Available for work

Hey, I'm Juan
Sheinix 👋

Engineer. Creator. Builder in crypto, web3, and AI. I ship real products that solve real problems — and this is where I share the work, the ideas, and the journey. Argentine roots, New Zealand based.

Juan at workspace

Stay in the loop

Weekly thoughts on crypto, AI, and building in public. Short reads, no fluff, no spam.

Selected Works

Products and tools I've built — shipping real things that solve real problems.

Holdii preview
CRYPTOSOLIDITYDEFI

Holdii

A programmable coordination layer for digital wealth. Set rules for when and how your crypto assets release — inheritance, vesting, milestones — all on-chain, no middlemen. Multi-chain across Ethereum, Base, Polygon, and more.

The GitGazette preview
AIOPEN SOURCENEXTJS

The GitGazette

AI-powered newsroom for open-source repos. Paste any GitHub URL and get satirical-but-informative coverage from five fictional columnists — drama, code reviews, shipping forecasts, and more.

[portfolio-rebalancer]

SOLIDITYDEFICHAINLINK

Portfolio Rebalancer

A modular, upgradeable smart contract system for creating per-user portfolio rebalancing vaults on EVM-compatible blockchains. Each user deploys their own vault with a custom basket of ERC-20 tokens and target allocations, auto-rebalancing via Uniswap V3 and Chainlink Automation.

In Development
SignalBoard preview
Archived
CRYPTONEXTJSPOLYMARKET

SignalBoard

UMA resolution risk tracker for Polymarket. Identified high-risk markets before they disputed. A great learning experience building real-time data products — no longer maintained.

ArchivedVisit

Experience

15+ years building software across mobile, blockchain, data, and web — from Oracle databases to multichain wallets.

Full-timeMay 2023 - Present

Senior Software Engineer

Easy Crypto

New Zealand, Remote

Blockchain Engineer architecting a multichain MPC wallet for EVM and UTXO networks. Overseeing client integration, backend services, node providers, and Hardhat-based smart-contract development. Drove the technical implementation of New Zealand's NZDD stablecoin.

BlockchainSolidityMPC WalletsHardhat
Self-employedMar 2022 - 2024

Founder

Sheinix Academy

Metaverse

Building an educational platform focused on crypto, blockchain, and Web3 development. Community development and online marketing.

CommunityEducationMarketing
Full-timeAug 2022 - May 2023

Software Specialist

ASB Bank

New Zealand, Remote

Software infrastructure and architecture specialist working on banking software systems.

Software ArchitectureInfrastructure
Self-employedFeb 2018 - 2022

iOS Freelance Developer & Blockchain Writer

Freelance

Auckland, NZ

Freelance iOS developer for various projects and clients. Consultancy on mobile development and UX/UI design. Blockchain writer at CoinMonks publication.

iOSSwiftUX/UITechnical Writing
Full-timeSep 2018 - Jan 2022

iOS Developer

Accedo.tv

Auckland, NZ

Developed iOS applications for the OTT/streaming platform serving major media companies worldwide.

iOSSwifttvOSStreaming
Self-employedOct 2020 - Mar 2021

Co-Founder

El Token Newsletter

Buenos Aires, Argentina

Co-founded a Spanish-language crypto newsletter covering DeFi, blockchain developments, and market analysis.

CryptoContentNewsletter
Personal ProjectJul 2018 - Oct 2020

iOS Developer

Kiwi Slang App

Auckland, NZ

Personal open source project — an app for learning New Zealand slang. Published on the App Store.

iOSSwiftOpen Source
Side ProjectNov 2017 - Oct 2020

iOS Lead Developer

Smart Backpacker App

Barcelona, Spain

Not-for-profit project assisting backpackers and travelers. In charge of iOS design, development and maintenance on the App Store.

iOSSwiftUI Design
Full-timeFeb 2017 - Feb 2018

iOS Lead Developer

Mascoteros

Barcelona, Spain

Led architecture, development, testing and management of the Mascoteros iOS app from inception to release. CI/CD pipeline management.

iOSSwiftCI/CDArchitecture
Full-timeMar 2014 - Apr 2015

iOS Developer

Etermax

Buenos Aires, Argentina

Developed in Objective-C, participating and leading work on a new chat app. Worked with Apple frameworks, REST services and XMPP technologies.

