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

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