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Matthias J. Kannwischer

PROFILE

Matthias J. Kannwischer

Over a two-month period, contributed to the pq-code-package/mldsa-native and mlkem-c-aarch64 repositories by developing memory- and performance-optimized cryptographic features and strengthening cross-platform CI pipelines. Work included implementing on-demand lazy unpacking and memory-efficient signature generation in C and Assembly, reducing RAM usage and stack footprint for large polynomial operations. Enhanced reliability through bug fixes addressing memory safety and linker warnings, and improved verification with CBMC and expanded benchmarking across ARM, RISC-V, and Mac platforms. Leveraged skills in low-level programming, CI/CD, and formal methods to deliver robust, portable code with improved maintainability, security, and performance validation across diverse environments.

Overall Statistics

Feature vs Bugs

73%Features

Repository Contributions

21Total
Bugs
3
Commits
21
Features
8
Lines of code
2,950
Activity Months2

Work History

April 2026

16 Commits • 6 Features

Apr 1, 2026

April 2026 monthly summary focused on delivering measurable business value through memory- and performance-optimized code, strengthened verification and cross-platform CI, and maintainability improvements across two repositories (mldsa-native and mlkem-c-aarch64).

March 2026

5 Commits • 2 Features

Mar 1, 2026

March 2026: Delivered targeted improvements across two PQ code packages, focusing on RAM efficiency, API stability, and CI reliability. Implemented on-demand lazy unpacking to reduce RAM usage in REDUCE_RAM mode, while preserving correctness. Fixed critical memory-safety bug in AArch64 polyz_unpack to prevent buffer overreads. Resolved public API exposure and GNU-stack linker warnings to improve portability and build cleanliness. Re-enabled CI benchmarking across multiple hardware platforms to strengthen performance validation. Business impact includes lower memory footprints for large polynomials, more robust cross-platform builds, and higher confidence in performance metrics.

Activity

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Quality Metrics

Correctness95.2%
Maintainability87.6%
Architecture91.4%
Performance90.4%
AI Usage21.0%

Skills & Technologies

Programming Languages

AssemblyCMakefileMarkdownNixYAML

Technical Skills

API developmentAWSAssembly LanguageBenchmarkingC programmingC/C++ DevelopmentCBMCCI/CDContinuous IntegrationCross-Platform DevelopmentDevOpsDocumentationEmbedded systemsGitHub ActionsLinux

Repositories Contributed To

2 repos

Overview of all repositories you've contributed to across your timeline

pq-code-package/mldsa-native

Mar 2026 Apr 2026
2 Months active

Languages Used

AssemblyCMakefileMarkdownNixYAML

Technical Skills

C programmingassembly languagedata structureslow-level programmingmemory managementperformance optimization

pq-code-package/mlkem-c-aarch64

Mar 2026 Apr 2026
2 Months active

Languages Used

AssemblyCYAMLMarkdownNix

Technical Skills

API developmentAssembly LanguageBenchmarkingC programmingContinuous IntegrationCross-Platform Development