Heinz Gies
Principal Engineer at Axiom
Berlin, Germany
Summary
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RockstarHeinz Gies is a Principal Engineer based in Berlin with 16 years of experience building high-performance backend systems and storage software. He combines hands-on systems work with leadership roles at Wayfair and Axiom, focusing on distributed systems, performance optimization, and reliable storage. A prolific open-source contributor in Rust and Erlang ecosystems, his work includes impactful improvements to projects like openraft (RocksDB-backed Raft storage), tremor-runtime, simd-json, and clippy lints. Heinz shows a pattern of pragmatic engineering: refactoring for maintainability, optimizing hot paths for measurable speedups, and hardening error handling and developer experience. He also brings cross-platform deployment and packaging expertise from contributions to LeoFS and FrameworkBenchmarks. Colleagues rely on him for turning complex concurrency and storage challenges into testable, high-throughput solutions.
16 years of coding experience
6 years of employment as a software developer
German, English
Github Skills (43)
algorithm10
dependency-manager10
dependency-management10
json-parser10
json10
algorithms10
consensus10
benchmark10
erlang10
dtrace10
dependency-analysis10
testing10
macros10
rocksdb10
jsonp10
Programming languages (26)
Github contributions (5)
tremor-rs/tremor-runtime
Jul 2018 - Dec 2022
Main Tremor Project Rust Codebase
Role in this project:
Back-end Developer
Back-end DeveloperContributions:8 releases, 1534 reviews, 2051 commits in 4 years 6 months
Contributions summary:Heinz's contributions focused on improving the functionality and performance of the Tremor runtime project. Their commits primarily involved refactoring and optimizing code, addressing bugs related to memory management, and implementing performance improvements in the form of optimized code. The user also added functionality to the tremor-script environment by adding system calls, and addressed various other code and compilation errors.
tremor-queryrusttremor-languagescodebasetremor
simd-lite/simd-json
Mar 2019 - Jan 2023
Rust port of simdjson
Role in this project:Back-end Developer
Back-end DeveloperContributions:104 reviews, 550 commits, 348 PRs in 3 years 10 months
Contributions summary:Heinz primarily contributed to the development of the `simd-json` project, which is a Rust port of the `simdjson` library. The contributions primarily involve refactoring and reimplementing key components of the parser with a focus on the parsing and deserialization of JSON data. They improved the code by introducing string parsing optimization, and error reporting. They fixed known issues within the codebase, including an issue with Unicode codepoint handling, while also working on increasing the test coverage of the project.
simdjsonsimdrustrust-cratejson
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