Security Engineer
XTX Markets is a London-headquartered algorithmic trading and electronic market-making firm using machine learning to forecast prices across equities, fixed income, currencies, commodities and crypto, then trading on venues and providing differentiated liquidity to institutional clients.
Maintainer signals as of 9/25/2026
About XTX Markets
XTX Markets operates as a quantitative electronic market maker and institutional liquidity provider. Its technology produces price forecasts for more than 53,000 financial instruments, which it uses to trade on exchanges and alternative venues and provide customised, low-market-impact liquidity. The group also operates XTX Ventures and open-sources technology such as TernFS.
Skills
Candidate Availability
Required and preferred rules are kept separate and reflect the wording in the original posting.
About the Role
You will work across information security projects, gathering requirements, architecting and developing internal tools and infrastructure. You will proactively identify security flaws with software engineers, improve detection capabilities, and design defence-in-depth controls that limit attackers’ movement inside the network. You will also contribute to third-party security assessments and regulatory compliance activities.
Requirements
- Approximately one to three years’ experience in information security
- Proficiency in at least one statically typed language
- Knowledge of how systems are built and how to break them
- Strong communication and interpersonal skills
- Ability to write clearly and succinctly
- Strong attention to detail
- Ability to work autonomously and prioritise tasks
- Personal projects are desirable
- CTF experience is desirable
- Practical security certifications such as OSCP are desirable
Responsibilities
- Gather requirements for security projects
- Architect and prototype internal tools and infrastructure
- Develop internal tools and broader infrastructure with partner teams
- Proactively identify security flaws with software engineers
- Engineer technical defensive solutions
- Improve security detection capabilities
- Design defence-in-depth controls
- Assess third-party security
- Support information security compliance activities
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
- Emergency dependent care and other caregiver support
- 25 days paid holiday per year plus statutory holiday and paid sick days
- Generous pension contributions
- Four days per week in the office and one day from home