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Security Engineer

XTX Markets
🇬🇧LondonJuniorFull-timePosted August 13, 2026

About the Role

The Information Security team at XTX Markets is accountable for all aspects of the firm's IT security. In this hands-on role, you will work with software engineers to proactively identify security flaws and engineer technical solutions with a defensive mindset. 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. Security engineers are engaged in requirements gathering, architecting, prototyping, and developing both internal tools and broader infrastructure across a broad range of security roles and projects, including compliance-related tasks.

Requirements

  • Approximately 1-3 years of experience in Information Security
  • Proficiency in at least one statically typed language (development at XTX is primarily in Golang, though Go experience is not required; 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

What You'll Get

  • 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 King's Cross office
  • 25 days paid holiday per year plus statutory holiday and paid sick days
  • Generous pension contributions
  • 4 days per week in the office, 1 day from home