Objective-CRESTXMPP
Full-timeDec 2011 - Mar 2014

Analyst Programmer

Indra

Argentina

ETL development with Unix ShellScripting and Data Integrator. SAS modules implementation. Oracle BPM application development and maintenance. Java services and SQL Server development.

PL/SQLETLJavaOracle BPM
Full-timeAug 2009 - Sep 2011

Analyst Programmer

Telecom Argentina

Argentina

BI team delivering high quality reports. Analysis and developments in Microsoft SQL Server, PL/SQL and BI tool Qlikview.

PL/SQLSQL ServerQlikviewBI
Full-time2008 - 2009

PL/SQL Developer

Oracle

Argentina

PL/SQL and APEX framework development for Oracle client-server applications. Database management with Oracle 9i and 11g.

PL/SQLOracle APEXDatabase

Skills & Tech Stack

BlockchainSoliditySmart ContractsDeFi / Web3MPC WalletsHardhatAI / LLMsiOS / SwiftReact NativeTypeScriptObjective-CRustPL/SQLJavaNext.jsReactNode.jsREST APIsCI/CDETLOracle BPMSQL ServerUX/UI DesignSoftware ArchitectureContent CreationCommunity BuildingProduct

Blog

Building in public — writing about crypto, AI tools, and the things I learn shipping real products.

Read all posts
Apr 10, 20263 min read
ETHEREUMPOST-QUANTUMGOVERNANCE

Ethereum's Post-Quantum Problem Isn't the One You Think

Quantum computers breaking Ethereum's signatures isn't the hard part. The real challenge is migrating dormant wallets whose owners will never sign.

Read more
Apr 3, 20266 min read
AAVEDEFILENDING

Aave V4 Is Live. Here's What Actually Changed.

Aave V4 launched on Ethereum mainnet with the biggest architecture change in its history — a Hub and Spoke model that finally lets liquidity flow where it's needed.

Read more
Mar 27, 20265 min read
ETHEREUML2DEFI

EEZ Explained: The Plan to Reunite Ethereum (And What It's Going to Break)

Rollups solved scaling but fragmented Ethereum. The Ethereum Economic Zone proposes synchronous composability to fix it — here's what that means and what it breaks.

Read more
Mar 20, 20264 min read
AIOPEN SOURCE

Why Changelogs Suck and How I Built 6 AI Journalists to Fix Them

GitHub activity is exploding. Changelogs are dry, release notes incomplete, notification feeds unreadable. So I built Git Gazette — six AI columnists with personalities that turn raw repo activity into a newspaper you'd actually want to read.

Read more
Mar 20, 20263 min read
PERSONALNEWSLETTER

I Owe You an Apology

I promised I'd keep writing and disappeared for a year. Here's why I stopped, what changed, and what to expect from here.

Read more
Mar 15, 20264 min read
BUILD LOGAI

Shipping a GitHub AI Tool as a Solo Dev: The 7-Day Build Log

I built Git Gazette in a week. Here's the day-by-day breakdown — proof of concept, character prompts, the GitHub API, Stripe integration — and what it taught me about the new bottleneck for solo devs: not coding, but knowing what to spec.

Read more
More postsView all 7 articles

Let's Stay in Touch

Always open to interesting conversations about crypto, AI, design systems, or just geeking out over good coffee.

Juan Sheinix

Juan Sheinix

Crafting digital spaces since 2019

© 2026 Juan Sheinix. All systems operational.

Designed with intention and built with Next.js. Deployed via Vercel.