Security Engineer


XTX Markets is an algorithmic trading firm that actively trades tens of thousands of instruments on over eighty venues with a daily volume of almost three hundred billion USD. We partner with counterparties, exchanges, and e-trading venues globally to provide consistent liquidity in the Equity, FX, Fixed Income, Commodity & Options markets, helping market participants throughout the world obtain the best prices in the various assets classes we cover.

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 maximise the effectiveness of our proprietary trading algorithms. 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. We are actively seeking new methods and ideas.

At XTX Markets technology is our business and we are a diverse organisation 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 Information Security team at XTX Markets is accountable for all aspects of the firm’s physical and IT security.  From obtaining and transforming events and signals into actionable intelligence, to helping design and implement authentication and authorisation systems, and other security tools that underpin the XTX environment.

The team also assess third party security, as well as working diligently to keep XTX in compliance with a range of world-wide regulatory information security requirements.

Our Security team works to create and maintain the safest operating environment for XTX Markets users and developers. In this role, you will work with software engineers to proactively identify security flaws and engineer technical solutions to a defensive mindset.

This is a hands-on role.  XTX prides itself on its ability to create and maintain software and systems that precisely meet our needs.

As XTX Markets' handle information at a large scale and across multiple locations, we need to anticipate and protect against attackers. You will work closely with teams to improve our detection capabilities, and to design defence-in-depth controls that limit attackers' ability to move inside our network.


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

The successful candidate will be expected to work across a broad range of security roles and projects, including compliance related tasks as well as the analysis of third-party software and services.


  • A solid grounding in academic computer science with a broad and deep exposure to system level programming.
  • A successful track record of architecting, developing, and deploying large scale security solutions, rather than relying on vendor products.
  • Approximately five to seven years’ experience in Information Security.
  • Proficiency in at least one statically typed language; development at XTX is primarily in Golang, though previous experience in Go is not a pre-requisite.  Scripting is mainly in Python.
  • Deep familiarity with UNIX and Windows authentication systems with system-level knowledge of other areas a plus
  • 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.


  • Cryptography experience, including the analysis of the properties of cryptographic systems.
  • Some OS development experience either Kernel or Userland.
  • Familiarity with Kerberos and related authentication technologies.


  • 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:
  • 25 days paid holiday per year + statutory holiday and paid sick days.
  • Generous pension contributions.