I’m John McCallum, founder of JM4C Software Solutions & Consulting, where I develop production-ready software solutions and provide specialized consulting across the fintech and trading technology ecosystem.
With over 15 years of experience at leading retail trading and brokerage platforms, I focus on the complex systems that enable margin, equities, options, and futures trading — the parts of the stack where precision, compliance, and reliability matter most.
Whether you’re building new infrastructure, enhancing existing systems, or navigating regulatory and operational challenges, JM4C provides both the tools and the expert guidance to move from concept to execution.
Ready-to-deploy trading and risk management software built for production use. Tools for margin and buying power calculations, options pairing, and "what-if" analysis—built to integrate directly into your platform and accelerate development.
Specialized expertise across trading operations, risk frameworks, and product design. I help fintech teams design, refine, and implement complex systems that balance innovation, compliance, and scalability.