James Garinger - Full-Stack & Blockchain Engineer

Projects that showcase my technical expertise and innovation.

AmanuCash

Contactless Payment Experiences.

$10M Valuation 500+ Users Featured in CoinDesk

Built a revolutionary payment protocol that raised $10M in funding and serves 500+ users. Won 1st place at Consensus 2024 for contactless event airdrops using ultrasound technology.

XRPLFlows

Programmable money flows.

Drag & Drop XRPL Integration

Built a web application that allows users to drag and drop first-principle building blocks to create programmable money flows using XRPL. Enables visual composition of complex payment logic and automated financial workflows.

Off-Ramp Widget

Crypto-to-fiat bridge.

Privy Integration Multi-Country KYC

The Off-Ramp Widget seamlessly bridges traditional banking and crypto, enabling users to convert stablecoins into fiat with ease. Designed to leverage Privy's email OTP wallets, this lightweight and configurable widget offers a user-friendly experience—ideal for non-crypto users who prefer simple email-based authentication.

GPT Audio Chat

Real-time AI conversations.

Real-time Audio AI Integration

Built a real-time voice-to-voice AI chat application with seamless audio processing. Integrated OpenAI API for natural conversation flow and implemented Web Audio API for low-latency voice interactions.

Bare Kombucha

Local business website.

Responsive Design Local Marketing

Designed and developed a modern website for a family-owned kombucha business launching in Austin. Built responsive frontend with local farmer's market focus, product showcase, and contact integration for their community-driven startup journey.

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Achievements that demonstrate my impact and recognition in the industry.

Consensus 2024 Winner

1st Place • Ultrasound Payments

$25K Prize 50+ Teams Blockchain Innovation

Won 1st place at the world's largest blockchain hackathon with 50+ competing teams. Built revolutionary ultrasound payment protocol for contactless event airdrops, securing $25K prize and industry recognition.

Startup Success

$10M Valuation

VC Backed 500+ Users Featured in CoinDesk

Built and scaled AmanuCash to $10M valuation with 500+ active users. Secured VC funding and received six-figure acquisition offers. Featured in CoinDesk for innovative payment protocol development.

Crecimiento

Government Sandbox

Argentina Innovation Zone Stablecoin Payments

Selected as one of only 10 startups out of hundreds of applicants for Argentina's first legal government sandbox. Worked with real merchants and stores to revolutionize stablecoin payments in a regulated environment.

TryHackMe Top 5%

Cybersecurity Challenges

Top 5% Hacking Fun Problem Solving

Ranked in the top 5% of TryHackMe users by solving cybersecurity challenges and CTF competitions. Enjoyed the puzzle-solving aspect of ethical hacking and learning about system vulnerabilities in a gamified environment.

UT Austin Bootcamp

Intensive Full-Stack Program

Group Coding Teamwork Full Staff

Completed intensive full-stack development bootcamp at UT Austin with full cohort, group coding sessions, and dedicated staff. Gained hands-on experience in collaborative development and modern web technologies.

Consensus 2024

3rd Place • Polkadot Track

$2K Prize MIT Integration Robot Dog Payments

Secured 3rd place in the Polkadot track with innovative robot dog payment system. Integrated MIT's robotics technology with blockchain payments, earning $2K prize and recognition from industry leaders.

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Technical Skills that demonstrate my expertise across full-stack development and blockchain technologies.

JavaScript TypeScript Python (basic) C# (basic) C++ (basic)

Languages

React Next.js HTML CSS Tailwind CSS Framer Motion Three.js (basic) jQuery

Frontend

Node.js Express.js WebSockets Socket.IO WebRTC

Backend & Realtime

ethers.js viem xrpl.js IPFS ERC-4337 Hardhat Solidity Privy Smart Wallets Gas Sponsorship ZeroDev Stealth Wallets

Blockchain/Web3

MongoDB Mongoose SQL MySQL PostgreSQL TimescaleDB

Databases & ORMs

React Native Expo Arduino ESP32 MQTT

Mobile & IoT

Nmap Wireshark Burp Suite sqlmap Hydra Metasploit HTTP OWASP Encryption Hashing Windows Linux

Security Toolkit

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*there are definitely more I should be adding that i'm forgetting about right now.