Paul Marcelin sqlxpert

Technical Competencies

Terraform

Secure private network:
- Editable configuration map feeds for_each sets and maps
- Strict reciprocal security group egress and ingress rules permit traffic only between identified hosts, not within entire private IP address blocks
Data-driven, not hard-coded, validation and error
Intuitive defaults with minimal code, for an AWS API data type that can't be reduced to a Terraform HCL type specification
New S3 object version triggers a Terraform change (most users forget versionID )

CloudFormation

Same template for individual stacks or a centrally-managed, multi-account, multi-region StackSet:
- "Partial ARN" parameters are not region-specific
- Conditions replace 3 separate templates
Validation rules and a condition accommodate different kinds of inputs and different cardinalities
Least-privilege CloudFormation service role protects each workload and reduces "confused deputy" risk
Placeholder parameters help new (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:
- Explanation with examples, in response to a user request
- CloudFormation parameter
- Insertion into IAM policy

Python

Object-oriented programming (OOP):
- Harmonize AWS API inconsistencies — method names; input argument names, types (ID versus ARN), and cardinality; output object keys
- Accommodate disparate AWS resource types
- Define capabilities
- Support extensibility
OpenAPI provides a clear API specification and automatic input validation with minimal, focused code
Clear and consistent error-handling functions
Typed, structured JSON log entries, machine-readable and searchable by humans
Self-documenting regular expression

Containers/Docker

Reliability