Software Developer - Infrastructure

The Firm

XTX Markets is a leading algorithmic trading firm which uses state-of-the-art machine learning technology to produce price forecasts for over 50,000 financial instruments across equities, fixed income, currencies, commodities and crypto. It uses those forecasts to trade on exchanges and alternative trading venues, and to offer differentiated liquidity directly to clients worldwide. The firm trades over $250bn a day across 35 countries and has over 250 employees based in London, Singapore, New York, Paris, Bristol, Mumbai, Yerevan and Kajaani.

We leverage the talent of the people who work here, modern computational techniques and state-of-the-art research infrastructure to analyse large data sets across markets quickly and efficiently, to maximize the effectiveness of our proprietary trading algorithms. We are actively seeking new methods and ideas. The models that drive our trading strategies have evolved considerably over the last 10 years, from econometric methods that gave our company its name, to trees, to neural networks, to modern deep learning architectures.

XTX Markets has an unrivalled level of computational resources in the trading industry, with a growing research cluster currently containing over 25,000 GPUs with 650 petabytes of usable storage. Teams across the firm include world-class researchers with backgrounds in pure math, programming, physics, computer science and machine learning. The firm is also constructing a large-scale data centre in Finland to future-proof its significant computational capabilities.

At XTX Markets technology is our business and we are a diverse organization which attracts outstanding talent from across all industry backgrounds. We are focused on teamwork and our people collaborate on all aspects of the business, working openly and with respect for each other, our clients and the market. Our culture is non-hierarchical and one where everyone is valued. We strive for excellence in everything we do.

The Role 

The Shared Engineering team at XTX Markets develops and maintains the systems and infrastructure that form the backbone of our organization. We design robust tools and services that enable trading, research, and back-office teams to operate seamlessly and efficiently with minimal disruption.

We are looking for a software developer to join our team as part of a planned expansion. In this diverse and hands-on role, you will design, build, and enhance custom-built systems and tools tailored to the needs of the organisation.

You can expect to work on a wide variety of impactful projects, all of which are used by other teams, such as:

• Job Scheduling: Develop our in-house solution to manage workflows and batch jobs.
• Monitoring and Alerting: Improve systems that notify teams about issues in production environments.
• Network Automation: Create tools to automate network configuration and management.
• Security Infrastructure: Build and maintain AAA platforms, proxies, and our custom secure Linux distribution.
• Linux Build Systems: Contribute to the development of our general-purpose Linux build and management infrastructure.
• Asset Database: Enhance the system used to manage costs and inventory across key departments like Procurement, Finance, and Datacentre Operations.
• Developer Experience: Improve workflows for the company monorepo, build systems, and deployment pipelines to optimize developer productivity.
• Self-Service Tools: Design reliable and efficient systems to manage the services provided by diverse technologies, including network filesystems, packet captures, client onboarding processes, and more.

In addition to software development, you’ll also participate in an on-call rotation (approximately half a week every five weeks) to support all services the team provides.

This is not a Linux sysadmin, SRE, or network engineering position (we already have this expertise within the team), but having a solid foundation and interest in these domains is crucial.

If you enjoy solving problems with clean, well-understood technology, we’d love to hear from you.

Essential Attributes

To succeed in this role, you should have:

• • Fluency in a programming language such as Go (preferred), Python, Java, or C++.
  • Competence with Bash and C.
  • Expertise in development tools and techniques, including git, IDEs, and CI/CD processes.
  • Proven experience creating self-service tools or automation that made a positive impact and were widely adopted by users.
  • Strong knowledge of Linux system administration and host-level TCP/IP networking. Comfort with debugging operating system issues and working at the command line is essential.

Desirable Attributes 

Experience with the following technologies would be a great addition but is not required:

• Familiarity with TypeScript, React, or basic HTML for web development.
• Exposure to containerization and virtualization tools like Docker, Podman, or KVM.
• Experience with configuration management tools like Terraform, Bash, or Python scripts.
• Knowledge of networking concepts like STP, BGP, OSPF, and multicast routing.
• Understanding of counterparty connectivity and other trading infrastructure.

Benefits

• Onsite gym, sauna, and fitness classes at no charge.
• Extensive medical benefits including an on-site doctor and therapist at no charge.
• Breakfast and lunch provided daily.
• Various supports for caregivers, including emergency dependent care.
• Beautiful Kings Cross office: https://vimeo.com/257888726
• 25 days paid holiday per year + statutory holiday and paid sick days.
• Generous Pension contributions.
• We work 4 days per week in the office, 1 from home unless stated otherwise.