Matt Muller
Winchester, Virginia, United States
Summary
🤩
Rockstar🎓
Top SchoolMatt Muller is a lead software engineer with eight years of experience building and maintaining large-scale developer tooling and cloud SDKs, most notably as a core maintainer of the AWS SDK for Ruby used by hundreds of thousands of developers. At AWS he designed and implemented high-impact features across S3, auth, endpoint resolution, and cross-SDK capabilities like FIPS/DualStack and CBOR RPCv2, and led the development of Smithy Ruby, a code generator used to produce Ruby API clients from service models. His open-source contributions span the Ruby ecosystem, including practical JVM-level fixes to JRuby that improved socket and I/O behavior, reflecting his comfort working across language boundaries and runtime internals. He combines back-end engineering and DevOps sensibilities to improve performance, error handling, and signature validation in critical SDK paths. Based in Winchester, VA, he pairs an MS in Information Security with hands-on product delivery at scale, bringing a security-conscious mindset to SDK and tooling design. Colleagues would describe him as pragmatic and detail-oriented, able to drive cross-SDK features from design through production.
7 years of coding experience
10 years of employment as a software developer
Master of Science - MS, Information Security, Master of Science - MS, Information Security at James Madison University
Github Skills (16)
aws-s310
ruby10
socket-io10
javas10
socket10
jvm10
amazon-s310
aws10
java10
s3-bucket10
rest-api9
concurrency8
testing8
devops7
performance-analysis7
Programming languages (13)
Github contributions (5)
aws/aws-sdk-ruby
Aug 2019 - Dec 2022
The official AWS SDK for Ruby
Role in this project:
Back-end & DevOps Engineer
Back-end & DevOps EngineerContributions:490 reviews, 344 commits, 591 PRs in 3 years 4 months
Contributions summary:Matt primarily focused on enhancing the AWS SDK for Ruby, with a focus on improving the S3 service's performance and functionality. They added features such as handling S3 Express related features and added support for the new presigned post, handling both the generation and verification of credentials. They also improved the SDK's internal error handling mechanisms, resolving issues with the request and adding validations where necessary. Their work included performance improvements, along with fixing several issues related to how request signatures were handled across various service configurations.
sdkaws-sdkrubycloudaws
jruby/jruby
Nov 2023 - Jun 2024
JRuby, an implementation of Ruby on the JVM
Role in this project:Back-end Developer
Back-end DeveloperContributions:4 reviews, 2 PRs, 4 comments in 6 months
Contributions summary:Matt contributed to the JRuby project by addressing several core issues within the Java implementation. Their work includes fixing IPv6 address handling in IPSocket, modifying IO processing for IO.popen, removing unused imports and improving code readability. The user also moved string constants for better maintainability, and made minor improvements in the core Java files. These changes focused on improving the socket and I/O functionalities of the JRuby runtime.
ruby-languageconcurrencyrubyjvmperformance
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