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At Harmonai, we build automated intelligence for disciplined quantitative trading. We are a team of quants, engineers, and operators working together to develop systematic quantitative trading capabilities through quantitative research, engineering, automation, risk management, and operational discipline. Our focus is to build complete decision systems: from data and models to execution, controls, documentation, and the learning cycles that allow systems to improve over time. We operate in markets that are increasingly automated, fast, and competitive. In that environment, we believe sustainable advantage depends on the ability to build systems that learn, adapt, and operate with rigor. At Harmonai, automation is a core capability. We build technology and infrastructure designed to increase precision, improve resilience, reduce fragility, and support long-term scalability. Our culture is grounded in truth-seeking, discipline, and ownership. We value people who think clearly, communicate directly, care deeply about their craft, and approach problems with curiosity, responsibility, and intellectual honesty. Many of the people building Harmonai have previously founded or helped build companies, systems, and technical infrastructure. That experience shapes how we think, collaborate, and operate day to day. We are building an organization that is technical, deliberate, highly capable, and deeply focused on compounding systems, knowledge, and capability over time.

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Stephen McNulty is the Chief Operating Officer and Co-Founder of Harmonai.

2 people are employed at Harmonai.

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