Open to new opportunities

Gorun Jinian Software Developer

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

About

Engineering self-sovereign software.

I am a software developer working at the intersection of Bitcoin, mobile platforms, and applied cryptography.

My work centers on air-gapped architectures, deterministic key derivation, and tools that give users direct custody of their digital assets. I value correctness, minimal dependencies, and open-source collaboration.

6+ Years building

3+ 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.

Air-gapped PSBT signing Multi-signature BIP-compliant

Kotlin Android Jetpack Compose Bitcoin

HMAC to BIP39 Converter

A utility that derives BIP-39 mnemonic seeds from HMAC-SHA512 using PBKDF2 key stretching, with entropy estimation and QR export.

Python Cryptography BIP-39

bbqr-kotlin

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

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.

Kotlin BC-UR CBOR

Skills

Technical Expertise

Languages

Kotlin Java Python JavaScript

Mobile

Android Jetpack Compose Material Design

Bitcoin

BIP Standards PSBT Multi-signature Cryptography

Tooling

Git Gradle Android Studio

Contact

Get in touch

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

[email protected] github.com/gorunjinian