J. Spencer Greene, an expert on exchange infrastructure, market microstructure, crypto trading

Mr. Greene brings a wealth of financial expertise coupled with 30+ years of commercial software experience. His deep knowledge of trading, exchanges, investment, and commercial banks has directly benefited many of the world’s top financial institutions. An early proponent of cryptocurrencies, he is frequently called upon to discuss not only technology and architecture but also the business, regulatory, and sovereignty issues that face modern financial markets.

He has managed the development of NASDAQ Europe, multiple derivative execution venues and various program and algorithmic trading systems. He has advised more than 30 of the largest global exchanges on issues ranging from technology’s role in market microstructure to business and regulatory trends. He has worked extensively on-site with global liquidity venues and market makers on optimizing their next-generation enterprise architectures, from latency reduction to increased cyber security.

Mr. Greene currently runs Joompi Capital Management, a family office / hedge fund dedicated to automated trading strategies.

An avid C++ developer, Mr. Greene designed and implemented an algorithm based on a modified GARCH process with custom liquidity calculations (using depth, immediacy, resiliency, transparency, priceability, and fungibility).

Areas of expertise

Exchanges/Liquidity Venues

  • System Architecture
  • Low-Latency
  • Network Design
  • Fault Tolerance
  • Disaster Recovery
  • Market Data Distribution
  • Pricing Algorithms
  • Clearing and Settlement
  • Market Risk/Surveillance
  • Margin Calculations

Distributed Systems/Architecture

  • Exchanges
  • Trading Systems
  • Proprietary Trading
  • Feed Handlers
  • Order Routing
  • Trading/Matching Engines
  • Market Making
  • Cloud/Hybrid Infrastructure
  • Database Design

Crypto Trading

  • System Architecture
  • Decentralized and Distributed Ledgers
  • Blockchain Platforms
  • Enterprise Business Processes


Litigation support

Mr. Greene’s services are available to attorneys representing plaintiff and defendant and include consulting, written reports, deposition, arbitration, and trial testimony as needed.


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