John – Bitcoin, Solana, Solidity

Profitable low-latency algorithmic trading system with integrated statistical analysis capabilities. Architected, built, tested, and owned the system throughout its lifecycle.

• Sole architect and developer of a live, real-money Solana copy-trading system for a semi-private trading client — built from scratch and currently profitable at increasing scale;
• Built the execution engine in Rust/Tokio: subscribes to target-wallet Solana log streams via Helius LaserStream WebSockets, detects swaps with sub-second latency, and autonomously routes copy trades through Pump.fun bonding-curve execution or Jupiter DEX aggregation depending on liquidity venue;
• Integrated Jito tip routing and Helius priority transaction broadcasting for faster transaction inclusion; implemented concurrent open-position monitoring with trailing stop-loss, peak P&L tracking, supply-aware sizing, and configurable risk-tier controls;
• Built a Python/FastAPI research and backtesting platform that reconstructs full Solana wallet trade histories from Helius enhanced transactions, parses swaps across multiple DEXs, applies FIFO P&L matching, and computes Sharpe ratio, max drawdown, win rate, and copy-latency slot/time deltas to evaluate target wallets before deploying capital;
• Integrated AI-assisted analysis workflows using RAG over curated trading data and MCP-accessible diagnostics to generate session commentary, wallet timeline narratives, and parameter-tuning suggestions;
• Built a React 18/TypeScript operator dashboard with persistent WebSockets, live positions and P&L multipliers, color-coded log stream, task heartbeats, graceful shutdown, force-sell controls, and Google OAuth/JWT-gated access;
• Owned the full engagement: client relationship, architecture, data design, GCP deployment, GCP Secret Manager key handling, automated testing, production support, and iterative execution tuning.

Prediction markets trading and backtesting platform for market-making and quantitative trading strategies.

• Architected and implemented a profitable market-making strategy execution and backtesting platform for Kalshi and Polymarket prediction markets, with shared strategy modules across live trading and historical simulation;
• Designed live trading infrastructure where production execution uses the same strategy logic, parameter model, diagnostics, and evaluation flow as the backtesting engine;
• Built a modular strategy framework supporting Avellaneda-Stoikov market making, order-flow imbalance, sports-market pricing, and proprietary client-specific enhancements;
• Implemented Bayesian/Optuna-based parameter optimization over historical market data, including sports scores and play-level data, where strategy-relevant;
• Integrated real-time AI analysis over live trading diagnostics to support anomaly detection, operational insight, and post-session strategy review;
• Persisted trading sessions, execution history, diagnostics, and AI-generated analysis to support debugging, performance review, and strategy iteration.

A multi-chain decentralized e-commerce platform integrating payment detection, settlement, order flow, merchant tooling, and blockchain workflows.

• Co-founded the company and served as CTO, leading a six-developer team across frontend, backend, smart contracts, and payments infrastructure to deliver a live decentralized e-commerce marketplace with hundreds of monthly users, 20+ sellers, thousands of SKUs, and ~$5k–$10k monthly throughput;
• Conceived, architected, and delivered a production cross-chain crypto payment system using payment intents, single-use HD-derived holding wallets, chain listeners, event-driven processing via EventBridge/SQS, idempotent state-machine verification, and canonical escrow settlement on Optimism — supporting payments across Ethereum, Arbitrum, Optimism, Polygon, Bitcoin, Mantle, Scroll, and other EVM L2s, with LiFi-based batch replenishment;
• Architected and led development of a live multitenant e-commerce storefront using MedusaJS, NestJS, Next.js, and TypeScript, with wallet-based checkout, NFT-based seller identity, seller admin tooling, full order flow, and AWS/PostgreSQL/Redis/Kubernetes infrastructure;
• Designed and deployed Solidity escrow contracts to Optimism as the canonical settlement layer for the marketplace, with a consent-based release/refund state machine, protocol fees, seller-delegated permissions, and Hats Protocol role model;
• Co-designed the platform's tokenomics architecture, including seller escrow rent, initial seller mint, and dispute-resolution incentive mechanisms;
• Built and owned Kubernetes-based production infrastructure covering backend services, payment listeners, dev/staging/production environments, CI/CD pipelines, monitoring, and alerting.

On-chain financial primitives and a back-office settlement system supporting bond rollover, compounding yield, and bond vault operations for a platform which later became a successful stablecoin.

• Principal architect and founding engineer for Stream Finance's on-chain US Treasury/fixed-income investment protocol — later became the foundation for XUSD, a same-company stablecoin with six-figure financial exposure;
• Architected a modular Solidity suite: core Vault, paired VaultToken, SecurityManager RBAC, optional Whitelist for KYC-gated participation, and DepositVault sweep-in flow — deployed to Ethereum mainnet/testnet with UUPS upgradeability and granular delegated permissions;
• Modeled a full fixed-income lifecycle on-chain: stablecoin deposits, Vault Token issuance, Deposit/Locked/Withdraw phases, sequential rounds, rollover-based compounding, and admin-controlled exchange-rate/yield updates;
• Built multi-layer contract testing: Hardhat unit/integration tests, stochastic random-walk simulations across multiple users and rounds verified against an off-chain profit ledger, Echidna invariant campaigns covering value conservation, admin-role survivability, and proxy upgrade authorization, plus manual penetration testing;
• Architected AWS operational infrastructure: ECS Fargate chain listeners, SQS/Lambda deposit finalization with idempotency, EventBridge/Step Functions lifecycle workflows with mandatory human approval gates before high-risk contract calls, immutable S3 audit logs, production invariant monitors, and SNS/SES alerting.