Anton Grübel
Principal Software Engineer at Baz
Greater Hamburg Area Germany
Summary
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RockstarAnton Grübel is a Principal Software Engineer based in the Greater Hamburg Area with eight years of experience building reliable, secure cloud-native systems and developer tooling. He has progressed from DevOps roles at financial and retail companies to principal engineering positions at Palo Alto Networks and Baz, blending infrastructure expertise with backend development. A pragmatic contributor to prominent open-source projects—including typeshed, moto, and pytorch/ignite—he focuses on improving type safety, testability, and AWS emulation features that make tooling more robust for other engineers. His work shows an unusual mix of security-conscious engineering (cloudsplaining) and meticulous static-typing improvements that reduce runtime bugs and improve maintainer confidence. Equally comfortable diving into IAM policy semantics or annotating Python special methods, he delivers pragmatic improvements that scale across teams and codebases.
8 years of coding experience
7 years of employment as a software developer
Github Skills (30)
pytorch10
static-typing10
typesc10
boto10
pytest10
python10
stub10
aws-security10
stubs10
testing10
mypy10
dynamic-typing10
typescript10
machine-learning10
amazon-web-services10
Programming languages (15)
Github contributions (5)
getmoto/moto
Aug 2019 - Aug 2021
A library that allows you to easily mock out tests based on AWS infrastructure.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:9 reviews, 112 commits, 63 PRs in 2 years
Contributions summary:Anton's commits focused on enhancing the functionality of the `moto` library by adding support for features related to AWS services. They implemented and tested new features for Amazon SNS (including message filtering and filtering on number and string array data types), SQS (redrive policy setting), and SSM (ParameterFilters for describe_parameters) to improve the library's completeness. Furthermore, the user contributed to DynamoDB2 by adding support for ProjectionExpression and ExpressionAttributeNames to get_item and batch_get_item operations, as well as for the deletion of items via ConditionExpression.
awsbotoec2s3
salesforce/cloudsplaining
May 2021 - Jun 2021
Cloudsplaining is an AWS IAM Security Assessment tool that identifies violations of least privilege and generates a risk-prioritized report.
Role in this project:Security Engineer
Security EngineerContributions:68 reviews, 6 commits, 133 PRs in 25 days
Contributions summary:Anton primarily contributed to improving the code's type safety and overall security posture within the `salesforce/cloudsplaining` repository, an AWS IAM security assessment tool. Their commits focused on adding type hints to critical components such as `PolicyDocument` and `StatementDetail`, and excluding non-restrictable actions from constraints. They also modified the behavior of `has_resource_constraints` and added the `unrestrictable_actions` attribute, further refining the tool's analysis capabilities. These changes enhanced the code's readability, maintainability, and accuracy in identifying potential security vulnerabilities.
awsleast-privilegesecurityaws-iamcloud
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