DeFi Security Engineer - HFT Market Making Firm - London

Our client is a leading Crypto Market Making firm in Algorithmic and Systematic Trading. They are currently seeking a DeFi Security Engineer for their London office. This role focuses on supporting the security of their Crypto trading infrastructure and OTC platform Read on to find out what you will need to succeed in this position, including skills, qualifications, and experience.

Responsibilities:

• Conduct vulnerability assessments, threat modeling, and penetration testing across infrastructure, smart contracts, and OTC-specific components
• Lead system hardening, network segmentation, identity management, and rapid incident response for DeFi and OTC environments
• Investigate security incidents and perform forensic analysis, particularly for OTC-related exploits like private key leaks or settlement disputes
• Design and implement security controls for Linux-based trading systems, DeFi protocols, and OTC platforms handling large-scale, private crypto trades
• Collaborate with developers to embed security best practices in code, CI/CD pipelines, containerized environments, and OTC deal workflows

Requirements:

• Bachelor's degree in Computer Science or other related disciplines
• Over 5 years of experience in security engineering
• Strong understanding of network security, firewall and VPNs
• Experience in scripting and automation skills in Python, Bash, or Ansible
• Knowledge of crypto-specific attack surfaces — exchange API security, private key management, and wallet infrastructure
• Fluent in English

To Apply:

If you are interested in this role, please send us your CV or call us on +852 3619 9860 for a confidential chat