Data Lake Terraform Module Library
Standardizing security and compliance across a telecommunications data platform
Overview
A telecommunications equipment and networking provider had every team defining its own Lambda, S3 and Glue resources independently, with no organization-wide standard. Each team's implementation had to be reviewed for security and reliability on its own, and a misconfiguration or an outdated pattern in one team's setup had no way of being caught by anyone else's fix. The engagement built a shared Terraform module library covering the organization's core data lake resources, so security and reliability standards are enforced once, centrally, instead of repeated and re-reviewed by every team independently.
Problems
Every team defined its own Lambda, S3 and Glue resources independently, so the same class of resource was reviewed and secured N separate times instead of once
A misconfiguration or outdated security pattern in one team's implementation had no way of being caught or fixed by a change made elsewhere
Security and compliance review had to be repeated for every team's independent implementation, rather than validated once against a shared standard
No central ownership meant improvements didn't propagate, so known fixes stayed isolated to whichever team happened to apply them
Goals
Replace duplicated, independently reviewed resource definitions with a single, centrally maintained standard
Ensure a security or compliance fix made once applies to every team using the module, not just the team that found it
Reduce the security review burden from N implementations to one shared, audited standard
Make secure defaults the automatic outcome of using the module, not something each team has to get right on its own
What Was Done
Replaced independently defined, independently reviewed Lambda, S3 and Glue resources with one centrally maintained standard
Established a model where a single fix or hardening improvement updates every team's infrastructure at once
Reduced the organization's security review surface for these resource types from N implementations to one
Results and Impact
Security and compliance review effort for these resource types dropped from reviewing every team's implementation separately to reviewing one shared standard
A vulnerability or misconfiguration fixed once in the module is fixed everywhere it's used, closing the gap where one team's fix never reached another team's copy
Least-privilege IAM and encryption at rest are now guaranteed by using the module, not dependent on each team getting it right independently
The organization has a single, auditable source of truth for these resource patterns instead of scattered, team-specific implementations
Stack