Security Engineer

The Firm

XTX Markets is a leading algorithmic trading firm using state-of-the-art machine learning technology to produce price forecasts for over 53,000 financial instruments across equities, fixed income, currencies, commodities, and crypto. It uses these 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 300 employees based in London, Singapore, New York, Paris, Bristol, Mumbai, Yerevan, and Kajaani.

XTX Markets leverages the talent of its people, modern computational techniques, and state-of-the-art research infrastructure to analyse large data sets across markets quickly and efficiently, maximizing the effectiveness of its proprietary trading algorithms. The models driving trading strategies have evolved considerably over the last 10 years, from econometric methods to trees, neural networks, and modern deep learning architectures.

XTX Markets has an unrivalled level of computational resources in the trading industry, with a growing research cluster currently containing well over 25,000 GPUs with more than 1 exabyte of usable storage. Teams across the firm include world-class researchers, developers, and technologists 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 computational capabilities.

At XTX Markets, technology is the business. The firm is diverse, non-hierarchical, and focused on teamwork—people collaborate openly and with respect for each other, clients, and the market. Everyone is valued, and the organization strives for excellence.

The Role

The Information Security team at XTX Markets is accountable for all aspects of the firm’s IT security. This includes obtaining and transforming events and signals into actionable intelligence, helping design and implement authentication and authorisation systems, and building other security tools that underpin the XTX environment.

The team also assesses third-party security and works to keep XTX in compliance with a range of worldwide regulatory information security requirements.

This is a hands-on role focused on creating and maintaining the safest operating environment for XTX Markets users and developers. In this position, you will work with software engineers to proactively identify security flaws and engineer technical solutions with a defensive mindset.

Because XTX handles information at scale across multiple locations, you will help anticipate and protect against attackers. You will work closely with teams to improve detection capabilities and design defence-in-depth controls that limit attackers’ ability to move inside the network.

Responsibilities

At XTX, security engineers are engaged in requirements gathering, architecting, prototyping, and developing internal tools and broader infrastructure in conjunction with partner teams around XTX.

The successful candidate will work across a broad range of security roles and projects, including compliance-related tasks.

Essential Attributes

• Approximately one to three years’ experience in Information Security.
• Proficiency in at least one statically typed language. Development at XTX is primarily in Golang (previous Go experience is not a pre-requisite). Scripting is mainly in Python.
• Knowledge of how systems are built as well as how to break them.
• Strong communication and interpersonal skills.
• Able to write clearly and succinctly.
• Rapid learner with strong attention to detail.
• Able to work autonomously and prioritise as required.
• Willing to admit mistakes and seek feedback to improve performance.

Desirable Attributes

• Personal projects which you can show or talk about.
• Experience playing CTFs.
• Security certifications demonstrating practical ability (e.g., OSCP).

Benefits

• Onsite gym, sauna, and fitness classes at no charge (Wellbeing Space).
• 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 King’s Cross office: Office Tour.
• 25 days paid holiday per year plus statutory holiday and paid sick days.
• Generous pension contributions.
• Work 4 days per week in the office, 1 from home unless stated otherwise.