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Julian MartinezJulian Martinez

Full-stack engineer building end-to-end products across AI agents, Web3 protocols and developer tooling.

I'm Julian - I ship the whole product, from Next.js frontends and FastAPI backends to TypeScript SDKs, smart contracts, and the AI agents that tie them together.

See my workRésumé ↓
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01Manifesto

I believe in shipping the whole thing.

Julian Martinez

Five years building end-to-end applications across AI agent systems, Web3 protocol integrations, and developer tooling. I deliver complete solutions - Next.js frontends, FastAPI backends, TypeScript SDKs, smart contracts, and the infrastructure that holds them together.

80+ merged pull requests across 12+ major open-source organizations - OKX, Enkrypt, Stellar, Avalanche, SendAI, ElizaOS, Foundry - and a published npm SDK that thousands of developers ship on every week.

Julian - writing software from San Diego, one merged PR at a time.

02Selected Work

Where I've shipped.

OKX

Senior Full-Stack Engineer

Sep 2024 - Sep 2025

San Francisco, CA

~20K
npm downloads / week

Architected and shipped the OKX DEX SDK - full type coverage across EVM, Solana, SUI & TON - and drove its adoption into major wallets and AI agent runtimes.

  • Built the TypeScript/JavaScript OKX DEX SDK with merged PRs into the official okx/okx-dex-sdk repo - ~20K downloads/week on npm.
  • Led DEX API integration into Enkrypt and Phantom wallets - backend swap logic and frontend flows for millions of combined users.
  • Integrated OKX DEX into SendAI's Solana Agent Kit and the ElizaOS plugin registry, opening an AI-native distribution channel.
  • Authored official OKX swap documentation and reference implementations for Solana, EVM, SUI & TON.
TypeScriptNext.jsDEX APIEVMSolanaSUITONView PRs

Stellar Development Foundation

Senior Full-Stack Engineer

May 2023 - Sep 2024

San Francisco, CA

50+
merged PRs

Authored the Soroban smart-contract platform documentation and reference dApps that shipped with the mainnet launch.

  • 50+ merged PRs across stellar-docs, soroban-docs, soroban-examples, soroban-quest & the dApps challenge.
  • Wrote the Solidity-to-Rust migration guides and the Essential Guide to Rust Development on the Stellar blog.
  • Built full-stack Rust reference dApps used as canonical Soroban onboarding examples.
  • Implemented automated testing pipelines, cutting regression rate 40%+ across release cycles.
RustSorobanSolidityDocsCI/CDView PRs

Blue (FKA IdentDefi)

Solidity Engineer

Sep 2022 - Dec 2022

Saint Petersburg, FL

100%
test coverage

Designed and shipped a production smart-contract stack from scratch in under three months.

  • Built access controls, security architecture, and upgrade patterns in Solidity + Hardhat with 100% test coverage.
  • Optimized bytecode with library patterns, cutting gas costs ~30% and delivering Phase 1 on schedule.
SolidityHardhatSecurity

Avalanche (Ava Labs)

Full-Stack Engineer

Jun 2021 - Sep 2022

Brooklyn, NY

20+
builders-hub PRs

Shipped to core Avalanche tooling and built full-stack dApps on the C-Chain and custom subnets.

  • Code contributions into ava-labs/avalanchejs (CB58 decode #606, base fees #582, sample scripts #591) and ava-labs/subnet-evm.
  • 20+ merged PRs into ava-labs/builders-hub: contract deploys, cross-chain bridges, Foundry & Gnosis Safe, OKX integration.
  • Built lending protocols and trading platforms processing millions in on-chain volume.
TypeScriptSoliditysubnet-evmFoundryView PRs

CanYa

Blockchain Developer

Mar 2021 - Aug 2021

Brisbane, Australia

0
critical audit findings

Shipped BEP20-optimized contracts and Web3 frontend into the primary product.

