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6,000 AWS Accounts, Three People, One Platform: Lessons Learned

ProGlove runs a SaaS platform on AWS using an account-per-tenant architecture, currently operating about 6,000 tenant accounts—half active—with over 120,000 service instances and a million Lambda functions. The approach gives each customer isolated compute, storage, and IAM boundaries, simplifying security, debugging, and per‑tenant cost attribution. To make this feasible, the team relies heavily on automation tools such as AWS Organizations, Service Control Policies, CloudFormation StackSets, and Step Functions, while centralizing observability through tagging and cross‑account monitoring. Despite the operational shift, the model lets a three‑person ops team scale without proportional headcount growth.