Friedel Ziegelmayer - Chief Technology Officer at Number 0

Friedel Ziegelmayer

Chief Technology Officer at Number 0

Germany

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Summary

🤩

Rockstar

🎓

Top School

Friedel Ziegelmayer is a CTO and seasoned technology leader with 13 years of experience building and scaling distributed systems, developer tools, and crypto/peer-to-peer infrastructure from Germany. Previously a Team Lead at Protocol Labs, he has deep hands‑on expertise across Go and Rust, contributing to high-profile open-source projects like libp2p, IPFS, and rust‑crypto libraries. His track record spans backend systems, async runtimes, cryptographic primitives and frontend/devops work—comfortable moving between low-level networking, performance-sensitive Rust code and browser-based test and UI improvements. He has repeatedly modernized and refactored core components (websocket transports, async runtimes, cryptographic modules) and improved cross-language interoperability (notably Go↔JS IPFS interop). Trained as a mathematician (Diplom), he brings rigorous algorithmic thinking to practical engineering and systems design. Known for combining leadership with sustained individual contributions, he focuses on robust, testable implementations that scale in real distributed environments.

13 years of coding experience

9 years of employment as a software developer

Diplom Mathematics, Diplom Mathematics at The University of Freiburg

Abitur, Abitur at Richard-Fehrenbach-Gewerbeschule Freiburg

English, German

Github Skills (122)

hugo10

multithreading10

peer-to-peer10

testing10

low-level10

databases10

ipfs10

websocket10

mio10

gruntjs10

bignum10

low-level-programming10

modular-arithmetic10

async-await10

browserify10

Programming languages (24)

JavaC++CSSRustCGoHTMLJupyter Notebook

Github contributions (5)

rpgp/rpgp

Sep 2017 - Dec 2022

OpenPGP implemented in pure Rust, permissively licensed

Role in this project:

Back-end Developer

Contributions:23 releases, 353 reviews, 380 commits in 5 years 4 months

Contributions summary:Friedel implemented various features within the pure Rust OpenPGP library, focusing on core cryptography and data handling logic. Their contributions included the implementation of a collection of functionalities with EOL handling. Furthermore, they demonstrated expertise in the parsing of PGP packets and subpackets, the implementation of key generation, and the addition of message encryption and decryption capabilities. The user's work indicates a strong focus on security and cryptography.

openpgprustgnupgpgppure-rust

RustCrypto/RSA

Jul 2018 - Apr 2022

RSA implementation in pure Rust

Role in this project:

Back-end Developer

Contributions:83 reviews, 101 commits, 81 PRs in 3 years 9 months

Contributions summary:Friedel contributed to the implementation of a probabilistic prime checker within the `rsa` repository. They introduced the `prime` module, added test cases, and implemented the Miller-Rabin and Lucas primality tests. The work involved adding mathematical functions such as modular inverse and jacobi to the repository as well. They made multiple commits to enhance the testing of the implemented prime checking algorithms.

rustcryptographypure-rustrsa

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