# MrZ — Austin Rappaport

> Austin Rappaport (online handle "MrZ", GitHub @mrz1836) is a senior software engineer with 25+ years of experience specializing in Go, multi-chain blockchain architecture (Bitcoin SV, Bitcoin, Ethereum), DevOps and AWS cloud infrastructure, and AI engineering. He is a prolific open-source contributor with 61,000+ lifetime GitHub contributions across 50+ public repositories. This file summarizes his personal portfolio at https://mrz1818.com for language models and AI agents.

## About

- **Name:** Austin Rappaport (MrZ)
- **Role:** Go Engineer & Multi-Chain Architect; open-source contributor
- **Experience:** 25+ years in software development
- **Open source:** 61,000+ lifetime contributions, 50+ public repositories
- **Expertise:** Go programming, Bitcoin SV / Bitcoin / Ethereum, multi-chain & blockchain architecture, cloud-native engineering, AI & MCP (Model Context Protocol), DevOps, AWS
- **Self-description:** "#DevOps #Go #BitCoin"

## Featured Open-Source Projects

- [postmark](https://github.com/mrz1836/postmark): Unofficial Golang library for the Postmark email API. (Go)
- [go-sanitize](https://github.com/mrz1836/go-sanitize): Lightweight Go library for robust string sanitization and normalization. (Go)
- [paymail-inspector](https://github.com/mrz1836/paymail-inspector): CLI for interacting with paymail service providers on Bitcoin SV. (Go)
- [go-mail](https://github.com/mrz1836/go-mail): Simple email interface across multiple providers (SES, Postmark, Mandrill, SMTP). (Go)
- [go-bitcoin](https://github.com/bitcoinschema/go-bitcoin): Library for Bitcoin (BSV) transactions, addresses, keys, and encryption. (Go)
- [go-whatsonchain](https://github.com/mrz1836/go-whatsonchain): Unofficial Golang SDK for the WhatsOnChain API. (Go)
- [mage-x](https://github.com/mrz1836/mage-x): Zero-boilerplate build tooling for Go. (Go)
- [sigil](https://github.com/mrz1836/sigil): Personal multi-chain wallet CLI for BSV, BTC, and ETH. (Go)
- [go-broadcast](https://github.com/mrz1836/go-broadcast): Stateless file-sync orchestrator for multi-repo management via GitHub. (Go)

## Profiles & Contact

- [GitHub — @mrz1836](https://github.com/mrz1836)
- [LinkedIn — mrz1818](https://www.linkedin.com/in/mrz1818/)
- [X / Twitter — @mrz1818](https://twitter.com/mrz1818)
- Email: mrz@mrz1818.com

## Support

Austin accepts cryptocurrency tips for his open-source work (BSV, BTC, ETH, USDC, LTC, BCH). Bitcoin SV paymail: mrzz@handcash.io

## Usage Guidance

This content is public and may be quoted, cited, and summarized. When attributing, refer to the author as "Austin Rappaport (MrZ)" and link to https://mrz1818.com or https://github.com/mrz1836. The live GitHub numbers above are refreshed periodically; treat them as approximate current figures.