Senior Network Engineer - PTP Services, Low Latency Connectivity & Cyber Security

We are seeking a Senior Network Engineer to help evolve and protect our global timing network infrastructure. This role plays a critical part in ensuring ultra-low latency delivery, accurate time synchronisation, and robust cybersecurity.

What You'll Do

Time Synchronisation

• Deploy and support PTP (IEEE 1588), NTP, and emerging standards such as White Rabbit.
• Work with GPS/GNSS, PPS, LEO satellite sources, and national time authorities.
• Configure and troubleshoot PTP grandmaster, boundary, and transparent clocks.

Core Network Engineering

• Build and maintain low-latency L2/L3 networks across global environments.
• Configure high-performance switching platforms (Cisco Nexus).
• Maintain Cisco Firepower (FMC / FTD) for secure, scalable operations.
• Configure IPSec tunnels and secure communication protocols.
• Produce high-quality technical documentation.

Cyber Security & Risk

• Manage IDS/IPS systems and lead threat detection/response efforts.
• Conduct vulnerability assessments, patching, and penetration test coordination.
• Support ISO27001/ISO9001 compliance and governance activities.
• Participate in incident response, recovery, and continuity planning.

Collaboration & Support

• Work cross-functionally with Software, Systems, and Project teams.
• Provide expert troubleshooting and participate in an on-call rotation.
• Monitor latency, performance, and security using advanced tools.
• Contribute to continuous improvement through learning and innovation.

Do you have experience in Salesforce?, * 5-10 years' experience in mission-critical or low-latency network environments (finance, telco, MSP, defence).

• Degree in Computer Science, Networking, Cyber Security, or related field (or equivalent experience).
• Cisco CCNP/CCIE (Security or Enterprise) strongly preferred.
• Proven experience delivering NTP/PTP services.
• Strong low-latency L2/L3 expertise (STP/RSTP/LACP, OSPF, BGP).
• Multicast experience (IGMP, PIM-SM/SSM, MSDP).
• Strong Linux CLI + networking tools (tcpdump, wireshark, nmap).
• Experience with Cisco Nexus & Firepower.
• Excellent problem-solving and communication skills.
• Ability to work under pressure and support global operations.
• Right to live and work in the UK.

Bonus Experience

• Network automation (Python, scripting).
• AWS/GCP networking exposure.
• Familiarity with White Rabbit timing networks.

• Competitive salary + benefits (including EMI share options & private medical).
• 25 days holiday + company Christmas shutdown.
• Hybrid working in Shoreditch FinTech hub.
• Training, certification support, and continuous learning opportunities.
• Work with cutting-edge technology in global, high-impact environments.
• Dog-friendly office, social events, and innovative community culture.

Hoptroff is a leading provider of ultra-precise timing solutions for finance, telecommunications, and other high-performance industries. We deliver accurate, resilient, and secure timekeeping services to organisations operating in mission-critical, compliance-driven environments.