Group One Trading Tech Stack

Proprietary equity options trading firm with focus on risk management and market-making

Financial Services Chicago, Illinois 51–200 employees Founded 1989 Partnership

Group One is a proprietary trading firm specializing in US equity options market-making. The tech stack is Windows/.NET/C#/Java-heavy with Azure infrastructure, typical of financial services firms built before cloud-native architectures dominated. Current hiring spans compliance, engineering, finance, and support roles across director through intern levels, with active projects centered on compliance framework buildout and regulatory coordination — suggesting either recent regulatory pressure or a scaling push in back-office operations.

Tech Stack 14 technologies

Core Stack.NET C# Java C++ Windows Server Active Directory SQL Server Azure AD Objective-C Windows 10 Windows 11 Azure Exchange Online VMware vSphere

What Group One Trading Is Building

◆Challenges

Managing compliance operations
Vendor management for compliance systems
Balancing regulatory requirements with business practicality
Managing vendor relationships for compliance systems

▲Active Projects

Build compliance framework
Lead cross-departmental initiatives
Coordinate regulatory examinations

Hiring Activity

Steady7 roles · 2 in 30d

Department

Compliance

Engineering

Finance

Support

Seniority

Director

Intern

Junior

Mid

Notable leadership hires: Compliance Director

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About Group One Trading

Group One Trading is a proprietary trading firm headquartered in Chicago that makes markets in US equity options. The firm operates as a partnership and emphasizes superior risk management and software development as competitive edges. With 51–200 employees, the organization appears split between front-office trading/finance roles and growing back-office functions in compliance and engineering. Current hiring velocity is steady, with vacancies across compliance, engineering, finance, and support; leadership gaps are being filled at the director level.

HeadquartersChicago, Illinois

Company Size51–200 employees

Founded1989

Hiring MarketsUnited States

Frequently Asked Questions

What technology stack does Group One Trading use?

Primary languages are C#, Java, and C++; infrastructure runs on .NET with Windows Server/Azure. SQL Server provides database management; VMware vSphere handles virtualization. Active Directory and Azure AD manage identity.

Is Group One Trading hiring compliance staff?

Yes — 2 compliance roles are open across director and junior levels. Compliance buildout is a stated active project area.

Where is Group One Trading headquartered?

Chicago, Illinois. All current hiring is within the United States.