so you're not stuck reverse-engineering what "Trigger 47" does six months later. At Ottawa SEO, we treat GTM setup as foundational infrastructure. We configure GA4 events, set up Enhanced Ecommerce or lead tracking, and hand clients a clean container with notes. We've seen teams running 80+ tags with zero documentation—it becomes technical debt fast. The goal is a system where marketers can add a tag in ten minutes, test it in Preview mode, and ship it confidently. Common pitfalls: letting too many people publish without review, ignoring consent mode requirements under PIPEDA or GDPR, and treating GTM like a dumping ground. A good GTM team enforces version control, keeps containers lean, and periodically audits what's firing. If your team is just piling tags in without testing or governance, you're not managing GTM—you're creating a tracking liability.