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@mbj

Markus Schirp

mbj
Malta

Author of mutant, the mutation testing engine for Ruby. Author of unparser, the only Ruby AST to source converter. Author of stratosphere, the only type-safe CloudFormation generator for both Haskell and Rust.

Currently building Rust crates for AWS infrastructure, PostgreSQL tooling, and CloudFormation generation. Porting what worked in Haskell for 8 years into the Rust ecosystem.

Sponsorship supports continued development and maintenance across all three ecosystems.

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Current sponsors 2

@dgollahon
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Past sponsors 8
Private Sponsor
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Featured work

  1. mbj/mutant

    Mutation testing for Ruby. AI writes your code. AI writes your tests. But who tests the tests?

    Ruby 2,105
  2. mbj/unparser

    Turn Ruby AST into semantically equivalent Ruby source

    Ruby 326
  3. mbj/stratosphere

    Haskell EDSL and type-checker for AWS CloudFormation templates

    Haskell 168
  4. mbj/mrs

    Foundational Rust building blocks

    Rust 11

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