Network Specialist

2 weeks ago


London, Greater London, United Kingdom Refine Group Full time

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As a Network Expert, you will lead the design and optimization of global trading system network architectures, resolving extreme network complexities to ensure cross-border low-latency trading stability and security. You must possess deep expertise across cloud providers, dedicated lines, and security domains while providing technical leadership to the team.

Job Responsibilities:

  • Global Network Architecture Design & Optimization:

    • Design multi-region Active-Active trading architectures using AWS Transit Gateway and Direct Connect, ensuring cross-region failover with ≤3ms latency.

    • Implement Traffic Engineering to bypass congested international ISP nodes (e.g., Telia, NTT) and optimize Tokyo-London-New York trading paths.

    • Integrate third party low-latency dedicated lines with AWS Global Accelerator, dynamically adjusting BGP weights to handle market volatility.
  • Complex Incident Resolution:

    • Lead P0-level incident recovery (e.g., submarine cable outages, route blackholing) using path analysis tools and Wireshark packet capture to achieve MTTR ≤15 minutes.

    • Develop Python/Go automation scripts to trigger failover to backup links when packet loss exceeds 0.1%, preventing trading cascades.

    • Conduct simulated cross-border network failure drills to validate redundancy and refine SOPs.
  • Security & Compliance:

    • Build Zero Trust Architecture with AWS Network Firewall and Calico policies to isolate core trading zones from public services.

    • Design DDoS mitigation strategies leveraging AWS Shield Advanced and Third party's global scrubbing centres to withstand > 1 Tbps attacks.

    • Ensure GDPR/MAS TRM compliance by auditing cross-border data flows via VPC Flow Logs and generating compliance reports.
  • Emerging Technology Adoption:

    • Explore SRv6, Segment Routing, and FPGA-accelerated TCP/IP stacks to reduce latency and dependency on dedicated lines.

Job Requirements:

  • Minimum 8 years in network architecture, with 5 years focused on low-latency financial systems (e.g., crypto/FX HFT platforms).
  • Experienced in leading at least 3 cross-border trading system migrations and resolved complex outages (e.g., BGP route flapping).
  • Mastery of AWS networking (Transit Gateway, Direct Connect, VPC Flow Logs) and dedicated line optimization.
  • Proficient in path diagnostics, global node monitoring and packet-level analysis.
  • Python/Go scripting for BGP automation and traffic engineering.
  • Certifications: AWS Certified Advanced Networking - Specialty (required), CCIE Enterprise Infrastructure/JNCIE-SP (carrier-grade networking), CISSP/CISM (preferred for security compliance).

Why Join Us?

  • Innovative Projects: Work on cutting-edge projects that make a real difference.
  • Collaborative Environment: Be part of a team that values collaboration and creativity.
  • Professional Growth: Access to ongoing training and development opportunities.
  • Dynamic Culture: Enjoy a vibrant and inclusive workplace culture.

Ready to make your mark? Apply now and become an integral part of our innovative and dynamic team

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