  • Developed BEP20 Solidity contracts on Binance Smart Chain and integrated Metamask/Web3 into the web app.
  • Contracts passed a full security audit with zero critical findings at launch.
SolidityBSCWeb3.jsMetamask
03Featured Projects

Things I've built.

npm Package · OKX

OKX DEX SDK

~20K downloads / week

A published TypeScript SDK for multi-chain DEX aggregation across EVM, Solana, SUI & TON, with full type coverage. Merged into OKX's official repository and shipped by thousands of developers worldwide.

TypeScriptEVMSolanaSUITON
npmGitHub
Open Source · AI Agent

Hermes Trader

500+ markets · 100 MCP tools

An autonomous multi-market trading agent for Hyperliquid. Scans 500+ markets, filters with multi-timeframe technical analysis, researches confirmed signals with AI, then manages capital through 11 independent risk gates and a two-phase trailing-stop engine.

PythonFastAPIHyperliquid SDKOpenRouterMCPDocker / K8s
GitHub
AI Agent

Sentient Market Reader

A live Kalshi prediction-market algorithmic trader powered by a multi-agent ROMA framework and Claude, with Appwrite auth and per-user encrypted credential storage.

TypeScriptROMAClaudeAppwrite
GitHub
04Open Source

80+ merged PRs across the ecosystem.

Code and documentation shipped into the tools and protocols that thousands of developers build on every day.

OKXTypeScript SDK for multi-chain DEX aggregation - merged into okx/okx-dex-sdk & WEB3-DEX.
EnkryptShipped OKX DEX swap support to millions of wallet users (#726, #730).
SendAIIntegrated OKX DEX into the Solana Agent Kit (#310, #414).
ElizaOSRegistered the OKX DEX plugin into the official elizaos-plugins registry.
CoinbaseContribution into the AgentKit framework (#703).
Stellar50+ merged PRs authoring Soroban docs, migration guides & dApp challenges.
Avalancheavalanchejs, subnet-evm & 20+ builders-hub PRs.
FoundryMerged PR into foundry-rs/book, the industry-standard Ethereum toolkit docs (#380).
05Writing & Talks

Teaching what I build.

Selected Writing

OKX DEX API: Build Swap Applications on SolanaOKX Docs
OKX DEX API: Build Swap Applications on EVMOKX Docs
OKX DEX API: Build Swap Applications on SuiOKX Docs
OKX DEX API: Build Swap Applications on TONOKX Docs
OKX DEX API Guide: Building a Solana Token Swap Interfacedev.to
Introducing Auto Slippage: Making the OKX DEX API Smarterdev.to
Single & Cross-Chain Swaps on Avalanche C-Chaindev.to
Integrate the OKX DEX Widget in 30 Minutesdev.to
Building with Fractal Bitcoin & the OKX DEX APIdev.to
Rust vs. Solidity: Choosing the Best Smart Contract LanguageStellar Blog
Essential Guide to Rust DevelopmentStellar Blog
Introduction to Solidity, Rust, and SorobanStellar Docs

Talks & Workshops

How Do Smart Contracts on Stellar Stack Up?Consensus 2024 · CoinDesk
Build & Deploy a Crowdfunding dApp in RustDeveloper Workshop · YouTube
Solidity to Rust Series (Pt. 1-3)Workshop Series · YouTube
Browse the full index of my docs & content
06By the Numbers
5+
Years building end-to-end
80+
Merged pull requests
12+
Open-source organizations
~20K
npm downloads / week

Toolkit

Languages
TypeScriptPythonRustSolidityJavaScript
Frontend
Next.jsReactWeb3.jsEthers.jsMetamask
Backend
FastAPINode.jsREST APIsAppwrite
Chains
EVMSolanaSUITONAvalancheSorobanBSC
AI
LLM integrationAI agentsRAGMCPOpenRouterClaude
Tooling
HardhatFoundryDockerKubernetesCI/CD

Education

B.S. Software Development
Western Governors University
2022
A.A. Indonesian Language
Defense Language Institute, Monterey, CA
2020
07Contact

Let's build something that matters.

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