Jane Street Tech Stack

Quantitative trading firm operating globally across equities and derivatives

Financial Services New York, NY 1,001–5,000 employees Founded 2000 Privately Held

Jane Street is a quantitative trading firm founded in 2000 with offices across New York, London, Hong Kong, Singapore, and Amsterdam. The tech stack reveals a classic trading infrastructure: OCaml for core systems, FIX for market connectivity, Linux/Unix underpinning, plus Windows and macOS client environments with standard enterprise tooling (Active Directory, Kerberos, Workload). Active hiring pressure on infrastructure connectivity (exchanges, client onboarding, configuration management, deployment automation) paired with security/detection work suggests the firm is scaling exotic options trading and managing the operational complexity of expanding to new venues.

Tech Stack 29 technologies

Core StackCisco Linux Python Workday Windows Server C# Active Directory OCaml Dell Arista Ciena Bash Excel SQL Word Google Workspace Unix C gdb eBPF FIX Windows 10 Windows 11 PowerShell Kerberos DNS Group Policy Windows macOS

AdoptingOCaml

What Jane Street Is Building

◆Challenges

Increasingly competitive market
Overall workload
Onboarding external clients
Connecting to new exchanges
Streamlining connectivity processes
Balancing security controls and business requirements
Missing flow access
Expanding exotic options trading capabilities
High error rate
Automation and efficiencies

▲Active Projects

Campus recruiting initiatives
Improving creative sourcing methods
Internship program execution
Recruiting events coordination
Improving detection capabilities
Model development
Strategic positioning
Threat hunts
Scalable configuration management
Deployment automation

Hiring Activity

Steady65 roles · 25 in 30d

Department

Finance

Engineering

Legal

Security

Data

Research

Sales

Seniority

Senior

Mid

Junior

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About Jane Street

Jane Street is a quantitative trading firm with a 20+ year operating history, operating proprietary trading strategies across equities, fixed income, options, and crypto. The firm employs 1,001–5,000 people across five continents. The company does not serve retail investors; all activity is institutional and counterparty-facing. Internally, the organization runs a heavy recruiting and talent-development program—campus recruiting initiatives, internship execution, and recruiting events are active projects—reflecting an engineering and research-intensive culture. Current operational focus includes expanding exotic options trading, improving detection and monitoring capabilities, and resolving connectivity and onboarding bottlenecks with new exchanges and clients.

HeadquartersNew York, NY

Company Size1,001–5,000 employees

Founded2000

Hiring MarketsCanada, China, Singapore, United Kingdom

Frequently Asked Questions

What programming languages does Jane Street use?

OCaml is the primary systems language. Python, C, and C# also feature in the stack, alongside Bash and PowerShell for automation. Unix/Linux and Windows Server form the infrastructure base.

What are Jane Street's current operational challenges?

Key pain points include connectivity and onboarding complexity with new exchanges, high error rates in trading operations, automation gaps, and balancing security controls with business velocity. The firm is also managing workload and competitive pressure in the trading market.