Gorun Jinian Open-Source Software Engineer

I build secure, privacy-focused software, with a focus on Bitcoin infrastructure and applied cryptography.

About

Engineering self-sovereign software.

I am an open-source software engineer working at the intersection of Bitcoin, mobile platforms, and applied cryptography.

My work centers on air-gapped architectures and tools that give users direct custody of their Bitcoin — most notably MetroVault, which turns any Android phone into a Bitcoin hardware wallet. I value correctness, minimal dependencies, and open-source collaboration.

6+ Years building

5+ Shipped projects

100% Open source

Projects

Selected Work

A subset of recent projects focused on Bitcoin tooling and secure software.

Featured

MetroVault

An air-gapped, offline Bitcoin wallet for Android. Private keys are generated and stored on a device that never touches the internet, with PSBT signing over QR codes. Available on F-Droid with reproducible builds and as direct APK releases on GitHub.

Air-gapped PSBT signing Multi-signature Silent Payments BIP-compliant

Visit metrovault.app

Kotlin Android Jetpack Compose Bitcoin

Vaultovich

The Kotlin/JVM Bitcoin library behind MetroVault — offline key derivation, PSBT and Taproot signing, with no networking or Android dependencies.

Maven Central com.gorunjinian:vaultovich

Kotlin Bitcoin PSBT Taproot

bbqr-kotlin

A Kotlin implementation of the BBQr specification for encoding and splitting large payloads — such as PSBTs — across sequences of animated QR codes.

Maven Central com.gorunjinian:bbqr

Kotlin BBQr QR

bcur-kotlin

A Kotlin port of Blockchain Commons' Uniform Resources (UR / BC-UR) — a standard for transmitting structured cryptographic data over air-gapped channels.

Maven Central com.gorunjinian:bcur-kotlin

Kotlin BC-UR CBOR

Skills

Technical Expertise

Languages

Kotlin Java Python

Mobile

Android Jetpack Compose Material Design

Bitcoin

BIP Standards PSBT Multi-signature Cryptography

Tooling

Git Gradle Android Studio Reproducible builds F-Droid

Contact

Get in touch

I welcome inquiries regarding collaboration, consulting, or professional opportunities — particularly those involving Bitcoin infrastructure, mobile security, or applied cryptography.

contact@gorunjinian.com github.com/gorunjinian