👨‍💻

Calvin Stair

Full-stack developer & founder building production-grade apps — mobile, web, blockchain, AI trading systems, and real-time VR platforms. Available for freelance & consulting.

Mobile · iOS / Android Web3 / DeFi AI / Algo Trading Real-time Systems Cloud / AWS Unity / VR

About

I'm a self-driven developer who builds complete, production-ready products — from production mobile apps with real payments and live tracking, to an AI-powered crypto market-intelligence platform monitoring 12+ data sources in real time, to Solidity smart contracts with real token economics, to multiplayer VR environments in Unity 6. I own the full stack: architecture decisions, backend APIs, mobile builds, cloud infra, and deployment pipelines. I've launched multiple apps under my own company and work well independently or as a technical lead on a team.

Portfolio Projects

🔒

Consumer Platform (under NDA)

Full-Stack Product · Mobile + Web + Backend + On-chain

A complete multi-surface consumer product — customer mobile app, web portal, and backend API across an 8-package monorepo — designed and launched independently. Real payments with instant payouts, live tracking, monitoring, Android beta distribution, cloud deployment, and full CI. Details withheld under NDA; architecture and engineering can be discussed privately on request.

React NativeExpo SDK 54 TypeScriptNode.js PostgreSQLPrisma StripeAWS RDS EAS BuildFly.io
📈

CryptoBot

AI Market-Intelligence Platform · Backend + Dashboard

6-layer market-intelligence platform aggregating 12+ data sources — no-key APIs (CoinGecko, Binance, Coinbase, Kraken, Fear & Greed), social sentiment (Reddit, Twitter/X), whale tracking, futures funding, and on-chain signals. Multi-asset scoring engine (BTC, ETH, SOL, BNB) with configurable strategy modules and mean-reversion logic, served as a real-time API. pnpm monorepo, Kubernetes + Docker, pm2.

Node.jsTypeScript REST APIsSQLite KubernetesDocker pm2Vitest Signal Scoring
🎧

VR DJ-Rave Platform

Multiplayer VR DJ Platform · Unity 6 / WebRTC

Real-time VR environment where DJs perform live for a virtual audience across VR headsets and 2D devices. Built as a 4-app monorepo — Unity 6 VR client, 2D web client, companion app, and a custom Node.js SFU + signaling server — with WebRTC audio broadcasting, spatial audio, avatar synchronization, and an on-chain tipping/NFT layer.

Unity 6 (C#)WebRTC VR / XRMeta SDK Node.js SFUMultiplayer Solidity
💸

TipIT

Blockchain Tipping & Loyalty Token · Web3

On-chain tipping/loyalty system for service workers, integrable with a consumer platform. A 3-service product (bot API, site, resources) with a production-shaped TipitToken.sol (ERC-20 + Burnable + Pausable + ReentrancyGuard, 1B supply, 0.1% tip fee split 50% burn / 50% treasury) and a multi-chain deployment path across Ethereum, Solana, and Qubic.

SolidityERC-20 OpenZeppelinHardhat EthereumSolana QubicNode.js API
🎵

DJStudio / MediaExtractor

Professional Audio Tool · Desktop App

Desktop application for professional audio processing and extraction — AI stem separation (Demucs / BS-RoFormer), Serato export, and a library analyzer, with audio-engineering standards defined in internal spec docs. Progressive-disclosure UX — minimal chrome, right-click context menus, professional aesthetics inspired by Ableton and FabFilter.

PythonTkinter TauriAudio DSP Desktop AppUX Design

Technical Skills

Languages

  • TypeScript / JavaScript
  • Python
  • C# (Unity)
  • Solidity
  • SQL

Mobile / Frontend

  • React Native
  • Expo (SDK 54)
  • EAS Build & Submit
  • iOS & Android
  • HTML / CSS

Backend / APIs

  • Node.js
  • REST API design
  • PostgreSQL
  • SQLite
  • Prisma ORM

Cloud / DevOps

  • AWS (RDS, CodeBuild)
  • Fly.io
  • Kubernetes
  • pm2 · Docker
  • CI/CD · Sentry

Blockchain / Web3

  • Solidity / ERC-20
  • Smart contract dev
  • Hardhat / deploy
  • Multi-chain (ETH/SOL/Qubic)
  • On-chain analytics

Game / VR

  • Unity 6 (C#)
  • WebRTC networking
  • Meta / XR SDK
  • Audio systems
  • Multiplayer arch

Services Offered

📱 Mobile App Development

iOS & Android apps with React Native + Expo. Payments (Stripe), push notifications, maps, auth, EAS builds, and App Store submission.

⚙️ Backend / API Engineering

Production Node.js/TypeScript APIs, PostgreSQL schemas, REST design, pm2/Docker/k8s deployment, and cloud infra on AWS or Fly.io.

🤖 Trading Bots & Data Pipelines

Automated signal engines aggregating real-time market data, on-chain analytics, sentiment feeds, and multi-asset scoring logic.

🔗 Blockchain / Web3 Development

Smart contract development in Solidity, ERC-20 tokens with real economics, contract deployment pipelines, and Web3 mobile app integration.

🎮 Unity / VR / Game Dev

Real-time multiplayer experiences in Unity 6 with WebRTC networking, VR platform integration (Meta SDK), and custom audio systems.

🖥️ Desktop App Development

Python or Tauri-based desktop tools with professional UX. Specializing in power-user interfaces for creative/technical domains.

Contact

📧
Email
c@stair.run
🟣
Contra
contra.com/calvin_stair
🎵
Company
stair.run