Paul Marcelin sqlxpert

Competencies

Terraform

Secure private network:
- An editable configuration map feeds for_each sets and maps
- Strict reciprocal security group egress and ingress rules permit traffic between identified hosts only.
A data-driven, not hard-coded, validation rule and error message
Intuitive defaults with minimal code, for an AWS API data type that can't be reduced to a Terraform HCL type specification
A new S3 object version triggers a Terraform change. Most users forget versionID .

CloudFormation

The same template makes a single-account, single-region stack or a centrally-managed, multi-account, multi-region StackSet:
- "Partial ARN" parameter formats are not specific to any region.
- 1 template with conditions replaces 3 separate templates.
Validation rules and a condition accommodate different kinds of inputs and different cardinalities.
A least-privilege CloudFormation service role protects each workload and reduces "confused deputy" risk.
Placeholder parameters help AWS Console users to name stacks and find documentation.

IAM

Enforce KMS encryption in S3:
- One central resource control policy (RCP) covers buckets in many accounts.
- Tags and self-service documentation reduce developers' dependence on the infrastructure team
- Templated test buckets support thorough, realistic, automated tests
- Keywords communicate properties of test buckets without duplicate code
Enforce S3 storage class:
- One central resource control policy (RCP) covers buckets in many accounts.
- History of S3, IAM, and AWS Organizations feature releases provides an architectural decision record.
- Safe permissions delegation trick ( Detailed semantics , Item 4)
Restrict Lambda function permissions using attribute-based access control, then protect ABAC tags with a service control policy (SCP)
Restrict instead of rewriting an AWS-managed policy, for self-documenting, maintainable least-privilege
IAM policy variables avoid code duplication:

Python

Object-oriented design:
- Harmonizes AWS API inconsistencies — method names; input argument names, types (ID versus ARN), and cardinality; and output object keys
- Accommodates varied AWS resource types
- Describes capabilities at a glance and supports extensibility
OpenAPI provides a clear API specification and automatic input validation with minimal, focused code.
Clear and consistent error-handling functions
Structured JSON logs, searchable by humans and readable by machines
Self-documenting regular expression

Containers/Docker

A simple container definition yields a secure and small image.
Elastic Container Service (ECS) and load balancing support scalable orchestration.

Reliability